TheDieselPage.com Forums
 
The Diesel Page Forums

2019 - TDP's 23rd Anniversary
What's New | Feature Articles | Product Reviews | Member's Area | Free Forum Registration
Duramax 6600 Diesel Page | Advertiser's Section | Classified Ads | The Diesel Page - Publications


Go Back   TheDieselPage.com Forums > The Diesel Page Forums > 6.2L Diesel
Register FAQ Members List Photo Album Mark Forums Read

6.2L Diesel 1982-93 6.2L Diesel - Welcome to the Internet's first discussion forum for the 6.2L engine.

Reply
 
Thread Tools Display Modes
  #1  
Old 02-09-2019, 08:28 AM
Mastiff37 Mastiff37 is offline
Newbie
 
Join Date: Feb 2019
Location: Tucson
Posts: 3
Default Another stuck glow plug thread

I've read through a bunch of threads on the forum, mostly about swollen tips. My old 1986 CUCV has its original plugs and my deal is that they don't want to unscrew at all. They look fragile and I'm afraid to snap them off. Any advice on how hard I should crank on them, or other tricks for getting them started?
Reply With Quote
  #2  
Old 02-09-2019, 10:19 AM
DmaxMaverick's Avatar
DmaxMaverick DmaxMaverick is offline
Administrator
 
Join Date: Apr 2001
Location: CA
Posts: 12,216
Arrow

Welcome aboard!

You're right to be cautious. They can be easily twisted off, easier than a spark plug. It's easiest to remove them with the head off, but they can be removed in place. I highly recommend removing the injector on the cylinder you're working on. Plug the flash hole in the pre-cup to prevent anything from falling into the cylinder. The plugs are metal (obviously), but most have a porcelain core. Start by a liberal soaking of the threads with PB Blaster, repeated several times for days. You can also add some heat with a propane torch, heat-cycling several times, then trying removal once it isn't too hot. While it's very hot, you can try wicking the threads with a crayon, then let it cool before removal. If you twist one off, it'll have to be drilled then removed with an EZ Out. I like the spiral type for these. The square type can really cause a problem if you break one in the hole, usually requiring head and pre-cup removal.

If you're able to thread them out, but they are swelled and won't pull out, remove the injector, plug the flash hole, break it off and push the tip back into the pre-cup. Use a shop vac at the injector hole, or high pressure shop air through the GP hole to remove the pieces. be careful to not blow the flash hole plug into the cylinder. I like to use a strip of inner tube, tightly rolled and twisted into the flash hole. They usually fit tight and stay put, and are easily removed when done. An added benefit is, if you forget them, they will burn off, harmlessly, once the engine is started.
__________________
1985 Blazer 6.2
2001 GMC 2500HD D/A
2014 Chevy Cruze Diesel - Fabulous car, no problems at all, but sold Nov. 2016 @ 55K miles.
dmaxmaverick@thedieselpage.com
Reply With Quote
  #3  
Old 02-11-2019, 07:30 AM
Mastiff37 Mastiff37 is offline
Newbie
 
Join Date: Feb 2019
Location: Tucson
Posts: 3
Default

Thanks for the help. Surprisingly, after just one night soaking in PB Blaster, the plugs are coming loose. I ordered the Kennedy Dieseling plugs for replacement, so will keep soaking the old ones until they arrive to loosen them up as much as possible. I haven't pulled any all the way out yet, so hopefully not too many will be swollen and hard to get out. If so, I see many threads on that topic.
Reply With Quote
  #4  
Old 02-11-2019, 08:57 AM
DmaxMaverick's Avatar
DmaxMaverick DmaxMaverick is offline
Administrator
 
Join Date: Apr 2001
Location: CA
Posts: 12,216
Arrow

It may not be that bad. When you get one out, check the part number on the plug. If it's anything but a AC/9G, or off brand (non-AC), chances are none will be swelled. A bit of soot buildup on the plugs can act like they're swelled. If they seem to stick coming out, spray some PB Blaster in the hole with the plug as loose as it can be (under the threads), then push, pull, twist, repeat until out. Clean the GP holes with a (gun) bore brush and some PB before installing new plugs. Use some anti-seize on the threads.
__________________
1985 Blazer 6.2
2001 GMC 2500HD D/A
2014 Chevy Cruze Diesel - Fabulous car, no problems at all, but sold Nov. 2016 @ 55K miles.
dmaxmaverick@thedieselpage.com
Reply With Quote
  #5  
Old 02-16-2019, 10:39 AM
Mastiff37 Mastiff37 is offline
Newbie
 
Join Date: Feb 2019
Location: Tucson
Posts: 3
Default

Thanks for the advice. They all came out easily except one, which was slightly mushroomed. I almost gave up, but tried prying lightly with a screwdriver while unscrewing and it eventually walked out. Starts in one crank now.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -7. The time now is 01:42 PM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright 1996-2019 by TheDieselPage.com - All Rights Reserved