Cylinder base studs

splatt · Oct 13, 2011

On 850's are the cylinder base studs bsw/ unf or bsw/cei, the studs in the head are still bsw/cei are they?

marinatlas · Oct 13, 2011

Hi, the 850 cylinder base studs are BSW /UNF ,but the cylinder head studs are (like all 850,750) BSF /CEI....

L.A.B. · Oct 13, 2011

splatt said:
On 850's are the cylinder base studs bsw/ unf or bsw/cei, the studs in the head are still bsw/cei are they?

The '72-on base studs are UNC/UNF

Andover Norton - CYLINDER BASE STUD 3/8

CYLINDER BASE STUD 3/8

andover-norton.co.uk

splatt · Oct 13, 2011

Thanks guys, cases UNC/ unf, head retaining studs bsw/cei, so does that mean there are 2 nuts that appear identical but with different threads, center case and rear head nut?

L.A.B. · Oct 13, 2011

splatt said:
Thanks guys, cases UNC/ unf, head retaining studs bsw/cei, so does that mean there are 2 nuts that appear identical but with different threads, center case and rear head nut?

The rear head stud nut 067870 (the one between the carbs) is 3/8" 26 tpi cycle/or Whit form as the nut is Whit form according to AN (.525" hex).

Andover Norton - CYLINDER BASE/ HEAD NUT 3/8

CYLINDER BASE/ HEAD NUT 3/8

andover-norton.co.uk

Centre case (front base stud nut) 062651 is 3/8" UNF.

Cylinder base studs

splatt

marinatlas

L.A.B.

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