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**hatzie** · 01-25-2021, 06:18 PM

If you look in the manuals thread you'll find the 6.2L bible. It's the GM technician training textbook for the 6.2L diesel engine.

DO NOT just apply power to the glow plugs. If they are the earlier 9G or 11G plugs they will swell up making them difficult to remove and sometimes they split apart dropping pieces of the abrasive hard ceramic element into the cylinder while the engine is running.
If you still have the original glow plugs get rid of them and install decent glow plugs that don't swell and break apart.
Positive Temperature Coefficient glow plugs... AC Delco 60G or Bosch dual coil glow plugs can be operated for 8 hours without burning out and swelling.

You can replace the early glow controllers with the 1985-2001 6.xL glow controllers. The wiring diagram in the 1989 RV series wiring manual should let you set one of these controllers up.

01-25-2021, 06:18 PM	#5
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 5,020	Re: Looking for 6.2 diesel nerds If you look in the manuals thread you'll find the 6.2L bible. It's the GM technician training textbook for the 6.2L diesel engine. DO NOT just apply power to the glow plugs. If they are the earlier 9G or 11G plugs they will swell up making them difficult to remove and sometimes they split apart dropping pieces of the abrasive hard ceramic element into the cylinder while the engine is running. If you still have the original glow plugs get rid of them and install decent glow plugs that don't swell and break apart. Positive Temperature Coefficient glow plugs... AC Delco 60G or Bosch dual coil glow plugs can be operated for 8 hours without burning out and swelling. You can replace the early glow controllers with the 1985-2001 6.xL glow controllers. The wiring diagram in the 1989 RV series wiring manual should let you set one of these controllers up. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.