Question: Can you read glow plugs like you can spark plugs? - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 01-08-2015, 07:29 PM   #1 (permalink)
callmebobvilla
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Can you read glow plugs like you can spark plugs?

Howdy,

Bought a 2000 GMC 3500 Dually CC 4WD with 122k miles. Diagnosed leaking injectors, ordered the PCM, Turbo-Master, Bosch Standard Injectors from Heath. In order to get the truck started in cold weather, replaced the driver side glow plugs tonight (god willing she will start and I can get her to a nice warm shop on Saturday to do the rest of the work). 3 of the 4 glow plugs tested at 500k + kiloOhms (bad), so I think I may stand a chance. That being said, I inspected the old glow plugs and have one (it tested bad) that is not like the others. Pics are posted... you can see a nice carbon buildup that is caked on. This would indicate to me, in a gasoline engine, that I have oil getting into the cylinder. Any thoughts? The rest weren't pretty, but any carbon wiped right off. This is definitely caked.

Thanks for your expertise guys!

Josh

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Last edited by callmebobvilla; 01-08-2015 at 07:29 PM.
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Old 01-08-2015, 07:57 PM   #2 (permalink)
Freddyack
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Welcome to the Forum!

I replaced my glow plugs recently. My old ones look like yours.

What brand/type did you replace them with?

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Old 01-08-2015, 08:09 PM   #3 (permalink)
callmebobvilla
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The replacements are AC Delco 60G's. The ones I pulled out were Autolite 1110's. The pics are of two old ones... the left in the pic is the only one that had significant carbon buildup on the "shoulder" portion... the rest were relatively clean. Could be the carbony one was just older than the rest I suppose.
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Old 01-08-2015, 08:13 PM   #4 (permalink)
Freddyack
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IMHO, some carbon build up is normal and nothing to worry about.

When you replace the rest of them put some anti seize on the threads and make sure they are torqued to 17 ft/lbs
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Old 01-08-2015, 08:14 PM   #5 (permalink)
sctrailrider
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Looks normal to me for 122K miles... after all you are burning a oil product for fuel...

new ones will be good...
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Old 01-08-2015, 08:15 PM   #6 (permalink)
Freddyack
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Also, go to the UserCP in the upper right corner of the Forum page. Click on Edit Signature and put some info about your truck there. It will show up each time you post.
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Old 01-08-2015, 09:10 PM   #7 (permalink)
callmebobvilla
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Quick update: Truck started with some hesitation at -5 F, so that's a good sign. Thanks guys for your input. I will update if it turns out there is a bad cylinder... seems like a reasonable check if buying a new truck. This one blows no smoke, but if it has a bad ring/valve, reading the plugs might be worth it if in the market.
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Have a 2010 Ford F350 6.4l diesel 6-speed manual, manual transfer, regular cab, black on black on black, on 37" Goodyear MT/R Humvee Tires with airbags, DPF delete, Spartan tune, true CSX train horns and 35k miles. Appx. 500 HP and 1000 ft.lb. of torque. Love the truck... she's terrible at towing and not great in the snow. But I love her nonetheless.
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Old 01-08-2015, 10:08 PM   #8 (permalink)
turbovanman
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You should be looking at the tip, not the spade end.
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Old 01-08-2015, 10:36 PM   #9 (permalink)
HeavyChevy95
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Yes, you can read glow plugs like sparkplugs..

See bottom of pg 6...
Bosch Technical and Sales Information- Diesel Glow Plugs 8pg PDF

Better yet..
See page 13 All About Glow Plugs 16pg PDF

Last edited by HeavyChevy95; 01-08-2015 at 10:39 PM.
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Old 01-09-2015, 02:54 PM   #10 (permalink)
JMJNet
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Chances are the injector return hoses are leaking.

That causes the crudz on the upper thread.

IMO, there are 2 GP for this truck, the Bosch Duraterm and ACDelco 60G.

Other brand including older ACDelco are not recommended.

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