Question about 1999 Toyota Camry

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Trying to replace broken timing belt. Trying to set #1 cyl. to TDC manually. no compression reading on 1 &4, readings on 2 & 3. What could cause this?? HELP!!

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If the engine is an interference type (most are these days) there will almost certainly be a few bent valves when the timing belt breaks and possibly worse damage. Once you have verified the problem and gone as far as you can towards locating and diagnosing the likely faults the cylinder head will have to be replaced for further examination.

There should be no need to manually identify tdc of the timing cylinder (usually at the timing belt end but not always) as the manufacturer usually provides accurate timing marks. I would guess you need to read a bit about engines in general and about your engine specifically.

Good luck!

Posted on May 18, 2016

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Hole in the piston crown is the worst Charles, but let's not be pessimistic :>(

More likely valves open. At TDC firing stroke both inlet and exhaust valves should be closed. The flat, low part of the cam should be on the followers. So 1 and 4 have valves open, 2 and 3 are closed. If you turn the cam 180 degrees, you should have compression on 1 and 4 and no compression on 2 and 3.

The other thing though, is that when the timing belt breaks, the valves are often in the wrong place at the wrong time and can often meet the piston head on. This can bend the valves. or damage the piston. The normal advice is to remove the cylinder head to check, and then service the valves whilst you have it apart.

A job like this, you need a workshop manual.

Posted on May 18, 2016

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To clarify earlier replies, the 99 Camry engine is NOT an interference type, so it will not have bent valves from a snapped timing belt.

It sounds to me like you have no 1 cylinder on the exhaust/intake up stroke, not the compression/firing up stroke, which would produce the result you describe.

Try rotating the engine another 180 degrees.
.

Posted on May 19, 2016

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Camshaft not in the proper place

Posted on May 18, 2016

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Posted on Jan 02, 2017

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