 Vibration Dampeners, Install on case bolts prior |
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| 930cabman |
 Dec 19 2021, 05:25 PM
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#1
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Advanced Member  Group: Members Posts: 3,058 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States 
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Mistakenly I did not see the memo regarding the installation of the vibration dampeners. Many times I have read the Haynes, Clymer and Factory manuals about the case assembly and saw nothing about the vibration dampeners. I now know the plastic dampeners appear to be fit to the case through bolts and the case half married to the other case half. The factory manual makes no mention of these plastic dampeners. What is the worst thing that could happen if I run without them??
BTW - my first T4 engine build |
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| Highland |
Dec 19 2021, 07:04 PM
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#2
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Senior Member Group: Members Posts: 513 Joined: 8-August 11 From: San Diego, CA Member No.: 13,418 Region Association: Southern California |
Are you referring to the plastic pieces that snap onto the case bolts? I thought they came with the gasket kit and are replaced during rebuild.
I just assumed they kept the bolts centered and prevented any movement from heat cycling and vibration to avoid change in bolt torque. But just a total guess. Waiting for someone who actually knows to chime in (IMG:style_emoticons/default/popcorn[1].gif) |
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| Mark Henry |
Dec 19 2021, 07:21 PM
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#3
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
I've always just thought of them as an assembly alignment/holding tool. I'm totally guessing in theory the engine could cause harmonics that could break the thin case bolts, but I'd need to see the proof of that.
I know it comes down to the old adage that "if VW didn't think the part was needed it wouldn't be there," but it would also be there if it sped up their engine assembly. If you're stressing about it LN sells an ARP case bolt kit for $250. It doesn't use the dampeners, but you need your engine down to the short block to install. I'd never recommend the ARP kit for a stock-ish build...but you're special. (IMG:style_emoticons/default/biggrin.gif) |
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| 930cabman |
Dec 20 2021, 06:55 AM
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#4
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Advanced Member Group: Members Posts: 3,058 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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I was along the same thinking - why would VW/Porsche use something if it wasn't needed??
and it's possible a harmonic could be generated, and tear the case bolts apart ..... Thanks for your insight |
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| krazykonrad |
Dec 20 2021, 07:42 AM
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#5
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Senior Member Group: Members Posts: 1,126 Joined: 21-February 06 From: Canton, GA Member No.: 5,610 |
Could someone post a picture? I've got my engine torn down to the short block and I don't see what y'all are talking about.
Thanks, Konrad |
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| Mark Henry |
Dec 20 2021, 08:00 AM
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#6
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE(krazykonrad @ Dec 20 2021, 08:42 AM)  Could someone post a picture? I've got my engine torn down to the short block and I don't see what y'all are talking about. Thanks, Konrad https://www.thesamba.com/vw/forum/viewtopic.php?p=7629315 (IMG:http://www.914world.com/bbs2/uploads_offsite/www.thesamba.com-26-1640008831.1.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/www.thesamba.com-26-1640008831.2.jpg) |
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| 930cabman |
Dec 20 2021, 10:29 AM
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#7
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Advanced Member Group: Members Posts: 3,058 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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Thanks for digging this up Mark, great information
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| 930cabman |
Dec 20 2021, 02:16 PM
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#8
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Advanced Member Group: Members Posts: 3,058 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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I spoke with a local old timer (trained at the VW school many years ago) a short time ago and he informed me he has built dozens of T4 engines over the years without the plastic vibration dampeners and never an incident.
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| krazykonrad |
Dec 20 2021, 07:21 PM
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#9
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Senior Member Group: Members Posts: 1,126 Joined: 21-February 06 From: Canton, GA Member No.: 5,610 |
Thanks for the pic! No wonder I couldn't see them. They are inside the case.
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