I ejected a spark plug form the cylinder? HELP! |
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I ejected a spark plug form the cylinder? HELP! |
yellow914 |
Jun 11 2009, 10:04 PM
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#1
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Member Group: Members Posts: 183 Joined: 28-March 08 From: San Jose, CA Member No.: 8,861 Region Association: Northern California |
I few weeks ago i posted that my 914 sounded like a harley...with little power. i have now discovered why. I found the spark plug still coonected to the plug wire floating around beneth the fuel injection system?...I tried to reinstall it but nope!...no bite in the threads. Is there a cheap easy fix...or dare I say it...a larger diameter plug I could make work until i can re-do it?
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Derek Seymour |
Jun 11 2009, 10:09 PM
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#2
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Member Group: Members Posts: 394 Joined: 10-March 09 From: Yucaipa Member No.: 10,151 Region Association: Southern California |
Helicoil
(IMG:http://www.boellhoff.cz/test/images/helicoil_vrezu.jpg)(IMG:http://images04.olx.in/ui/1/10/17/1150317_1.gif) It is temporary though. You will need to take your head to a machinist or replace it eventually. |
sww914 |
Jun 11 2009, 10:35 PM
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#3
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Advanced Member Group: Members Posts: 2,439 Joined: 4-June 06 Member No.: 6,146 Region Association: None |
I had to fix one at the racetrack once. My dad had cross threaded it the day before but didn't really say anything. At the track the plug blew out as I was full throttle on the front straight.
It was loud. I hauled butt to the nearest auto parts store and bought a time-sert kit. A time-sert is like a heli-coil but it's solid, not a spring. I spread a thin layer of grease on the tap and tapped the hole, installed the insert, and ran the engine for a couple minutes with the spark plug out to blow any chips out the hole. It was still loud. I put the plug back in and it ran fine. I rebuilt the engine a couple of years later and there was no sign of any scoring or damage in that cylinder. The time-sert was good enough that the machinist that built those heads told me to just go ahead and time-sert the other 3 holes myself. It's been 8 years and they are still good. |
zymurgist |
Jun 11 2009, 10:45 PM
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#4
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"Ace" Mechanic Group: Members Posts: 7,411 Joined: 9-June 05 From: Hagerstown, MD Member No.: 4,238 Region Association: None |
Go with the Time-Sert. It's a much better piece than a Heli-Coil. I had a Heli-Coil let loose on my John Deere head and it tore up the threads.
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Jake Raby |
Jun 12 2009, 06:12 AM
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#5
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
.....and the reason the plug blew out was more than likely because of the crack that you'll find in the chamber leading up to the spark plug hole.
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jmill |
Jun 12 2009, 07:49 AM
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#6
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
I blew 2 plugs once on my VW when a heater hose blew off. I overheated the head and both plugs shot out. I did the Time-Sert. Worked great. I would look at why it blew. Cracked head or cooling issue?
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yellow914 |
Jun 12 2009, 10:20 AM
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#7
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Member Group: Members Posts: 183 Joined: 28-March 08 From: San Jose, CA Member No.: 8,861 Region Association: Northern California |
I was thinking about the reason......anything I do will just be a bandaid. Might need to look for another motor as I have no idea what this one has been through.
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HAM Inc |
Jun 12 2009, 12:55 PM
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#8
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
If it has 1.7 heads it may be cracked. If it has 1.8 or 2.0 914 heads I'd bet a Varsity dog it's cracked!
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Derek Seymour |
Jun 12 2009, 01:05 PM
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#9
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Member Group: Members Posts: 394 Joined: 10-March 09 From: Yucaipa Member No.: 10,151 Region Association: Southern California |
If it has 1.7 heads it may be cracked. If it has 1.8 or 2.0 914 heads I'd bet a Varsity dog it's cracked! (IMG:style_emoticons/default/agree.gif) That's why I suggested the Helicoil as a temporary fix. They are usually half the price of a time-sert kit and there's no reason to spend extra $$$ on something that you are going to replace anyway. I had this trouble on my 71 Super Beetle and used a time-sert to fix it. But that also blew out. When I took my head off... yep... cracked. |
Katmanken |
Jun 12 2009, 09:56 PM
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#10
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
Only time I've seen an insert work is when somebody cross threads a spark plug into a head and when the plug is removed, the threads come with it... (IMG:style_emoticons/default/shades.gif)
Worked for me on my bug. The dealer had a small round plate with a threaded insert on it, They tapped the hole, threaded the insert into the hole until the plate was against the head, and punched a dimple or two into the plate and the head. Car ran fine for 250K. |
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