Overheating

Hi Colin

I have come across this issue before, it would pay to get a run on a dyno and check the fuel air ratio and your exhaust temp. The ones I have come across in the past were all over fueling. What are you towing and what speed are you trying to do, what is the ambient temp.

Colin,

As Len said, take the vehicle to a diesel specialist. They will need to check pump timing and Air Fuel Ratios, etc. There is a tendency to advance the timing and wind up the fuel with aftermarket turbo set ups, and the 1HZ doesn't like either. 1HZ's have very thin piston crowns (compared to factory turbo engines) and they don't take much to crack. This is why I am against turboing engines that weren't designed for them. Sorry if that sounds harsh, I know I'm going to cop it for that comment!

Don't want you ending up like this: 1HZ failure

Is there excessive black smoke coming out of the tail pipe under acceleration? Also what are you towing?

Do you have a turbo gauge and EGT gauge fitted? If so, what readings do you get?

Cheers,

Tim

Get on LCOOL and all the answers will be on there Join its free and you will read for a week

Colin,
The only time my 80 series before and after I fitted a turbo was when the viscous coupling had failed. Fitted a new one and it lasted 200K kms.
I also tried refilling it with grease but only replacement fixed the problem.

I have the same but a 2005 model, mine overheats when pushed hard such as towing or driving on soft sand, other replys have given some direction already in finding faults but ultimately the problem is that the 1HZ block cannot dissipate the heat it generates, my temp gauge never moved pre turbo, held it flat for hours on end (thats why it got turboed, lol) never even moved a millimeter, climbing long pulls brings it undone, such as Cunninghams gap, Toowoomba range where there is 10% incline for kilometers and an 80 k speed limit will make it overheat when towing the 1.4 ton camper, no problems when not towing, as soon as i get to the top the guage goes back to normal position with in 1 minute, that tells me that the cooling system is working