Noise from fan area

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Dec 29, 2007 | 03:48 PM

jtg700

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Joined: Apr 2007

Posts: 55

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From: Rochester New York

Noise from fan area

Hello. When I rev my L-82 up to 3000 rpm, or under load, I hear a rapid banging noise coming from the fan area (sounds like a machine gun!). It almost sounds as if the fan is hitting something, but it isn't. New water pump, radiator, hoses, etc. Could it be the fan clutch? Would it make a sound like this if it were going bad? Thanks!

Dec 29, 2007 | 04:07 PM

Durango_Boy

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Joined: Aug 2006

Posts: 24,125

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From: Columbia Missouri

Check for nicks all around on the inside of the shroud. When the fan hits a high RPM it may be flexing just enough to hit the shroud or pulling the shroud into it.

Dec 29, 2007 | 04:09 PM

Binnie77

Drifting

Joined: Jan 2001

Posts: 1,841

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From: Halifax, NS, Canada

You might want to check the harmonic balancer for separation. When those things start to let go they can make some funny noises. Also if the timing chain gets real loose, it will hit the side of the cover.

Last edited by Binnie77; Dec 29, 2007 at 04:12 PM.

Dec 29, 2007 | 04:33 PM

rihwoods

Race Director

Joined: Feb 2005

Posts: 16,100

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To check clutch fan:

Engine off...rotate fan and check for "wobble" or play...should not have play more than 1/8".

Engine running..at idle....watch fan while turning engine off...it should stop within two turns...

Rich

Dec 29, 2007 | 04:42 PM

7t2vette

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From: Toronto Ontario

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Quote:

Originally Posted by Durango_boy

Check for nicks all around on the inside of the shroud. When the fan hits a high RPM it may be flexing just enough to hit the shroud or pulling the shroud into it.

This was my first thought........check the shroud for damage.

Dec 29, 2007 | 04:49 PM

L82shark

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Joined: Oct 2007

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From: Collinsville MS

St. Jude Donor '08

Quote:

Originally Posted by 7t2vette

This was my first thought........check the shroud for damage.

when you reinstalled the shroud, you may not have gotten it centered. Look for that if there arent any broken areas. Get a spotlight and hit the gas with your hand and see if you can locate any new rubbed areas.

Dec 29, 2007 | 04:55 PM

speedreed8

Melting Slicks

Joined: Oct 2006

Posts: 2,417

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From: Texas

thats what happened to my L82, the fan clutch was old and wobbly. when it reved up the fan was hitting the top of the shroud. new clutch and all is quiet.