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Hi. Do you guys have the head bolt torque for a merc on OM651 diesel. Is it also the same knock-off engine in a sangyong actyon?

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6 Suggested Answers

  • 2 Answers

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Posted on Jan 02, 2017


SOURCE: Torque spec for flywheel bolt: Isuzu 2.5 diesel engine

normally 110 nueton metres. use nut lock and once you have torqued you will feel if you have to tighten it a bit more.

Posted on Aug 15, 2008

  • 1 Answer

SOURCE: Engine Bolt Torques- 2005 Chevy Impala/3400 Engine

Head Bolts
Step one 37 ft lbs then tignten 120 degrees more

Rocker arms
Step one 11 ft lbs then tighten 90 degresss more

Upper intake
89 inch lbs
Lower intake
132 inch lbs

Posted on Dec 02, 2008

  • 783 Answers

SOURCE: Head bolt torque specs needed for 96 tbird 3.8

Head bolts are torque to yeild so you MUST use new bolts.
Tighten cylinder head retaining bolts in numerical sequence in three steps as follows:

  1. 20 Nm (15 lb-ft).
  1. 40 Nm (30 lb-ft).
  1. 50 Nm (37 lb-ft)
Loosen retaining bolts one at a time two to three revolutions and retighten as follows:

Long bolts:
  • Tighten to 40-50 Nm (30-37 lb-ft).
  • Rotate an additional 175-185 degrees.
  • Go to next bolt in sequence.
Short Bolts:
  • Tighten to 20-30 Nm (15-22 lb-ft).
  • Rotate an additional 175-185 degrees.
  • Go to next bolt in sequence.
Here is a pic of the sequence

Posted on Mar 19, 2009

  • 5 Answers

SOURCE: Head bolt torque specs?

I really really really hope you turned the bolts an additional 90 degrees after torquing to 22 Ft-lbs. Otherwise, you may be taking that head off again.

Best of luck,


Posted on Mar 15, 2010

  • 3640 Answers

SOURCE: i need the engine torque specs for 99 chevy malibu

99 chevy malibu v6 3.1 engine, head bolt torque is-- 98 through 2001 is step1- 37 foot lbs, step 2- rotate an additional 90 degrees (1/4 turn). the rocker arm bolts are 168-in. lbs.

Posted on Sep 07, 2010

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