viscus fan testing

Submitted: Tuesday, Sep 23, 2003 at 14:09

ThreadID: 7376 Views:1809 Replies:5 FollowUps:1

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simon

Hi All

What is the best way to test a viscus fan to ensure it is working properly

Thanks

Reply By: David N. - Tuesday, Sep 23, 2003 at 14:33

Tuesday, Sep 23, 2003 at 14:33

Been down that track.... very simple really.
If it's hot, and if your donk is hot, then when you rev the engine the fan should "roar".
If it's not "roaring" then it's probably not working.
(you probably hear it "roar" when you first start from cold in the morning for a short time.- it should make that same noise when it cuts in when HOT.)
Cheers

AnswerID: 31766

Follow Up By: Member - Oskar(Bris) - Tuesday, Sep 23, 2003 at 20:44

Tuesday, Sep 23, 2003 at 20:44

Been down that track myself.
You are right.
You cannot tell by turning the fan by hand cold or hot.
At cold start-up it should "roar" for a few seconds and then settle down.
Then as David says it should start to "roar" again when it gets hot.
But I like the idea of filling with new sil. oil.
Cheers
OskarMrs Oskar on Big Red

FollowupID: 22692

Reply By: Hughesy - Tuesday, Sep 23, 2003 at 17:38

Tuesday, Sep 23, 2003 at 17:38

Simon, should be a slight/mild amount of resistance when turning it by hand (with engine off). If there is no resistance or a heap of resistance than it probably needs looking at. Look for signs of fliud leak around the hub too, good indication that it might be stuffed.
Cheers,
Hughesy

AnswerID: 31778

Reply By: howesy - Tuesday, Sep 23, 2003 at 18:31

Tuesday, Sep 23, 2003 at 18:31

In the end there is no real way of knowing. My hilux was getting hot under extreme load at slow speed and Several mechanics said the hub seemed fine. I stripped the hub and cleaned it and toyota sold me the correct silicone oil for $10 a vial. I put three vials in it from completely dry and for two years now the temp dont budge.

Things are not always as they seem

Discount all the other possibilities and if you are still drawing blanks do the reco.

AnswerID: 31783

Reply By: Steve - Tuesday, Sep 23, 2003 at 21:27

Tuesday, Sep 23, 2003 at 21:27

And don't take it to your local Toyo dealer either ... they have no way of knowing.. I can tell you having been ripped off by the dealer on south coast of Victoria..

AnswerID: 31815