joshbuys Posted May 21, 2010 Share Posted May 21, 2010 2008 F250 126,000 miles. Oil field service truck. Replaced injectors 1,3,4,5,6,7,and 8 two weeks ago - had a miss on 5 and 6. Customer requested replace all others except the one we did in January(number 2) went on a 4 day vacation after repairs....come to find out when I got back the truck had come back 2 days later with a CEL on. Other tech(not diesel certified....both myself and my brother in-law(the other diesel tech in the shop)) were on vacation together(family stuff in California) had looked at it and ordered a glow plug harness because "I couldn't get the seal to go into the hole in the valve cover, I ohmed out the harness and it was open on #2." So the truck comes back in for the harness that had been ordered, it's given back to me at this point, so I look at the old harness and see the seal is about a half inch(13mm(12.7mm if you want to get real technical) for you northerners) away from touching the valve cover. pull back on the harness and attempt to seat it - feel it clip onto the glow plug, but still sitting just as far back from the valve cover.....This is odd....try one more time for good measure - same result. Pull the glow plug.....ah hah!!!! I have never seen this before! Has anybody else? I contacted hotline and was told - possible heat fatigue, but there have been no reported issues of this nature.... Gave the new harness back to parts since the old one was fine....measure the harness when you ohm the wire, not the harness to ground....told parts not my fault, sorry you have to take it back, but you can take it up with SM or other tech since it was ordered in.... Quote Link to comment Share on other sites More sharing options...
Mikill Posted May 24, 2010 Share Posted May 24, 2010 I have seen it once. I did a shortblock on one and it came back a couple of days later and glow plug had come apart and completely shot out of truck. Quote Link to comment Share on other sites More sharing options...
Alex Bruene Posted May 24, 2010 Share Posted May 24, 2010 I've seen it a few times. I actually had an Econoline once that just about fired the center of a glow plug through the firewall when it popped out. Quote Link to comment Share on other sites More sharing options...
Fordracer Posted May 24, 2010 Share Posted May 24, 2010 I had one blow out on a low mile truck. It came back a year later with another one on the same bank blown out. Got the okay from Ford to replace all the other glow plugs. Quote Link to comment Share on other sites More sharing options...
Jim Warman Posted May 25, 2010 Share Posted May 25, 2010 This drops quite neatly into the "shit happens" bin. I've seen spark plugs do this very same thing on gas engines.... Being the jaded old phuque that I am, I find it surprising that anyone would find it surprising... But that's just me. Quote Link to comment Share on other sites More sharing options...
Aaron Posted May 26, 2010 Share Posted May 26, 2010 I had an old shitbox 4.9L Caddy darken my doorstep at the indy garage many moons ago, that did this to 3 or 4 of the sparkplugs... It had gotten so down on power since it spit the last one out, the customer finally decided to fix it. Quote Link to comment Share on other sites More sharing options...
Mikill Posted May 26, 2010 Share Posted May 26, 2010 I had an old shitbox 4.9L Caddy darken my doorstep at the indy garage many moons ago, that did this to 3 or 4 of the sparkplugs... It had gotten so down on power since it spit the last one out, the customer finally decided to fix it. I guess he didn't mind that loud popping noise while it was running. Quote Link to comment Share on other sites More sharing options...
ChristopherH Posted August 17, 2010 Share Posted August 17, 2010 We just fixed one that the glow plugs on the left bank had seperated and repeatedly failed (3 seperate times). They were from out of the area and their home dealer just kept installing new glow plugs and harness as needed. It came here with an overheating concern and blowing white smoke out of tailpipe. Pressure testing EGR coolers--both passed, but system would not hold vacuum with airlift with no external leaks. After removing cylinder heads, found the Left Bank cylinder head with visual cracks between the valves and the glow plugs had started to seperate again--looked like heat damage to insulator between outer sleeve and center piece. Just saw this thread and thought I would add that to it. Quote Link to comment Share on other sites More sharing options...
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