502 Catastrophic Failure!!! Why does this happen?
07-01-2014, 05:10 PM
#1
502 Catastrophic Failure!!! Why does this happen?
The boat ran great last year, this year first time out ran a little funny. Then was hard to start. Then wiped out the starter. Thought I had bad gas or something, added water zorb and it seemed to be running really well again.
3rd time in the water and after taking a swim break we decided to end the day with a little cruise. Ran it up to about 4900 rpm, no trim yet or anything, temp was good, oil pressure good, then pop bang smoke, not running!
Could bad fuel do this? I am just at a loss for what happened.
3rd time in the water and after taking a swim break we decided to end the day with a little cruise. Ran it up to about 4900 rpm, no trim yet or anything, temp was good, oil pressure good, then pop bang smoke, not running!
Could bad fuel do this? I am just at a loss for what happened.
07-01-2014, 05:24 PM
#3
Registered
Well that is certainly catastrophic. Doubt bad gas would do that in a short time. Maybe over long time but that looks like a bearing spoun and locked the crank.
Wannabe
Wannabe
07-01-2014, 06:25 PM
#7
How many rods did that spit? I see at least 5 and 6, but did 3 and 4 spit also? How was your oil pressure before this happened? Was it any different? There had to be some warning ahead of times. Engines don't just spit this much stuff out without warning. How many hours were on it since it was apart? I can only imagine how sickening that must have sounded when it squeeked. My condolences.
Platinum Member
07-01-2014, 06:48 PM
#9
The engine was getting close to 200 hours. Never run real hard. Oil pressure was great. Didn't have a tick, tap, shake or shimmy.
The only thing I saw on tear down was a little rust on a few intake runners on the heads. The only thing I can figure is water in the fuel.
Oh, and it broke #3, 5, and 6.
For what its worth, the other engine started acting funny too until I added the water zorb.
I am definitely pumping out the tank!!!
