W463 engine temp when off roading

5 replies [Last post]
RichS2891
RichS2891's picture
Offline
Joined: 19.07.2014
Location: North West, UK
GWOA Groups: Members

Been off roading this weekend in my 300GE swb, was really happy with how well and how easy and how comfortable it is to off road,  compared to say my Mitsubishi Shogun.

Managed to show the 2 Defender and 2 Discoverys the advantages of difflocks in a couple of washed out sections of Busk Lane. Apparently made it look too easy and undramatic, with no spinning wheels and waiting for electronics to sort them selves out ! Even funnier considering my G is 24 years old and the much older than the other 4x4 there. 

What I did notice that the temp gauge which normally sits around 87 degrees, in normal driving, but when off roading and slow uphill sections especially when in low  it was slowly creeping up to about 110 degrees.

Looking at this post does suggest mine may have the wrong thermostat fitted 

http://www.gwoa.co.uk/content/g300-thermostat

It would drop happily as soon as got back on the tarmac and got some air flowing through the radiator. Never once overheated but a bit of a concern.

Anyone else noticed this temp increase ?  Or is it the norm for the G ?  User manual suggests its OK but still a worry

Would it be worth getting the thermostat swapped for the 92 Deg one and radiator check for any blockages ? 

 

 

 

JASONGDS
JASONGDS's picture
Offline
Joined: 15.07.2011
Location: High Peak
GWOA Groups: Members
Re: W463 engine temp when off roading

Could you hear the vicous fan cut in? Mine only got above the middle of gauge in Spain off road, up prolonged mountain tracks, but never over heated . Probably worth investing in a infa red thermometer, (£10 off eBay) and checking radiator but you a few months to worry before the heat of the summer

RichS2891
RichS2891's picture
Offline
Joined: 19.07.2014
Location: North West, UK
GWOA Groups: Members
Re: W463 engine temp when off roading

Thanks for the reply, will get an an infra red thermometer to check,

I didnt notice / hear the viscous fan kick in, will have to double check that, pretty certain it did as the temp guage seem to drop a little. As its didn't go into the red I'm guessing its OK ?

Arnie
Arnie's picture
Offline
Joined: 12.04.2004
Location: London
GWOA Groups: Committee, Members
Re: W463 engine temp when off roading

Yes, the viscous fan coupling wears out and then the fan still spins but with a lot of slip. That's your most likely cause, as already mentioned above. The issue is not so noticeable when idling, but  at higher RPM it won't spin as fast as it should. You can get the OEM (Sachs) part from Euro Car Parts a little cheaper than the dealer (about £120, last time I looked).

The Thermostat on The G was uprated to a higher temp, 92C, from the more common 87C. I think this was done to get the engine warmer more quickly and reduce emission. 

Also, check that your radiator core is not blocked with mud, particularly if you have air-conditioning, where the condenser is sandwiched with the radiator, and dirt will accumulate between the two.


Just checked. The ECP price is £111, but the part offered is Behr Hella (made in China)

https://www.eurocarparts.com/search/206220270​

 

 

 

 

G-Restorations
G-Restorations's picture
Offline
Joined: 07.04.2011
Location: Lytham st Anne's, Lancashire
GWOA Groups: Committee, Members
Re: W463 engine temp when off roading

You should hear the viscous fan all the time, switching in and out.

You should here it when you firsts start up and drive off, whether the engine is hot or cold.

Gordon

RichS2891
RichS2891's picture
Offline
Joined: 19.07.2014
Location: North West, UK
GWOA Groups: Members
Re: W463 engine temp when off roading

Many thanks for the replies and the part numbers for the sachs and the Hella, I will get the parts ordered after checking with my mechanic