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ssobol
Joined: 27 Oct 2012
Posts: 3559
City/Region: SW Michigan
State or Province: MI
C-Dory Year: 2008
C-Dory Model: 22 Cruiser
Vessel Name: SoBELLE
Photos: SoBelle
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 Posted: Sat Feb 08, 2025 4:16 pm Post subject: |
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| Schuster wrote: | SSBOL, you're correct. It is my understanding that if the belt breaks while running that the cam shaft stops turning but the crankshaft will continue to turn. As a result timing is thrown off and as a result valves and push rods get bent by the piston pushing up into the valve and any number of problems can stem from that including a damaged piston, bent or broken valves, a damaged cylinder wall or head and possibly damaged camshaft. I guess the prudent course of action is to check the timing belt occasionally for wear.
Ken O, I would recommend that if you haven't looked at the belt or had a mechanic look at the condition of the belt that it is new to you, you should inspect it to know where you stand from the git go. Good luck. |
If the timing belt breaks, the engine will not run for very long at all because the valve and ignition timing get way out of whack very quickly. It would be mostly inertia from the rotating parts and maybe some back drive from the prop in the water.
The other issue with an older timing belt is that it can slip a notch or two if the teeth on the belt are worn. If it doesn't slip very far, the motor can still run (roughly) while the internals beat themselves to pieces. I had this happen once in a car which had a timing chain. The chain slipped a couple of notches. The engine still ran for a few days (with some odd noises) before giving up completely. The mechanic said the only thing to do was replace the engine. |
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