Viscous Fan Thing

Post by **GQAndrew** » Wed Sep 29, 2004 11:58 am

Hi Guys,

Noticed that the Viscous Coupling on the fan of my TD42 has seized, causing it to always spin at full speed I imagine, obviously will need fixing, but mechanic may not have time today, what are the effects of leaving it partially seized for a couple of weeks, can it cause any problems??

Post by **chimpboy** » Wed Sep 29, 2004 12:08 pm

I did this. I am pretty sure it is what killed my water pump, but can't be 100% on that. It took more than a few weeks to do it though.

It's a very easy job to swap a new one in if you have the parts.

I actually have a good viscous coupling here, but there are (at least) two different bolt patterns on the fan side. So what I have is a good coupling + crap fan, and a crap coupling + good fan, and I can't mate the good fan to the good coupling!

Jason

Post by **mkpatrol** » Wed Sep 29, 2004 12:50 pm

Chimp, your water pump failure was coincidental. All the fan will do is be noisy & the engine will use slightly more fuel. In winter the engine wont get to operating temp as quick either. The load is there on the waterpump wether it is spinning or not from the weight of the fan.

Post by **chimpboy** » Wed Sep 29, 2004 1:07 pm

mkpatrol wrote:Chimp, your water pump failure was coincidental. All the fan will do is be noisy & the engine will use slightly more fuel. In winter the engine wont get to operating temp as quick either. The load is there on the waterpump wether it is spinning or not from the weight of the fan.

Mmm, that was what I thought before the water pump died, but if you see the fan spinning at high rpm, you'll notice a lot more vibration than when it's turning slower. The fan's shape actually distorts more, too, which I believe could lead to premature cracking (and contribute to the vibration if it imbalances the fan).

So I'm not saying the seized clutch definitely caused water pump failure, but it's not just load, it's vibration as well. So I believe it's possible.

Jason

Post by **mkpatrol** » Wed Sep 29, 2004 1:12 pm

It was most likely almost worn out & the vibration finished it off.

The fan shouldnt virate, has it been damaged in any way?

Post by **GQAndrew** » Wed Sep 29, 2004 2:11 pm

All is sorted, getting a new one fitted today. Thanks for the replies

Post by **bogged** » Wed Sep 29, 2004 2:55 pm

GQAndrew wrote:All is sorted, getting a new one fitted today. Thanks for the replies

do u have a price and part # for it??

Post by **GQAndrew** » Wed Sep 29, 2004 3:15 pm

bogged wrote:do u have a price and part # for it??

Price is $210 from Coventries, not sure about part #

Post by **chimpboy** » Wed Sep 29, 2004 3:56 pm

mkpatrol wrote:It was most likely almost worn out & the vibration finished it off.

The fan shouldnt virate, has it been damaged in any way?

No, it's in excellent condition, but it is spinning a lot faster than it's designed to do. You can clearly see the blades stretch out and straighten up a little, so if one blade were to stretch more than another then it could easily get out of balance.

Look, I could be wrong, the two problems might be unrelated, all I can say is that after driving around with a seized fan coupling for a few months I found I had to replace both the fan coupling AND the water pump, and I can see a very plausible scenario where one caused the other.

Jason

Post by **mkpatrol** » Thu Sep 30, 2004 8:19 am

Jesus dude relax. Im just trying to help you. Iv had it with this site & arguing with people who dont have a clue. None of you want to listen to sound advice from someone who knows.

Post by **chimpboy** » Thu Sep 30, 2004 9:15 am

mkpatrol wrote:Jesus dude relax. Im just trying to help you. Iv had it with this site & arguing with people who dont have a clue. None of you want to listen to sound advice from someone who knows.

Eh?

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