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TOPIC: cooling fan pulley

coolimg fan pulley 10 months 4 weeks ago #933

  • zvolvo123
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Hello all,

Anyone ever have the cooling fan pulley crack on them?

I've got a 122 with what appears to be a '73 142 b20 engine. The other day i fired it up and it sounded like i threw a rod, but when i checked, the pulley cracked all the way around just behimd the fan. Problem is, i can't find a parts hoise that has one.

Anyone else had this problem? If so, how did you fix it?

Thanks!

Tommy
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coolimg fan pulley 10 months 4 weeks ago #934

  • gdill3
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zvolvo123 wrote:
Hello all,

Anyone ever have the cooling fan pulley crack on them?

I've got a 122 with what appears to be a '73 142 b20 engine. The other day i fired it up and it sounded like i threw a rod, but when i checked, the pulley cracked all the way around just behimd the fan. Problem is, i can't find a parts hoise that has one.

Anyone else had this problem? If so, how did you fix it?

Thanks!

Tommy

Welcome to the Forum, Tommy.

Is the fan bolted directly to the pulley or to a fan clutch?

How many grooves in the CRANK pulley on the car?

Does it appear that the pulley has separated at a bonded joint or is the material actually split?

Post a pic and/or describe the part you need and we should be able to find a good used pulley.

Thanks.


George Dill
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coolimg fan pulley 10 months 4 weeks ago #935

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Hello again George.

It is actually cracked all the way around. Heres a pic and a vid clip. It's pretty hard to see in the pic, but in the clip about half way watch the pulley and the fan blades. When i push on the belt, you'll see them wobble. When running it sounds like a rod slung.

There is one from an early 60's 544 on ebay i'm bidding on, but are there other alternatives like going electric? It doesn't look like much room between the pulley and the radiator.

Thanks for the help!

Tommy

Well, can't ul video. I'll try email.
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coolimg fan pulley 10 months 4 weeks ago #936

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The pic shows an aftermarket flex fan with a spacer to clear the belt. It appears that this spacer is the culprit as the mating surfaces put stresses on the pulley when the bolts are snugged up. Electric pusher fans (two small ones up front) are a popular fix for B18/20 in hot climates. Another option is to go with an OE rigid fan which would have a blade profile not requiring a spacer.

George Dill
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coolimg fan pulley 10 months 3 weeks ago #939

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Thanks George!

I think I'll go electric. Any suggestions as to which make/model and installation tips?

Tommy
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coolimg fan pulley 10 months 3 weeks ago #945

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zvolvo123 wrote:
Thanks George!

I think I'll go electric. Any suggestions as to which make/model and installation tips?

Tommy

Two ways to go...

- two small pusher fans in front of the radiator offset to the side

- a single slim-line fan between the water pump and radiator (no OE fan mounted)

Note that once the car is rolling at about 25mph the airflow through the radiator exceeds fan speed.

The fan(s) should have dedicated wiring/switches/relays/fuse and be controlled by a thermostat with user input.

If your Volvo has a 6-volt battery consider an upgrade to 12v for best fan performance.

George Dill
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