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  #1  
Old February 20th, 2013, 07:28 PM
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Sound from Fan

So when i got home from ROMPi noticed the engine had a bit of a louder sound than i was used to, it didn't really change with revs, but also once i revved it it go drowned out.

Popped the hood at idle and i noticed it seemed to be coming from the front of the engine by the fan, inside the truck it sounds like a bit of a rumble, but with the hood open it sounds like the fan is really loud.

Put my ear in front of the radiatior, and it sounds like its sucking in alot of air, which may or may not be the way its always sounded, i never really stuck my ear next to the radiator before.

I read a bunch of post about how to check if the fan clutch is shot, but still am not sure if mine is. No i didn't try and stop it with a newspaper... i dont want to risk breaking a plastic blade thats probably brittle in this cold weather

w/ a cold engine off, if i try to spin the blades wheel of fortune style they spin maybe 1/4 turn or less and stop. its not siezed up, and has some resistance. Does this sound like its working properly?

I guess the next thing to do would be remove the belt, and see if the sound goes away. If so I know its either the fan or maybe the water pump (but the fact it sounds like the fan is loud tells me its not the water pump) It certainly is NOT a high pitch sound or any sort of squealing or squeeking.

I'm thinking about selling the truck (although it didn't sell on ebay), and would like to sort this out before passing it on to the next person.
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  #2  
Old February 21st, 2013, 05:32 PM
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Here's a video of me trying to spin the fan when the engine is cold. I'm giving it my best wheel of fortune spin. http://youtu.be/qsR5KjGErss
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Old February 21st, 2013, 05:58 PM
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It is broken. It has siezed locked on. It should spin free when cold.
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Old February 21st, 2013, 06:14 PM
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When you say freely do you mean full rotation? Multiple rotations? Etc
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Old February 21st, 2013, 07:22 PM
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Quote:
Originally Posted by bossman429 View Post
When you say freely do you mean full rotation? Multiple rotations? Etc
Yes. It should have minimal resistance cold.
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Old February 21st, 2013, 09:19 PM
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It will not spin freely like a bicycle wheel but will rotate with a little pressure applied.
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Old February 21st, 2013, 09:29 PM
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Quote:
Originally Posted by MC22958 View Post
It will not spin freely like a bicycle wheel but will rotate with a little pressure applied.
Well mine does this....
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Old March 10th, 2013, 06:33 PM
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So I took off the fan and clutch, and the sound was still there, albeit much more subdued. I swapped the fan onto a brand new Oem viscous clutch and put it back on, fired it up and the sound was there and back to the original sound level. Here's a vid I took. It's hard to hear but you hear a kind of rumble sound, on and off a little. I'm thinking maybe a bad water pump? It's almost grinding like. You can't hear it as well when the engine is revved, but you do notice it on idle.


http://youtu.be/gXu9lUB1YUY
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Old March 10th, 2013, 06:48 PM
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Quote:
Originally Posted by bossman429 View Post
So I took off the fan and clutch, and the sound was still there, albeit much more subdued. I swapped the fan onto a brand new Oem viscous clutch and put it back on, fired it up and the sound was there and back to the original sound level. Here's a vid I took. It's hard to hear but you hear a kind of rumble sound, on and off a little. I'm thinking maybe a bad water pump? It's almost grinding like. You can't hear it as well when the engine is revved, but you do notice it on idle.


http://youtu.be/gXu9lUB1YUY
Get yourself a Mechanic's Stethoscope and see if you can pinpoint the source. Tough to tell from the video where the sound is coming from.
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Old March 10th, 2013, 06:52 PM
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You get what sound I'm talking about though right?


Not sure if its audible to others in the video. I hear it but it may be because I know what I'm listening for
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Old March 11th, 2013, 12:51 PM
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could be the tensioner bearings going...
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Old March 11th, 2013, 03:06 PM
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Checked the water pump pulley. It has play in it. Gonna assume that's it

New one on order for 85 bones

There is no tensioner on these belts
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Old March 11th, 2013, 04:24 PM
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When my water pump was going, it gave off few noises until the end. What I got was screeching an general unhappiness from under the hood. When it sieze nothing would work.
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Old March 13th, 2013, 12:59 PM
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So i took the water pump out (new one should be here Friday), and this is the sound it was making, sounds very much like the sound i was hearing, and the pulley and fan only amplified it more. very confident this will fix it.

http://www.youtube.com/embed/DFXlyr1...xOOlM3dufklQFA"

Next question - do you guys use the paper gasket that comes with the WP or do you prefer silicone? I've had great success with silicone for applications like this (T-Stat, drive flanges etc), and only seen paper gaskets leak. The WP had some silicone on it and no gasket. It did not leak a drop.
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Old March 13th, 2013, 01:31 PM
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I used silicone gasket maker smeared on the paper gasket - no leaks.
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Old March 13th, 2013, 01:35 PM
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Quote:
Originally Posted by sonoronos View Post
I used silicone gasket maker smeared on the paper gasket - no leaks.
Same here...
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Old March 14th, 2013, 08:39 PM
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New water pump in. All better.

Here a bench comparison
http://youtu.be/8Sh4_uY-FRo

I just used silicone gasket maker and not the paper gasket. I figure id stick with what has worked for me in the past.

I did have one bolt strip out though. Was able to drill and re tap it with a m10. I don't know why they aren't all studs instead of bolts.
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