stancalame
Petty Officer 2nd Class
- Joined
- May 10, 2014
- Messages
- 113
Friends, Romans, Countrymen, PLEASE lend me your ear.
I have a 1992 Galaxie 20' runabout I/O with OMC King Cobra sterndrive and 5.7 Chevy 350 engine. Engine is rebuit and not sure how old it is as I bought boat used. I had the motor pulled out last year to replace a piston that looked like it burned too lean from the color on the valves compared to others. I have a very knowledgable (older neighbor who did the work so I did not witness the replacement. He's rebuilt hundreds of motors so I trust him. After that, I I discovered rear main leak so had to pull it again and fixed it. I think my neighbor may have pinched the seal installing. He's very experienced but does not see well these days.:confusion:
After replacing main seal, boat ran well remainder of last summer. No temp or oil pressure issues. I took boat out today after replacing prop with same Aluminum 14.5" X 19 pitch prop that came off of the drive. Old prop had damage on all three bladeshowever but still ran pretty good howvever; I had noticed vibration at lower speeds and same experienced neighbor indicated vibration could damaged shat seals. I have never been into the lower unit and owned boat for two years. I know I need to service with lube and now thinking I need to check impeller.
So my current issue is that my daughter and I drove it for a good 20-30 minutes at 40-40MPH, 3,500 to 4000 RPM. I let my douaghter drive so I could check out the newly recovered back bench seat, when I started smelling smoke. I immeadiately had her shut it down and I checked under cowling and did not check the guages. Engine seemd really hot but no visible oil anywhere.I pulled dipstick and oil was below ADD line however it creeped up the longer I waited.
I tried to restert but engine would barely turn over and I stopped. I've experienced that beofre when engine hot. I waited another 5 minutes and engine started and I observed oil pressure at 20 pis when its normally a strong 60. The temp guage was at least 215 but I didnt let it run long. I got a tow back to ramp and mannually trailered boat. When I got it back home, I put muffs on it and started again. It turned over stronger and took a few more revolutions to start but it did. My Oil pressure came back to 60 psi but temp was high 200F+ immeadiately.
Im not sure what where to go from here but sure that I cant take it out until I understand whats happening.
1) My first thought hot temp was that maybe thermostat was not cooling but seems I would have had higher temp sooner than 30 minutes but maybe not.
2) Second thought is maybe water pump shot and not pumping enough water. Maybe new prop was grabbing more water putting more strain on motor, buy why would oil pressure drop if it was water pump impeller? Does not seem logical.
3) Weak oil pump gave up buy is this discription indiciative of that especially since presssure came back up after it sat for 30 minutes while I transmported on trailer home.
4) Have I screwed something up in the engine? I hope not, I'd hate to have to pull it a 3rd time in 18 months.
Whatwould you do? I can do minor checks but am not that knowlageable on innerworking of engines. I'll be consulting my mechanic neighbor but thought I'd get a head start tonight.
I'm sure I've left pertinent iformation out so let me know your thoughts.
I have a 1992 Galaxie 20' runabout I/O with OMC King Cobra sterndrive and 5.7 Chevy 350 engine. Engine is rebuit and not sure how old it is as I bought boat used. I had the motor pulled out last year to replace a piston that looked like it burned too lean from the color on the valves compared to others. I have a very knowledgable (older neighbor who did the work so I did not witness the replacement. He's rebuilt hundreds of motors so I trust him. After that, I I discovered rear main leak so had to pull it again and fixed it. I think my neighbor may have pinched the seal installing. He's very experienced but does not see well these days.:confusion:
After replacing main seal, boat ran well remainder of last summer. No temp or oil pressure issues. I took boat out today after replacing prop with same Aluminum 14.5" X 19 pitch prop that came off of the drive. Old prop had damage on all three bladeshowever but still ran pretty good howvever; I had noticed vibration at lower speeds and same experienced neighbor indicated vibration could damaged shat seals. I have never been into the lower unit and owned boat for two years. I know I need to service with lube and now thinking I need to check impeller.
So my current issue is that my daughter and I drove it for a good 20-30 minutes at 40-40MPH, 3,500 to 4000 RPM. I let my douaghter drive so I could check out the newly recovered back bench seat, when I started smelling smoke. I immeadiately had her shut it down and I checked under cowling and did not check the guages. Engine seemd really hot but no visible oil anywhere.I pulled dipstick and oil was below ADD line however it creeped up the longer I waited.
I tried to restert but engine would barely turn over and I stopped. I've experienced that beofre when engine hot. I waited another 5 minutes and engine started and I observed oil pressure at 20 pis when its normally a strong 60. The temp guage was at least 215 but I didnt let it run long. I got a tow back to ramp and mannually trailered boat. When I got it back home, I put muffs on it and started again. It turned over stronger and took a few more revolutions to start but it did. My Oil pressure came back to 60 psi but temp was high 200F+ immeadiately.
Im not sure what where to go from here but sure that I cant take it out until I understand whats happening.
1) My first thought hot temp was that maybe thermostat was not cooling but seems I would have had higher temp sooner than 30 minutes but maybe not.
2) Second thought is maybe water pump shot and not pumping enough water. Maybe new prop was grabbing more water putting more strain on motor, buy why would oil pressure drop if it was water pump impeller? Does not seem logical.
3) Weak oil pump gave up buy is this discription indiciative of that especially since presssure came back up after it sat for 30 minutes while I transmported on trailer home.
4) Have I screwed something up in the engine? I hope not, I'd hate to have to pull it a 3rd time in 18 months.
Whatwould you do? I can do minor checks but am not that knowlageable on innerworking of engines. I'll be consulting my mechanic neighbor but thought I'd get a head start tonight.
I'm sure I've left pertinent iformation out so let me know your thoughts.