Question about 2001 Hyundai Accent

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One cylinder has zero compression. took head off replaced bent valves in cylinder 3 from timing belt breaking. Had head professionally rebuilt. cylinders 1, 2 & 3 have 120# compression. checked compression prior to putting in cams (all valves closed) compression came in at about 45# on all cylinders

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  • redhen23 Oct 05, 2009

    ghost45... Thanks for your response but I've already fixed it. The valve lash adjuster was pumped full of oil holding the valves open. I bled off the excess oil and everything was fine. The key here was compression without cams and no compression with cams. Sorry cylinder leak down test doesn't tell you everything especially when the car was running fine prior to breaking the timing belt. Oh and I already had access to the hmaservice manuals.

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OK!... did you do a cylinder 'leak down test'?.. .if not, do it! If any 'unacceptable' leakage, have the head REDONE! NOW!.. you must BE SURE the valve timing is accurate!... Go to www.hmaservice.com and register( Vehicle by VIN). Afterward, you have access to shop manuals, service bulletins, wiring diagrams, etc. about your vehicle.

Posted on Oct 04, 2009

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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.

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