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[Pitchfork]

Mine's permanently locked up
I have taken it off to see what happens (it's a lot quieter now)
Now a feint recollection of someone on the forum having rescued a coupling by heating it, in case I have overheating problems as a result of its' removal
Can anyone remember how it was done because the chances of buying a new one that has been correctly stored (vertically) is extremely remote?

[Seth]

Funny you mention the viscous ........
I had mine off yesterday, and used my new Bernzomatic blow lamp to gently apply heat radially to the metal centre hub.
Even at 100 on the gauge mine's yet to 'lock-up'.
Off to Newent with the caravan in tow tomorrow, and there's one very testing climb en-route, a great chance to test this theory.
Will report back ...... !


PS: The Bernzomatic is well worth the money - using MAPP gas, it'll easily warm 1/2" steel rods for bending.
Purchased on Marks DTM's recommendation! 

[Pitchfork]

Funny you mention the viscous ........
I had mine off yesterday, and used my new Bernzomatic blow lamp to gently apply heat radially to the metal centre hub.
Even at 100 on the gauge mine's yet to 'lock-up'.
Off to Newent with the caravan in tow tomorrow, and there's one very testing climb en-route, a great chance to test this theory.
Will report back ...... !


PS: The Bernzomatic is well worth the money - using MAPP gas, it'll easily warm 1/2" steel rods for bending.
Purchased on Marks DTM's recommendation! 

Then you have the opposite problem from me
I was going to use a Hot-Air gun if there is a way of resurrecting them

[Kevin Wood]

IIRC TheBoy ran his tractor without the entire viscous fan assembly with no problems and declared it superfluous (in our climate, at least).

Might as well bin it and do without the noise IMHO. If you do need more cooling add another electric fan.

Kevin

[Seth]

IIRC TheBoy ran his tractor without the entire viscous fan assembly with no problems and declared it superfluous (in our climate, at least).

Might as well bin it and do without the noise IMHO. If you do need more cooling add another electric fan.

Kevin

A valid point Kev, but, there is simply not the room to fit a further fan.

[Turk]

IIRC TheBoy ran his tractor without the entire viscous fan assembly with no problems and declared it superfluous (in our climate, at least).

Might as well bin it and do without the noise IMHO. If you do need more cooling add another electric fan.

Kevin

My viscous fan is tucked in with my spare wheel, and has been for the last 2 months. Tubby Denzils need to be above a certain temp for optimum operation. Most viscous fans, even spinning away un-locked, simply slow down the speed at which that temperature is reached.
I did kinda like the "Whoosh" sound it made though.

[TheBoy]

IIRC TheBoy ran his tractor without the entire viscous fan assembly with no problems and declared it superfluous (in our climate, at least).

Might as well bin it and do without the noise IMHO. If you do need more cooling add another electric fan.

Kevin

A valid point Kev, but, there is simply not the room to fit a further fan.

If room for viscous, there is room for leccy

[Pitchfork]

With the Viscous the 'normal' temp was 92.5, without it so far it's been 95
I need to see what temperature is reached when it's under strain, pulling a heavy weight up a long gradient before I make a commitment to 'bin' it
I think TBs Traktor may have been the exception to the rule, mine's done 150K now & the cooling system has never been scoured out
There are already 2 electric fans so no room for a 3rd as Sethsmate says
If TBs was not an exception then he must have sold his soul one night at the nearest crossroads
Is there anyone out there who knows how to rejuvinate a Viscous Coupling??

[TheBoy]

With the Viscous the 'normal' temp was 92.5, without it so far it's been 95
I need to see what temperature is reached when it's under strain, pulling a heavy weight up a long gradient before I make a commitment to 'bin' it
I think TBs Traktor may have been the exception to the rule, mine's done 150K now & the cooling system has never been scoured out
There are already 2 electric fans so no room for a 3rd as Sethsmate says
If TBs was not an exception then he must have sold his soul one night at the nearest crossroads
Is there anyone out there who knows how to rejuvinate a Viscous Coupling??

95C is a better running temp for tractor, stat is pretty much fully open, and the front fans (and more importantly, the intercooler fan) are on at 96C

[Seth]

Normal running on mine is around 92 on the gauge. Show it a good climb, and it'll rise to the 100 mark, but once over the top, then it'll quickly return to 92.

Last year: New rad, 'stat, and water pump made little difference, even with both electric fans running.

This week: Oil flush with Forte (as per instructions), then engine oil/filter, plus air and fuel filters changed. Cooling system totally drained and flushed with Forte (as per instructions). Gave it an 'Italian Tune-up' before draining again. 'Stat and water pump removed, and engine 'back-flushed' with hose - no debris (bits of old impellers etc) apparent. Added Forte cooling system conditioner, plus 5 litres of Vx pink antifreeze. Whilst the viscous was off, I gently warmed the hub radially, to see if it'll now 'kick in' as the temp rises.

Off to Newent in morning, so we'll see what happens temp-wise on the climb up from Monmouth towards Symonds Yat with the caravan in tow.

I'll duly report back on our return ...... !

[TheBoy]

as said, i reckon viscous overcools when engine doesn't need cooling, and does sod all when it does

[magspec]

I got a new viscous fan hub from German and Swedish for about £30quid. Same as BMW 325 TDS

[Pitchfork]

I got a new viscous fan hub from German and Swedish for about £30quid. Same as BMW 325 TDS

Did it function?
Apparently they have to be stored vertically - what parts dept or Carrier does this?
Laying it flat causes it to go wrong

[platty]

Whilst the viscous was off, I gently warmed the hub radially, to see if it'll now 'kick in' as the temp rises.

I still don't fully understand what you mean by kicking in? The fan is always spinning in my experience - I don't see how its behaviour is altered by engine temperature? (I might well have got this around my neck  :-/)

[Sey Cren]

cohesive over cools if engine doesn't charge cooling, and does sod all if it does


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