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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 10-01-2015, 05:10 PM   #1 (permalink)
tjg
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I changed my #4 glow plug today

A few days ago when I went to start my truck, glow plug light wouldn't turn off right away. Check engine light stayed on as well. I knew from past experience that it was time for another glow plug replacement.

I know I should've changed them all right from the get go, but I didn't. Plugged in the code reader and it confirmed. P0674 is what I got.

#4 is on the driver side right behind the steering shaft. 8mm is used to take off the nut, and 12mm is used to take out the glow plug.

Glow plug would not loosen. Tried and tried for about 45 minutes. Sprayed WD40 a few times ... to no avail. Did some research and found some people used PB blaster. Time to go to the auto parts store. On the way, I called my local shop to see how much they would charge to replace the glow plug in case I couldn't get it out. $100:jaw drop:

After getting the PB blaster, I got home and sprayed the glow plug and waited for about 5 minutes. Tried it again, nothing. Sprayed some more and waited another 5 minutes. Tried it again and it broke loose.

Now, I ask myself "how in the hell am I going to get it out? The steering shaft is in the direct line of the glow plug." Well, unscrew it and try to angle it as much as I can ... sure enough, barely cleared the steering shaft. I applied some anti-seize to the new one and was able to put it in. All done and it really wasn't that bad at all.

I'm so happy that I was able to do it myself without having to resort to taking it into the shop.

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Old 10-02-2015, 09:47 PM   #2 (permalink)
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I've also done a few myself and it's a good feeling. I took the steering shaft off which is just 1 or 2 more little bolts. Makes that glow plug much easier going in and out so there are no angles. Mine is an 07 classic so might be different.

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Old 10-03-2015, 09:45 AM   #3 (permalink)
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Loosening the steering shaft is the best way otherwise you run the risk of snapping the glow plug off. Just be sure when unhooking the steering shaft you tie it off with seatbelt to prevent the steering wheel from turning and thus breaking the SIR coil otherwise know as the clock spring which for the trucks with steering wheel controls just the spring runs about $300.00.

I recently gave up on PB blaster and purchased a Reusable Refillable Multipurpose Aerosol Spray Bottle and use a 50/50 mix of acetone and transmission fluid just have to be careful where you use it, lacquer thinner can be substituted.


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Old 10-24-2015, 10:10 PM   #4 (permalink)
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Looks like #5 has failed. My first @ 61k. Is it better to change glow plugs after warming engine up?
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Old 10-25-2015, 12:11 AM   #5 (permalink)
Ron Nielson
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Definitely, warm, not hot. And don't fail to use anti seize on the new plugs.
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Old 10-25-2015, 05:40 PM   #6 (permalink)
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50/50 mix of acetone and transmission fluid if what i've used for a while now to get glow plugs out, but if your not an experienced with chemicals or you forget things then use PB blaster. if you do try this mixture then only use enough don't sit there spraying it all over the place and when it breaks free use brake cleaner and wash it all OFF.

and this works really good on the uppipe to manifold bolts
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Old 10-25-2015, 10:45 PM   #7 (permalink)
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Yea, I've got to do #4 and #6. Thanks for the tips.
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Old 11-01-2015, 04:04 PM   #8 (permalink)
mebob
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let em soak, the longer it soaks the better the chance it will let go!
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2006 Chevy LBZ
3 inch MBRP downpipe with 4 inch exhaust.
Edge insite CS 85100, transgo jr shift kit, FASS 150, edge EGT sensor, Egr blocked off with blocker plate that can be removed when testing time comes
just bought truck 11/14 upgrades are coming as the cash gets in the bank account!
Working in a Gm dealership as diesel specialist , and no i don't half *** anything to make flat rate. its always done right and clean.
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Old 11-02-2015, 08:38 PM   #9 (permalink)
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After hearing several horror stories was able to change all 8 no problems in just under 2 hrs. #2 was hardest due to intercooler tube. With u joint and half deep well socket was no need for removing steering shaft or ic hot tube although some concern on not being inline perpendicular figured I couldn't put much torque with a short handle 1/4" drive ratchet. I changed cold figuring aluminum expands more than the steel making fit tighter. Sprayed pb let engine warm up. Sprayed again. Let cool over night to wick in. Removing wheel wells seems to take the most time although much better than in sub zero degrees and snow packed with gelled filter and the o ring gasket from hell. Now to find some frozen fasteners on something to try the acetone trans fluid on. Thx all.
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2006 LBZ CCSB -
Fass Titanium 95gpm w optional heater + (2) 100 watt wrap heaters.
HID 35W 5k low beams.
Wurton 5-inch 10W Cree LED flood w custom mounts (Junk/REPLACED w brighter generic @ $16/set)
Rancho RS9000s. 265 BF Goodrich Trail T/A
TKO Coil Overload Springs. 16k # Class V Receiver. TransGoJr Shift Kit. Transfer case rub kit.
LMC Rear wheel well liners
Edge CTS2 monitor
Kitten free Pro-Flow SS 4-inch Exhaust w muffler
EFI Live ECM and TCM Tuning
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Old 11-07-2015, 12:18 PM   #10 (permalink)
mebob
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Quote:
Originally Posted by 69GTO2 View Post
After hearing several horror stories was able to change all 8 no problems in just under 2 hrs. #2 was hardest due to intercooler tube. With u joint and half deep well socket was no need for removing steering shaft or ic hot tube although some concern on not being inline perpendicular figured I couldn't put much torque with a short handle 1/4" drive ratchet. I changed cold figuring aluminum expands more than the steel making fit tighter. Sprayed pb let engine warm up. Sprayed again. Let cool over night to wick in. Removing wheel wells seems to take the most time although much better than in sub zero degrees and snow packed with gelled filter and the o ring gasket from hell. Now to find some frozen fasteners on something to try the acetone trans fluid on. Thx all.
right on dude, i've also heard of guys getting the engine up to temp and spraying with pb blaster and then putting ice cubes or dry ice on the tip of the plug to make it contract and give room between treads to get the PB in there, no idea if it helps but the theory makes sence

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2006 Chevy LBZ
3 inch MBRP downpipe with 4 inch exhaust.
Edge insite CS 85100, transgo jr shift kit, FASS 150, edge EGT sensor, Egr blocked off with blocker plate that can be removed when testing time comes
just bought truck 11/14 upgrades are coming as the cash gets in the bank account!
Working in a Gm dealership as diesel specialist , and no i don't half *** anything to make flat rate. its always done right and clean.
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