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Originally posted by SSgohan
I don't think I went to tight on the valve adjustment because the spec under the hood says 0.09mm for intake and 0.17mm for exhaust.
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Christ. I don't have an H23 (or manual), so I can't comment- but .002" of clearance is nothing. I find it hard to believe that it's the right spec, but if that's what the sticker says...
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I think the cause of low compression in cylinder 1 is not related to the valve adjustment because all four cylinders are adjusted the same way.
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That doesn't mean that one rocker or valve doesn't expand more or less than another. Do you know how thick .002" is? I wouldn't be surprised if that .002" disappears when the engine heats up.
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I did it the same way as the second picture was.(a little off TDC - off by a tooth). I suspect one or more valves are bent or burnt. How would you verify it?
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A bent valve usually results in much worse problems, though this could certainly be a burnt valve. The only way to check (truly) is to leak-test or teardown, though there are a few things you can do (see below).
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Also, would it be the reason why the engine vibrates? Why shouldn't I drive the car? It is driveable.
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This could be why the car is vibrating, if one cylinder is low and not making as much power as the others. I offer that there are a lot of other reasons on an H23 for vibration, though, like motor mounts or other non-related problems.
If you run too tight of clearance you might not get complete compression in one or more cylinders. This is NOT a very good way to drive, and on an interference engine increases the likelihood of introducing the pistons and the valves to each other. I don't know the compression ratio of the H23 offhand, but I suspect it's got a fair bit of interference. That, and for general engine health is why I would say do not drive it... then again, I also think .002" of clearance is too little. Apparently Honda does not.
*I* would suggest backing off the clearance on that valve by .003 or .004" (to .005 or .006") and see if the compression comes back. If so, you know it's the adjustment. If not, set it back to what it was and do the following:
Decarbonizing:
- Try a bottle of Regane. You should be able to get it at your local Hi/Lo-O'Rielley's or Target. Put a bottle in with your next fill up and run at least one more tank through after that (without adding more). After that second tank, compression test again.
- If it's still low, remove the coil wire or all your plug wires. Remove the plug from the suspected cylinder. Apply 2 capfulls of brake fluid in through the plug hole. Crank the engine for 5-10 seconds (might want to do it with a towel over the plug hole since you will blow brake fluid out of it. Repeat. Button it back up and take it for a 10-15 minute drive, then re-test compression.
Linear Mode
