running hot


i have a 1992 fourtrak tdx se i am having problems with it getting hot .the temperature gauge rises to the red if i drive at 70mph or when pulling a horsebox .i have flushed the radiator out and refilled and put a new thermostat in. any more ideas?

Are your radiator channels cl

Are your radiator channels clear? As this is only happening when on high engine output, I would guess that the rad. is inefficient with blocked channels or, quite possibly, the airflow is fouled by distorted vanes.

Find the capacity of the rad., block off the lower outlet, fill, and see if it matches the amount stated.

Dave with a Sporty

Dave with a Sporty

Running Hot

This may sound obvious - but I had exactly the same problem, again most noticeable when pulling a laden horsebox - and it turned out to be an over slack fan belt. The power steering belt was also found to be slack which caused a slight screaming sound when on full-lock. Tightening the belt drive pulleys completely cured both problems.

Running hot

You would be suprised how blocked your cores could be. In the process of changing motors, I removed the top and bottom tanks of my radiator to find at least half blocked or restricted to some degree. This is in spite of exclusive use of glycol coolant since the radiator was recored about 5 years ago. Flushing is not enough, that only removes the loose contamination. If you have the facilities, and are willing to attempt it, remove top and bottom tanks, then physically clean each core tube with a oil dipstick, or similar. (I used a dipstick first, then a length of stainless steel strap that neatly fitted into the tubes.) A good flush through each tube with high pressure water then air finishes the job. Check the fins between the tubes. If any are starting to crumble when touched, then its probably time for a recore. After reassembly, paint the entire radiator with black spray paint. Remove the thermostat housing and the thermostat. If your really keen, remove the water pump. Remove the block drain plug (for a 2.8 diesel it is located at the lower right rear of the block when view from the fan, under the exhaust manifold.) Check for settled grunge in there, I've had to clean behind this plug with hammer and screwdriver once, it was that blocked. The turbocharged 2.8's had the return coolant line from the oil cooler enter the block here. Give the block a good flush with high pressure water through the block drain, and through the water pump fitting. In fact, anywhere you can get water into the block, give it a good squirt. After all this, my gauge runs around 1/4, regardless of speed or load towed, and regardless of ambient temperature, which can get to over 35 deg C here. If you dont want to tackle the radiator, any good radiator repairer should be able to do the job for a reasonable price.
Running hot will most definately kill a diesel sooner or later, most probably by cracking a piston crown and skirt.
Hope this helps
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running hot

i will certainly try that it sounds about right thank you for your advice


Checkn out my comments to Mer

Checkn out my comments to Merlin 1972 under a simular heading to your problem, about possible viscous fan problems.

Any veiws expresed in this thread by me are purely from my own experience, and (sometimes) falible memory. Hope my comments help, but please don't take them as gospel.

Running hot

I have a 92 Fourtrak TDX and had a similar running hot problem, especially at higher speeds or under tow load. My vehicle is an old farmers car and was obviously very neglected. I had a lot of transmission noise and the running hot problem turned out to be the transfer box. The box had been drained to hide an oil leak before I bought it. I had the transmission and gearbox oil supposedly changed by my garage but the transfer box wasn't done. In due course I ended up stripping the main shaft in the transfer box.
To start with I tried curing overheating by flushing the radiator, changing the fan belt and checking the thermostat. At 60 mph it still ran hot and at speeds above that it got hotter still. In the end I found that the heat from the transfer box( which failed) had warped the case, cooked the gearbox oil and was cooking the engine.
Check your transfer box oil level.
On the plus side, if you are keeping your speed under 60 mph and not towing, a dry transfer box will last about 12,000 miles -Daihatsu Quality!
Needless to say I do my own servicing now.