75 series getting hot

Submitted: Friday, Apr 13, 2007 at 21:53
ThreadID: 44288 Views:3925 Replies:9 FollowUps:6
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Hi all,
maybe some one can offer an answer as to why my mates 75 series 2F diesel
gets hot when you push it over 100kph ,only recently it had the cylinder head
reconditioned new t/stat ,new radiator ,injectors done .
It doesn,t use water, the temp gauge goes up and so does the engine temp
if you slow down the gauge drops back to normal , seems to be a circulation
issue !!! the viscous fan hub is new , any ideas will be appreciated .
cheers mechpete.
ps the gauge goes way up .
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Reply By: Member - Stephen M (NSW) - Friday, Apr 13, 2007 at 21:57

Friday, Apr 13, 2007 at 21:57
Did you have the pump done at the same time ?? You say injectors but nothing about the pump, if this is not set right it will cause this problem. Regards Steve M
AnswerID: 233233

Reply By: Member - Stephen M (NSW) - Friday, Apr 13, 2007 at 22:05

Friday, Apr 13, 2007 at 22:05
Also what brand of viscous hub did you use. I ahev heard of certain after market brands not locking in properly. Some people are under the impression that at 100k's it wont need to lock in but if the weathers hot enough it will. When you had radiator done did you clean out any crap mud etc that might have built itself up in the air con condensor. Did you have the same problem prior to doing your mentioned work or has it been since your mate has had it done ?? Can you actually hear the clutch fan cut in when the temp starts to rise. Another way to test is get it up to the point of the gueage rising and gets quit warm then pull over quickly and pop bonnet and grab hold of throttle cable and rev to about 2g's and the fan should be roaring its nut out. I had this issue with my old VL commodore and even after fitment of new coupling still had the same issue every now and then turned out to be a faulty after market clutch viscous so bought a genuine one never had another problem after that. Regards Steve M
AnswerID: 233234

Follow Up By: Member - Stephen M (NSW) - Friday, Apr 13, 2007 at 22:07

Friday, Apr 13, 2007 at 22:07
Geez I need to use spell check tonight shocking !!! Long day.
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Reply By: Member - Doug T (W.A) - Friday, Apr 13, 2007 at 22:09

Friday, Apr 13, 2007 at 22:09
I would be trotting off to the spare parts shop and getting a new Thermostat. I had one seize up once and had to pull it out on road , took the gutz out of it and put it back , went through the whole process the next day when I got a new one , and make sure you get genuine , easiest way I found to get at it was drop the A/C comp' off and lay it back over near the washer bottle, then loosen the Alternator and lean it forward then you can get a clear go at it, and don't loose the rubber washer , if you don't get a new one re use it , it is the seal.
Have fun

Doug
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AnswerID: 233237

Follow Up By: Member - Stephen M (NSW) - Friday, Apr 13, 2007 at 22:31

Friday, Apr 13, 2007 at 22:31
Hi there Doug going by his description he has put a new one in. I think "t/stat" is referring to thermostat unless thats short for some thing else. Maybe ?? I'm like you I only use genuine parts, always have.To much envolved to buy cheap sh#t then when it causes other isues its not worth the headache. I know there is a huge difference with the clutch couplings. My lux was $340 that was my price davis craig $130 but was informed by the guy at the spare shop who was actually selling the davis craig to go genuine he had too many of them coming back not working or only working when they wanted to. The partnumber for the davis craig fan for the lux also fitted some other model hilux's and even cruisers, yet when I rang Toyota there was different part numbers for each other vehicle so that tells me that davis craig are making a universal type one to suit a different range of vehicles. I know there are plenty of people on here and some of my mates who cant afford to buy genuine and have had no problems but I'm a fussy prick. Regards Steve M
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Follow Up By: Member - Doug T (W.A) - Friday, Apr 13, 2007 at 22:35

Friday, Apr 13, 2007 at 22:35
Silly old bugger i am eh , I didn't see that T/stat , but ..... sometimes a new non genuine part might not last long as I found out with 2 water pumps in 14 months and the original lasted 9 years
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Follow Up By: Member - Stephen M (NSW) - Friday, Apr 13, 2007 at 22:51

Friday, Apr 13, 2007 at 22:51
Very true Doug, I found that out with lux's centre bearing on the tailshaft had been on there 16 years put non genuine on off ebay lasted 12months and had to replace again guess what I used the last time ?? "Genuine" double the price but obviously for a reason, still was fine when I sold it. Regards Steve M
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Reply By: MintabiePete - Friday, Apr 13, 2007 at 22:26

Friday, Apr 13, 2007 at 22:26
If I run my HJ75 with 2H engine over 100 kph with the air con going it raises the temp . If I turn off the air con , it drops back to normal . Running it without the air con going I can sit on 100 kph all day at normal temps with no problems :)
AnswerID: 233243

Reply By: hiab - Saturday, Apr 14, 2007 at 00:32

Saturday, Apr 14, 2007 at 00:32
why are so many people pushing genuine parts? most toyota parts come from the same place. there is NO advantage in genuine parts. shock horror!!! i know it is different up here, but when we fit thermostats we cut the guts out of it. it works. but no good down in the cold.you have covered all bases, the injector pump timing cant move. sometimes the gauge just reads high.
AnswerID: 233257

Follow Up By: obee - Saturday, Apr 14, 2007 at 20:38

Saturday, Apr 14, 2007 at 20:38
I remember when we used to throw the thermostat away first time it stuck but then I learned that they put them there for a reason. The sooner the motor gets up to the correct temperature the sooner all the clearances will be at optimum. Less wear over the life of the motor. The thermostat should keep the motor at near exactly the specified temp.

Car manufacturers dont put anything on a car unless there is a good reason otherwise they would be pushing the price up for no reason and with millions of units going out the front door that represents a healthy bonus for some exec.

owen
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Reply By: Peter 2 - Saturday, Apr 14, 2007 at 07:21

Saturday, Apr 14, 2007 at 07:21
75 series with 2H engines always ran hot if pushing past the 100kph mark, Toyota even recognised this when they fitted an extra vent to the passengers side guard and put plastic box around the battery to try and stop it cooking.
One of the aftermarket turbo mobs even put one in a wind tunnel and discovered that at 100kph there was no airflow through the radiator due to the shape of the body and the restricted space under the bonnet.
Basically I found with mine that it was best to sit around 95kph as the engine is starting to rev too hard and guzzles fuel much over this anyway.
I found that the solution was to remove all obstructions from in front of the radiator like spotties etc, make sure thermostats, cluch fan and radiator are all ok, (which you seem to have done), only use the red Toyota coolant in the correct mix(too much coolant will actually make any engine run hotter) and that was as good as it gets.
In really hot weather I found that if I used 5th it got hot, drop back to 4th with the water pump spinning harder it ran cooler. The direction of the prevailing wind will also affect it, tailwind will cause it to run hot as well, simply poor airflow.
AnswerID: 233269

Follow Up By: Bros 1 - Saturday, Apr 14, 2007 at 18:45

Saturday, Apr 14, 2007 at 18:45
Peter 2,
My 11/85 model 2H/HJ has never run hot, even sitting over the 100 mark, fully loaded with the tinny on top. 365,000 on clock (touch wood).
Got two spotties sitting in front of the radiator.
Every year i get a back flush and new inhibitor. (they use green)
Just a thought, but does the radiator bottom tank protector plate make a difference in regard to air flow?
Agree with the 95Kph being the speed that is most economical.Cheers,
Bros.
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Reply By: Member - Tour Boy- Saturday, Apr 14, 2007 at 07:41

Saturday, Apr 14, 2007 at 07:41
Hi the gauges arent much good after a few years, put an aftermarket one in so you can see the real story.
You can lift the back of the bonnet up using 3 washers on the rearmost bolts on the hinges to allow more air flow.
By the way it is a 2H the 2F is petrol.
Regards
Tour Boy
Cheers,
Dave
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AnswerID: 233272

Reply By: Member - DOZER- Saturday, Apr 14, 2007 at 21:30

Saturday, Apr 14, 2007 at 21:30
radiator or thermistat. 2f diesel hey....well i cant blame you for thinking it is a diesel, the 2f is a petrol and the 2h is diseasal....
AnswerID: 233431

Reply By: Transient - Sunday, Apr 15, 2007 at 01:17

Sunday, Apr 15, 2007 at 01:17
If your radiator hoses are old replace them.

The bottom one can end up being so soft it sucks itself thin and contricts the flow of coolant, especially on long slow uphill gradients.
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