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Mo Murphy

Member Since: 01 Jun 2008
Location: Letchworth Garden City, Herts
Posts: 2244

1984 Defender 90 BMW M57 3.0 Diesel HT Auto Pennine Grey

My thoughts would be to start with the thermostat. It's the cheapest and easiest bit to change. Replacements are hit and miss, even genuine so test in hot water with a thermometer prior to use (I've had duff genuine and waxstat).
Eliminate the simple things first and don't always assume the worst.
HTH
Mo The Land Rover 90 - Many are called, few are chosen.

50 Shades of Pennine Grey

30th Nov 2018 11:15am

OJ

Member Since: 23 Nov 2018
Location: North of Edinburgh
Posts: 121

2015 Defender 90 Puma 2.2 XS CSW Corris Grey

Buz wrote:
Thanks everyone for the great input.
The rad was replaced within the last 3 years so I would hope it isn't furred up (yeah, I know it could be)
The thermostat was changed also about 3 years ago, I'm guessing it was the only one the guy had available at the time, rather than an 82c being used for a specific reason.
The bottom of the rad goes from warm/hot to virtually cold at intervals, so I'm assuming this is the thermostat opening/closing and making the temp difference.
I think the next plan is to drive it, carry spare water with me, check levels often, if the gauge starts to go up, use the IR meter to see where any hot spots are.

Hi Buz
How did you get on ? Any update

5th Dec 2018 7:37pm

NickMc

Member Since: 01 Oct 2014
Location: Norn Iron
Posts: 1628

I agree with JST just because it’s new doesn’t mean it’s good. Very easy to remove and test it too.

7th Dec 2018 12:48am

Buz

Member Since: 24 Jan 2014
Location: Forest of Dean
Posts: 238

1987 Defender 90 200 Tdi HT Barolo Black

OK, I have changed the thermostat and the sensor in the thermostat housing.
Temp gauge is still going into the red, even after a short run but doesn't stay there, it seems to fluctuate. I checked the temp of the thermostat housing and it was only showing about 40c on the IR reader.
I have noticed the PAS pump squeals, especially when driving through water or on full lock. I originally thought it was the Alt squealing but I tightened the belt today and then none of the belts would move (evidently too tight) if I moved the belt by hand the pAS pump could be heard to squeal. I loosened the alt belt off slightly, and the belts worked ok but the alt was only putting out 13v as apposed to its usual 14.4v (it did occasionally kick out 14v so I assume the alt is ok!!)
I'm now wondering if the PAS pump is seizing/running tight and slowing the water pump and alternator down?
.
The joys of owning a Defender, its certainly a steep old learning curve

10th Dec 2018 6:35pm

Les Brock

Member Since: 20 Mar 2012
Location: Stroud, Glos
Posts: 152

Bad earth/ground on the block ?

10th Dec 2018 6:45pm

Buz

Member Since: 24 Jan 2014
Location: Forest of Dean
Posts: 238

I hadn't thought of that, assumed it would have thrown up other issues if a bad earth but worth checking....thanks

10th Dec 2018 6:48pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8051

2011 Defender 110 Puma 2.4 USW Stornoway Grey

the IR is showing it at 40deg on the housing as before. shes not smelling hot or loosing water.

I still maintain an electrical fault, does the temp gauge fluctuate with Alt output? Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

10th Dec 2018 7:28pm

Buz

Member Since: 24 Jan 2014
Location: Forest of Dean
Posts: 238

I haven't checked but I dont think it does, another thing to check though.
I assume the resistance changes as the temp goes up, maybe I'll have to check resistance once when the meter is up in the red, or just invest in a replacement temperature gauge

10th Dec 2018 7:33pm

c18rch

Member Since: 28 Nov 2012
Location: Sheffield
Posts: 28

1988 Defender 110 200 Tdi HT Keswick Green

c18rch wrote:

If it is not actually getting up to temp, it is the sender or the guage. I had a bad earth on the temp gauge which made it look as though it were overheating. Engine wasn't even warm.

Exactly the same as the sypmtoms I had. Bad earth on the gauge. Measure the temp at the sender. If that is not hot then the problem has to be electrical. If it is not the gauge, it is the sender. 1988 110 200TDi Hard Top

11th Dec 2018 2:00pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8051

have said that for a while! housing is 40deg on IR, gauge shows red hot! that to me says electrical fault too. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

11th Dec 2018 2:11pm

Buz

Member Since: 24 Jan 2014
Location: Forest of Dean
Posts: 238

I assumed it would have been electrical but didn't want to push my luck and cook the engine. I'm still very much a novice with the DIY stuff on the Landy.
The binnacle is loose (I have a replacement piece it attaches to as the old one broke). I haven't checked the dial end yet, I was working my way back from the thermostat/sender. I'm also finding it awkward to get time out to look at it due to family issues, hence why its been dragging on so long...
Dial check next it is then

Thanks for all the input guys, it is really appreciated.

11th Dec 2018 2:49pm

OJ

Member Since: 23 Nov 2018
Location: North of Edinburgh
Posts: 121

If you take the wire off the sender unit at the thermostat and with the ignition on touch the wire to earth, if the guage goes all the way up its probably ok, you could replace the sender unit just to be sure,

Edited to now show correct link, two types of thread available ,

https://www.steveparkers.com/product/spck2...r-200-tdi/

https://www.steveparkers.com/product/spck2...mp-sender/

OJ

Last edited by OJ on 12th Dec 2018 6:59am. Edited 1 time in total

11th Dec 2018 5:51pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6610

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

That's not the right sensor for a Disco 200 Tdi in a Defender.

The right one is PRC6663 (as in my first reply)

1988 90 Td5 NAS soft top

2015 D90 XS SW

11th Dec 2018 8:43pm

Buz

Member Since: 24 Jan 2014
Location: Forest of Dean
Posts: 238

Martin, you are correct. I had to fit a Defender 200tdi sender in mine as its a Defender temperature gauge.
Ive changed t he sender and thermostat by the way, so looking electrical as others have said earlier

11th Dec 2018 8:46pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6610

PRC6663 is a Defender sensor (late 2.5TD/NA/Petrol) but it directly fits the Disco 200 Tdi

1988 90 Td5 NAS soft top

2015 D90 XS SW

11th Dec 2018 8:50pm

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