SQ4 Mk1 Otto gasket instructions

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xavier.devars
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SQ4 Mk1 Otto gasket instructions

Postby xavier.devars » Thu Nov 05, 2020 8:50 am

Hello everyone,

The gasket set I got from Dragan is missing the torque instructions page. I can't find it in the club ressources and the one available in this forum is corrupted. Could someone share it with me, please ? The road to a running SQ4 is not an easy one...

Many thanks !

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Paul_Linden
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Re: SQ4 Mk1 Otto gasket instructions

Postby Paul_Linden » Thu Nov 05, 2020 10:40 am

Hello Xavier, I had the same problem getting that page last year! I’ve sent it to you as an attachment to a PM (look in your inbox in this forum).
Regards, Paul
Square 4 mk1, Square 4 mk2, Ariel Colt, Matchless G12, BSA C12.

xavier.devars
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Re: SQ4 Mk1 Otto gasket instructions

Postby xavier.devars » Thu Nov 05, 2020 10:48 am

Got it !!

Thank you so much Paul. And now the tedious task of cylinderhead fitting !

Regards

Xavier

xavier.devars
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Re: SQ4 Mk1 Otto gasket instructions

Postby xavier.devars » Fri Nov 06, 2020 6:13 pm

I can't believe how low those torque figures are ! I am looking forward to seeing how the seals hold with engine running.

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Paul_Linden
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Re: SQ4 Mk1 Otto gasket instructions

Postby Paul_Linden » Fri Nov 06, 2020 6:41 pm

Those figures are correct, as my Mk1 is running all right with them. A few weeks ago I did the third and final torque down. I’ve also done compression tests on the cylinders in both hot and cold states, which came out all right.
Square 4 mk1, Square 4 mk2, Ariel Colt, Matchless G12, BSA C12.

Gui.dorey
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Re: SQ4 Mk1 Otto gasket instructions

Postby Gui.dorey » Fri Nov 06, 2020 8:12 pm

Paul Linden,

when you do the torque down, do you torque again to the same value given by the instructions, or to a lower value?

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Paul_Linden
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Re: SQ4 Mk1 Otto gasket instructions

Postby Paul_Linden » Fri Nov 06, 2020 9:06 pm

Yes, I use the figures in the table at every torque down. Note that when torquing down, I first slacken the nut by a quarter turn to release any ‘tension’ then tighten it to the torque value.
For what it is worth, all my head studs and nuts are 303 stainless, with the higher torque figures.
Square 4 mk1, Square 4 mk2, Ariel Colt, Matchless G12, BSA C12.


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