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  #1  
Old July 16th, 2016, 10:34 PM
Roverlab
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Trevor Griffiths
66 109, 85 110, 92 RR, 06 LR3
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200TDi oil pressure issue

Noticed this a few weeks ago and am just getting around to doing something about it. At idle warm, oil light started to flicker. Raise speed ever so slightly and goes out immediately. Connected a test gauge: 8 psi at idle, increases to 35 without much rpm (don't know exactly how much rpm). Odd thing is this: holding steady increased rpm, or even just above idle, oil pressure reading will rise up about 8 psi and then come back down. Pressute goes up and down smoothly, and seems like same rate even at a higher engine speed.

Thoughts?
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  #2  
Old July 16th, 2016, 11:09 PM
Naplm00
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Matthew
1983 110 200tdi 3 door soft top
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This is exactly what mine would do before it nuked the bottom end....if you can pull the fuel pump plate and the other side cover plate and check to see if any of the cam bearings have walked out of thier journals.

Also check the turbo for possible leaking seals.

I thought I had a bad oil pump and replaced it only for it to nuke about a month later.
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  #3  
Old July 16th, 2016, 11:35 PM
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John B.
1991 Defender 90, 200TDI
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Can bearings or worn main bearings or oil pump. I don't think anything else would hurt pressure. Turbo seals would not matter as the oil is restricted before the bearings.
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  #4  
Old July 17th, 2016, 08:33 AM
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Skinny Pete
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Trevor it almost sounds like a malfunctioning oil pressure release valve. That might be worth checking before going to far with a teardown.
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Present:
1960 SII 109"- "Red Square"
1984 90 Tdi- "Yamelo"
1988 RRC- "Chewbacca"
1987 RRC- "Chewy 2"
2008 RRS SC- "The Supersofa"

Past:
1959 SII 88"- "The Little Green Beastie" last seen in NY
1972 SIII 88"- "GreenHELL" now in NC
1988 90 "Eric the Half a Bee" half a truck, sold for parts
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  #5  
Old July 17th, 2016, 08:44 AM
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Chris
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Had a mini that would do the same thing.
Think the ideas you have been given are great. We also dropped the pan and found the pick up partly blocked.
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  #6  
Old July 17th, 2016, 10:25 AM
Roverlab
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Trevor Griffiths
66 109, 85 110, 92 RR, 06 LR3
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Fitted a new crank and bearings about 4 years and maybe 5000 miles ago- extensive damage due to 2 loose crank pulleys prior to coming to my shop.
Did not replace cam bearings at that time- there is a longer backstory that drove that choice- and I believe the engine was a used unit with unknown mileage. Refresh my memory, a low turbo is a 90/110 and a high turbo is Disco?
Just returned from a trip to Yellowstone- in a LR3, not the 110-, so will get a chance to look into the oil pressure relief this week.....

------ Follow up post added July 17th, 2016 10:26 AM ------

As always, thanks everybody for the input!
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  #7  
Old July 17th, 2016, 10:33 AM
Naplm00
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Matthew
1983 110 200tdi 3 door soft top
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Low turbo is disco, high turbo defender
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  #8  
Old July 17th, 2016, 10:35 AM
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Neil Steinhagen
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Generally, a low turbo is a Disco and a high turbo is a Defender but these can be reconfigured with different manifolds.

Best way to tell:

11L - Defender 200Tdi
12L - Disco 200Tdi with manual gearbox
13L - Disco 200Tdi with auto gearbox
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