 melted plug |
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| Kevin@ojai.net |
 Jan 12 2004, 09:50 PM
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#1
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Member  Group: Members Posts: 158 Joined: 9-July 03 From: Ventura & Chico, CA Member No.: 899  |
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Replies(1 - 12)
| Aaron Cox |
Jan 12 2004, 09:54 PM
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#2
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
wtf happened??? (IMG:style_emoticons/default/ohmy.gif)
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| mightyohm |
Jan 12 2004, 09:59 PM
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#3
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Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest  |
How the heck can that even happen???
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| ArtechnikA |
Jan 12 2004, 10:36 PM
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#4
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
QUOTE(jkeyzer @ Jan 12 2004, 07:59 PM) How the heck can that even happen??? "AC/Delco" ... |
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| JeffBowlsby |
Jan 12 2004, 10:45 PM
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#5
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914 Wiring Harnesses Group: Members Posts: 8,533 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None 
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Any head damage?
JB |
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| Gary |
Jan 12 2004, 10:54 PM
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#6
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Senior Member Group: Members Posts: 744 Joined: 12-January 03 From: Mount Airy, MD Member No.: 134 Region Association: MidAtlantic Region
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Look at pic 29. Looks like that plug hole is toast.
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| Bleyseng |
Jan 12 2004, 11:08 PM
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#7
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Aircooled Baby! Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Time to have that welded back up....yikes!
Geoff |
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| Kevin@ojai.net |
Jan 12 2004, 11:17 PM
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#8
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Member Group: Members Posts: 158 Joined: 9-July 03 From: Ventura & Chico, CA Member No.: 899 |
Yea, the hole has similar melt damage as the plug. Last night when I first discovered this problem I put in a different plug. The plug threaded in effortlessly. I fired her up, and she ran on all 4, but it didn't sound quite right, almost like a knock, but not... This afternoon I fire her up again, SHWOOSH, SHWOOSH, with 3 cyls firing and the 4th coming & going every few revs... Well, I guess that answered my question about the head. I couldn't see a thing from looking in, so I took about 15 or so pictures of the hole. I got one picture that had enough light and I could see the damage (the picture I uploaded). Looks like I'll have to pull the head (again) and fix/replace it depending on how it looks after CLOSE inspection.
I also took the plug around to a few different shops I know around town today. All but one of the shop owners said "Shit, I've never seen one like that before..." The local VW/import (not rice) shop owner put on his reading glasses, looked it over for a few seconds, and said "Yea, I've seen something like that before." I'll let you guys guess on what could have caused it before I say what John (shop owner) said he thought could have caused this. FUN, FUN, FUN! Any one notice these cars lead to (IMG:style_emoticons/default/beer3.gif)? -Kevin |
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| Gary |
Jan 12 2004, 11:34 PM
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#9
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Senior Member Group: Members Posts: 744 Joined: 12-January 03 From: Mount Airy, MD Member No.: 134 Region Association: MidAtlantic Region
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Looking at the plug, I'd guess the badness started at the junction between the insulator and threads. Over time, combustion gasses through the body of plug and - ugly.
Close? BTW, what brand plug? I've always been partial to NGKs. |
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| Kevin@ojai.net |
Jan 12 2004, 11:53 PM
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#10
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Member Group: Members Posts: 158 Joined: 9-July 03 From: Ventura & Chico, CA Member No.: 899 |
By close inspection, I meant careful inspection. I guess I wasn't really clear. They were Delco's...
-Kevin |
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| rick 918-S |
Jan 12 2004, 11:56 PM
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#11
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Hey nice rack! -Celette Group: Members Posts: 20,493 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region 
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OMG! Thats going to leave a mark!
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| McMark |
Jan 13 2004, 12:50 AM
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#12
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
The heads had previously had the threads galled (missing parts of the threads) and that lead to a combustion leak which over time (a few minutes?) burned that hole. If you had caught it while it was running you might have seen the flame jet shooting out.
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| Kevin@ojai.net |
Jan 13 2004, 04:21 PM
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#13
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Member Group: Members Posts: 158 Joined: 9-July 03 From: Ventura & Chico, CA Member No.: 899 |
My local VW expert told me that he has seen a couple plugs that looked just like mine come out of T4's over the years. He said it all starts with a small crack in the head which gasses are forced through. Soon this crack starts to grow and the SP hole and the plug turn into the melted mess I carried into his shop. Nothing I can do about it now though...
-Kevin |
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