Opinion needed on fan interference - Defender Source
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  #1  
Old November 12th, 2009, 08:35 PM
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Charles Galpin
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Opinion needed on fan interference

I finally got around to replacing my viscous fan clutch since my truck still easily runs warm.

I have a non-stock steup. I bought a cross reference fan clutch a while back so I forget what model # - seems to be a perfect match other than I had to slightly enlarge the mounting holes in the fan to accommodate larger 10mm mounting bolts. I also have a disco serpentine engine and shroud, not a stock '94 setup.

Anyhow. Either there is a slight difference in the depth of the fan clutch, or the fan is slightly off center now since I had to enlarge the mounting holes, but I have a slight bit of interference between the fan and the shroud now at one point.

So my question is should I just let the two rub and self clear, or should I try trim the blades or shroud?

My gut says let it self clearance as it would be the least invasive, but don't want to make a mistake as I'm headed out of town tomorrow.

Thanks in advance for your thoughts.

charles
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  #2  
Old November 12th, 2009, 08:57 PM
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Shim the radiator.
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  #3  
Old November 12th, 2009, 09:07 PM
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If is not too bad, let it self correct...
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  #4  
Old November 12th, 2009, 09:13 PM
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Charles Galpin
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You mean shim the shroud? I tried to find where it's hitting but I can't. I should have mentioned 2 other things.

1. This fan clutch has an exposed spring on the front, I assume to engage/disengage based on the temperature. The stock one may be internal, but this is exposed.
2. This clutch fan has been in a troy box for a few months and got wet at some point and the main nut shows some rust, so not sure if there could be any internal rust.

I just took a test drive and it never seemed to disengage. I am wondering if it's seized and that noise I hear is from the clutch itself.
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  #5  
Old November 12th, 2009, 09:15 PM
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Does it sound like a jet engine? I have seen numerous aftermarket fan clutches lock up either right on installation or shortly thereafter.

I mean shim the radiator. you can move it up on down on either side with little pieces of rubber under the studs.
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  #6  
Old November 12th, 2009, 09:20 PM
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Charles Galpin
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Quote:
Originally Posted by evilfij
Does it sound like a jet engine?
I wouldn't put it under the "sounds like it's going to take off" category, just loud. Maybe it's ok. Once it cools I'll start it and I expect to hear the jet engine take off sound initially and then have it settle back down. If it doesn't I'll be suspicious.
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  #7  
Old November 12th, 2009, 09:34 PM
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Same thing happened with my 90 when I switched to the imperial clutch and metal fan -- turned out it was the blades being slightly bigger than stock and the plastic of the shroud not being a perfect semicircle. It self corrected in a few miles.
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  #8  
Old November 13th, 2009, 07:46 AM
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Thanks guys. I'll just see how it goes then.
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  #9  
Old November 13th, 2009, 08:31 AM
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I would take it off and trim it a bit, probably can be done fairly quickly with a cut off wheel. The way engines can move around you could end up with a mess on your hands if the fan catches and breaks. I've seen the results of a fan shattering and it wasn't pretty. Mind you that was one of the notorious white plastic range rover fans that had gone yellow and just degraded to the point where it split and flew off the hub in two or three pieces.

If you take 1/8 - 1/4" off the fan that probably won't affect your cooling very much. Or do like Ron said and move the shroud a bit if that works.

I know...Doom and Gloom...


Quote:
Originally Posted by cgalpin
Thanks guys. I'll just see how it goes then.
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  #10  
Old November 13th, 2009, 08:34 AM
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The thing is I can't even identify where it's rubbing. The fan looks perfectly centered on the clutch too.

I need to take a short drive to fetch my trailer today, so I'll see if it quiets down during that.
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  #11  
Old November 13th, 2009, 09:57 AM
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Broken motor mount?
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  #12  
Old November 13th, 2009, 09:59 AM
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Charles Galpin
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Quote:
Originally Posted by pendy
Broken motor mount?
I'll check, but I didn't have any problems before pulling the fan, and it didn't require any force or anything.

thanks,
charles
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  #13  
Old November 13th, 2009, 02:11 PM
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Motor mounts are fine. Seems locked. I guess two different issues. The noise doesn't sound harmful to me so I'm going to wing it. Wish me luck
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  #14  
Old November 13th, 2009, 06:54 PM
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Quote:
Originally Posted by cgalpin
Motor mounts are fine. Seems locked. I guess two different issues. The noise doesn't sound harmful to me so I'm going to wing it. Wish me luck
Do you wheel? I assume you do based on your avatar. If you have very minor intereferance on road, when you take it off and the motor moves or the frame moves, or both, the minor interferance can turn major. I had over a .25in of clearance and one time I jammed on it and broke my fan in about 30 pieces and managed to somehow brake the clutch too. I think that it happened at the same time. I would take the time to fix it now if I were you.
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  #15  
Old November 14th, 2009, 04:03 PM
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Problem solved. Some idiot put the fan on backwards! I'm not happy about this so asked to speak to management, but they tell me he's off wheeling.
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  #16  
Old November 14th, 2009, 05:26 PM
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You should track the guy down and beat him... oh wait...
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  #17  
Old November 15th, 2009, 08:19 AM
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Quote:
Originally Posted by bharris
You should track the guy down and beat him... oh wait...
100% agree. Let's plan to send a small group of us to take care of the guy and make sure he does not do this again. I get the feeling that the Rover community needs to step up to make an example!
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  #18  
Old November 15th, 2009, 09:07 PM
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Quote:
Originally Posted by MonLand
100% agree. Let's plan to send a small group of us to take care of the guy and make sure he does not do this again. I get the feeling that the Rover community needs to step up to make an example!
Not the direction I was hoping this would go

Management says they will give a full refund for all labor charges and do the next one free!

Ok, so the good news is no damage occurred and the interference is gone, but the bad news is the clutch is definitely locked "on". I'll have to see if I can get a replacement under warranty for another try otherwise I'll go genuine.
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  #19  
Old November 15th, 2009, 11:08 PM
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Do the middle east overheating saga mod. And just get your money back for the fanclutch.
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  #20  
Old November 16th, 2009, 08:43 AM
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Charles Galpin
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Quote:
Originally Posted by pendy
Do the middle east overheating saga mod. And just get your money back for the fanclutch.
I'll look into that thanks. The funny thing is it runs cool right now, but I guess I am losing horsepower and may run too cool in the winter.
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