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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.

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  • 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
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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.

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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.

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

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