no oil pressure
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Lead Driver
Joined: Oct 2004
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From: Central Oregon
no oil pressure
I have a 80 Bronco with a 460 car engine with a extrenal oil filter, the last oil change I put on a new filter, a Puralator Pure1, and started the engine-no oil pressure. Next, I changed the the filter to a regular Puralator filter-very little oil pressure. I put the filter and there was a LOT of pressure at the seal on the filter. I pushed a punch through the relief valve and put it back on- pressure was good, almost normal. About 2 weeks later I was is Portland,Or and loss the gasket on the timing chain cover, after repairs and a new oil change witha Fram filter, No oil pressure. Pushed a punch through the relief valve and I have oil pressure but not normal. Anything anybody may think of this problem I would like to here it. Engine has 10,000 on a complete rebuild. Thanks Allen
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Joined: Mar 2001
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From: So Cal
Hmmm doesn't sound right but then you know that. I don't have any experience with the 460 internals so taking quasi educated guesses...
A timing chain cover isn't under a lot of pressure other than what ever air pressure is in the crankcase. So for the chain cover to leak on a new rebuild tells me the rebuilder didn't seal at least that part of the engine properly. If there is a lot of pressure in the crankcase then it could be that the PCV or other breather isn't working properly or the rings are leaking badly.
I have never heard of punching the relief valve, a weird problem and strange solution. But anyway, not having pressure when you put on a new filter and then getting pressure after punching or disabling the relief valve tells me the oil pump system is too weak to push oil thru the filter. Not good. Do you have a mechanical guage? A lot of the newer trucks have dummy guages that read right about normal almost no matter what until the engine siezes.
Wild guessing on low oil pressure is the relief spring in the oil pump is dead, there are some massive oil leaks inside the engine due to improper assembly or maybe a gasket was put in wrong and cut off the oil flow.
With a mechanical guage you should be able to tell what your actual pressure is. I would start with knowing what the pressure is. If it is low, you would need to look for bad pump, clogged or plugged passages, loose bearings, missing oil gallery plugs etc.
You said external oil filter. Do you mean a remotely mounted versus engine mounted filter? If remote, are your oil lines clear and not twisted etc? Can you check if oil goes into and out of the mount easily?
With 10,000 miles on the engine, maybe you are still under warranty?
Good Luck,
Jim Henderson
A timing chain cover isn't under a lot of pressure other than what ever air pressure is in the crankcase. So for the chain cover to leak on a new rebuild tells me the rebuilder didn't seal at least that part of the engine properly. If there is a lot of pressure in the crankcase then it could be that the PCV or other breather isn't working properly or the rings are leaking badly.
I have never heard of punching the relief valve, a weird problem and strange solution. But anyway, not having pressure when you put on a new filter and then getting pressure after punching or disabling the relief valve tells me the oil pump system is too weak to push oil thru the filter. Not good. Do you have a mechanical guage? A lot of the newer trucks have dummy guages that read right about normal almost no matter what until the engine siezes.
Wild guessing on low oil pressure is the relief spring in the oil pump is dead, there are some massive oil leaks inside the engine due to improper assembly or maybe a gasket was put in wrong and cut off the oil flow.
With a mechanical guage you should be able to tell what your actual pressure is. I would start with knowing what the pressure is. If it is low, you would need to look for bad pump, clogged or plugged passages, loose bearings, missing oil gallery plugs etc.
You said external oil filter. Do you mean a remotely mounted versus engine mounted filter? If remote, are your oil lines clear and not twisted etc? Can you check if oil goes into and out of the mount easily?
With 10,000 miles on the engine, maybe you are still under warranty?
Good Luck,
Jim Henderson
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Lead Driver
Joined: Oct 2004
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From: Central Oregon
Thanks Jim, sense I'm the builder, it is still under warranty. The leak was out of the water port in the timing case cover, after a long pull with a trailer over Mt Hood. But as the oil pressure seems to be good at the filter, I'm thinking that the return line on the remote filter maybe the problem, I will check that out tonight when I get home.
Thanks, Allen
Thanks, Allen
