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PostPosted: Thu Oct 25, 2018 11:03 am 
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Location: Dearborn, MI
Year and Trim: '93 SSEi
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'97 LeSabre
Does anybody know what size or have a part number for the oring on the top vacuum tee on the M90's? Mine is stretched and cut apparently...

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The Fleet:
'93 SSEi - Twincharged + manual Build thread
'97 Camaro - Top swap
'05 STS - V8, AWD, her DD
'92 Trofeo - Fair weather DD
'84 Sierra Classic - Twin turbo 3800
'97 LeSabre - Top swap
'99 Montana - top swap 3800

Current project:
upkeep on K2500 and 97 LeSabre

Upcoming projects:
'92 Bonneville SSE
'87 LeSabre T-type
'67 LeSabre

RIP:
'86 LeSabre - pictures
'93 SE - L67


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PostPosted: Thu Oct 25, 2018 11:36 am 
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Joined: Tue Aug 25, 2009 8:32 pm
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Location: Dearborn, MI
Year and Trim: '93 SSEi
'05 STS-4
'97 Camaro
'97 LeSabre
Found the OE part number: 24503492 O-RING SEAL-0.864

It's discontinued. Still searching for what size it is..

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Blow all the things! Wait, I meant boost. Boost!
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The Fleet:
'93 SSEi - Twincharged + manual Build thread
'97 Camaro - Top swap
'05 STS - V8, AWD, her DD
'92 Trofeo - Fair weather DD
'84 Sierra Classic - Twin turbo 3800
'97 LeSabre - Top swap
'99 Montana - top swap 3800

Current project:
upkeep on K2500 and 97 LeSabre

Upcoming projects:
'92 Bonneville SSE
'87 LeSabre T-type
'67 LeSabre

RIP:
'86 LeSabre - pictures
'93 SE - L67


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PostPosted: Thu Oct 25, 2018 12:38 pm 
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This site indicates that they have it in stock, as well as giving the dimensions.
http://oemcats.com/oem-parts/24503492.html

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PostPosted: Thu Oct 25, 2018 12:45 pm 
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They are always stretched out. I tried a couple different ones from my standard o-ring kit and got one to work. I'm assuming you have the vacuum tree, just grab some and start test fitting...

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PostPosted: Fri Oct 26, 2018 9:28 am 
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Joined: Tue Aug 25, 2009 8:32 pm
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Location: Dearborn, MI
Year and Trim: '93 SSEi
'05 STS-4
'97 Camaro
'97 LeSabre
I ended up with two different O-rings to try. The first is metric, 22mm ID x 2.5mm cross-section, the other standard 7/8 ID x 3/32 cross section - which is as close to the sizes listed in the link above I could find locally.

Both are a tight fit, need some grease to get the vac manifold installed again, but they work.

_________________
Blow all the things! Wait, I meant boost. Boost!
Image

The Fleet:
'93 SSEi - Twincharged + manual Build thread
'97 Camaro - Top swap
'05 STS - V8, AWD, her DD
'92 Trofeo - Fair weather DD
'84 Sierra Classic - Twin turbo 3800
'97 LeSabre - Top swap
'99 Montana - top swap 3800

Current project:
upkeep on K2500 and 97 LeSabre

Upcoming projects:
'92 Bonneville SSE
'87 LeSabre T-type
'67 LeSabre

RIP:
'86 LeSabre - pictures
'93 SE - L67


Top
 Profile  
 
PostPosted: Thu Sep 10, 2020 10:17 pm 
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Joined: Tue Aug 25, 2009 8:32 pm
Posts: 4680
Location: Dearborn, MI
Year and Trim: '93 SSEi
'05 STS-4
'97 Camaro
'97 LeSabre
I was searching for this again tonight, figured I would update this thread since it's one of the first google hits.

GM original part number is 24503492 - of course it's discontinued. The description is 0.864", other dimensions I could find are 0.1x1.1x1.1

The stretched out O-ring measures close enough that 0.1" is the cross section (2.54mm). Since it's stretched out, the original cross section would have been slightly thicker than this (0.103/2.62mm is the actual measurement of the "0.1/2.5mm" standard).

The vacuum tee OD (the seal ID fit) is 0.868" (22mm). The hole in the supercharger case is 1". The supercharger is a counterbored hole, 0.377" deep (9.6mm). The shoulder on the vac tee is 0.232" deep (5.9mm)

Based on the measurements, this is an axial seal oring with 10% compression. The closest standard size is -118 (7/8 ID, 1-1/16" OD, 3/32" CS).

Since this is a vacuum tee oring, it only has to seal against air and moisture and heat, right? Wrong, that's why they are stretching out like hell. The oring appears to be EPDM - I say that based on results, since there doesn't appear to be an industry standard for colorant in the material. Usually, black=EPDM, brown=nitrile, green=HNBR, blue=Flourosilicone, but that doesn't apply to automotive where O-rings can be color coated as an assembly aid and to save cost no colorant added to the base stock, and the color coating can peel off or ooze out over time. Anyhow, EPDM is chemically incompatible with motor oil, which it is exposed to thanks to the PCV system, and swells (expands, stretches, etc) beyond usable. It's fair to note at this point that "chemically compatible" is relative and is graded on a scale. EPDM fits the symptoms. Also, when I say chemically compatible o-rings are HNBR, viton, and flourosilicone, I mean that they have less than 10% swell and are within the recommended temperature ranges.

_________________
Blow all the things! Wait, I meant boost. Boost!
Image

The Fleet:
'93 SSEi - Twincharged + manual Build thread
'97 Camaro - Top swap
'05 STS - V8, AWD, her DD
'92 Trofeo - Fair weather DD
'84 Sierra Classic - Twin turbo 3800
'97 LeSabre - Top swap
'99 Montana - top swap 3800

Current project:
upkeep on K2500 and 97 LeSabre

Upcoming projects:
'92 Bonneville SSE
'87 LeSabre T-type
'67 LeSabre

RIP:
'86 LeSabre - pictures
'93 SE - L67


Top
 Profile  
 
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