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Possible Top Pin Cup Solution


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#1 MemphisMan

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Posted 20 March 2017 - 07:54 PM

jman093 (Jesse) advertised some valve stem seals with some random parts on here last year. I thought the seals looked a lot like vert top pin cups so I bought a few. I haven't tried to put these on my car, but they do fit over the top pin nicely. The seals are shorter than the plastic cups, but it might not matter because the pins will go all the way through. Can someone verify if this matters? Also, I'm not sure how they attach to the windshield header so I'm not sure if the stock fastener will work. Can someone post a pic of the stock fastener and about how far up on the shaft it normally goes?Jesse, do you remember what application did the seals come from?Here are some pics of an original plastic one beside the slightly smaller valve stem seal. You can see on the last pic how the top pin goes all the way through the seal, but it might not matter.Attached File  C9B3E1EA-.jpg   53.18KB   6 downloadsAttached File  7CF694A2-.jpg   63.66KB   5 downloadsAttached File  32CC352B-.jpg   33.57KB   3 downloadsAttached File  BB6595A2-.jpg   32.86KB   3 downloadsAttached File  IMG_4950.JPG   89.88KB   3 downloadsAttached File  IMG_4956.JPG   81.01KB   3 downloadsAttached File  IMG_4951.JPG   72.69KB   3 downloadsAttached File  IMG_4952.JPG   79.2KB   3 downloads
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#2 oldmangrimes

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Posted 20 March 2017 - 09:47 PM

Maybe you could email Enginetech or Mahle or some other valve stem seal manufacturer with the pin cup dimensions and ask if they have one close to those dimensions?   They are called "umbrella seals", I think.   The catalogs I've seen are only set up by engine year and size.   

I need to replace my pin cups, I've seen a couple alternate solutions posted over the years but I'm willing to try these.   

 

Someone suggested 3D printing but I would be concerned about the UV durability of some of the 3D printing materials, the pin cups see direct sunlight and would damage some plastics.   



#3 jman093

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Posted 21 March 2017 - 04:01 AM

It's GM part number 12482062. It fits some 3500s, all 3900s, and lots of LS V8's.


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#4 MemphisMan

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Posted 21 March 2017 - 05:46 PM

I bought some external spring clips this morning. I'm going to try and dremel a couple of small slits in the valve seat and see if I can get them secured to the extra header I have.
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#5 oldmangrimes

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Posted 23 March 2017 - 05:07 PM

MemphisMan, please post of picture of it if it works, it sounds like a good idea.



#6 94 olds vert

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Posted 23 March 2017 - 05:28 PM

The seals being shorter shouldn't make much of a difference. The way it is secured might need to be addressed. You can see that the washer is near the bottom of the pin cup.Attached File  IMAG0697.jpg   31.92KB   2 downloads
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#7 sean1991olds

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Posted 24 March 2017 - 03:11 PM

It's GM part number 12482062. It fits some 3500s, all 3900s, and lots of LS V8's.

So what is the actual part number of this pin cup... all this talk about these things is making me dread having to replace mine (if I ever have to)! Is it listed on this page? - http://www.wholesale...1/12517047.html

Just curious to know what it is on the diag.. obv it is not something you can come by searching for the number.


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#8 Imp558

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Posted 24 March 2017 - 03:50 PM

The seals being shorter shouldn't make much of a difference. The way it is secured might need to be addressed. You can see that the washer is near the bottom of the pin cup. IMAG0697.jpg

can you use a hacksaw or tubing cutter to put a groove in it? I bet that washer would snap in and hold like a mofo then..

Edited by Imp558, 24 March 2017 - 03:51 PM.

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#9 94 olds vert

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Posted 24 March 2017 - 04:24 PM

A snap washer would work really good, and probably hold it better than the factory washer. Put a grove in the outside of the valve seal and then put a snap washer on it when in the header.

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#10 Imp558

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Posted 24 March 2017 - 05:41 PM

Yeah, a snap ring, the star type like before would be a bitch to remove. Good idea.

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#11 MemphisMan

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Posted 24 March 2017 - 08:37 PM

I experimented on this last night. I didn't get to the solution, but wanted to update everyone on progress. I took the valve stem seal, along with a rubber grommet and external spring clip (both bought from Lowes).Attached File  5D4286A4-.jpg   80.31KB   1 downloadsI then inserted the grommet into the hole on the spare windshield header I have.Attached File  B37B7F2A-.jpg   54.58KB   1 downloadsThen I cut 3 small groves in the valve stem seal with a dremel so the external spring clip can lock around the valve stem seal and test fitted the spring clip. It locks nice and tight around the valve stem seal.Attached File  IMG_4975.jpg   30.29KB   1 downloadsThen I inserted the valve stem into the grommet and put the spring clip on. Nice and tight fit and all is good right? Nope.Attached File  IMG_4977.jpg   75.17KB   1 downloadsWhat I didn't account for is the windshield frame. The windshield header (which is what I mounted the valve stem seal in) mounts to the windshield frame. There's a hole in the windshield frame directly under the hole in the windshield header.Attached File  Picture1.jpg   39.26KB   1 downloadsThe original cup is longer so it can pass through both the windshield header and the windshield frame with enough length to attach the locking washer.Attached File  IMG_4980.jpg   24.68KB   2 downloadsAs you can see, the valve stem seal isn't long enough to pass through both header and frame. Attached File  IMG_4987.jpg   27.38KB   2 downloadsAttached File  IMG_4984.jpg   95.58KB   2 downloadsIt looks like it comes through far enough, but it doesn't. This pic was taken with the rubber grommet removed...the valve stem seal just isn't long enough. This would work if you wanted to remove the header, secure the valve stem seal to the header as I've shown, then put the header back on the frame. I'm going to look for some longer valve stem seals and see what I can come up with.

Edited by MemphisMan, 24 March 2017 - 08:44 PM.

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#12 MemphisMan

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Posted 24 March 2017 - 08:42 PM

So what is the actual part number of this pin cup... all this talk about these things is making me dread having to replace mine (if I ever have to)!Is it listed on this page? - http://www.wholesale...1/12517047.htmlJust curious to know what it is on the diag.. obv it is not something you can come by searching for the number.

Not sure of the actual part number, but the number 445027 is stamped on the cup.
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#13 94 olds vert

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Posted 24 March 2017 - 08:42 PM

The look from the top is great. Way better than the old plastic ones.

cjvoYas_zpstbntteeh.jpg. 1994 Cutlass Supreme Convertible [2Q 2012 COTQ] 2000 Grand Prix GTP 2015 GMC Sierra Z71


#14 oldmangrimes

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Posted 24 March 2017 - 09:55 PM

What is the length of the original pin cup?   I'm looking at a McMaster-Carr catalog of flanged sleeve bearings, there might be something that fits or can be cut to fit.  I used the diameters from the GM 12482062 spec, but I couldn't find a length spec.   



#15 94 olds vert

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Posted 24 March 2017 - 10:01 PM

Roughly 1 1/16 inches. Should be pretty close. Attached File  IMAG0692.jpg   39.19KB   2 downloads

Edited by 94 olds vert, 24 March 2017 - 10:02 PM.

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#16 Imp558

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Posted 24 March 2017 - 11:12 PM

What kind of metal are those made of? It's easy to zinc plate.

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#17 pshojo

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Posted 08 April 2017 - 11:59 AM

Interesting.




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