Vehicle & Technical > Defender

Messed it up

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trickydicky:
thanks lez

marky:
I'm just about to refit my cylinder head after a skim, due to it being warped. The bloke who I borrowed the valve spring compressor off, said maybe I should tighten the bolts a little more than the manual says. He suggested that instead of 40Nm and 2x 60 degrees, go 2x 90 degrees? Can the bolts be over tightened? How would you check the torque after say 300 miles, as the final tightening is in degrees?

Les Henson:
I wouldn't do that - you are over-tightening the bolts by almost a 1/3 (I think). If a bolt snaps off below the deck surface you will have to possibly remove the engine to effect a repair. As long as the head is flat, the deck is flat, the gasket is good quality (Payen, Elring, FAG), then you should have no problems using the correct torque/angle figures.


Les.

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