Question about Yamaha 40N/50N 40 and 50 HP Outboard Motor Service/Shop/Repair

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Torque for head bolts on yamaha 60hp head? - Yamaha 40N/50N 40 and 50 HP Outboard Motor Service/Shop/Repair

Posted by M Ben Evans on

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Fabrice Wolters

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  • 331 Answers

2 or 4 stroke?

Posted on Dec 26, 2017

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5 Related Answers

Anonymous

  • 4 Answers

SOURCE: head bolts torque settings

According to my haynes manual for G-S reg, 1989-1998 it goes as follows,
Stage 1:- Tighten all bolts by hand until bolt heads just contact cyl. head.
Stage 2:-Tighten all bolts to 40Nm or 30lb ft.
Stage 3:-Angle tighten all bolts a further 60 degrees.
Stage 4:-Angle tighten all bolts again a further 60 degrees.
Stage 5:- M12 x 140mm bolts ONLY angle tighten a further 20 degrees.
Hope this helps everyone, sorry it seems longwinded but that is how it's written in the manual.

Posted on Feb 07, 2009

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chuck943

Chuck Martin

  • 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
http://i253.photobucket.com/albums/hh43/chuck943/Headboltsequence38L.gif

Posted on Mar 19, 2009

Anonymous

  • 1 Answer

SOURCE: head bolt torque for a 1996 ford ranger 2.3liter

it is in the haynes repair manuel and chad is right

Posted on Apr 05, 2009

Anonymous

  • 1392 Answers

SOURCE: head bolt torque spec

Always use new head bolts.
1)tighten to 40ft/lbs
2)back off 1/2 turn
3)tighten back to 40ft/lbs
4)tighten an additional 90 degrees
5)tighten an additional 90 degrees.

Posted on Aug 16, 2009

Anonymous

  • 12 Answers

SOURCE: head bolt torque specs for 200 honda accord 3.0

its a three step process 1st 29ft/lbs 2nd 51ft/lbs 3rd 72.3ft/lbs

Posted on Apr 25, 2010

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