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[Shackeng]

Thanks a lot guys, my hand is now serviceable, and sure enough, the i/c fan was not turning. Blocked with leaves and fairly stiff. I have now got it turning freely, and runs fine with 12v input. However, it still feels a little tight. I shall put back as I need it mobile, but I have ordered a new fan to go on as I feel it will only seize again fairly soon. Have to do a motorway run next week, so it will be interesting to see how the mpg has altered.

[TheBoy]

Thanks a lot guys, my hand is now serviceable, and sure enough, the i/c fan was not turning. Blocked with leaves and fairly stiff. I have now got it turning freely, and runs fine with 12v input. However, it still feels a little tight. I shall put back as I need it mobile, but I have ordered a new fan to go on as I feel it will only seize again fairly soon. Have to do a motorway run next week, so it will be interesting to see how the mpg has altered.

If you have standard fan wiring (ie, nobody's butchered it), the best way to stop it seizing is to remove viscous fan.

[Shackeng]

Thanks a lot guys, my hand is now serviceable, and sure enough, the i/c fan was not turning. Blocked with leaves and fairly stiff. I have now got it turning freely, and runs fine with 12v input. However, it still feels a little tight. I shall put back as I need it mobile, but I have ordered a new fan to go on as I feel it will only seize again fairly soon. Have to do a motorway run next week, so it will be interesting to see how the mpg has altered.

If you have standard fan wiring (ie, nobody's butchered it), the best way to stop it seizing is to remove viscous fan.

I have taken off this morning for the winter, but having had an overheat in the summer this year, I shall put back on for warm weather next year.

[TheBoy]

Thanks a lot guys, my hand is now serviceable, and sure enough, the i/c fan was not turning. Blocked with leaves and fairly stiff. I have now got it turning freely, and runs fine with 12v input. However, it still feels a little tight. I shall put back as I need it mobile, but I have ordered a new fan to go on as I feel it will only seize again fairly soon. Have to do a motorway run next week, so it will be interesting to see how the mpg has altered.

If you have standard fan wiring (ie, nobody's butchered it), the best way to stop it seizing is to remove viscous fan.

I have taken off this morning for the winter, but having had an overheat in the summer this year, I shall put back on for warm weather next year.

oooooohh, that warrants further investigation

Was you either towing or booting it at the time?

[Shackeng]

Thanks a lot guys, my hand is now serviceable, and sure enough, the i/c fan was not turning. Blocked with leaves and fairly stiff. I have now got it turning freely, and runs fine with 12v input. However, it still feels a little tight. I shall put back as I need it mobile, but I have ordered a new fan to go on as I feel it will only seize again fairly soon. Have to do a motorway run next week, so it will be interesting to see how the mpg has altered.

If you have standard fan wiring (ie, nobody's butchered it), the best way to stop it seizing is to remove viscous fan.

I have taken off this morning for the winter, but having had an overheat in the summer this year, I shall put back on for warm weather next year.

oooooohh, that warrants further investigation

Was you either towing or booting it at the time?

Not really, going up a farly long steep hill in the very hot weather. The light came on and straight off again when I eased off, and I put the VF back on until this morning. Temp, at normal cruise is now where it should be, midway.

[Shackeng]

Presumably the i/c fan is linked to the turbo operation? Also I am puzzled as to why the fuse was not blown with a seized fan.

[TheBoy]

Presumably the i/c fan is linked to the turbo operation?

No, linked to electric cooling fans

Also I am puzzled as to why the fuse was not blown with a seized fan.

Big fuse, small motor (actually, sometimes it does blow the fuse, but often not)

[Shackeng]

Presumably the i/c fan is linked to the turbo operation?

No, linked to electric cooling fans

Also I am puzzled as to why the fuse was not blown with a seized fan.

Big fuse, small motor (actually, sometimes it does blow the fuse, but often not)

So I need to get the cooling fans on to check it. I guess there should be enough 'suck' through the small grill to tell if its on or not.

[maracus]

you'll hear it and feel it. Does the intercooler fan not only come on over a set intake temp?

I had mine on a switch

Also, without the viscous, mine would get too hot in traffic in hot weather. But my front auxiliary fans were non workers...

[Shackeng]

Well I've never checked if the main fans work, I guess I should.

[Vamps]

My auto tractor returns about 25-27 around town, and 35-37 on a run, and has done since in the 4 years I've owned it. These figures seem about right according to the owners handbook, and considering mines covered 183K!!

That is no better than a 2.2 petrol.....

[TheBoy]

Presumably the i/c fan is linked to the turbo operation?

No, linked to electric cooling fans

Also I am puzzled as to why the fuse was not blown with a seized fan.

Big fuse, small motor (actually, sometimes it does blow the fuse, but often not)

So I need to get the cooling fans on to check it. I guess there should be enough 'suck' through the small grill to tell if its on or not.

You'll hear it if you stick your ear near the corner its in.

[TheBoy]

you'll hear it and feel it. Does the intercooler fan not only come on over a set intake temp?

I had mine on a switch

Also, without the viscous, mine would get too hot in traffic in hot weather. But my front auxiliary fans were non workers...

It comes on when coolant reaches a temp hot enough to bring on main electric fans.

With the viscous fan attached, it seems to overcool the rad (most TDs with viscous fans I've seen have had knackered viscous couplings), thus in traffic, the electric fans never come on, and the intercooler fan starts to seize due to lack of use, and its low intake position.


If you are not towing, if your TD overheats without a viscous, you have another problem. The common ones are:

1) Radiator sludges up on these engines at about 120k (whether fitted to Omega, Rangie or beemer)
2) The awful waterpumps occasionally shed parts of an impellor, usually just before shedding the whole lot!
3) Poor oil servicing earlier in life (remember, these had 4.5k service intervals that nobody ever obeyed) causes a black sludge, which blocks the cooling jets.


The black sludge thing, in my experience, doesn't improve with subsequent quick oil changes (although mine was a fairly extreme case).  I had to resort to the work of Satan, and pop a chemical flush in mine.

There is one cooling jet per cylinder, so even if just one is blocked, that will have an effect


Once I'd sorted my tractor, the viscous was removed, and it never went above 96C on the prefacelift gauage (so 92C on facelift gauge), be it on high speed runs up the motorways, up inclines, or around Lake District mountain passes with the back end trying to beat the front .  It was ragged everywhere.

[Shackeng]

Thanks for all that Jaime.

I suspect my i/c fan has not needed to work as you suggest. The cooling system has been flushed and 'should' be OK.
A new metal impellered pump was fitted last year.
The temp has been sitting at 95 or thereabouts with the viscous fitted, which is now removed for winter.
The cooling jets, hmmmm...., it was serviced by VX for the first 40,000 or so, and more frequent oil changes since, so I may have a blocked jet problem, which may have caused my one off overheat on a very hot summer day this year.
What chemical cleaner did you use, and do you recommend it?
Also, I have removed the viscous cowl, which I assume should not be a problem.

[TheBoy]

I suspect my i/c fan has not needed to work as you suggest. The cooling system has been flushed and 'should' be OK.

Rad possibly still sludged up, probably needs to come off, and harsch solvents used...

A new metal impellered pump was fitted last year.

The temp has been sitting at 95 or thereabouts with the viscous fitted, which is now removed for winter.
The cooling jets, hmmmm...., it was serviced by VX for the first 40,000 or so, and more frequent oil changes since, so I may have a blocked jet problem, which may have caused my one off overheat on a very hot summer day this year.
What chemical cleaner did you use, and do you recommend it?

I used one can of http://www.gasolutions.co.uk/engine-treatmetns.html - top right one

Also, I have removed the viscous cowl, which I assume should not be a problem.