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  #1  
Old 05-12-2012, 03:43 PM
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Glow plug question

Well, yesterday the 83 300D started starting hard, run rough and puff smoke. It would do this for a few seconds then smooth out and run great. Starting warm/hot it turned right over, but cold (even in ambient 70 degree weather) it turns over hard, runs rough and puffs smoke for a few seconds. Classic bad glow plug signs.

Today I metered the glow plugs out and numbers 1, 2, and 3 all read .4 ohms, Number 4 reads 586 ohms, and number 5 reads 750 ohms. So.....I'm assuming #4 and #5 glow plug are toast. Now the question(s)

First, which ones are #4 and #5? I'm assuming they are the back two plugs (closest to the firewall) and not the front two (which look to be the easiest to get to)

Second, what is the best way to R & R them? If the bad ones are the back two plugs they look to be a little bit of a bit#h to get to. I've replaced glow plugs on my TDI Jetta and it is not too rough, but these look like they have been in the engine for the last 20 years so I don't want to screw anything up.

Thanks for any help.

Glenn
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Old 05-12-2012, 03:46 PM
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Quote:
Originally Posted by psaboic View Post
First, which ones are #4 and #5? I'm assuming they are the back two plugs (closest to the firewall) and not the front two (which look to be the easiest to get to)
Good assumption.


Quote:
Originally Posted by psaboic View Post

Second, what is the best way to R & R them?
Ratcheting combination wrench.
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Old 05-12-2012, 04:10 PM
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I remove the Fuel Injection Hard Lines so I have more room. But, that means I need to bleed them of Air when I install them.
Others leave the lines on.

New Bosch Glow Plugs do not come with the little Nuts. People have said to stuff Rages down below where the Nuts might Fall.

If the Glow Plugs are removed it is a good idea to use a Glow Plug Reamer or some alternative method to clean the Carbon out of the Glow Plug Hole. Plenty of info on that in the DIY section.
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Old 05-12-2012, 04:37 PM
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glow plugs

I have replaced + reamed mine on my 85 300 SD without taking the FI lines off it is difficult but can be done while perched on top of the engine. Probably easier if you remove the lines but make sure you do not crossthread them on reinstallation which is what i was most worried about. It is a good idea to stuff a rag under the one you are working on so you do not lose the little nut.
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Old 05-12-2012, 07:57 PM
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To avoid cross threading screw them in by Hand before tightening.
A Neverseeze type compound on the Threads can help the come out easier the next time.

Only Bosch or Beru Glow Plugs hold up well.

I had an experience where the Tips of 2 Autolite Glow Plugs became swollen and I barely got them out of the Cylinder Head.
I replaced them with Monark Glow Plugs and some of those failed in 6 months.
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  #6  
Old 05-12-2012, 08:09 PM
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Had two Bosch replacement glow plugs, so after about 2 hours of playing around I had them swapped out. Car starts immediately after turning key now, no smoke and smooth idle. Looks like that issue is taken care of. Thanks for all the tips folks.

Glenn
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2017 Santa Fe 13K (hers)
2002 VW Jetta TDI 185K (mine)
1998 Volvo S70 T5 Turbo 115K (kids)
1992 Ford F150 4WD 257K (wood getter)
1983 Mercedes 300D 315K (diesel commuter)
1965 Corvair Corsa 98K (fun car)
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Old 05-12-2012, 10:11 PM
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Two hours? Sounds like you had a rough time. I can do all five in under an hour.
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Old 05-12-2012, 11:03 PM
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Naw, the only rough one was number five, but I got interrupted twice by the wife and son needing something, so it took a total of two hours. Actual work time was about 45-50 minutes .
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2017 Santa Fe 13K (hers)
2002 VW Jetta TDI 185K (mine)
1998 Volvo S70 T5 Turbo 115K (kids)
1992 Ford F150 4WD 257K (wood getter)
1983 Mercedes 300D 315K (diesel commuter)
1965 Corvair Corsa 98K (fun car)
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