Glow plug fouling - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Join the Defender Source Community Today

Thread Tools
Old June 17th, 2014, 11:13 PM
Jackie Treehorn's Avatar
Jackie Treehorn
Status: Offline
1985 (legitimately)
Join Date: Jun 2011
Location: Massachusetts
Posts: 1,989
Glow plug fouling

In the process of doing the timing belt replacement, I removed the glow plugs as instructed and found that one looks oily and more sooty than the others. Is this something I should be concerned about? I didn't notice if it was looser than the others when removing, but maybe the plug wasn't sealed tightly allowing some compression to escape.
What do you think?
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	58
Size:	140.4 KB
ID:	97010  

Reply With Quote
Old June 18th, 2014, 01:09 AM
Viton's Avatar
Status: Offline
Viton Johnnson
Smart 4x4
Join Date: Jan 2009
Location: La
Posts: 1,131
Could be a variety of things. I'd start with a compression test. Since it is oily, could be a valve related problem. Could be a leaking injector. The LR book says to replace injectors every 80K miles, though I did run mine until 125K and the engine was still running smooth with the old injectors. You can have your injectors "pop" tested at a diesel injection repair shop. Keep track from which cyl each comes from.

The glow plugs should be Ohm tested (cold) and the results should be similar, within 0.1 of each other. I only use mine in the winter, as needed, and pull the fuse that makes them work the rest of the year.

Reply With Quote
Old June 18th, 2014, 07:45 AM
Red90's Avatar
Status: Online
John B.
1991 Defender 90, 200TDI
Site Team
Join Date: Sep 2003
Location: Calgary
Posts: 7,880
The seal is at the bottom, where the tip meets the body. Oil above there means it was leaking or oil leaked into the hole from above.

If a tip itself is sooty, it usually mean the plug is not working.
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
Old June 18th, 2014, 08:40 AM
rdavisinva's Avatar
Status: Offline
Robert Davis
Join Date: Oct 2004
Location: USA
Posts: 5,007
John gives a good explanation...

Be sure and replace all with new plugs.

I would also check the injectors to verify that there is not any over fueling which could also give a sooty-er than "normal" glow plug.

Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)
Reply With Quote

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Thread Tools

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help! need STC934 glow plug harness cabell Wanted 29 May 6th, 2015 07:05 AM
Glow plug wiring differences ... Retrofit Defender Technical Discussions 44 January 16th, 2012 10:44 AM
Pin-out for the PRC 6913 glow plug relay? dmarchand Defender Technical Discussions 7 July 10th, 2007 04:51 PM
Glow Plug Relay Michael Defender Technical Discussions 1 March 16th, 2006 02:28 PM
LR Glow Plug relay temp? dmarchand Defender Technical Discussions 0 June 9th, 2004 12:42 PM

» Defender Registry



Ex-MOD 46RN03

Add your Defender

All times are GMT -5. The time now is 04:36 PM.