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 Post subject: need info fast
PostPosted: Tue Oct 18, 2011 3:04 pm 

Joined: Sun Apr 24, 2011 10:41 am
Posts: 42
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hi everyone,
I'm currently rebuilding my L20s (six cylinder) from my c31 laurel 1983-84 model
I really need the torque specs for the hex head bolts and the crank caps bolts
help is really appreciated :o
the head bolts are black and stamped with number 13 on top :?
I already torqued them in sequence 1) 20 ft.lb 2)40 ft.lb
but I feel like 40 ft.lb is too low since I had to use a steel bar to crack them loose the first time!!


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 Post subject: Re: need info fast
PostPosted: Tue Oct 18, 2011 3:17 pm 
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Joined: Wed May 27, 2009 1:27 am
Posts: 164
Location: Elbow deep in grease, in a garage somewhere in Sydney
I can remember my book for the 260Z quoted between 33 and 40 ft.lb for the main bearing caps and the conrod big-ends. I too thought it was a bit low but its what was printed in the factory service manual :?

That book will also have head bolt specs but its at home and I'm at work :lol:
I'm sure someone can remember them off top of their head.

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 Post subject: Re: need info fast
PostPosted: Wed Oct 19, 2011 8:08 pm 
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Joined: Sun Jun 22, 2008 11:08 pm
Posts: 97
Location: New Zealand
According to factory manual....

Head bolts:
Up to March 71 production 6.0 - 7.0kg-m (43 - 51ft-lb) straight bolt and washer
From April 71 production 7.0 - 8.5 (51 - 61) hex bolt

Main bearing cap:
4.5 - 5.5kg-m (33-40ft-lb)

Connecting rod cap nut:
M9 size bolt 4.5-5.5kg-m (30-40ft-lb)

M8 bolt 3.7-4.3 (27-31)


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