[SaskV]

I have searched but couldn't find any reference to this part... I found this seal/gasket/washer (not sure what it's called) on the hub of the factory balancer when I removed it. Just wondering if I should use it on the hub of the ATI balancer before I install it.

THANKS in advance!

Photos for reference below;

 

[SaskV]

It’s a high friction washer. It keeps the balancer from rotating any. Brian Tooley explained it to me at an open house. They used to sell them. They’re supposed to be one time use. I replaced mine on my new motor with my ATI balancer.

GM #12578073. It might come without the rubber but it works the same.

Thanks for the replies (and the PN Mike) ! I know it wasn't a seal even though I used that word .

 

[SaskV]

When I put the ATI damper on my engine I didn't install one, hopefully it won't impact the belt alignment. I had them add a second keyway in my Callies crank so I'm not sure I could have installed one anyway without modifying it. Also ATI mentions a groove in the hub for it which I didn't see in the ATI hub I have My hub was just tapered at the end, but if I'm seeing your hub in the background of the first pic it looks like it's made for one.

How thick is the washer?

The flat metal washer part is about .005. As the instructions call it a "friction" washer below.

Here's a couple of photos of the hub without the washer (top) and and with (bottom)

From ATI

"Depending on the year of your engine / vehicle you may notice a thin “friction” washer behind the damper hub in front of the first oil pump gear. This washer should be left in place and will not hurt anything if you are or are not pinning or keying your crankshaft. If your year does not have this washer and you would like to add one, there must be a machined “lip” provision on the back of the hub to do so."

Yep, there it is, #2 on "installing the hub on the crank"... I should have "read" the instructions I guess... sheesh! 🤦‍♂️

Thanks, I appreciate the replies!

 

[SaskV]

After all of this I "carefully" installed the balancer the other night and all went well. Carefully in quotations because today... TODAY, I find the &%$#@ friction washer ON THE DAMN FLOOR in the corner by the front of the car. AYFKM??? Where's the largest face-palm emoji I can find! 🤦‍♂️ I MUST have knocked it off somehow without noticing before I slid the balancer on the front of the crank. OMFG, I can't believe it !

Do I remove the balancer (I really don't have the proper puller for the ATI balancer) or just call it good? 🤷‍♂️ (feeling dumb, but ready to accept it LOL)

 

[SaskV]

I guess now you get to run through the jungle bare bottomed like me

🤣🤣

 

[SaskV]

If it were me, I'd be pulling it back off to put the washer on but I'm OCD like that. But I don't think it will cause any harm to leave it off, especially if it was the original (used) washer.

The ATI balancer comes off with a regular 3 bolt balancer puller that you can find at any auto parts store.

I am very much in the OCD crowd! Thanks Mike, I suspected it came off with a standard puller ! Stay tuned, I am very likely going to pull and replace!

 

[SaskV]

Aaaand just to close the loop, I couldn't sleep knowing I missed the friction washer, so I am happy to report that I corrected that today!

And yes, coffee DOES make me feel less murdery!!