Toyota L Weak and Overheating Engine-Newly Overhauled

We have overhauled a Toyota L engine just this week and came to a puzzling issue on why it lost its power and is overheating.

Prior to overhauling the engine had overheated due to the radiator hose bursting.  It was immediately addressed during that day and everything was fixed and we used the car onto the occasion we went through.

However, after going back home the owner noticed that the coolant was being mixed with oil. The oil cooler gasket was replaced and to make sure everything was fine the cylinder head gasket was also replaced. Those steps did not solve the issue, the more the car emits thick white smoke.

This time the owner decided to let the engine overhauled.

The car was brought to the mechanic and the engine disassembled. Noticeably, the four cylinders were having the same uneven and marked sides.

The mechanic recommended that the cylinders be replaced with a standard size or oversize it with a 0.50mm.

The owner happened to decide on the 0.50 sleeves be oversized. He brought the block to the Machine Shop for oversizing and went ahead and bought all the 0.50 piston, piston rings.

Weak and Overheating Engine-Newly Overhauled-0.50 size piston

After one day he went back to the Machine Shop because he was called to decide on what will they do. On the image below they have shown the owner that the sleeve has a crack around near the top and they don’t recommend it for oversizing rather it should be replaced with a standard.

Weak and Overheating Engine-Newly Overhauled-oversize cylinder

Since he bought all the oversize piston and piston rings through an order, it cannot be returned and the only remedy is to buy a standard sleeve then oversize it. It was an unexpected additional expense, however, the parts have to be utilized and no other choice.


The four standard sleeves were rebored and honed

After these sleeves were rebored and honed the engine is ready to be assembled. With new overhauling gasket, it includes the cylinder head gasket, the oil cooler gasket, new crankshaft oil seal, new camshaft oil seal, new cylinder head cover gasket, new crankcase cover gasket and others. New sets of 0.50 sleeves, 0.50 piston, and piston rings.

The engine assembled with a new look, freshly cleaned inside and outside.

The engine attached to the body and the new engine life is first started successfully.  The sound is fine enough and you are contented with what you have done. The noise is just fine and it needs breaking-in for hours before it is normally used again for services anywhere.

Road Testing

After one day we tested it on the road and upon climbing up the hill there was no power even to the first gear.  It could just move on a plane lane and when you forced it to an elevated road it overheats and stalls.

The coolants are obviously circulating both oil and water that clearly puts impression that the coolant pump is working fine.

This is the first time I experienced a newly overhauled engine with no power.  It’s a puzzle I and the mechanic have to discover.

I wish my readers could help in the solution of the issue at hand.  Please kindly post your comments down below the comment box.

What do you think is the reason behind why this engine has no power instead of a renewed strength and life? What steps and solutions should be done to restore this engine to its power?





Cylinder Liner-Cylinder Sleeve Issues

The image below is called a cylinder liner or a cylinder sleeve.  This auto part is inserted into the engine block. In other engines, there are no cylinder liner or cylinder sleeve, they only have cylinders directly part of the block.

The cylinder liner is where the piston goes up and down for intake and exhaust system. This is directly lubricated by the engine oil.  In order for the oil not to be mixed with the fuel, a piston ring is needed to seal the space between the piston and cylinder liner or cylinder sleeve for better compression and avoid overheating in the engine.

When the piston ring or the cylinder liner is perforated oil will be pushed up into the fuel chamber and it will be mixed making a bluish smoke emitted by the engine.

In many cases, if signs are obvious there is a need for the piston rings to be replaced for proper engine oil sealing.

Cylinder Liner-Cylinder Sleeve Issues-cylinder sleeve

However, if the cylinder liner has already scratches which the piston rings cannot seal, the cylinder liner has to be replaced, it can be oversized from the standard measurement to 0.25mm or to 0.50mm.

If cylinder or cylinder liner is necessary for oversizing piston and piston rings should also be replaced with 0.25mm to 0.50mm.

However, others opt not to replace the piston but only the piston rings for practicality reason. If your car is not for racing they don’t advice you to replace the piston but only the piston rings.

Oversizing the cylinder liner, piston and piston rings has started with the myth of having a larger size other than the normal one is stronger and faster you can take advantage of.

So make a choice if you are the owner of the car. If you are in a race and you believe on the myth of oversized cylinder liner then you do.  Because this will surely be the advice of the persons who work in the Machine Shops.

However, if you use your car for family services and necessities you may just have the piston rings to be replaced with an oversized one.


Cylinder Liner-Cylinder Sleeve-Inserted into the engine block

The Issue on this Cylinder Sleeve

As you can see from the above image of the cylinder which is about to be oversized, there is a lining around near to the top.  You don’t see a crack but a color pencil like. The serviceman decided not to continue oversizing it until the owner decides for it.

The oversizing is to 0.50mm because of deep scratches made by an unknown cause. For sure even you replace the piston ring it cannot seal the engine oil to go up and be mixed with the fuel.

The mark is far above where the piston ring can reach. It’s a part of the combustion chamber.

Find related issues here on bluish smoke.

Thank you for reading.  I hope it helped you.  Please drop a comment below and I’ll get back to you as soon as I read it.





Circuit Relay Related Issues

Have you had experiences that your car stalled during your journey? It’s difficult to ascertain what could be the cause. This circuit relay issues can be new to you and you need to know about it so you will consider and include it in your diagnoses if ever your car frequently stalls.

You know your battery is in good condition.

You know you have enough fuel.

You know the fuel filter is doing its function effectively.

You might think the injection pump of your car needs to be calibrated.

But wait before you do the laborious and expensive repairs and fixtures, there is one thing you should first check and this is related to electrical issues.

I would like to prove to you what I am saying.  Here goes the story.

For thrice my car has been stalling in the midst and at the crossroads and it was a shameful situation. Isn’t it? I was causing the traffic.  

Because the engine can be cranked but cannot be started we have to push it and after doing so the engine finds its way to start over again.  

There was a time that along the way I have to call for a mechanic to see what was faulty. But as it was a joke the engine started and we got home but after several days it sometimes starts and sometimes it doesn’t.

At this point in time, I called my friend mechanic to once and for all diagnose the issue causing the inconveniences along the way.

We started the engine and as he inspects every angle he happened to bump on the electrical circuit and the engine stopped.

Circuit relay issues-circuit relayWhy Engine Stalls When Hot or During Long Trips-worn out contact points-circuit relay

Now we have discovered that the sockets are too loose and when the car is running and the current line is detached it stalls because no current to burn the fuel.

The following images below are the ones installed in my car.  Maybe your car is newer and you have a more advanced circuit relay.

I have to buy a new one and changed this old circuit relay.

Circuit relay issues-circuit relay

Circuit relay issues-circuit relay


What does this circuit relay do?

This circuit relay controls the electrical flow from the battery to the fuel control valve.  If electrical fails due to a defective circuit relay the fuel control valve doesn’t do anything and the fuel will not flow to the fuel injection pump.

Circuit Relay Issues- Fuel Control Valve

Fuel Control Valve

Although there are some fuel passages that supply the injection pump since there is no current nothing can ignite the fuel in the combustion chamber.

For sure your engine is being cranked but it will not start.



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Oblong Rear Tire Can Seriously Deceive You

I have been deceived for almost two months until I have discovered that the problem does not lie on the engine nor on the transmission but something else.  Watch the video before you continue to read what I would like to share with you this time.

The first time I felt as if the break was not evenly fitted or something wrong in the transmission.  I paid time to check the brakes but they were in proper positions.

Not sure of what is the problem all about we continually used the vehicle.  But as time went on the more eminent the disturbing sound and shaking especially when loaded.

I had to look for a mechanic and since there’s evident sound coming from the differential I decided that it be fixed.  However, we have already fixed the problem in the differential but that shaking remained.

I consulted another technician and we even tested and he said, maybe it’s the clutch.  I inquired if how much would be the expenses if ever his suspect is right.  He answered, maybe you will spend a maximum of five thousand pesos.

Because I don’t have that amount I did not let it be disassembled. A week passed and I was still using the vehicle for church work not so far so it would not incur much difficulty if ever it stalls.

This time I went to our friend and fellow church member and a mechanic.  We rode the vehicle and drove along the highway. After around three kilometers we stopped on a safe place along the highway and jacked the rear tire one after the other.

As per instruction of the mechanic I started the engine and let the tire rotate.  The right rear tire was not rotating smoothly but the left rear tire was still good.

It’s not a problem of the wheel but the tire that is already oblong.  As you have viewed on the video above the rotation is not normal.

Because the mechanic said that the tire should be replaced I have to do so.  I had to look for tire center and it caused me eighteen kilometers to have it replaced. Not only one tire but both because the problem might be repeated.

It cost me more than seven thousand pesos but it solved the problem.  We went home with joy and satisfaction that our expenditures went to the right thing.

It’s really deceiving because in my own impression the tires are still new because the grids are still deep and didn’t show a serious and impending ware and tear problems.

Now I know that you cannot judge a book by its cover.  Although the tire appears to be durable the six years speak that it’s time to be replaced.

Now it’s safer ever again and you can be calm as you drive anywhere. Thanks to the mechanic.




Reasons Why You Need an Engine Overhaul

Overhauling an engine is an expensive process which to any car owner is undesirable.  

This is what you expect when you bring your engine into a shop for overhauling. Calculated in pesos, the Philippine currency.

P5,000   Service fee for the mechanic;

P12,000 Machine shop repair and service fee, this includes

  • cylinder head resurface
  • cylinder honing
  • cylinder sleeving
  • main journal regrind
  • connecting rod journal regrind
  • connecting rod fitting/conversion
  • connecting rod bushing hydro bore honing
  • main housing and caps line boring
  • valve refacing
  • valve guide replace
  • valve seat ring insert
  • turbo blast degreasing
  • and oil seal build up

P13,500 Cost of parts to be bought includes:

  • a set of overhauling gasket
  • a set of piston rings
  • a set of connecting rod standard bearings
  • standard main bearing
  • set of liners and a crankshaft

P27,000 Total expenses.  This is not a joke.

Is there anyone of you there can offer a cheaper service?


Reasons for a Need of an Engine Overhaul-Toyota L Engine overhaul

Reasons why a Need for an Engine Overhaul

1.  Bluish white Smoke-this is sometimes called blue-gray-smoke.  It is a symptom that there is oil leakage and is being mixed in the combustion chamber.  Oil maybe passing through the valve, or through the head gasket.  It may also be through the worn piston rings or perforated sleeves.  The worst thing is the block has a crack but this is very rare. If this bluish white smoke appears it is necessary to have an overhaul.

What is to be done?
If you are sure of what the causes are especially if they are obvious it would be easier for you.  But if you are not sure you need the following to be done: 

  • valve replacement
  • valve seat replacement
  • valve guide replacement
  • piston ring replacement
  • gasket replacement, and
  • cylinder head resurface.

Hopefully, after administering all those parts replacements the issue should have been resolved.  If the issue remains you have the worst thing and that is an engine block replacement due to a crack.

It is, therefore, best if you bring your engine in a shop for overhaul let the engine block be inspected first to ensure you will not repeat the same task after everything has been done.

Possible Causes that Contributes to the Damages of Parts Mentioned Above

1. Oil Deficit-an often oil deficit in a long trip is definitely a cause to the damage of engine parts like block gasket, valves, valve seats, not so usual with valve guide or valve stem.
Lack of oil will cause engine overheating.

2.  Irregular or a Late Oil Change-this has something to do with oil viscosity.  If oil is already viscous before you change it adds to the high temperature of the engine.

3.  Lack of Coolant-this is why water as coolant is very important on every journey. Be sure to inspect your radiator if it has sufficient water. Lack of water causes engine overheating.

All of these oil deficit, irregular or a late oil change, and lack of coolant are causes of engine overheating that can melt the block gasket even the valves and valve seats.  It could even result in sleeve perforations and the worst thing the block cracking.

Why not attend to the symptoms and address it immediately than to wait and incur a four hundred times of expenses and much time spent.




Diesel Injector Nozzle Calibration

Diesel injector nozzle calibration is necessary when your car is an old model which had been used for decades because parts have passed through heat over time and may have weakened, or have perforations.

Diesel injector nozzle calibration-injector

This service is also needed in modern cars which are digitally equipped but may have encountered fault in a program that feeds the wrong message to parts that perform the measurement of the right amount of fuel for the engine.

Why calibrate injectors?
A fuel injector is an assembly or group of parts assembled and otherwise called a nozzle. Sometimes the whole thing is called nozzle and the end part of the injector where the fuel comes out is also called nozzle.

The function of the injector is to control the flow of fuel through the injection nozzle to the combustion chamber.

On the passage of time, one of the parts may have weakened or had perforations and for that reason, the right amount of fuel to be supplied to each cylinder is no longer normal causing more emission of smoke undesirably affecting anyone around.

The primary reason why injectors are calibrated is to bring it back to the original pressure that supplies the right amount of fuel to the cylinder for efficient performance.

How is Calibration Done?
This should be done by professional technician unless you have the devices to use and you know the proper pressure.

The reason is that calibration is not just cleaning the injectors but it is to check the pressure and if it is not in the desired one it should be put back to the original pressures.

Why has the pressure possibly changed?  There are two reasons that contribute to this state, the nozzle spring and the injection nozzle.

Diesel injector nozzle calibration-nozzle spring

Diesel Injector Nozzle Calibration-Nozzle

As I have said there are parts that may in due time weakens or perforated because of heat.

If the nozzle spring has weakened the pressure has loosened and more fuel is sprayed to the cylinder.  The remedy is to change the shims to a thicker to add pressure to the spring.

If there are perforations on the nozzle or the nozzle needle there is no other remedy than to replace the injector. You cannot control the flow of the fuel by adding shims to add pressure to the spring.


Disassembled Diesel Injector

Diesel injector nozzle calibration-disassembled injectorDiesel injector nozzle calibration-disassembled injectorDiesel injector nozzle calibration-disassembled injectorDiesel injector nozzle calibration-nozzle cleaning

Possible Symptoms when Diesel Injector needs calibration

Black smoke-this is a sign that fuel is over to the limit needed by the engine for combustion.  Not all fuel is being burned and so it is wasted and emitted outside. If smoke is white oil is passing somewhere the cylinder or cylinder head gasket and is mixed with the fuel in the combustion chamber.


The Nozzle Tested on a Pressure Guage of 125 Pounds Per Square Inch (PSI)

Rough Engine Idle

Assuming that you have fixed all the proper idle speed, no vacuum leaks, no damaged or incorrect spark plug gaps (for the four-stroke engines), you have calibrated your fuel injection pump but the idle is still rough it’s time for you to have your fuel injector calibrated.




Three Types of Tires Exposed

Three types of tires exposed. I say exposed because in this lesson we are going to identify the types of tires according how they are made and how they will fit what you need for your car.

I thought when buying tires you just buy what you want but I come to realize that it’s not. In buying tires for your car there are considerations to think about and this is what I would like to expose and share with you this time.

When you buy your next set of tires, choosing the type of tire is very important.  You have to consider the following:

1) kind of driving you do
2) the maximum number of passengers you carry
3) heaviest cargo you carry
4) safety
5) tread life
6) appearance

Three Basic Types of Tires

1.  Bias-ply tires

a. they are the oldest type
b. less expensive
c. emits noised when driving
d. runs hotter at high speeds
e. less cornering ability
f.  satisfactory fuel economy
g. sufficient handling

Choosing Tire Type-Car Needs Bias ply tire

Bias Ply Tire


2.  Bias-belted tires

a.  lasts longer than bias-ply
b.  emits less noise when driving
c.  runs hotter at high speeds
d. less cornering ability
e. sufficient fuel economy
f.  sufficient handling

Choosing Tire Type-Car Needs Belted bias ply tire

Belted bias ply tire

3.  Radial tires

a.  longer tread life
b.  best handling
c. riding quality is superior
d. high-speed capacity
e. runs quieter
f.  reduced rolling resistance because of the belt
g. improved traction
h. resistance to cuts by glass, sharp metal objects, and other road hazards

Choosing Tire Type-Car Needs Radial Tire

Difference between bias ply tire and radial tire rotation

Choosing Tire Type-Car Needs Tire Rotation


Now, these are all images of cut tires to expose what is inside it. When you are going to buy there is no way you can determine these.  What would you do so you can buy your preferences on the tires type? 

The best thing is to ask the dealer regarding the type of tire you need.  Dealers are knowledgeable about the products they are selling because they are oriented to it.  That’s the very first thing we should do, to inquire about what we need and if they don’t know find another dealer that could give us the specific details of what we need.



Fixing Rear Differential Problems

We are going to work and spend our time in fixing rear differential problems. But before we start our work today let’s assure ourselves of what is happening? What problems are we going to address?  How do we know that the problem is in the differential?

The following symptoms could make us decide that it is a differential problem.

First, a roaring sound, as you drive this sound follows your speed.  The faster you go the sound gradually raises to high tone.  When you decelerate the sound changes to lower tone.  As if you feel you are driving a huge truck but in fact, it is not.

Second, an alert sound when you change gears, there is something like that bumps to each other inside.  At any gear shift, you will hear that sound after you release the clutch and accelerate.

These two symptoms should not be taken for granted.  It should be addressed immediately as long as you have the time to do so.  Not attending to these will cause you more delay along your way and more expenses incurred due to breakage of parts.

Generally, more often these are caused by corroded bearings or tear and ware of parts and are not on their right fittings.  I have a video to show what I was saying and I hope it helps convey the message I am trying to impart.

Steps on how to disassemble the Differential for Repair

First, we have to remove the axles from both sides.  So remove the tires and detach the brake assembly.  Here is the image below.

Fixing Rear Differential Problems rear brake assembly

Second, with that brake assembly, the axle is connected to it so you have to pull it to be removed from the differential.  See the video below.

So the differential is now detached from the housing and is inspected for any parts that are damaged.

The video below will show why the differential has a problem and is having a roaring sound.

Bearings Too Loose

You’ve noticed that by my own hands I took off the bearing which should be tight. What will happen to this is that even I am going to buy a new bearing and replace the old one the problem will remain. Why? The problem is not on the bearing but it’s on the shaft.

To remedy that I brought it to the shop for build up.  They will just weld a little around the shaft and round it again according to the proper size and then press the bearing on it.

Now the bearings are rightly fitted on both sides of the differential we will bring it back to the housing.

So, that’s it we have fixed the problem producing the roaring sound.

After we have assembled it we did have a test drive and good enough all the symptoms were gone.

And for the alert sound that seem to bump each other inside the differential inspect other parts that may have been loose for tightening or have some adjustment.

Thank you for reading this post and I hope you have found enlightenment on the differential issue you are looking for.

Drop your comment below or send me private message on my email: jjimmydolo@gmail.com, and I will respond to you as soon as I read your message.


Hints for Exhaust System Maintenance

Hints for exhaust system maintenance reminds us that even though it may not be obviously having some problems on the exhaust system, it is better to always check for immediate repair if ever there are even if it is minor.

Here are some hints for exhaust system maintenance for us to consider.   Critical Checkpoints of the Exhaust System Exhaust systems that are still good and are not being replaced should be visually checked.  Starting at the front of the car, make your way to the rear.

Manifold to Exhaust pipe joint:
Gasket sealer ring may be made of cast iron, powdered metal or asbestos compound packing.

Hints for Exhaust System Maintenance Manifold

Look for pin size holes, excessive rust, cracks, and deterioration.

Hints for Exhaust System Maintenance bends

To find faulty brackets, gently force the muffler up and down to see which one is damaged or broken.  When you work on brackets, you will probably find that nuts are easier to remove by using a set of deep six point sockets instead of 1/2 or 9 inches open, box wrench combinations.  If you work on Japanese of European cars (eg. Toyota, Datsun, Colt, Volks, etc.)  metric size tools are probably needed.

Hints for Exhaust System Maintenance brackets

Clamp  (If there is any)
Tighten loose clamps.

Hints for Exhaust System Maintenance clamps

Check for breaks around the perimeter of the endplates, pinholes, and defective muffler baffles.

Hints for Exhaust System Maintenance muffler

Exhaust noises caused by pressure waves in the gasses are regular and normal.  Mufflers usually deteriorate from inside out, so damage may not be visible.  If the muffler begins to rattle and produces excessive noise, the cause is usually a mechanical failure.  Most common defects are loose or damaged baffles or clogged flow tubes.  Also, pay attention to both end plates of the muffler. Tap the muffler with your hand or lightly with a metal tool.  Listen to suspicious sounds made by falling flakes of rust and for rattles from loose tubes or baffles.  a muffler that has deteriorated inside often emits a dull sounding noise rather than a metallic ring when tapped with a metal tool. If you suspect an exhaust system leak, locate it by means of smoke signals.  Pour kerosene or light oil (or carburetor cleaner, if you have any) into the carburetor while the engine is idling fast.  The smoke produced will seep through and reveal even the tiniest pinhole which will be easily visible on the car.  Sometimes exhaust leaks may be detected by a hissing sound.     Smoking Car A simple cause of a smoking car is a loose crankcase bolt.

Hints for Exhaust System Maintenance-smoking car

If your car smokes like this, and afterward you find that it is coming from the oil filter cap, tighten those oil pan screws.  They need tightening to maintain crankcase vacuum. Other causes may be defective pump gaskets, front cover gaskets, intake manifold end seal, and crankshaft seal.  But this is unlikely.