flusher
Super Member
- Joined
- Jun 4, 2005
- Messages
- 7,538
- Location
- Sacramento
- Tractor
- Getting old. Sold the ranch. Sold the tractors. Moved back to the city.
My 1964 MF-135 diesel is showing unusual oil pressure fluctuations. Oil pressure before this problem arose stayed in the 50-60 psi range constantly.
Now after engine start the pressure rises to 30 psi at 1300 rpm, fluctuates between 20-30 psi for 7-8 minutes and then drops to zero or near zero in about a minute. Shut off the engine immediately. Got a little coolant dripping out of the radiator overflow.
Repeated this behavior 3 times before stopping to think about the problem.
Checked the oil level; it's OK. Just a little oil leakage (less that a teaspoon) after engine shutoff, probably from the breather tube on the valve cover. No unusual smoke from the exhaust pipe.
The oil pressure gauge is a mechanical gauge with small diameter metal tubing to the engine.
Disconnected the oil pressure line at the engine and got a small pressure release and a little oil dribble from the fitting on the block.
There's a check valve on the outlet of the oil pump. Is this accessible by removing the oil filter plate on the block?
How about crankcase flush? Any recommendations?
Anybody have experience with Lucas Heavy Duty Oil Stabilizer?
Now after engine start the pressure rises to 30 psi at 1300 rpm, fluctuates between 20-30 psi for 7-8 minutes and then drops to zero or near zero in about a minute. Shut off the engine immediately. Got a little coolant dripping out of the radiator overflow.
Repeated this behavior 3 times before stopping to think about the problem.
Checked the oil level; it's OK. Just a little oil leakage (less that a teaspoon) after engine shutoff, probably from the breather tube on the valve cover. No unusual smoke from the exhaust pipe.
The oil pressure gauge is a mechanical gauge with small diameter metal tubing to the engine.
Disconnected the oil pressure line at the engine and got a small pressure release and a little oil dribble from the fitting on the block.
There's a check valve on the outlet of the oil pump. Is this accessible by removing the oil filter plate on the block?
How about crankcase flush? Any recommendations?
Anybody have experience with Lucas Heavy Duty Oil Stabilizer?