1st post--Glow plug installation question

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Mar 10, 2009 | 06:36 PM

#16

e.alleg

Freshman User

Joined: Feb 2009

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Great info on this site. I've been thinking about swapping out the glow plugs myself. Out of curiosity how long do the glow plugs normally last? Like should they be changed like spark plugs every 50k miles or so? Do the gaskets and harnesses need to be replaced at the same time?

Mar 10, 2009 | 06:49 PM

#17

rebelchevy02

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Joined: May 2006

Posts: 2,274

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From: Milroy, PA

My truck turned 200,000 miles last night. Still has the oem glow plugs, and started all winter with our pennsylvania winter. The first thing to start with is the glow plug relay, for sure.

Mar 10, 2009 | 06:51 PM

#18

mybigredford

Laughing Gas

Joined: Jan 2004

Posts: 807

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From: Prince George, BC

Quote:

Originally Posted by rebelchevy02

If you have some patience, some mechanical knowledge, and a little time, the glow plugs arent a terrible thing to replace. You remove both CAC tubes, (which all 4 boots should be cleaned well) and then the valve covers, and your in. Unhook the wires, remove the plugs. Crank the engine over my hand a few revs, then install new, and reverse the process. But I would most certainly start with the stancor GPR from the link to Guzzles site.

why do you have to crank the engine over a few times?

Mar 10, 2009 | 06:56 PM

#19

PaysonPSD

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Joined: Nov 2007

Posts: 9,549

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From: Payson, AZ

Quote:

Originally Posted by e.alleg

At 98k I had one bad GP. I am sure some still have 8 good GPs at 200k. Best thing to do is ohm them out. I changed all 8 and have 7 good spares. I wanted to remove the VCs anyway to re-torque injector hold downs and rocker bolts as well as install UVCH retainers so changed the GPs while in there. VC gaskets are reusable and so are the harnesses if the pins are not burnt or other wise damaged.

Edit: A little slow as usual.

Mar 10, 2009 | 06:59 PM

#20

rebelchevy02

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Joined: May 2006

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From: Milroy, PA

Quote:

Originally Posted by mybigredford

why do you have to crank the engine over a few times?

When you replace the glow plugs, theres a good chance some of the residual oil will go into the cylinder. So to remedy that, I hand cranked it over some. You may not have to, but I was happy with the extra insurance. Then I reinstalled the new plugs.

Mar 10, 2009 | 07:00 PM

#21

PaysonPSD

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Joined: Nov 2007

Posts: 9,549

Likes: 14

From: Payson, AZ

Quote:

Originally Posted by mybigredford

why do you have to crank the engine over a few times?

Oil with flow into the cylinder through the glow plug hole. You need to get the oil out of the cylinder so it will not hydro lock. I vacummed the oil out of each cylinder through the GP hole.

Edit: I'm Still slow

Apr 11, 2009 | 07:45 PM

#22

hgoody77

Senior User

Joined: Mar 2009

Posts: 124

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From: Bartlett, Tn (Memphis)

were do you ohm out the glow plugs to test those? seems like my relay is working. power in power out.

Apr 11, 2009 | 08:13 PM

#23

danskool

Go Bills !

Joined: Jan 2008

Posts: 2,778

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From: Buffalo, NY

At the top of each valve cover you will find a plug.

The connector that goes under the valve cover.

The wires are as follows.

GlowPlug,glowplug.injector.injector.common.injecto r.injector.glowplug.glowplug