Crank pinion torque setting 1974 w/c 250 scr

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steveroyall
Cucciolo - the Lil Pup
Posts: 3
Joined: Sun May 25, 2014 1:48 am
Location: Ashtead, Surrey UK

Crank pinion torque setting 1974 w/c 250 scr

Post by steveroyall »

Hi Chaps
Making good progress on my restoration of a 250scr 1974, spending loads of time in the shed.

I need to nip up the main crankshaft pinion nut but am not sure of the torque setting. I'm loath to just 'have a guess'.
One of you nice gentlemen/ladies will surely have a ball-park figure I should go for.

Thanks in advance
Steve
Surrey UK
steveroyall
Cucciolo - the Lil Pup
Posts: 3
Joined: Sun May 25, 2014 1:48 am
Location: Ashtead, Surrey UK

Re: Crank pinion torque setting 1974 w/c 250 scr

Post by steveroyall »

In the end I went for 'bloody tight', hopefully that will do.
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Craig in France
Paso 906
Posts: 972
Joined: Tue Mar 23, 2004 3:58 pm
Location: Montpellier, France

Re: Crank pinion torque setting 1974 w/c 250 scr

Post by Craig in France »

Sorry Steve - missed this one :oops: .

Yep, it's a Jesus Nut. And to prove the point :) , the figure given on page 81 of the Ducrappi w/shop manual is:

8.3 to 9.7 Kgm
That's 80Nm - 96Nm, to you and me 8) . So, 'Tight and then some'.

Note: This is the manual for the n/cases. However, the supplement that purportedly covers the wide-cases says:
"As a whole, follow the description of the (narrow-case) Work Shop Manual from page 78 to 93".

And specifically for this operation: "Follow as explained at page 81, figures 77 and 33 of the Work Shop Manual ...."
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