Compression

QUINTON

MEMBER
1999 DAIHATSU TERIOS
4 CYL
FWD
MANUAL
169,000 MILES

My 1999 terios was leaking oil, then the car could not idle on its own, took it to the mechanic and he said there is no compression on number one valve, he also said there is a hole in one piston, I had the motor redone three months ago and had the cylinder head redone three times before, the mechanic says that he think the head was skimmed one to many times and know there is compression in the engine. Can this be the case? Or is something esle wrong

Tuesday, November 23rd, 2010 AT 11:22 AM

3 Replies

ERNEST CLARK

MECHANIC
1,730 POSTS

Well this is tough one to answer, because it depends on the honesty of the mechanic.

An engine rebuilder would normally measure the block deck height and cylinder head deck surface to make sure there wouldn't be any problems. But if they skipped this procedure, it's possible it was milled too much and the valve head slapped a piston and punched a whole through it.

As for the car not idling on it's own: Does it drive well at higher rpms? If so, then there's no whole in your piston or broken valve. If it won't, then it's possible he's telling you the truth.

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Tuesday, November 23rd, 2010 AT 11:33 AM

QUINTON

MEMBER
3 POSTS

The car wont idle at all on its own unless you keep your foot on the accelerator so the minute you get to a stop it cuts out, he says the reason why the oil leak is because of the piston, however I have not been using oil that much, nor have I been using water

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Tuesday, November 23rd, 2010 AT 11:47 AM

ERNEST CLARK

MECHANIC
1,730 POSTS

No. You definitely don't have a hole in your piston. That doesn't mean there's not some other cause of low compression to one cylinder. But I suggest you find another mechanic. And call around first, until you find someone willing to do a free estimate.

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Tuesday, November 23rd, 2010 AT 12:12 PM