Torque settings HW Single

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Mac01
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Torque settings HW Single

Post by Mac01 »

1949 AJS 350.

Are there any factory torque settings / values for the crank case stud nuts and the four cylinder head bolts, re a 1949 HW 350 single ? (cast iron head)


Thanks.


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SPRIDDLER
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Re: Torque settings HW Single

Post by SPRIDDLER »

I'm not aware of any documentation on torque values except as below in the Army Workshop manual. From the books and articles of ex-employees it seems that assembly workers specialised in a particular 'job' for many years using the same (length) spanners every day and judged the force needed by feel/experience.
There's an interesting practical article on stripping/reassembling singles engines by Ken Bryant (ex ITMA on these forums) which suggests 30 ft/lbs for the head bolts (and 10 ft/lbs for the rocker cover) which you may find useful. I've only recently used a torque wrench for head bolts and tightened them to 30 and never re-checked/re-tightened them. Don't forget to anneal (soften) the head gasket - even a new one. The article is here:
http://archives.jampot.dk/technical/Spe ... hanics.pdf

Here's the Army G3L workshop manual which has very comprehensive info on sizes, tolerances etc.
I've noticed that for the head bolts it says:
G3L head bolts torque (640x57).jpg
EDIT: and for the crankpin nuts:
G3L crankpin torque (640x44).jpg
It's in the Army manual here:
http://archives.jampot.dk/book/Workshop ... ndards.pdf
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Expat
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Re: Torque settings HW Single

Post by Expat »

I've only recently used a torque wrench for head bolts and tightened them to 30 and never re-checked/re-tightened them. Don't forget to anneal (soften) the head gasket - even a new one.

Well I didn't use a torque wrench but did anneal the new gasket. Didn't recheck tightness, no problems since. 2000+ miles. :D

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spookefoote1956
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Re: Torque settings HW Single

Post by spookefoote1956 »

I set my spanner to one grunt.
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Andy51
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Re: Torque settings HW Single

Post by Andy51 »

Head bolts are definitely 36 ft lbs; the figure of 15 ft lbs for the rocker bolts comes to mind but this needs confirming. Andy
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spookefoote1956
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Re: Torque settings HW Single

Post by spookefoote1956 »

I've got a figure somewhere in my 1957 workshop manual. Cylinder head bolts 35 ft lbs tightened diagonally (not the long one).
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Re: Torque settings HW Single

Post by Expat »

spookefoote1956 wrote:I set my spanner to one grunt.
:D
spookefoote1956 wrote:I've got a figure somewhere in my 1957 workshop manual. Cylinder head bolts 35 ft lbs tightened diagonally (not the long one).
Tried to tighten them diagonally but then found my arms are not long enough to reach them. Need a longer wrench. :roll:
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Mac01
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Re: Torque settings HW Single

Post by Mac01 »

Thank you all.
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clive
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Re: Torque settings HW Single

Post by clive »

My torque settings, medium spanner hard as I can for head bolts, small spanner on the rockerbox with a little less effort. :beer:
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Re: Torque settings HW Single

Post by Expat »

:rofl: :rofl: :rofl:
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