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Craig Jones

Member Since: 06 Mar 2016
Location: Bristol
Posts: 3

1994 Defender 110 300 Tdi CSW Auto Alaska White

300TDI getting warm too easily....

Hi all.

I have a 300tdi that is a little prone to getting warm. Partly i know this is down to my setup (auto cooler and ic in the way of rad)

its a 300tdi auto in a 110 with roof rack, full cage etc, so heavy and loaded so to speak.

The engine is a full rebuild from a chap based in clevedon, but he did miss a few bits when he did the rebuild, so i now have to question everything. no overheating prior to rebuild, but no indication of any issues such as head gasket etc.

When it came back from rebuild it was way down on power, and some research found that lots of restoration places turn the pump down a little to wear it in nicer) I did a slight pump tweak and that resolved those issues after i did over 1000 miles.

I am interested in fitting an 82c stat, as it currently has the 88c stat, and my electric fan kicks in at the same time making for a non ideal setup. on a long hill she can reach 100 and i don't like that. at the same time, when simply reversing after a drive the fan kicks in and she tries to go to 95 sometimes.

i have silicone hoses, a new expansion bottle and cap (the expansion bottle still makes noise once turned off but she uses no water).

I am wondering about whether the stat even works, or if the hole is at the top of the stat. i also read that the hosuing can corrode internally and allow a constant bypass. The engine prior to rebuild had all the core plugs fail or near fail due to corrosion... possibly related?

28th Mar 2016 7:52pm

Mash

Member Since: 09 Feb 2015
Location: Guernsey
Posts: 1674

The best bet would be remove the thermostat and run like that a few times to see if that is a problem, failing that there is a thin pipe that comes off the header tank, it runs to the thermostat housing and the radiator, I have seen overheating problems when this is blocked. 90 wolf - Jasmin http://www.defender2.net/forum/topic39408.html
90 V8 - Maggie http://www.defender2.net/forum/topic42564.html
110 TD5 - Buggsy http://www.defender2.net/forum/topic59029.html
52HG25 lightweight https://www.defender2.net/forum/topic72342.html
D3 Hse - Fiona
Capri 2l S - Anna

Think I might have a problem............

28th Mar 2016 8:11pm

Fatboy Slim

Member Since: 04 Feb 2008
Location: Bridgend
Posts: 1006

So how hot is it actually getting? 100degC is perfectly normal.

28th Mar 2016 8:54pm

Craig Jones

Member Since: 06 Mar 2016
Location: Bristol
Posts: 3

I can get her to 100c on a long climb, but I thought they should run at 90, and always try to keep under 100?

Assuming I have that wrong, what's the max, ideal etc?

28th Mar 2016 10:52pm

MuddyChris300tdi

Member Since: 02 Mar 2014
Location: Derby
Posts: 224

1995 Defender 130 300 Tdi HCPU Alpine White

I'm just looking into why mine seems to be running hot. On a run mine sits just under the red.

Click image to enlarge
I'm going to try a new sensor and then take the stat out. Then I think it will have to be a new rad.

4th Apr 2016 6:33am

Mash

Member Since: 09 Feb 2015
Location: Guernsey
Posts: 1674

Never seen a gauge like that before. 90 wolf - Jasmin http://www.defender2.net/forum/topic39408.html
90 V8 - Maggie http://www.defender2.net/forum/topic42564.html
110 TD5 - Buggsy http://www.defender2.net/forum/topic59029.html
52HG25 lightweight https://www.defender2.net/forum/topic72342.html
D3 Hse - Fiona
Capri 2l S - Anna

Think I might have a problem............

4th Apr 2016 10:49am

Tompoole

Member Since: 05 Jun 2011
Location: Bucks
Posts: 827

If it's a tdi it will need a stat in it so you'll need to jam it open as opposed to
Running without one Have fun be happy

4th Apr 2016 10:55am

Mash

Member Since: 09 Feb 2015
Location: Guernsey
Posts: 1674

I have run a few 300tdis without thermostats in various countries as the need has arisen. 90 wolf - Jasmin http://www.defender2.net/forum/topic39408.html
90 V8 - Maggie http://www.defender2.net/forum/topic42564.html
110 TD5 - Buggsy http://www.defender2.net/forum/topic59029.html
52HG25 lightweight https://www.defender2.net/forum/topic72342.html
D3 Hse - Fiona
Capri 2l S - Anna

Think I might have a problem............

4th Apr 2016 11:02am

g-mack

Member Since: 07 Jan 2014
Location: northumberland
Posts: 1967

mine runs at 72deg when warm, on a hot day that can climb to 76deg. that is actual head temp though not water temp! i have no idea what the water temp is!! My 109 thread

my youtube channel

4th Apr 2016 1:13pm

gazman

Member Since: 17 Aug 2015
Location: Liverpool
Posts: 652

with a water temp like that you must have one of only a few 200/300's with a warm heater! 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r

4th Apr 2016 3:04pm

Dave T

Member Since: 07 Jun 2013
Location: Glasgow
Posts: 490

Mine runs mid scale and is roasting, just needs adjusting properly, found a few others like that as well 2015 RRS Autobiography SDV6
1994 Def 90 300tdi

4th Apr 2016 5:41pm

MuddyChris300tdi

Member Since: 02 Mar 2014
Location: Derby
Posts: 224

Well I did an 8 mile drive today at mixed speeds and the needle sat bang on 90c. When I stopped I checked the top and bottom rad hoses. There both hot i can touch them for about 5 seconds the bottom hose that goes to the header tank is stone cold. I'm leaning towards it needing a new rad. And the heater is red hot. Doesn't help that the adjuster needs adjusting. It's either hot or cold.

4th Apr 2016 7:11pm

Fatboy Slim

Member Since: 04 Feb 2008
Location: Bridgend
Posts: 1006

You've lost me. 88-90degC is exactly where you want it to be running. Overcooling is not good for an engine you certainly don't want it running any cooler than 82degC.

4th Apr 2016 8:09pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20359

IIRC 88C is the benchmark usually.
I've noticed on mine since coolant change a slight drop in running temp which is good, but only a tiny drop.

But mine is a 2.4, I assume they should all be similar though.

4th Apr 2016 8:13pm

MuddyChris300tdi

Member Since: 02 Mar 2014
Location: Derby
Posts: 224

My previous post showed gauge just in the red, and it will sit there on a go run. Today was a short run at lowish speeds. It was more finding that the bottom hose was as hot as the top hose. I expected a noticeable difference between the two.

4th Apr 2016 9:48pm

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