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How do I diagnose wether there is a hole in my piston after colliding with a valve?

I thinking there is because I have a huge amount of blow by...

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Do compression tests

Posted on Apr 20, 2017

Testimonial: "You're the expert, you know a compression test wouldn't isolate the damage to the piston. It's my buddies kids car, he's kinda broke, so he wanted more than the compression test. What I came up with was, pouring a quart of oil through the spark plug hole. Using the dipstick I watched how quickly it drained into the oil pan. Well that was all it took, out it came..."

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Why is wrong, I have an 86 toyota truck, 22re with 0 compression in #3, 125 in 1,2 and 4. I also have a LOT of blow by at oil fill cap. WTF?


a combination of valves and rings
more likely rings or hole in the piston to get so much blow by as blow by is not from valve problems
the combination could be that a valve head broke off and punched a hole in the piston

Apr 20, 2017 | Toyota Cars & Trucks

1 Answer

After replacing 3 valves and a piston on my sentra '89 1.3 I found that the pistons push up too high ad causes the crank to stop turning ad I am scared this will cause more damage. What can I do to fix...


That's impossible. The piston cannot go too high but the car can be out of time causing the valves to be open at the wrong time and collide with the piston.

Aug 24, 2013 | Cars & Trucks

1 Answer

No compression in 2001 Galant Mitsubishi


Hello bev7181
If you had a sudden complete loss of compression in all 4 cylinders, the timing belt most likely let go. Unfortunatly the mitsubishi engine is whats known as an interference engine. This means that
without the the timing belt to keep the crankshaft and camshaft turning in sync, a piston can be
coming up while the valves are coming down where they collide, causing bent valves and/or a hole
in a piston. I wish I had better news. Hope this was helpful

Apr 05, 2011 | 2001 Mitsubishi Galant

2 Answers

Timing belt broke and i need to set the timing


The pistons, valves and cylinder walls typically take a beating when the timing belt breaks. If yours didn't, I'm amazed.

But you can TRY this:
For most OHV engines with a timing belt there is usually a hole in the camshaft sprocket that can align with a hole in the head. If there are two camshafts, each sprocket typically has the same arrangement. Look closely, if there is no hole, there will be a mark of some kind to indicate #1 Top Dead Center.
Make certain that the crankshaft and the camshaft(s) are all at #1 TDC, if there are holes in the sprocket(s), push an appropriately sized drill bit through the hole, into the corresponding hole in the head to hold the camshaft timing, then replace the belt, making certain that any idler pulleys or tension adjuster pulleys are out of the way. After you've put the new belt on, Put the idler pulleys and tension adjusters back into their appropriate place then remove whatever you used to hold the pulleys in place.
Most of the time a valve will "kiss" a piston when the timing belt breaks. That causes immediate and fatal damage to the engine requiring (at minimum) a complete engine rebuild. Sometimes valve seats, pistons, cylinder walls and other components are destroyed when the piston and valve collide.

Feb 27, 2011 | 1992 Honda Accord

1 Answer

Hi, I have a problem the other day I was driving out of the drive way and it just stopped, the timing belt broke, I was told i would have to replace the whole engine because the vowels bent, but i was...


Daewoo, like most modern cars, have what is called an "interfering engine".

What that means is that the pistons and the valves run through the same space inside the engine... they can "interfere" with each other, and collide if something goes wrong.

To prevent this, the engines are carefully timed so that when any piston is up, the valves in that cylinder are also up so they cannot hit. This is called "being synchronized".

When a timing belt breaks, the pistons and valves are no longer synchronized. In such a failure, the camshaft (which moves the valves) stops first, and the crankshaft (which is moved by the pistons during a "power stroke") continues to move. Any valves which are in the down position get hit by their rising pistons and they are bent and broken. Often, the pistons themselves can have their connecting rods broken, and the damage can range from moderate to severe.

Depending upon the amount of damage (which can only be determined by a car enthusiast or a mechanic) the engine may be repairable. You need to have either a "gearhead" friend or a trusted mechanic take a look to see how bad the damage is, and if it is worth repairing.

Feb 01, 2011 | 1999 Daewoo Leganza

1 Answer

P0331 Code on 200 Pontiac


P0331 Spark Knock has not been sensed

The spark knock or ping is 2 flame fronts colliding in the combustion chamber, the shock wave of which can eventually blow holes through the piston crowns if severe enough. In late model engines the causes can include:
- fuel octane too low
- EGR system malfunction
- knock sensor (if equipped) malfunction
- PCM software not retarding ignition timing as required
- high engine operating temperature
- lean fuel mixture
- carbon deposits on piston crowns/combustion chambers

Hope helps.

Aug 20, 2010 | Pontiac Grand Prix Cars & Trucks

1 Answer

Is it necessary to change the timing belt in a 2004 Elantra VE with 65000 miles (105500 Km)? No problems with it, just mechanic says it's time.


60,000 miles is the typical recommended interval for timing belt replacement. The belt can become worn and skip a tooth or even break. In that event, the pistons can collide with the valves and cause a considerable (and expensive) amount of damage. Changing the timing belt at recommended intervals is good insurance to protect against valvetrain and piston damage due to belt failure.

Apr 21, 2010 | 2004 Hyundai Elantra

1 Answer

2oo2 cavalier timing chain broke need to know how to fix it??


With a new motor most likley. When a timing chains break pistons tend to collide with valves which can punch holes in the pistons or bend/ break valves. Usually at this point it is more economical to replace the engine than to actually fix it.

Jan 20, 2010 | 2000 Chevrolet Cavalier

1 Answer

03 kia rio-24000 km.will valves hit piston if belt breaks?


yep valves will hit piston if timing belt brake.timing belt keep your valves and piston timed.when intake valves and exhaust valve open.piston is on down stroke.the timing belt keep pistons and valves from colliding.your timing belt change is due at 60000 miles.but in some cases belt need to be inspect at 30000 miles.to be on the safe side.

Jul 20, 2009 | 2003 Kia Rio

3 Answers

Timing Chain and Valves


I think it's an interference engine but you can check quite easily at this point if the valves are bent. Pull all the spark plugs out, turn the crank so that all the pistons are 1/2 way down their bore, get a piece of fuel line that is just the right size to thread into the plug holes or a special fitting for this purpose, and blow into each cylinder after you have turned the cams in succession so that the valves should be closed at the hole you are blowing into. If a valve is bent, you won't have any trouble blowing into the cylinder. If it's good, you won't be able to blow very well at all.

Mar 30, 2009 | 1999 Suzuki Vitara

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