300D starting problem

1976-1985: 230T, 230E, 230TE, 230CE, 280E, 280TE, 280CE, 240D, 300D, 300CD, 300TD,

300D starting problem

Postby jess » Tue 18 Apr, 2017 7:51 pm

I am having an issue when starting my 1981 300d, i wait for glow light to go out turn key and just get a single "click" this might happen 3/4 times and then she fires up, but on other occasions she starts straight away.
Has anyone else experienced this? any help would be much appreciated.
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Re: 300D starting problem

Postby Tony From West Oz » Wed 19 Apr, 2017 1:05 am

This sounds like a starter motor solenoid issue.
Either it has dirty contacts or is jamming, preventing the contacts closing.
The repeated attempts indicate that sometimes it is not jamming, or sometimes it makes good contact.
Some people recommend using a hammer to tap the solenoid to free a jamming solenoid armature.
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'83 W123 300D 325000km (Josephine) - sold.
'84 W123 300D replaced good OM617 912 with OM617 952 and enjoyed having good acceleration for the first time since first driving a 300D in 2002 - became engine and trans donor for 300CD Turbodiesel conversion. Now parted out.
'86 W124 300D sold (Wife's old car - sold )
'85 W123 300CD, 275 000km (Fatmobile) rebuilt turbodiesel from previous Fatmobile transplanted into 280CE
'99 W202 C250 Turbodiesel (my darling Wife's car - Sold)
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Re: 300D starting problem

Postby jess » Wed 19 Apr, 2017 8:53 pm

Cheers Tony I appreciate your help.
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Re: 300D starting problem

Postby Bartman4800 » Thu 20 Apr, 2017 2:50 pm

Don't use a hammer, use the stem. Otherwise use a broomstick. You could dent the solenoid with a hammer, rendering it useless...

If you take the starter motor off, you can usually fix the solenoid by cleaning the inside (piston and bore) and putting a light lubricant on (my dad used molycote and that did not work on cold mornings)
Make sure the contacts are clean too.

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Re: 300D starting problem

Postby GrampiansMerc » Wed 26 Apr, 2017 12:59 pm

Getting the starter motor off is a bit tricky....

Several long extensions on the 1/2inch socket set, as well as a uni joint adapter will be useful (plus a 10mm allen key head for the 1/2inch socket)
1980 300TD "Anna" - 400,000kms and still cruising, converted to SVO
1979 300D - sold, gone to be restored
1980 300D - "Lightning" recently purchased and currently making repairs
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Re: 300D starting problem

Postby mathuisella » Sun 21 May, 2017 4:55 am

How did you go with this Jess ?

I had this problem recently and just replaced the starter motor itself, i still have the old starter motor here.

I am going to open it up and service the solenoid and more happy to take video and pictures.

but won't be able to do it until june 25th as i still have uni assignments and exams for the next 5 weeks.
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