Tommy in FLL
Seaman Apprentice
- Joined
- Apr 10, 2009
- Messages
- 44
The engine is a 1996 C85TLRU, a pretty typical 85 hp motor. It is essentially the same engine as the oil injected 90 hp motor, just with lower compression. 5.2:1 to be exact.
This engine has a problem with overheating after about 30 seconds under full power. It squirts water just fine, though with the thermostat and the water pressure regulator removed.
Initially I thought I had a head-gasket issue, since when I ran the engine with the thermostat cover removed, exhaust came out. I replaced the head gasket, and in doing so noticed that the outside of one of the barrels was chipped and repaired with marine tex. That and there was considerable corrosion and "spooge" in the water jackets. After the gasket went in, the symptoms were the same, still overheating.
Compression check: 85 psi/ 85 psi/ 88 psi, checked using a borrowed tool from the parts store and done according to the Yamaha manual.
Does this sound low?
Thanx in advance!
This engine has a problem with overheating after about 30 seconds under full power. It squirts water just fine, though with the thermostat and the water pressure regulator removed.
Initially I thought I had a head-gasket issue, since when I ran the engine with the thermostat cover removed, exhaust came out. I replaced the head gasket, and in doing so noticed that the outside of one of the barrels was chipped and repaired with marine tex. That and there was considerable corrosion and "spooge" in the water jackets. After the gasket went in, the symptoms were the same, still overheating.
Compression check: 85 psi/ 85 psi/ 88 psi, checked using a borrowed tool from the parts store and done according to the Yamaha manual.
Does this sound low?
Thanx in advance!