[Healeys] Connecting Rod Torque Settings? - BN1

[Chris Masucci]

Alan,

The correct torque for all main and rod caps for any engine, is whatever
torque is within the specified range and yields the same bearing clearance
on all caps.  It may take several attempts to arrive at a consistent
clearance.  Plastigage is cheap.

So if the range is 45-55 ft-lbs, then one should use whatever value in that
range results in consistent bearing clearance.  One cap may require 55
ft-lbs to yield a .0025 clearance, and another may require only 48 ft-lbs to
yield a .0025 clearance...for example.  

Cheers,
Chris
BJ8


-----Original Message-----
From: healeys-bounces+chris.masucci=alumni.rutgers.edu at autox.team.net
[mailto:healeys-bounces+chris.masucci=alumni.rutgers.edu at autox.team.net] On
Behalf Of Alan Seigrist
Sent: Friday, February 22, 2008 7:12 AM
To: John Harper
Cc: Healey
Subject: Re: [Healeys] Connecting Rod Torque Settings? - BN1

John -

Yes it's for the old girl, the Atlantic.

All of the big end (connecting rod) bolts have been replaced with the longer
bolts and the castellated nuts and drilled bolts are long gone (replaced by
some PO in Wellington, NZ ages ago).

I've bought all new Nyloc nuts so was just bolting it all up.  I checked
around and someone on BCF said it's the same as for the 6 cyl - 50 ft-lbs.
It makes sense to me, unless you have some other notion.

Best,

Alan

On Fri, Feb 22, 2008 at 9:06 PM, John Harper <ah at jharper.demon.co.uk> wrote:

>
> Alan
>
> Are you talking about the big or small ends?
>
> If the big ends, then unless you have the later Nyloc nuts you have to 
> work backwards and forwards to get the split pin through the 
> castellations. Only the later BN1 and BN2s had longer bolts and Nyloc 
> nuts. If you were perhaps thinking of your Atlantic then this had 
> finished production before the change to Nyloc came in.
>
> Regards
>
> >Sorry, I can't seem to find this data anywhere.
> >
> >Are the torque settings for the connecting rods in the BN1/BN2 bolted 
> >to
> a
> >50 ft-lb torue like the 6-cyl?
> >
> >It would be great if someone could confirm this.
> >
> >Thanks!
> >
> >Alan
> >
> >'52 A90
> >'53 BN1
> >'64 BJ8
>
> --
> John Harper
>



--
Alan

'52 A90
'53 BN1
'64 BJ8
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