Not sure whats going on with my motor. On thursday we launch and made it about 2 miles the oil pressure jumped up to 80psi and started knocking  . I shut it off right away and got towed to shore and put it back on the trailer. I checked the oil before launching and it was full. I also checked it when i put it on the trailer and it was still reading full. Do you think i spun a bearing? Any input would be greatly appreciated thanks

Curious why recommend pull plugs and check compression? Bad rings increasing pressure in crankcase?

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Im going to be pulling the motor this week and dropping the pan. A good family friend is going to come over and check it out and see what went wrong. My one question is tho can i pull the motor with out pulling the pump?

Yes, Best time was 12 minutes...

Dan'l

Pull the motor last friday took the oil pan off and there lies metal shavings everywhere. There was also a 1" sliver stuck in the oil pump screen. I guess it's time to do a full rebuild on her and hopefully get another 25 plus years out of it.

Not sure whats going on with my motor. On thursday we launch and made it about 2 miles the oil pressure jumped up to 80psi and started knocking  . I shut it off right away and got towed to shore and put it back on the trailer. I checked the oil before launching and it was full. I also checked it when i put it on the trailer and it was still reading full. Do you think i spun a bearing? Any input would be greatly appreciated thanks

While you have it apart for rebuild, you may want to check to make sure you have the correct oil pressure sending unit to work with your gauge.  Normally I would expect a big failure to drop the gauge to zero instead of peg to 80.  I just rebuilt an engine for a guy who called saying before he started to oil prime with the drill it was at 80 psi, which is impossible since there would have been zero pressure at that point until the drill was turned.  The needle went to around 40 psi on the drill motor, but while he was talking to me on the phone he tested my logic by slowing the drill motor and watching the gauge CLIMB.  He had switched the engine from one boat to another prior to breaking it and bringing it to me, so the sender did not match the gauge, and also would have been giving false readings.

While you have it apart for rebuild, you may want to check to make sure you have the correct oil pressure sending unit to work with your gauge.  Normally I would expect a big failure to drop the gauge to zero instead of peg to 80.  I just rebuilt an engine for a guy who called saying before he started to oil prime with the drill it was at 80 psi, which is impossible since there would have been zero pressure at that point until the drill was turned.  The needle went to around 40 psi on the drill motor, but while he was talking to me on the phone he tested my logic by slowing the drill motor and watching the gauge CLIMB.  He had switched the engine from one boat to another prior to breaking it and bringing it to me, so the sender did not match the gauge, and also would have been giving false readings.

Its the original motor that came in the boat. So i don't think thats my issue. It is strange that the oil pressure went to 80psi. Last year i did notice on the gage  it was running higher then normal around 65 to low 70'spsi when i would get on the throttle hard. I don't know if maybe the gage is going out or if it was actually reading correctly or not!?

Perhaps it's possible that some debris went through the oil pump and got stuck in the bypass so it can't open.

Well i finished pulling the motor apart and the #4 rod bearing is the one that spun. The rod does not look bent or tweaked but it is discolored.Now my question is what is it going to take to get this motor back together? I would like to find someone that could possible help me build the motor and show me the proper way of doing it. Ive never done anything this major but i have been doing a lot of research and i really want to learn.

Let me know if you need a hand .. Just finished rebuilding my 454 ...  It does take patience .. And some $$$$ .. I have a few places that you can get a lot of the parts for pretty cheap and I'm not talking Chinese crap...

Cool thanks i appreciate it. If i get time this week I'm going to drop everything off at the machine shop. Ill let you know about getting the parts when i get the block back and see what I'm going  to need.

Sucks man. I had this happen on Friday. 20 yrs on the 454. Time to pull it Monday and see what I'm in for.


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