You start by knowing the engine size and other important details like did the belt break while the engine was running, did it just slip while you were doing a maintenance replacement, or is the engine still running. Timing belts are never a job to attempt without having the service manual in front of you, otherwise you'll be back here asking a followup question every few minutes and wasting time waiting for answers. Haynes and Chilton books will get you through it, but nothing beats the manufacturer's manuals. AllData and Mitchell On Demand are okay too. I'd copy and paste the procedure if I could but I have never been able to access the sites.
If the belt broke while driving, the valves will be bent. Around the late '80s and early '90s Honda recommended replacing the belt at 75,000 miles, ... And they commonly broke at 65,000 miles.
If you have a cylinder leakage tester and compressed air, you can turn the crankshaft so no piston is at top dead center, then turn the camshaft so the valves for a specific cylinder are closed, then see how much leakage there is in that cylinder. You might be able to borrow or rent that tester from an auto parts store. The only other way is to install the new belt, then perform a compression test before you put all the covers and brackets back together.
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Friday, October 19th, 2012 AT 1:47 AM