Broken Timing Chain and Bent valves

[valovic]

I purchased a 2002 FX 140 with 58 hours on it. The first day on vacation it was great. The second day it died 5 minutes out on the lake. I had to be towed back in. Having no tools on vacation I took it to a dealer and they diagnosed it as a broken timing chain. The engine, now only has 60 hours on it.

Getting it back home and taking it apart the timing chain was found at the bottom of the engine and 19 valves were bent.

The head that was on there was an SBT head. So something happened before that required a head change. There was some water in the engine oil, but not much in the reservoir. There was a little water in cylinder 2 & 3. No other parts were found that would cause the chain to break. The chain looks like it was twisted right at the broken link.

I'm thinking that the previous event bent the chain and it was not replaced, and now it finally broke. Lucky me. What else would cause a chain to break? What else do I have to look for? Why was there water in the engine? When it died it didn't make any odd noises, it just stopped like someone hit the kill switch.

[Technical Support]

Re: Broken Timing Chain and Bent valves

When the chain broke it sucked water in from the exhaust. Looks like our valves held up real good nothing broke to damage your cylinders, the O.E yamaha valves would have been in 2 pieces.