Oil Cooler
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Junior Member
Joined: May 2017
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From: london
Oil Cooler
I have a '93 4.0 which has had the oil cooler removed, and a by pass put on. After a drive of an hour or so oil pressure is way down at idle. Is this OK or should I replace the original cooling system?
Joined: Feb 2010
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From: Adelaide Stralia
Welcome to the Forum.
When time permits, please do an Intro in the New Members Area.
The oil cooler by-pass was a factory thing.
Not many markets got the cooler on the 6 cylinder.
My X300 3.2, and the X300R (Supercharged), do NOT have it in our market, and we are a tad hotter than the UK. Different body, I know, but same engine.
If you are losing oil pressure, or appear to be, I strongly suggest the fitment of a mechanical Master Oil Gauge, and verify the truth. The electrical sender units are well known to do odd things, as are the instrument units of the dash cluster.
Oil viscosity has a small affect on pressure, but not much.
This is Parts drawing of the oil filter housing, showing the factory by-pass elbow as #4.
When time permits, please do an Intro in the New Members Area.
The oil cooler by-pass was a factory thing.
Not many markets got the cooler on the 6 cylinder.
My X300 3.2, and the X300R (Supercharged), do NOT have it in our market, and we are a tad hotter than the UK. Different body, I know, but same engine.
If you are losing oil pressure, or appear to be, I strongly suggest the fitment of a mechanical Master Oil Gauge, and verify the truth. The electrical sender units are well known to do odd things, as are the instrument units of the dash cluster.
Oil viscosity has a small affect on pressure, but not much.
This is Parts drawing of the oil filter housing, showing the factory by-pass elbow as #4.
Last edited by Grant Francis; May 31, 2017 at 09:41 AM.
Veteran Member
Joined: Dec 2014
Posts: 1,892
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From: California
Someone please correct me if I'm wrong, but I think the oil pressure sending unit on a '93 4.0L is the #JLM20791 type, which is really just a binary switch. It is either 'on' or 'off' so it couldn't indicate any reduction in oil pressure other than zero.
You may have another issue, like a heat related wiring fault that is interfering with the signal to the gauge.
You may have another issue, like a heat related wiring fault that is interfering with the signal to the gauge.