johnson no-luck
Recruit
- Joined
- May 21, 2007
- Messages
- 1
I have a 1990 johnson 60 horse 3 cyl outboard wich i,m planning to rebuild.
I have a few problems/questions that i would like to hear your thoughts about.
1.The lower cylinder has some play on it,s big end bearing but the crankshaft looks ok, what is the minimum size for the crankshaft journals and the maximum size for the connecting rod eye? Do you think this play can be caused by just the bearing alone, and that it is a matter of just replacing this?
2. I ve heard numerous storys of these engines being prone to piston seizure,
what can i do to prevent this after the rebuild?
Is it wise to rejet the engine to a bigger main jet and if so what size?
What is the best piston clearance for this engine to prevent it from seizures?
3. I plan on not running the vro pump anymore as i think this is very unreliable,is it possible to just block the oil injection part amd use it as a fuel pump, or do i need to mount a normal fuel pump from a different model on it, and if so what type??
4. It seems like the crankcase is getting water in it,s lower part, where can this come from?The head gasket whas replaced and the exhaust cover and gasket also, it,s a fresh water engine????
Any help from the more experienced guys would be great, thanks Peter
I have a few problems/questions that i would like to hear your thoughts about.
1.The lower cylinder has some play on it,s big end bearing but the crankshaft looks ok, what is the minimum size for the crankshaft journals and the maximum size for the connecting rod eye? Do you think this play can be caused by just the bearing alone, and that it is a matter of just replacing this?
2. I ve heard numerous storys of these engines being prone to piston seizure,
what can i do to prevent this after the rebuild?
Is it wise to rejet the engine to a bigger main jet and if so what size?
What is the best piston clearance for this engine to prevent it from seizures?
3. I plan on not running the vro pump anymore as i think this is very unreliable,is it possible to just block the oil injection part amd use it as a fuel pump, or do i need to mount a normal fuel pump from a different model on it, and if so what type??
4. It seems like the crankcase is getting water in it,s lower part, where can this come from?The head gasket whas replaced and the exhaust cover and gasket also, it,s a fresh water engine????
Any help from the more experienced guys would be great, thanks Peter