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1992 OMC 5.8L/Cobra rattles under light load

cheers731

New member
Please help with troubleshooting and fix. The engine rattles at 1200-1500 rpm when propeller is engaged. It goes away at higher rpm and no rattling at neutral at any rpm. What could cause this?
Thanks,
Frank
 
Bad u joint in drive? That's my first guess. Second would be a bearing going south. I assume you have checked the oil levels in both the upper and lower housings?
 
Thanks for the reply. A new gimble bearing was installed by shop and only has 30 hrs on it. The oil level checked fine on upper housing but not the lower housing. I thought the lower housing has no dip stick for oil level check but I may be totally wrong about it.
Thanks again,
Frank
 
Thanks for the advice.
The tank has 87 octane gas leftover from wither storage with fuel stabilizer, Stab-bil. I still have a quarter tank with old fuel, should I try to add higher octane or let it run low first then refuel with high octane? Also, I will check the timing too.
 
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