BMW K bikes (Bricks)

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1Back to top Go down    Cylinder head reffiting - best practice on Wed May 18, 2016 7:23 am

pond snail

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Hello all,

K75 is slowly coming along, Getting ready to fit a replacement cylinder head, the manual states to torque to 30 Nm give or take 4, then to wait 20 minutes, then torque to 45Nm give or take 5.

Any advice on re torquing after, say wait for 24 hours then re torque to final figure, or after x amount of miles up the road?.

Previous experience with alloy car engines, Reliant in particular, I would re torque after 24 hours, never had an issue there.

So, just wondering what's best practice for the K, are they good to go after the second torque, or do they need re torquing again, just to be safe.

Thanks,

John

    

pond snail

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No reply?, never mind, engine now bolted back to frame.

I did re torque, 45Nm, after 24 hours, torque wrench clicked right away, no movement.

Now waiting on one new shim, then the camshafts and timing parts can go back on, getting there slowly, very satisfying to see engine/gearbox back in frame Smile.

Can you say a K engine goes back in the frame!, perhaps reunited with frame is more apt?.....

John

    

Inge K.

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About retorquing headbolts....that isn't neceserry when stretch bolts is used, but they also is one time use.

The recommendation from BMW about headbolt tightning:
1. 22 Nm / 16 ft/lb.
2. 64 degrees.
3. Another 42 degrees.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

pond snail

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Hello Inge K,

Thanks for the reply, you are quite right about the stretch bolts being a one time use, but my engine does not use them, I have had a look at both my Haynes and Clymer manuals, also the BMW factory manual I downloaded, none mention stretch bolts or tightening by degrees, only the two torque figures given, so I am guessing they are used on later models/engines?.

Got the transmission back on today, getting there....

Thanks,

John



Last edited by pond snail on Sat May 21, 2016 8:19 pm; edited 1 time in total (Reason for editing : Re worded for clarity)

    

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