The case of the immovable viscous fan!

[eltax91]

Hi all

I have a 200tdi 90 and I'm in the middle of a cam belt change. Fluids and pipes out, fan cowling off, then I'm stuck.

For some reason, the fan will not move. I've doused it several times in plus gas, have a high tensile bolt wedged in water pump hole, up against a breaker bar secured between engine and front, then levered my 32mm viscous fan spanner with my jack handle it it still won't budge!

Am I correct that the 200tdi is a left hand thread? I have tried both way but not a bean.

Any tips, or do I hack the fking thing off and replace the pump and fan?

I don't remember it being this difficult on my old 200tdi disco!

[eltax91]

300bhp/ton said:

IIRC they are reverse threaded and can be tight. Make sure you are on the nut correctly too. Good luck!

Thanks! I think I'm getting a decent grip on the nut, although the spanner has a swan neck on it, it does slip eventually. Anyone know if the nut is 32mm? I have a fan spanner I bought, with a 32 and 36mm end, as I bought it for my old disco 200Tdi, I assumed it would be the same on the Defender. Access is tight, but it certainly feels the right size.

[eltax91]

Norse_mann said:

I've a 300tdi but I think the fan is the same.

It is a reverse thread and can be tight, It can be a bugger as the engine turns as you are trying to undo it - I tend to pop it into difflocked 1st gear and that should stop the engine moving too making it easier to undo the bolt.

Putting it back on is even more fun!

I tried that, but it still wouldn't move, so I've not got a breaker bar running from engine block to rad inlet. Then a very strong high tensile bolt through water pump hole, wedged against the bar.

Still nothing, if i lever it with the jack handle it just slips eventually.

Wondering if i have the right spanner

[eltax91]

This is the fan spanner I'm using:- http://compare.ebay.co.uk/like/230729326545?var=lv...

Anyone care to comment on its usefulness? I'm wondering if it has too much "flex" in the end, since it's quite mild steel, and thus why it's slipping off the nut

[eltax91]

kooky guy said:

Ratherthan applying strain, have you tried a sharp rap to the end of the spanner with a hammer?

That's all I needed to do on my Rangey to release the viscous.

Yep. With huge fk off lump hammer! Felt like the spanner was flexing and taking up the shock!

Is it possible to remove pump and fan as a complete unit?

[eltax91]

HarryW said:

eltax91 said:

kooky guy said:

Ratherthan applying strain, have you tried a sharp rap to the end of the spanner with a hammer?

That's all I needed to do on my Rangey to release the viscous.

Yep. With huge fk off lump hammer! Felt like the spanner was flexing and taking up the shock!

Is it possible to remove pump and fan as a complete unit?

A heavy shock/tap has worked for me in the past on other lumps when all else has failed. Struggling to see where you go. Are you 100% going the right way. Another trick on seized bolt/turny things is to shock it both ways, seems counter intuitive but tightening up can help release too....

As you look at the engine from the front, I'm going right (clockwise). The bloody thing wont shift!! I'm starting to wonder if a previous owner damaged the head, it looks ok, but as you know, access it limited to see.

Something I have not tried is to wedge a chisel into the fins on the metal bit that attaches the fan to the pump. Are these fixed, or will they just rotate with the fan?

I might have a go at removing the pump and fan all in one.

[eltax91]

Well, I've tried going both ways and still failed miserably! Even with a spare pair of hands holding the spanner it won't budge. The spanner just slips on the nut in the end.

So, any quick and dirty ways around this problem?

[eltax91]

JimexPL said:

If you take the rad out can't you get a socket on the bolt and a decent breaker bar?

No, the nut for the fan is between the fan itself and the water pump. So, you have around 10mm to work with to get the spanner in.

If you are back up in Leicestershire anytime soon (it was you with the red v8 on our laneing trip wasn't it?), then feel free to pop in for a cuppa, even if just to point and laugh!