400 dry filter
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Post Fiend
Joined: Dec 2006
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From: Lexington Mo
400 dry filter
I've made a few post's here about my 79 F150 400 4x4. The engine ran srong, but like most oil pressure is near nothing after warming up. Last week we installed a high valume oil pump. Gained a little pressure, but still fell to near nothing at an idle. And I don't like the 10psi, to 1000 rpm.
After getting the donor engine in yesterday (not finished) we removed some things from the old engine. Removed the new oil filter (with new oil pump and oil) and it was bone dry, nothing in it at all. The engine had atleast 15 minutes of run time after the pump was changed. Any ideas? Will take it apart after the truck is back on all fours.
Bob
After getting the donor engine in yesterday (not finished) we removed some things from the old engine. Removed the new oil filter (with new oil pump and oil) and it was bone dry, nothing in it at all. The engine had atleast 15 minutes of run time after the pump was changed. Any ideas? Will take it apart after the truck is back on all fours.
Bob
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From: chicago burbs
does/did it have the external cooler adapter on it?
i saw an M/400 that didn't pump oil to the filter, it had the factory cooler/adapter on it. i suspect that the control valve inside the adapter came apart and blocked oil flow to the filter.
i made it fully clear what i found, but it didn't make it back from it's fishing trip to Canada from Chicago.
i saw an M/400 that didn't pump oil to the filter, it had the factory cooler/adapter on it. i suspect that the control valve inside the adapter came apart and blocked oil flow to the filter.
i made it fully clear what i found, but it didn't make it back from it's fishing trip to Canada from Chicago.
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Joined: Jan 2008
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From: Irondale, Al.
I don't know what the deal is with the filter being dry, but if this engine has alot of miles and it wont hold oil pressure at idle or low rpm's after warm up, then the cam bearings are probably worn out.
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Joined: Apr 2004
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From: Eastern Ohio
Oil pumps have a bypass valve in them, in case the filter clogs. It keeps oil moving through the engine instead of blowing the filter off. You may have a problem with the valve.
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From: chicago burbs
the front cam bearing is the only one that even 'might' affect oil pressure in a 335 series engine
the oil pump bypass does not circulate oil through the engine, it dumps it back into the pan. it's actually the oil pressure regulator exhaust port.
some oil filters have a bypass built in, some do not.
ubereal2, what's the story with this engine, was it just rebuilt or put back together other than the oil pump?
have you checked for oil at the front port? it's a block plug between the fuel pump and the oil filter, if you pull that plug out it's a straight shot right from the oil pump. just cranking the engine with the coil wire off should pump a lot of oil out.
is it possible some smart@$$ shoved something down the oil hole while the pump was off? the front port plug is the passage you need to check.
some oil filters have a bypass built in, some do not.
ubereal2, what's the story with this engine, was it just rebuilt or put back together other than the oil pump?
have you checked for oil at the front port? it's a block plug between the fuel pump and the oil filter, if you pull that plug out it's a straight shot right from the oil pump. just cranking the engine with the coil wire off should pump a lot of oil out.
is it possible some smart@$$ shoved something down the oil hole while the pump was off? the front port plug is the passage you need to check.
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Post Fiend
Joined: Dec 2006
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From: Lexington Mo
When I got the truck just over two years ago, it really just bearly ran. A vacuum gauge showed that the valeve were bad/not seatting/burn what have you.
Re-man heads were put on, as well as new timing chain and gears, water pump, belts/hoses. It's had low oil pressure since I've had it. I have another engine in the truck now, and nearly finished timing. Then the 400 that was in it is coming apart. There will be plenty of pictures.
Bob
Re-man heads were put on, as well as new timing chain and gears, water pump, belts/hoses. It's had low oil pressure since I've had it. I have another engine in the truck now, and nearly finished timing. Then the 400 that was in it is coming apart. There will be plenty of pictures.
Bob
