!HELP! Underdrive pulley install question
Thread Starter
Pro
Joined: Mar 2010
Posts: 701
Likes: 2
From: Lewisville TX
!HELP! Underdrive pulley install question
Okay so i have an 05' that is in right now for the crank pulley bolt issue. Well the harmonic balancer is on "national backorder" per GM. So i went to LG and picked up thier underdrive pulley to replace it.
The Fix that Gm had for the problem with the 05's is to put that washer (diamond etched or something) in there to help hold it in.
Now i called 2 performance shops and they just say that all you need to use is the bolt that has the red material on the underside of the large washer head and torque it to the right specifications.
The Chevy Dealership wanted to warn me that since this underdrive didn't come with a washer like the OEM part now comes with you may have the same problem.
Does anyone know the story here, especially for 05's, if most people reuse the washer that may come with the new bolt on the inside of the balancer/pulley, or if it is even necessary?
Please anyone tell me your thoughts.
The Fix that Gm had for the problem with the 05's is to put that washer (diamond etched or something) in there to help hold it in.
Now i called 2 performance shops and they just say that all you need to use is the bolt that has the red material on the underside of the large washer head and torque it to the right specifications.
The Chevy Dealership wanted to warn me that since this underdrive didn't come with a washer like the OEM part now comes with you may have the same problem.
Does anyone know the story here, especially for 05's, if most people reuse the washer that may come with the new bolt on the inside of the balancer/pulley, or if it is even necessary?
Please anyone tell me your thoughts.
Safety Car
Joined: Jan 2008
Posts: 4,711
Likes: 3
From: Middle of No where AK
The original bolts were supposed to be defective. The replacment bolt with the red stuff underneath it is supposed to be the replacment. I used that same bolt on my car when I did my cam swap two years ago and havent had a problem with it.
Thread Starter
Pro
Joined: Mar 2010
Posts: 701
Likes: 2
From: Lewisville TX
And you did not put a washer (Diamond etched or whatever that 05 service bulitin said) on the inside of the pulley as like an extra.
I am just verifying the pulley and bolt on the outside are all that are needed. I think they are going to put a new seal in but i don't need a washer on the inside of the pulley?
Again all advice is helpful as I will check with LG in the morning, but really would like them to finish with my car tomorrow.
Thanks
I am just verifying the pulley and bolt on the outside are all that are needed. I think they are going to put a new seal in but i don't need a washer on the inside of the pulley?
Again all advice is helpful as I will check with LG in the morning, but really would like them to finish with my car tomorrow.
Thanks
Tech Contributor
Joined: May 2008
Posts: 2,843
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From: Howell Michigan
St. Jude Donor '09-'10-'11
I would not install the harmonic damper without the washer. The wash is very thin. I would guess about .005 inch. Here is what it looks like.
This is it on the balancer,
This is it on the balancer,
Drifting
Joined: Jul 2009
Posts: 1,319
Likes: 64
From: Lakeville, MA
St. Jude Donor '10
That washer didn't fit on my SLP/Powerbond pulley so I didn't use it. No issues thus far. When I asked the question I was told it was there to keep oil from leaking. The pulley is a tight press fit and I couldn't see how any oil could get by.
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Tech Contributor
Joined: May 2008
Posts: 2,843
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From: Howell Michigan
St. Jude Donor '09-'10-'11
You can assemble without it but your risk of damper spin on the nose of the crankshaft goes up big time and in worse case you stand a risk of having to replace the crankshaft if it does spin. I wouldn't put one together without it. JMHO!
Drifting
Joined: Jul 2009
Posts: 1,319
Likes: 64
From: Lakeville, MA
St. Jude Donor '10
The washer has nothing to do with oil control. It is there to reduce the risk of the damper rotating on the nose of the crankshaft, a known issue. If the rubber part of the washer doesn't fit the damper it can be cut off ad the washer used by itself. If it is put on without the rubber part it needs to be tacked to the damper with super glue to hold it during assembly to keep it aligned.
You can assemble without it but your risk of damper spin on the nose of the crankshaft goes up big time and in worse case you stand a risk of having to replace the crankshaft if it does spin. I wouldn't put one together without it. JMHO!
You can assemble without it but your risk of damper spin on the nose of the crankshaft goes up big time and in worse case you stand a risk of having to replace the crankshaft if it does spin. I wouldn't put one together without it. JMHO!
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
Safety Car
Joined: Jan 2004
Posts: 4,974
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From: Pinellas Park Fl
St. Jude Donor '08-'09 & '12, '14
You're using an aftermarket balancer, go nekked and torque to spec.
