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Author Topic: Head bolts  (Read 3991 times)

declanobrien

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Head bolts
« on: April 01, 2010, 20:11:18 »
Reading the service manual for my 280 SL 1970, it notes "replace the 10k bolts with 12k". Can anybody explain what this means? Also, the bores are at the max at 87.5mm, meaning the engine has already been worked on. If I find that they are worn,can I sleeve the 280SL bores, and reuse my 87.47 pistons?
Thanks for any help.
Declan
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drmb

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  • New Zealand, Waikato, Te Awamutu
  • Posts: 125
Re: Head bolts
« Reply #1 on: April 01, 2010, 20:59:59 »
Mahle Germany now make 87.97 pistons as a special repair size 3
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Mercedes Restorer.
1969 280sl 050 whte Blue interior
1996 E320 Cabrio
1963 220se 111-023 cabrio, red,black interior.
1967 Morris Cooper
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RickM

  • Guest
Re: Head bolts
« Reply #2 on: April 01, 2010, 21:15:02 »
Quote from: declanobrien on April 01, 2010, 20:11:18
Reading the service manual for my 280 SL 1970, it notes "replace the 10k bolts with 12k". Can anybody explain what this means?
Thanks for any help.
Declan

Hi Declan:

This should explain sufficiently...



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declanobrien

  • Guest
Re: Head bolts
« Reply #3 on: April 02, 2010, 18:42:06 »
Many thanks. Very helpful to know that further oversize pistons are available. As regards the bolts, as I do not know how many times they have been reused, would it be safer to replace when I rebuild the engine?
Thanks
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RickM

  • Guest
Re: Head bolts
« Reply #4 on: April 02, 2010, 21:23:15 »
Have the bolts been upgraded to the recommended 12K (Marked 12L on the head)?
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declanobrien

  • Guest
Re: Head bolts
« Reply #5 on: April 04, 2010, 12:06:30 »
Checked the bolts, and they are 12's.
Thanks
Declan
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