Pagoda SL Group

W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: declanobrien on April 01, 2010, 20:11:18

Title: Head bolts
Post by: 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? 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

Title: Re: Head bolts
Post by: drmb on April 01, 2010, 20:59:59

Mahle Germany now make 87.97 pistons as a special repair size 3

Title: Re: Head bolts
Post by: RickM 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...

(http://i609.photobucket.com/albums/tt180/RickMNJ/Torque.jpg)

Title: Re: Head bolts
Post by: declanobrien 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

Title: Re: Head bolts
Post by: RickM on April 02, 2010, 21:23:15

Have the bolts been upgraded to the recommended 12K (Marked 12L on the head)?

Title: Re: Head bolts
Post by: declanobrien on April 04, 2010, 12:06:30

Checked the bolts, and they are 12's.
Thanks
Declan