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2006 Hyundai Accent, Timing belt missing some teeth. Easiest way to check if valves are bent without pulling heads Plugs are normal no evidence of piston hitting them
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turn it over slowly - do a
turn it over slowly - do a compression test - check timing marks to see how far off they are.
Did compression check #1
Did compression check #1 cylinder at 145, all others stayed 0. Figured must be valves bent, in trying to loosen first head bolt (8mm allen) rounded bolt out. How do I remove this bolt?
Turn the engine by hand
Turn the engine by hand (using a socket and ratchet), until the piston on one cyliner is on Top Dead Center and perform a cylinder leakage test (this test forces compressed air into the cylinder---where the air escapes the cylinders tells you if the valves (or anything else)are leaking. Do this on each cylinder. May have to take it to a shop for this test.
Compression test is a little risky because the piston could hit the valves as you are spinning it over while performing the test.
You'll need a 1/2 drive
You'll need a 1/2 drive socket (8mm) and a breaker bar. this is a special socket (may have to purchase from snap-on or the dealer) normal sockets might break.