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Join Date: May 2003
Location: Los Angeles, CA
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Stripped spark plug hole options?
On cylinder 4, my spark plug goes in about half way, then stops. I've never noticed this before because the engine seemed to run fine. However, it's probably in my interest to somehow get it fixed or something. What options are available for repairing a stripped spark plug hole?
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'86 951 blk/blk -968 M030 Sway Bars with delrin bushings -IceShark headlight kit -Koni Yellow Sport Adjustable struts and shocks -225 lb springs up front Cleaned grounds = happy 944 WTB: 951 black passenger door/fender |
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06-01-2004, 09:39 PM
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Burn the fire.
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Hmmm... not sure, but that sounds quite scary... Weld up the hole and re-drill and tap it with the right thread size?
Try using a thread cleaning tool first... but the shavings will fall right into the compression chamber... Hmm... not sure
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[x] Working | [_] Broken: 2017 Victory Octane [x] Working | [_] Broken: 2005 Ram 1500 SLT w/5.7L Hemi "Drive it like you stole it." |
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06-01-2004, 11:55 PM
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Location: Phoenix, AZ
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heli-coil
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87 951, K27/6, Almond Beige, 17" Turbotwist 87 944S, alpine white, 5sp died a violent death 84 944, silver/brown, auto, gone but not forgotten "may the force be with you" |
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06-01-2004, 11:57 PM
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Quote:
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Still looking for the right deal on another P-car 1968 BMW 1600 2 liter 1956 Ford F250 1955 BMW R69 1999 Range Rover Callaway #011 of 220 (Yeah, as in Callaway Corvette...) |
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06-02-2004, 12:15 AM
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Okay, I'm not sure if it makes a difference, but it's cross threaded at the top, not stripped. The spark plug goes in at a slight angle (the tip of the spark plug isn't in the middle of the spark plug hole) and eventually it stops. The top 1/3 of the spark plug hole is shiny from being cross threaded while the rest of the threading is dirty. Heli-coil will require removing the head, right? Any other ideas besides heli-coil?
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'86 951 blk/blk -968 M030 Sway Bars with delrin bushings -IceShark headlight kit -Koni Yellow Sport Adjustable struts and shocks -225 lb springs up front Cleaned grounds = happy 944 WTB: 951 black passenger door/fender |
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06-02-2004, 12:20 AM
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Any ideas on this thing?
http://www.europeancarweb.com/auto_tools/0402ec_tool/ I'm almost 100% sure it's cross threaded at the top 1/3 and the bottom 1/3 looks to be fairly in tact. So, maybe backing it out will work? I also read something about heli-coiling while vacuuming through the intake or exhaust with the intake or exhaust valves open. Any ideas on that?
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'86 951 blk/blk -968 M030 Sway Bars with delrin bushings -IceShark headlight kit -Koni Yellow Sport Adjustable struts and shocks -225 lb springs up front Cleaned grounds = happy 944 WTB: 951 black passenger door/fender |
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06-02-2004, 12:28 AM
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OK, no guarrantees, pack the hole with grease, not to much, you don't want to get to much into the cylinder, and go at it with a thread chase tap, carefully. Once you get the threads staight, use Qtips to clean up the grease, then use something like mineral spirits to clean the residue and vacuum the area repeated ly throughout the whole process to collect all the shavings. Good luck, and once again, no guarrantees.
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Still looking for the right deal on another P-car 1968 BMW 1600 2 liter 1956 Ford F250 1955 BMW R69 1999 Range Rover Callaway #011 of 220 (Yeah, as in Callaway Corvette...) |
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06-02-2004, 12:30 AM
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Okay, I'm getting that back tap. One last question: 944 Turbo's have 14 mm spark plug threads, right? Thanks, just wanna make sure.
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'86 951 blk/blk -968 M030 Sway Bars with delrin bushings -IceShark headlight kit -Koni Yellow Sport Adjustable struts and shocks -225 lb springs up front Cleaned grounds = happy 944 WTB: 951 black passenger door/fender |
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06-02-2004, 01:34 AM
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Uhhhhhh...
This is kinda scaring me. Has the head gasket ever been changed? If not, might I suggest another option. Pull the head...really not that hard. Send it to a machine shop. Get new valve guides and the whole shebang done there(should be <150). New gaskets up top. Peace of mind. I personally would leave well enough alone until I was ready to do the job above. Just my .02
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83 944 white w/Boxster wheels Planned mods- custom leather interior, 968 antenna, soundsystem, 968 style rockers, clear sidemarkers
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06-02-2004, 06:51 AM
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I've used just a greased up K-D Tools (or Lisle?) thread chaser for 30 years on aluminum heads. Just leave the spark plug out and start the car. The engine's compression will blow out all the remaining chips in the hole.
Edit: Looks like this one though I don't recall it being a Performance Parts product. 
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! Last edited by SoCal Driver; 06-02-2004 at 08:34 AM.. |
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06-02-2004, 08:18 AM
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Found it!
K-D tools: 14 AND 18MM SPARK PLUG OPENING THREAD CHASER KD 730 $4.95 Clean and restore spark plug threads. Use with a 13/16" socket. Rubber ring eliminates slipping. Tool services most cars. Here is the link:http://www.libertytools.com/kd/kdengi11.html
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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06-02-2004, 08:37 AM
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what he said.
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06-02-2004, 08:48 AM
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....at least you only cross threaded the hole.... If you chase the threads out you may get some particles but they will be so small that they shouldnt cause any havoc with the exhaust turbine...
Just go slow ...1/4 turn forward... back it out.... then feel some resistance .... 1/4 turn forward .... back it out.. etc
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Alex - PCA Polar Region - Boxster Muncher 86' 944 Turbo - Megasquirt - 326 rwhp/340lbft @ 18 psi SOLD www.edmontonhomelife.com www.edmontonrealestate.ws |
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06-02-2004, 08:53 AM
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Now THAT doesn't worry me.
Nice product.
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83 944 white w/Boxster wheels Planned mods- custom leather interior, 968 antenna, soundsystem, 968 style rockers, clear sidemarkers
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06-02-2004, 09:38 AM
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Hm, I was just gonna try a normal thread chaser but I'm a little it concerned that I might catch onto the cross threading and just send the bad threading further down and ruin the good threads. Is this possible/likely?
The more I read about Starr Product's Back-Tap, the more I want to try it out. Supposidly the tool is able to compress and start from the good threads at the bottom then work its way up and "repair" the bad ones at the top. This seems like a good idea since I'm worried about cross threading further down if I start from the top. Any opinions? Waste of my money or worth a try? Here's a video that Starr Products put out about the Back-Tap: http://www.starrproducts.com/mov/Back%20Tap.wmv And here's a description of the product: http://www.starrproducts.com/backtap.html TIA, Matt
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'86 951 blk/blk -968 M030 Sway Bars with delrin bushings -IceShark headlight kit -Koni Yellow Sport Adjustable struts and shocks -225 lb springs up front Cleaned grounds = happy 944 WTB: 951 black passenger door/fender |
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06-02-2004, 11:49 AM
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The spark plug thread size is 14 mm, right?
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'86 951 blk/blk -968 M030 Sway Bars with delrin bushings -IceShark headlight kit -Koni Yellow Sport Adjustable struts and shocks -225 lb springs up front Cleaned grounds = happy 944 WTB: 951 black passenger door/fender |
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06-02-2004, 08:10 PM
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2017 Victory Octane
2005 Dodge Ram 1500 SLT
1983 Porsche 944 2.5 liter
