help, new engine, no oil pressure
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help, new engine, no oil pressure
i put a rebuilt engine in my truck and i have no oil pressure at the top end. i primed the pump til it was gushing out the oil pressure sending unit line with the oil cap off. i put the oil cap on and i can't even get it to come up the line. i take off the oil cap and it only registers like 5 pounds of oil pressure. the bottom end sounds nice and smooth so i think it is getting oil, it just sounds bad up top. i would normally think gallery plug but the way the cap affects it that throws me for a loop. has anyone heard of this before?
Post Fiend
Joined: May 2006
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From: Central Florida
The year/engine might help. My 89 4.9l the oil press sender was just below the head, so if you are getting oil up that high your head gasket might be interfering with the flow. My oil cap was on the valve cover and vented to the intake via PCV.
How heavy of an oil are you using? You may want to try priming with some thing real light like a 0w-20.
How heavy of an oil are you using? You may want to try priming with some thing real light like a 0w-20.
Tuned
Joined: Jan 2006
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Don't want to send you a curve ball, but I rebuilt my I6 one year ago, so things are a little rusty in my gray matter. There is a galley plug that was removed from my motor when they hot tanked it. They made sure to point it out after they gave the motor back to me to assemble. The plug was in the gasket kit, about 3/8 " dia. I think it's on the back of the motor. So if you have a standard trans, the oil from the unpluged port should be leaking from the transmission bell housing, onto the ground.
Maybe some others could chime in to see if I am blowing smoke.
Maybe some others could chime in to see if I am blowing smoke.
Elder User
Joined: Apr 2004
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Why would you have a line feeding the rockers? Top end is lubed thru the pushrods. The oil pressure sending unit is on the side of the block just under the
lifter cover plate just back of the distributor. I worked on 300's built in the seventies and I'm straining my memory on this one.
kotzy
lifter cover plate just back of the distributor. I worked on 300's built in the seventies and I'm straining my memory on this one.
kotzy
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Your line is directly into or teed into the main oil gallery of the block which means if you read five pounds you have five pounds. It may well be that the relief valve on the pump is stuck wide open, or that the pump is loose, either the mounting or the cover. Lastly the chance that on either end of the gallery a plug has been left out. I think I would start at the source, the pump.
PS If they used a gasket under the pump it may be bad as well.
PS If they used a gasket under the pump it may be bad as well.
Last edited by kotzy; Jan 16, 2007 at 06:32 AM.
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well pulled the valve cover, the oil flows through the passages, so the head gasket is fine. my bet is that i missed the front oil gallery plug since i did have the block hot tanked.
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From: Nashville
Originally Posted by bigbrown84truck
well pulled the valve cover, the oil flows through the passages, so the head gasket is fine. my bet is that i missed the front oil gallery plug since i did have the block hot tanked.
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that was exactly what i did, pulled the cover today pulled gear forward half an inch looked behind and seen a threaded hole. i'll have to let you all know what kinda oil pressure i get once i put the plug in, thanks all
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