79 front knocking sound

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Nov 28, 2015 | 03:43 PM

Srusl31

Thread Starter

6th Gear

Joined: Nov 2015

Posts: 6

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79 front knocking sound

Hey guys I have a knocking sound coming from the fan area I'm not sure if its the water pump or fan hitting the shroud or just something loose. As of now i haven't felt or seen anything loose. Any feedback is appreciated. Thanks

Nov 28, 2015 | 04:04 PM

Oldguard 7

Melting Slicks

Joined: Apr 2002

Posts: 2,337

Likes: 14

From: Norfolk VA

Quote:

Originally Posted by Srusl31

I clicked on the link and it says video is private. My fan blade was hitting the shroud last week. It noise was metallic and intermittent. In my case one of the bolts holding the shroud to the rad support was missing. May want to make the vid "public" so members can see it.

Nov 28, 2015 | 04:07 PM

Srusl31

Thread Starter

6th Gear

Joined: Nov 2015

Posts: 6

Likes: 0

Quote:

Originally Posted by Oldguard 7

Thanks for response man! sorry video should be public now.

Last edited by Srusl31; Nov 28, 2015 at 04:08 PM.

Nov 28, 2015 | 04:13 PM

toobroketoretire

Melting Slicks

Joined: Apr 2009

Posts: 2,632

Likes: 112

From: Great Plains Iowa

It sounds like the tip of one blade is hitting the underside of the shroud. When they hit they usually hit in the 1 to 2 o'clock position so take a good look at how close the blades are to the shroud in that 1 to 2 o'clock area. And its usually the front of the blade tip that is touching because of the shroud's radius. If you find it is touching you can easily trim the foreword tip of each blade an equal amount. I used an ordinary washer to scribe around to mark a nice radius on my fan blades and took care of my fan-hitting-shroud problem.

Nov 28, 2015 | 06:30 PM

Srusl31

Thread Starter

6th Gear

Joined: Nov 2015

Posts: 6

Likes: 0

Quote:

Originally Posted by toobroketoretire

Thanks toobroketoretire I actually trimmed the blades and no luck.. still makes the noise.

Nov 28, 2015 | 07:01 PM

tonak

Safety Car

Joined: Nov 2008

Posts: 4,368

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From: Colorado

Stethoscope or a looong screwdriver to the ear would probably make it pretty clear where the noise is coming from.

Last edited by tonak; Nov 28, 2015 at 07:01 PM.

Nov 28, 2015 | 07:25 PM

toobroketoretire

Melting Slicks

Joined: Apr 2009

Posts: 2,632

Likes: 112

From: Great Plains Iowa

Quote:

Originally Posted by tonak

Stethoscope or a looong screwdriver to the ear would probably make it pretty clear where the noise is coming from.

A 4 foot length of 5/8" garden hose works about 100 times better as the hose blocks out all other noises.

Nov 28, 2015 | 08:25 PM

vette_jim

Instructor

Joined: Nov 2014

Posts: 161

Likes: 17

From: Georgia

Water pump bearing possibly, mine sounded like rocks in there instead of a bearing . The shaft was still tight, no wobble.

Last edited by vette_jim; Nov 28, 2015 at 08:29 PM.

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Nov 28, 2015 | 10:02 PM

'75

Le Mans Master

Joined: Dec 2007

Posts: 6,422

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From: McHenry Illinois

Take the belts off then try it, while they're off you might want to get rid of that flex fan, lots of horror stories about them flinging blades through the hood!