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Starter bolt torque?
For some reason, I have been having problems with the starter bolts backing out. (Nearly left me stranded in the parking lot after the last GTG.) It usually occurs about once every six months. I have used some blue threadlocker and retorqued them.
The Haynes manual lists 18 ft/lbs. Isn't that a little low? Can someone with the CD verify this is correct?
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Sam 84 300SD 350K+ miles ( Blue Belle ) |
#2
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I don't use a torque wrench in such applications, but 18 sounds WAAaay low on those bolts. They're pretty hefty, just cinch 'em down good and forget it.
Good luck, |
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" (Nearly left me stranded in the parking lot after the last GTG.)"
Now that would be awful timing for that to happen.... My starter on my 240 was developing internal shorting problems due to the small bolts which hold the main brush cage in place... When I went to change the starter one of the bolts was not even finger tight... As long as the starters usually last a drop of red locktite is wonderful insurance. I quit using blue a long time ago.. and on a normal size bolt the red only adds 5 ft lbs to the torque necessary to break it loose ... but will keep it from backing off by itself... |
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Especially since I parked in a different parking lot than everyone else and they were gone by the time I got to my car. A loose starter makes an awful screech.
Well, I did the best I could to torque them to 45 ft/lbs. We will see if that lasts a little longer.
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Sam 84 300SD 350K+ miles ( Blue Belle ) |
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torque
Quote:
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Quote:
Dave
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1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car |
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Quote:
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I believe those are 10mm screws (the other trans to engine are 12mm) and I also have 55Nm for those screws. The trans manuals I have from Mitchell and ATSG both have it.
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'82 300SD - 361K mi - "Blue" "Good judgement comes from experience. Experience comes from bad judgement." listen, look, .........and duck. |
#9
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I wanted to respond to this in case someone does a search. The problem is the starter front support bracket was entirely missing on my car due to a previous owner/mechanic shortcut. As heavy as that starter is, no wonder they were always backing out.
Went to the dealer and ordered another, about $30. BTW, thanks guys for the torque info.
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Sam 84 300SD 350K+ miles ( Blue Belle ) |
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Quote:
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'82 300SD - 361K mi - "Blue" "Good judgement comes from experience. Experience comes from bad judgement." listen, look, .........and duck. |
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I am missing the lower starter bolt on my 300SD - would like to get one reasonably if anyone has some lying around.
On the one car that has had a rebuilt starter, I used Threadlocker Red. I am under the impression that TL Red requires heating with a torch (briefly) before it will release. And I did find that to be the case when I had to get the same start off for some reason I forget now. But once heated with a torch they came out easily. So for my part I would recommend Threadlocker Red on those big starter bolts - they wont' come out and when it IS time for them to come out again (10-20 years down the road?) the threads will have no corrosion. Ken300D
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-------------------------- 1982 300D at 351K miles 1984 300SD at 217K miles 1987 300D at 370K miles |
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To correct my previous post - those bolts are M12 x 85mm long. Torque is 65Nm. Loctite blue is more than sufficient. I don't use any loctite and it does not loosen at all. IMHO, Red loctite there is asking for trouble. Strip that M10 allen when you try to remove it and you'll be in a world of hurt.
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'82 300SD - 361K mi - "Blue" "Good judgement comes from experience. Experience comes from bad judgement." listen, look, .........and duck. |
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