Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-11-2010, 01:30 AM
Registered User
 
Join Date: Jul 2007
Location: Upstate South Carolina
Posts: 1,103
78 300d loop style glow plugs

Got a quick question. This car has the plugs in series and the power from the glow plug relay hooks to the #5 cylinder and then on to #1. The #4 plug keeps burning in half. Can't figure out why.
Any similar problems or suggestions?
Thanks.
Reply With Quote
  #2  
Old 01-11-2010, 02:05 AM
Biodiesel300TD's Avatar
|3iodiesel300T|)
 
Join Date: Dec 2004
Location: Albany, OR
Posts: 4,845
I'd check the connections to the #4 plug and the #3 plug and make sure the ground on the end is good. You could also do away with the series plugs and put in the pencil style parallel plugs, put in a wires to each one, and remove the ground, and you'll have a parallel style system with pencil plugs. They make pencil plugs that fit. I did it to my 240 a while back and haven't looked back.
__________________
Andrew
'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
Reply With Quote
  #3  
Old 01-11-2010, 09:41 AM
Registered User
 
Join Date: Jan 2002
Posts: 18,355
X2. Switch to the retrofit pencil plugs. Better plugs, quicker starts. Threads on here give the part number for the plug. No need to switch out the relay.
I have no idea why one plug would keep burning out unless it was getting excessive voltage which might happen if the power was bypassing plugs 3,2 and 1 and going directly to ground.
__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
Reply With Quote
  #4  
Old 01-11-2010, 11:33 AM
Registered User
 
Join Date: Jul 2007
Location: Upstate South Carolina
Posts: 1,103
Ok, thanks. I had removed the toaster style loops loop from and to each plug, cleaned for good connection, cleaned the ground etc, had the system working great and then the #4 plug melted. Scratched the interior of precombustion chamber and blew out with air, replaced the plug again and it lasted 1 day.
The suggestion of installing the pencil style plugs; I've read about them, but how can you not replace the relay when switching to them?
See actually I'm working on a neighbors car, got the inop glow system working and then the issue with the #4 plug started.
I appreciate all the good advice.
Reply With Quote
  #5  
Old 01-11-2010, 12:02 PM
Registered User
 
Join Date: Jul 2007
Location: Upstate South Carolina
Posts: 1,103
Read the old thread. Talk was there was a kit to convert. I haven't located that kit. Some say that the relay (old type under steering column) doesn't require replacement.
Need some input.
Thanks.
Reply With Quote
  #6  
Old 01-11-2010, 12:02 PM
Stevo's Avatar
Registered User
 
Join Date: Apr 2002
Location: NW WA
Posts: 6,286
X3 on switching to the new style plugs, you wont regret it for a second. You can use your same relay just cut the glow time way down. You should go to a 80 amp fuse also.
__________________

1985 Euro 300TD 5 spd 220K
1985 Euro 240D 5 spd 130K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
Reply With Quote
  #7  
Old 01-11-2010, 12:07 PM
Registered User
 
Join Date: Jul 2007
Location: Upstate South Carolina
Posts: 1,103
Steve; sent you a pm.

Where can I get the pencil style glow plugs with the large thread to fit the head?
Reply With Quote
  #8  
Old 01-11-2010, 12:33 PM
Registered User
 
Join Date: Jul 2007
Location: USA
Posts: 2,156
i have a complete set of loop style glow plugs never used brand new
__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)
Reply With Quote
  #9  
Old 01-11-2010, 12:38 PM
Registered User
 
Join Date: Jul 2007
Location: Upstate South Carolina
Posts: 1,103
Thanks for the offer of loop plugs, but I refuse to install anymore because #4 will melt.
Thanks.
Reply With Quote
  #10  
Old 01-11-2010, 01:12 PM
Registered User
 
Join Date: Jan 2002
Posts: 18,355
Search for retrofit glowplug part number here and then order them from Fastlane. You'll have to make jumper wires to go from plug to plug and then connect the plug nearest the firewall to the original hot wire from the fuse box on the firewall. Delete the original ground wire at the front of the block. Old relay in 123 chassis will work fine.
__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
Reply With Quote
  #11  
Old 01-11-2010, 01:16 PM
Biodiesel300TD's Avatar
|3iodiesel300T|)
 
Join Date: Dec 2004
Location: Albany, OR
Posts: 4,845
Quote:
Originally Posted by kerry View Post
Search for retrofit glowplug part number here and then order them from Fastlane. You'll have to make jumper wires to go from plug to plug and then connect the plug nearest the firewall to the original hot wire from the fuse box on the firewall. Delete the original ground wire at the front of the block. Old relay in 123 chassis will work fine.
kerry states it well. I did this on my 240 without changing the relay. You can change the relay but it's not necessary.
__________________
Andrew
'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
Reply With Quote
  #12  
Old 01-11-2010, 01:50 PM
Stevo's Avatar
Registered User
 
Join Date: Apr 2002
Location: NW WA
Posts: 6,286
Quote:
Originally Posted by ridgerunner View Post
Steve; sent you a pm.

Where can I get the pencil style glow plugs with the large thread to fit the head?
Get them right here, price is good and they support this forum, click on "parts" at the top of the page.
__________________

1985 Euro 300TD 5 spd 220K
1985 Euro 240D 5 spd 130K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
Reply With Quote
  #13  
Old 01-11-2010, 01:55 PM
whunter's Avatar
Moderator
 
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,354
KIT for converting LOOP series GP to hotter pencil parallel system

F1101-88322 KIT for converting LOOP series GP to hotter pencil parallel system
F1101-88322 KIT for converting LOOP series GP to hotter pencil parallel system
Reply With Quote
  #14  
Old 01-11-2010, 09:04 PM
Palangi's Avatar
L' Résistance
 
Join Date: Dec 2000
Location: Republique de Banana
Posts: 3,496
A bad injector on that cylinder can burn out glow plugs like that.
__________________
Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE
Reply With Quote
  #15  
Old 01-12-2010, 01:08 AM
Registered User
 
Join Date: Jul 2007
Location: Upstate South Carolina
Posts: 1,103
Hey thanks to all for the info. Hunter sent me a link for the plugs and the kit. Looks like this is the direction I'll go.
Ya all keep up the good job.
Thanks.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 07:14 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page