Author Topic: 280SL head bolt thread size  (Read 1355 times)

wray

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280SL head bolt thread size
« on: March 06, 2018, 01:45:13 »
I'd like to clean and chase the block threads before installing the head. I'm told to get all oil out of the block threads , clean the head bolts and then use a light coating of oil to install. Then torque to specs. But I can not find the bolt thread size/pitch. Anyone know?
The machine shop determined that 2 of the guides fell out when the springs were removed. I have ordered oversized guides. I'm hoping this will solve the problem of blue smoke following idle then acceleration. Thanks

707dieseldean

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  • USA, CA, Santa Rosa
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Re: 280SL head bolt thread size
« Reply #1 on: March 06, 2018, 04:10:50 »
You will need an M12 X 1.75 bottoming tap to chase the head bolts in the block.

Good Luck and have Fun,
69 280SL / Manual 4 speed
 904 - Lower Midnight Blue
 158 - Upper White/Grey
 145- Vellum Interior