Exhaust Manifold Nut Torque Specifications on W40

[Ruvel]

Hi Everyone,

I've been searching for the torque specifications for the 4 nuts that attach the exhaust manifold to the cylinder head on the Westerbeke 40, but haven't had any luck. I did find the specs for the W58 which states 20-24 ft. lbs.. I would assume that the W40 would be less, something like 18 ft. lbs.. Does anyone here know the correct torque specifications for them?

Thanks.

[Jordan]

Westerbeke 40s are either Perkins 4.108 or Perkins 4.107. This might help
https://www.manualslib.com/manual/843561/Perkins-400-Series.html?page=16

[SVJourney]

I would check those before using them.  For instance, the exhaust bolt values are for bolts, not nuts.  They list as M10, which is 10mm and the 4-107 uses standard sizes. 
I don't bother to try and torque the exhaust.  Use new gaskets and snuggle them down with a wrench.