I am currently working on a Benz Vito bus engine and cannot find the engine tightening torques. I have search all over the web for this information with no luck.

Thanks in advanced.

  • Welcome to Motor Vehicle Maintenance & Repair! An engine has many parts. Which torque specs are you looking for specifically?
    – user60481
    Nov 26 '20 at 10:00
  • Apologies, i am looking for cylinder head bolt tightening torque specs
    – Nic
    Nov 26 '20 at 10:51

According to this forum thread, the torque values for the OM651 engine head bolts are as follows:

  • 1st pass - 15Nm (11 lb-ft)
  • 2nd pass - 90°
  • 3rd pass - 90°

I'm assuming these bolts are most likely torque to yield bolts, you need to be using new bolts when you do this.


Had this issue many years ago for an old engine.

The mechanic and I took the bolts and worked out the max allowable loading then took 2/3 of that value.

We also looked at the threads and the material of the head and block then derated that calculated by another 10 or 15%.

The engine ran fine.

Do also consider the head gasket as part of the process - for us is was a copper gasket.

  • Will try, and let you know the results
    – Nic
    Nov 26 '20 at 12:10

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