Author Topic: Exhaust Manifold Nut Torque Specifications on W40  (Read 355 times)

Ruvel

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Exhaust Manifold Nut Torque Specifications on W40
« on: October 30, 2020, 02:04:13 PM »
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.
S/V Ishtar
Ketch, Hull 308

Jordan

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Re: Exhaust Manifold Nut Torque Specifications on W40
« Reply #1 on: November 01, 2020, 05:56:46 PM »
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

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Re: Exhaust Manifold Nut Torque Specifications on W40
« Reply #2 on: November 02, 2020, 05:52:58 AM »
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.
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