1995 d90 no oil pressure - Defender Source
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  #1  
Old January 16th, 2006, 07:39 PM
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Gerald McNeely
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1995 d90 no oil pressure

I recently purchased a 1995 D90 out of my friends back yard. He had parked it as a running driving vehicle but he needed the wheels to get his 4.6hse back on the road. I have never had oil pressure in this vehicle. Today i rebuilt the oil filter housing and pressure relief piston. I also took the oil pan down and checked the oil pickup for fractures or improper torque--it was ok. I still do not have oil pressure in this aggrevating vehicle. Any hints?
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  #2  
Old January 17th, 2006, 03:50 AM
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Mike Hammond
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Did you prime the pump gears when you put it all back together?

You need to pack the oil pump gears and voids in the housing with vaseline, the pump usually won't self prime.
Sometimes you can get away with taking out the distributor and spinning the pump gears with an electric drill. you'll need to bodge some sort of slotted bar to transfer drive from the electric drill to the top of the pump gears.
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Old January 17th, 2006, 07:06 AM
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Hans Haase
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Mike hit it right on the head, the pump is NOT self priming. You need to take the cover off again and pack the entire gear housing solid with vaseline.

I like to take a valve cover off so that I can physically see the oil coming out of the pushrods and into the heads, which lets you know that the whole system has oil, the lifters are fully pumped up and the rocker shafts are full. The clattering noise is another good indicator, since that goes away only when the lifters are pressurized and thus closing the gaps between the pushrods and rocker arms.

It's a situation unique to engines based on the Buick 215 design with the front mounted oil pump. Jeep V-8's have the same situation too, since they are actually based on the Buick as well.

-Hans
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Old January 18th, 2006, 03:10 AM
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Mike Hammond
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Sometimes you can inadvertantly drain the oil out of the pump while changing the oil if you remove the oil filter while the sump is empty
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