Fan wobble
Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
Just wanted to thank everyone on here for recent and not so recent posts about how to change the water pump. She is all fixed. No leaks. No more fan wobble.
Kinda of amazing that the parts stores have so many parts still in stock. $41 for a new water pump.
This job was the biggest job I have done on an engine. I thought it was wild that I could take the whole front of the motor/pulleys apart with three wrenches.
Thanks all.
Kinda of amazing that the parts stores have so many parts still in stock. $41 for a new water pump.
This job was the biggest job I have done on an engine. I thought it was wild that I could take the whole front of the motor/pulleys apart with three wrenches.
Thanks all.
Thanks for adding closure to your page posting.
Orich
Cross-Country
Joined: May 2025
Posts: 57
Likes: 1
Worn water pump bearing can cause the fan to wobble. With engine OFF, place your mitts on both sides of the fan, try wiggling it back and forth. If it does, time for a new water pump.
It's rare to have a fan with bent blades. The only time this could occur is if the fan contacts the radiator.
On a truck this old, the fan can develop minute cracks radiating outwards from the 4 mounting holes. If the fan is cracked, replace it.
It's rare to have a fan with bent blades. The only time this could occur is if the fan contacts the radiator.
On a truck this old, the fan can develop minute cracks radiating outwards from the 4 mounting holes. If the fan is cracked, replace it.
replaced top idler, swapped ac compressor clutch , alternator , tensioner assembly, belt and power steering
Cross-Country
Joined: May 2025
Posts: 57
Likes: 1
mine doesn’t appear to move on the water pump side only on fan and fan clutch side
https://youtube.com/shorts/zoXn6hY9X...24B6ajy6G0j7u5
https://youtube.com/shorts/DaVGAHHJr...Zo3wreBGYbvlB8
^ The play in my fan
replaced top idler, swapped ac compressor clutch , alternator , tensioner assembly, belt and power steering
https://youtube.com/shorts/zoXn6hY9X...24B6ajy6G0j7u5
https://youtube.com/shorts/DaVGAHHJr...Zo3wreBGYbvlB8
^ The play in my fan
replaced top idler, swapped ac compressor clutch , alternator , tensioner assembly, belt and power steering
Lead Driver
Joined: Jul 2017
Posts: 9,591
Likes: 1,171
From: San Jose, CA
Regarding earlier comments about bent blades, don’t some fans have at least one blade out of skew with the rest? Pretty sure it’s a noise reducing aspect of fan design.
I could be wrong, but that’s what I thought I’d seen before.
I could be wrong, but that’s what I thought I’d seen before.
Cross-Country
Joined: May 2025
Posts: 57
Likes: 1
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Joe Kucinski
Lead Driver
Joined: Jul 2017
Posts: 9,591
Likes: 1,171
From: San Jose, CA
The fan has definitely been hitting that shroud to wear a hole like that.
The sound in some of your videos actually does sound like two things hitting each other. Like perhaps just one blade is doing the mischief.
Can you tell if the radiator has been relocated? Or just installed incorrectly, or perhaps an incorrectly fitting radiator was utilized.
Or perhaps there is a body lift on the truck? If body lifts are installed it changes the relationship of the radiator that’s bolted to the body and the fan that remains on the engine.
Some people don’t do anything to compensate for this change because they don’t think it’s hitting.
The sound in some of your videos actually does sound like two things hitting each other. Like perhaps just one blade is doing the mischief.
Can you tell if the radiator has been relocated? Or just installed incorrectly, or perhaps an incorrectly fitting radiator was utilized.
Or perhaps there is a body lift on the truck? If body lifts are installed it changes the relationship of the radiator that’s bolted to the body and the fan that remains on the engine.
Some people don’t do anything to compensate for this change because they don’t think it’s hitting.
Lead Driver
Joined: Jul 2017
Posts: 9,591
Likes: 1,171
From: San Jose, CA
I guess one more test you could try, albeit kind of a pain to accomplish, would be to remove the shroud entirely and run the engine that way. See if the sound remains.
If it goes away, then figure out a way to change the relationship between the fan and the shroud.
If the sound continues, then you know to keep looking, but it also might give you more access to finding the problem without the shroud in the way.
If it goes away, then figure out a way to change the relationship between the fan and the shroud.
If the sound continues, then you know to keep looking, but it also might give you more access to finding the problem without the shroud in the way.
Cross-Country
Joined: May 2025
Posts: 57
Likes: 1
The fan has definitely been hitting that shroud to wear a hole like that.
The sound in some of your videos actually does sound like two things hitting each other. Like perhaps just one blade is doing the mischief.
Can you tell if the radiator has been relocated? Or just installed incorrectly, or perhaps an incorrectly fitting radiator was utilized.
Or perhaps there is a body lift on the truck? If body lifts are installed it changes the relationship of the radiator that’s bolted to the body and the fan that remains on the engine.
Some people don’t do anything to compensate for this change because they don’t think it’s hitting.
The sound in some of your videos actually does sound like two things hitting each other. Like perhaps just one blade is doing the mischief.
Can you tell if the radiator has been relocated? Or just installed incorrectly, or perhaps an incorrectly fitting radiator was utilized.
Or perhaps there is a body lift on the truck? If body lifts are installed it changes the relationship of the radiator that’s bolted to the body and the fan that remains on the engine.
Some people don’t do anything to compensate for this change because they don’t think it’s hitting.
