75 ser 4.2 turbo troopy o/heating

[willylil]

HI
75 ser troopy 53000km only, as new with coolant changed every 2 years. Fitted garret water cooled turbo /7.5 boost with fuel boost compensator and larger exhaust in nov last year. Vehicle has been perfect until hooked 2 ton unladen caravan on, and on very steep slow incline the gauge went to red near top/ 3r gear at approx 55km. Once overy hill gauge dropped very quickly to normal then for next 50km on bruce highway even on moderate hills at 80km temp did not vary from normal even with heavy throttle to try to increase temp. The problem seems to be airflow, fan does not have a lot of resistence hot or cold so was going to check and add oil but should i fit 4 core heavy duty radiator as well. Origonal radiator is perfect condition and coolant has always been clean when flushed. Cheers Willylil

[baby_troupe]

7x series Troopies do suffer from airflow problems.
I would start with the oil for the fan first, but if you plan on towing, a larger radiator & even look at bonnet ventilation to be able to get more air circulating.

[tuff 75]

same thing happend 2 me in my old 75. i done everything and all it ended up being was the radiator needed flushing out and cleaned... pull trhe radiator out and take 2 a bloke 2 pull the tanks of it and flush it out..... i

[firetruck]

I have the same problem in my 75. It gets hot on a long hill in 3rd gear. Its ok in 2nd or 4th. Mine has done 58000kms and all components are like brand new. I have replaced the thermostat as a precaution and also put a new fan clutch in cause the fan was a bit lazy. I tried the oil on my old turboed hj47 but you need to get it exact or the fan locks solid and runs all the time. This made the problem better but still hasn't fixed it. I can't hear the fan working when it gets hot. These fans work by sensing heat on the front of them which makes me think its an air flow problem. I have heard that Toyota had a problem with fan clutches on landcruisers around this era. I'll keep you posted on my success.

[whyallacookie]

It's probably worth getting the radiator rodded (They effectively clean every single tube, even though they "flush" clean there can be junk restricting flow and heat transfer. Also could be lots of little bugs cooked between the fins.

You save a heap if you are able/willing to pull the radiator out yourself and reinstal it.

[willylil]

HI
Have fited larger non genuine 4 core radiator and added 1and a half tubes of silicone oil to fan hub. will post results when caravan is returned from repair re hail damage as unless i tow the temp does not move from normal. The radiator fitted now is also compatible with the 78 series which has the larger one fitted as standard. cheers willylil

[Terrano-saurus]

This will likely sound very strange unless you have a good understanding of turbo charged diesel engines, take it to a diesel dyno tuner get them to increase the boost to at least 10 psi but preferably 12psi and also get them to reset the air fuel ratio, also check the usual things, air cleaner, exhaust restriction (restrictive muffler), then look at the water coolant if you still have a problem. Dyno tune and adjustment is normally around $165.00 plus maybe $45.00 for a turbo controller if they need it to adjust boost psi

[willylil]

Have previously fitted larger diam/exhaust and flow through muffler and air/cleaner is new. willylil

[super75]

running a snorkel on there mate? and how much blach smoke are you churning out under load? the fuel ratio may be slightly high... the 75's are well known for getting hot under load with a turbo.... radiator was a good move

[DesertCruiser]

Had same over heating dramas, these are some of the things I did trying to solve the Up in the RED heating problems.
1. Check Radiator hoses are good, if their a bit old, while under revs, the water pump sucking the water through the bottom hose can cause the sides to suck together thus letting little water through, you stop get out and check, hose is normal again. Are your hoses soft? then change them!

2. Fan clutch, Gently lean a bit of broom stick against your fan (go with the flow, or the shit WILL hit the fan and radiator) apply a bit of presure, if the fan stops or slows, your centre clutch is stuffed. Do when your motor is hot at temp. ( the Dyno blokes showed me)

3.I put in a 3" Exhaust. Better air flow for a turbo.

4. Snorkle.

5. I was told by the dyno boys to remove my Finer Filter Air Cleaner as this adds to extra heat. I did but it made no difference going back to the paper filter.

6.Fit an oil cooler before your turbo oil feed.

7.Remove your spotties from infront of your radiator, better air flow.

8. Fit a new 4 core hevy duty radiator.

9. Get Dyno'ed, they will check your injector pump fuel mix, Mine was a half a turn over. and they can check your timing, again mine was a bit out.

10. Change/check thermostat is ok, maybe fit one that opens a bit earlier

These ALL contributed to over heating, the big savers were,
Bigger radiator,
New bottom hose on radiator.
Fan Clutch ( ended up filling it with silastic to make it full time)
and the dyno,
PS the load of Extras we all add on dosn't help, It's either wind drag or extra weight, I have nearly all the extras I can think of, it costs me arround 150km in fuel to have these toys, but both of these Contribute to heat as well.
Mine used to run at 3/4 to red all the time, got worse with my additions, all the above helped in their own way to reduce the heat, I now sit with a steady temp of halfway, that with the trailer on.
Hope this helped.

[HJ 47 CHEV]

Hi Willylil.

my mate had issues with over heating also. not from towing like yourself.

changed or service radiator cant remember. but still no change.

replaced the clutch fan, solved the problem.

maybe try that.. ????? i think from memory round the $150 mark.(but dont quote me)

Good luck RICHO

[CHMS]

Was the vehicle ever retuned by a diesel shop after the turbo was fitted? You need to have your EGT's (exhaust gas temperature) checked. If there is too much fuel the temps can be way too high under load and you can start melting pistons etc. I would be very surprised if there are any issues with your cooling system at such low mileage, though you never know i could be wrong!

[willylil]

Hi All.
Have just completed nearl 5000km towing 2000kg offroad van. I have fitted vents to bonnet, same as rear side vents. But with larger 78 ser non genuine radiator the temp gauge did not move off half. The gears must be used when towing even though vehicle would pull strongly up hills in 3rd the temp pyro gauge will kreep up so i find you tend to drive by this gauge. Very happy with performance now.
Cheers willylil