w123 Diesel Intermitent start issue. - Mercedes-Benz Forum

 
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 10-09-2016, 09:46 PM Thread Starter
BenzWorld Senior Member
 
wroding's Avatar
 
Date registered: Mar 2014
Vehicle: 1968 280se, 1972 280se 4.5, Land Rover disco II, Triumph Thruxton, Triumph Tiger. +boring Chevy Van
Location: Grass Valley california
Posts: 431
Mentioned: 0 Post(s)
Quoted: 51 Post(s)
(Thread Starter)
w123 Diesel Intermitent start issue.

Hi All
I'm trying to help a friend with his 78 w123 diesel. Basically when he goes to start it, the glow plug light glows then turns off, but when you turn the key Nothing happens. No click or noise what so ever. The starter is brand new. My attention was turned to the gear shift lever on the floor. I was wondering if the car still thought it was in drive? I have had this problem before on my Mercedes. I moved the shifter back and forth then the car would start! So it seems that is the problem. My question is what should I look for? A safety switch? Or a loose bushing? (That's what it was on my car). I am not familiar with the w123 so if there is anything I should know first that would be of great help.
all the best John.
wroding is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old 10-10-2016, 07:41 AM
BenzWorld Elite
 
MBGraham's Avatar
 
Date registered: Oct 2006
Vehicle: '72 350SL, '85 300D, '98 E320, '14 GLK250
Location: Ont, Canada
Posts: 7,833
Mentioned: 1 Post(s)
Quoted: 8 Post(s)
Quote:
Originally Posted by wroding View Post
Hi All
I'm trying to help a friend with his 78 w123 diesel. Basically when he goes to start it, the glow plug light glows then turns off, but when you turn the key Nothing happens. No click or noise what so ever. The starter is brand new. My attention was turned to the gear shift lever on the floor. I was wondering if the car still thought it was in drive? I have had this problem before on my Mercedes. I moved the shifter back and forth then the car would start! So it seems that is the problem. My question is what should I look for? A safety switch? Or a loose bushing? (That's what it was on my car). I am not familiar with the w123 so if there is anything I should know first that would be of great help.
all the best John.
The W123 does have a neutral safety switch on transmission that is part of starting circuit. Then there is the ignition switch itself. Electrical part is at inner end of starting switch.

When I had a similar problem on my W123, I changed both of above and still no luck. Ended up being the starter itself. But you say car has a new starter and presumably solenoid as well? Did the starter work after it was initially installed? I would try powering the starter directly, with a hand switch to make sure it does work. Then work back.

Kent has a guide here: https://mercedessource.com/problems/...er-the-starter
and Diesel forum at Peachparts and W123 forum here are other great resources.

1972 350SL 4.5L - MBGraham, near Kingston, Ontario
MBGraham is offline  
post #3 of 3 (permalink) Old 10-10-2016, 09:51 AM Thread Starter
BenzWorld Senior Member
 
wroding's Avatar
 
Date registered: Mar 2014
Vehicle: 1968 280se, 1972 280se 4.5, Land Rover disco II, Triumph Thruxton, Triumph Tiger. +boring Chevy Van
Location: Grass Valley california
Posts: 431
Mentioned: 0 Post(s)
Quoted: 51 Post(s)
(Thread Starter)
Quote:
Originally Posted by MBGraham View Post
The W123 does have a neutral safety switch on transmission that is part of starting circuit. Then there is the ignition switch itself. Electrical part is at inner end of starting switch.

When I had a similar problem on my W123, I changed both of above and still no luck. Ended up being the starter itself. But you say car has a new starter and presumably solenoid as well? Did the starter work after it was initially installed? I would try powering the starter directly, with a hand switch to make sure it does work. Then work back.

Kent has a guide here: https://mercedessource.com/problems/...er-the-starter
and Diesel forum at Peachparts and W123 forum here are other great resources.
Thanks MB Graham. Good idea. when I get a chance I will try that. The main reason I think its the safety switch is that it fired as soon as I moved the shifter back and forth.
All the best John.
wroding is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > General Mercedes-Benz Forums > Vintage Mercedes-Benz

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











  • Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
     
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode



    Posting Rules  
    You may post new threads
    You may 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 Off
    Trackbacks are On
    Pingbacks are On
    Refbacks are On

     

    Title goes here

    close
    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome