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Head Bolt Torque |
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Tomski 
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Joined: October-19-2006 Location: United Kingdom Status: Offline Points: 227 |
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 Topic: Head Bolt TorquePosted: April-12-2007 at 5:20am |
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All the parts arrived to refit head yesterday and I got it all cleaned up last night. Want to make a start tonight.
I need to know the torque for the head bolts as I have two conflicting manuals. The engine is a mercruiser bluewater 5.7. Same goes for valve lash - one says tighten to remove lash then 3/4 of a turn the other says 1 complete turn - which is right? Thanks Tom |
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Waterdog
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Joined: April-27-2006 Location: United States Status: Offline Points: 2020 |
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Posted: April-12-2007 at 8:45am |
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Cast iron head 80 ft. lbs. torque in 3 progressive steps. I did 30,60 & 80 follow the torque sequence. rocker arms (hyd.lifters)spin the push rod with your fingers and tighten the nut until there is a heavy drag then 3/4 to 1 extra turn is OK just do them all the same.Make sure the valve is closed (lifter is on the base circle of the cam) I rotate the engine until the intake valve is closed then set the intake & exhaust of the same cylinder at the same time. Be sure the push rod is seated in the lifter correctly.
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