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charcoal



Member Since: 28 Jul 2014
Location: Hampshire
Posts: 897

United Kingdom 1999 Defender 110 Td5 SW Alpine White
12j engine oil overheating
Hello all, so my dads ex mod 110 with the 12j engine has overheating oil, to the point where it is in the red on the gauge. I took it for a 30 minute drive to see if it was an anomaly and it was going up to the point it was almost in the red again. There is no oil pressure light and when checking the dipstick it is at the correct level, maybe even a little high. Any ideas? 1999 Land Rover Defender 110 td5 station wagon
1998 Land Rover Defender 110 County Station Wagon ~ Sold
1995 Land Rover Defender 110 V8 Station Wagon ~ Sold Sad
1985 Land Rover 110 ex mod project Tithonus ~ Sold Sad
Post #979393 23rd Jan 2023 4:19pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 2347

Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
12J does not have oil cooler.
When you say that gauge is on red zone, do you mean there is an additional gauge for oil temperature apart from the standard coolant (water) temperature? 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #979401 23rd Jan 2023 4:46pm
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geobloke



Member Since: 06 Nov 2012
Location: North Wales, UK
Posts: 2952

United Kingdom 
As above. I suspect you are talking about the coolant temperature gauge, right?

What sort of driving are you doing when it is overheating? Low speed around town, off road, fast road... or at least as fast road as a 12J can do Rolling Eyes
Post #979405 23rd Jan 2023 5:03pm
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v8bob



Member Since: 14 Mar 2018
Location: Midlands
Posts: 275

United Kingdom 1998 Defender 90 300 Tdi HT Nato Green
A lot of ex mod - as mentioned in the post - have oil temp gauges.
Assuming you are talking oil temp high.
What is the coolant temp gauge doing?
Does it have any mods?
For info - high rpm low load, normally gives high engine oil temp.
And high load low engine rpm, normally gives high coolant temp.

As a quick check, you could see if it feels hot when you stop.
Below about 60 dec C you can hold your hand on the oil pan for a bit, much above you can’t.
Post #979407 23rd Jan 2023 5:21pm
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charcoal



Member Since: 28 Jul 2014
Location: Hampshire
Posts: 897

United Kingdom 1999 Defender 110 Td5 SW Alpine White
No so this 110 is fitted with an oil temperature gauge as well as a coolant one, the coolant one is in the middle as if nothing was wrong. The driving was low speed around town, no mods. That's good to know I guess with the 1.6 transfer box it could be considered high rpm low load although I like to get it into 5th as soon as possible to minimise revving the Censored out of it. I didn't think to try touching the sump actually, got a laser thermometer so can get it up to temp again and try with that. 1999 Land Rover Defender 110 td5 station wagon
1998 Land Rover Defender 110 County Station Wagon ~ Sold
1995 Land Rover Defender 110 V8 Station Wagon ~ Sold Sad
1985 Land Rover 110 ex mod project Tithonus ~ Sold Sad
Post #979417 23rd Jan 2023 5:55pm
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v8bob



Member Since: 14 Mar 2018
Location: Midlands
Posts: 275

United Kingdom 1998 Defender 90 300 Tdi HT Nato Green
When up to temp, check sump temp and oil filter temps. It will give a better idea of how the circulation is.
Then you can decide if it is just a gauge/sender issue.
Post #979425 23rd Jan 2023 6:18pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 2347

Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
Apologies, missed the mod part. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #979444 23rd Jan 2023 7:24pm
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diesel_jim



Member Since: 13 Oct 2008
Location: hiding
Posts: 5627

United Kingdom 2006 Defender 110 Td5 SW Epsom Green
Check the earth on the oil temp guage.... that can make the guage go right up to the "right" (hot)

Of all the military rovers I've driven and ragged around, never had the oil temp move at all from the mid point so I'd think something electrical was amiss.
Post #979501 24th Jan 2023 6:34am
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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 97

France 2002 Defender 110 Td5 DCPU Chawton White
Just because the gauge reads high does not mean the temperature is necessarily high. It normally takes much longer for the oil to heat up than for the cooling system. With your cooling water gauge showing normal if would be very odd to have overheated oil after such a short and gentle drive.

It's funny though how seeing a wrong gauge is unsettling. My Td5 had a earth fault when I got it and the gauge would read high... well it would when the AC was on. Just flipping the AC on and off would make the gauge jump. Even though I knew the temperature was good, seeing that gauged pegged at hot made you worry. Quickly fixed in my case by retracing and repairing the faulty earth wire.
Post #979502 24th Jan 2023 7:11am
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charcoal



Member Since: 28 Jul 2014
Location: Hampshire
Posts: 897

United Kingdom 1999 Defender 110 Td5 SW Alpine White
Thanks for the input everyone, I'm not familiar with these engines can anyone say where the sensor is? I did check the temperatures though and after about an hour of driving it climbed to just above the 3/4 mark and didn't really seem to go further in the last 20 or so. The temperature at the sump was 72.7c and at the oil filter housing it was 64c so do we think that is enough of a difference to warrant a circulation problem? 1999 Land Rover Defender 110 td5 station wagon
1998 Land Rover Defender 110 County Station Wagon ~ Sold
1995 Land Rover Defender 110 V8 Station Wagon ~ Sold Sad
1985 Land Rover 110 ex mod project Tithonus ~ Sold Sad
Post #979586 24th Jan 2023 3:36pm
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v8bob



Member Since: 14 Mar 2018
Location: Midlands
Posts: 275

United Kingdom 1998 Defender 90 300 Tdi HT Nato Green
Most of the mod ones have oil coolers (mine is in the rad), if the coolant isn’t too hot, then that may well be about right. I don’t expect the coolant thermostat will be fully open in the current ambient temps. Probably should have suggested checking your coolant temp - bottom of rad temp with your laser thing.

I don’t know where the oil temp sender is my my mod na, but it is by the filter on my V8, not mod though.
My na runs with the oil temp gauge just a bit higher than the coolant temp, from memory. When my speed is dropping on a long gradient, then the oil temp does go up a little, never seen it higher than 3/4.

I can have a look tomorrow to see where my oil temp sender is….
Post #979613 24th Jan 2023 6:09pm
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roel



Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2034

Netherlands 2003 Defender 90 Td5 PU Caledonian Blue
I would do a compression test. De engine of my first 90 was really worn. It ran fine but after a high way trip the oilpressure light would flicker when running stationary. I think the oil temp was high as after a short while it was OK again.
The water temp was always fine. Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)
Post #979627 24th Jan 2023 7:15pm
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Linds Hanson



Member Since: 16 Jan 2021
Location: Cornwall
Posts: 236

United Kingdom 
There is a thermostat in the oil filter housing cooler outlet. Oil temps do get quite high when working hard I had a 19j in a lightweight and the oil temps did get quite worrying at motorway speeds even with military cooler
Post #979704 25th Jan 2023 10:33am
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v8bob



Member Since: 14 Mar 2018
Location: Midlands
Posts: 275

United Kingdom 1998 Defender 90 300 Tdi HT Nato Green
It looks like the oil temp sender is on the oil filter housing, by the oil cooler pipe. And the oil pressure light switch is in the really awkward place behind the injection pump. I presume they are that way round.

You mentioned at the beginning no oil light! Is that the case? I think I would prioritise getting the oil light working if it doesn’t work.

Next time you take it for a run you could compare temps on the oil cooler pipes as well.

What year is the vehicle and what mileage? My vehicle is a 93 with about 30,000 miles on it.
Post #979761 25th Jan 2023 4:37pm
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