low oil pressure
#4
Sounds like someone put Lucas in to thicken the oil and get the pressure up for the sale. Now the viscosity is breaking down and the pressure is dropping. Best guess is a dead pump, but could be crank bearings as well. I'd call the seller of the engine.
#5
i put a new oil pump in it and it still does the same
#6
Let's straighten that statement out.
You ran the motor before installing the new oil pump, and you've verified that the readings are the same between both?
OR
You installed a new pump before running the motor and these are the only readings you've gotten.
If it's the former, you have issues in the oiling system beyond the pump. Clogged filter, crank bearing clearance too high, etc.
If it's the latter, it's anyone's guess, up to and including an installation problem.
You ran the motor before installing the new oil pump, and you've verified that the readings are the same between both?
OR
You installed a new pump before running the motor and these are the only readings you've gotten.
If it's the former, you have issues in the oiling system beyond the pump. Clogged filter, crank bearing clearance too high, etc.
If it's the latter, it's anyone's guess, up to and including an installation problem.
Last edited by mattdel; 05-31-2012 at 12:44 PM.
#7
My understanding
Is it or is it not a fact that oil pumps usually work or don't work? I've never experienced a low pressure problem related to a new working pump. I would try changing the oil to a 5 20 and add a 1/2 qt of low viscosity additive and see if the pressure is higher at cold start.
Reasons like that is why I don't like to just throw someone elses motor in. I like a fresh motor when I change, even if it's just a stock rebuild or crate motor.
Reasons like that is why I don't like to just throw someone elses motor in. I like a fresh motor when I change, even if it's just a stock rebuild or crate motor.
#8
Let's straighten that statement out.
You ran the motor before installing the new oil pump, and you've verified that the readings are the same between both?
OR
You installed a new pump before running the motor and these are the only readings you've gotten.
If it's the former, you have issues in the oiling system beyond the pump. Clogged filter, crank bearing clearance too high, etc.
If it's the latter, it's anyone's guess, up to and including an installation problem.
You ran the motor before installing the new oil pump, and you've verified that the readings are the same between both?
OR
You installed a new pump before running the motor and these are the only readings you've gotten.
If it's the former, you have issues in the oiling system beyond the pump. Clogged filter, crank bearing clearance too high, etc.
If it's the latter, it's anyone's guess, up to and including an installation problem.
#9
Is it or is it not a fact that oil pumps usually work or don't work? I've never experienced a low pressure problem related to a new working pump. I would try changing the oil to a 5 20 and add a 1/2 qt of low viscosity additive and see if the pressure is higher at cold start.
Reasons like that is why I don't like to just throw someone elses motor in. I like a fresh motor when I change, even if it's just a stock rebuild or crate motor.
Reasons like that is why I don't like to just throw someone elses motor in. I like a fresh motor when I change, even if it's just a stock rebuild or crate motor.
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