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Author Topic: PETTERS UNIVERSAL "M" TYPE OIL ENGINE  (Read 296 times)

magneto man

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PETTERS UNIVERSAL "M" TYPE OIL ENGINE
« on: June 10, 2020, 03:10:18 AM »
Does anyone have torque figures for the 4 brass head nuts on the Petters Appletop engine. these sit in the cooling water and hold the tank to the body.

Also, does anyone know where one may aquire a cast iron exhaust part as shown on the attached photo. the large black portion!

Thank you

MM 

mike90045

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Re: PETTERS UNIVERSAL "M" TYPE OIL ENGINE
« Reply #1 on: June 10, 2020, 04:56:08 AM »
Brass nuts would have very light torque as brass is quite soft/weak. So be careful, and go easy on them, hardly more than finger tight, IMHO.

magneto man

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Re: PETTERS UNIVERSAL "M" TYPE OIL ENGINE
« Reply #2 on: June 10, 2020, 05:10:05 AM »
Thank you for the reply. I thought this was the answer, but how to compress the head gasket and get sufficient load on the head bolts? I am considering getting some stainless nuts so that some sufficient torque can be applied.

Thanks again

MM

mike90045

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Re: PETTERS UNIVERSAL "M" TYPE OIL ENGINE
« Reply #3 on: June 10, 2020, 06:50:00 AM »
Are you sure those nuts are the stud nuts ?   It seems very unusual for a high stress application, to use brass.

Is it possible they are only for the water jacket, and the head studs & nuts are buried someplace else ?