Johnson Stinger 75 head torque settings?

Ricky_rich

Petty Officer 2nd Class
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Mar 4, 2014
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114
I’m about to put the head back on to my Stinger from 1978. Does someone here know the torque setting, and the sequence to go around? And should it be done in several steps?
 

ob

Admiral
Joined
Aug 16, 2002
Messages
6,992
18 -20 ft. lbs.

sequence


10 9
6 5
2 1
4 3
8 7


And yea, I'd make a few rounds before calling it good.
 
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racerone

Supreme Mariner
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Dec 28, 2013
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36,048
The cylinder head was likely warped when taken off.----Have you resurfaced it ?-----Torgue for 5/16" bolts is 180 inch-lbs.---3 steps starting in center and working out.
 

Ricky_rich

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Mar 4, 2014
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114
No I have not had the head resufaced. Shoul it be done in a shop with a professional grinding machine? Or is it something I can do myself?
18 - 20 ft lbs is not much?
 

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Joe Reeves

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Feb 24, 2002
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No I have not had the head resurfaced. Should it be done in a shop with a professional grinding machine? Or is it something I can do myself?
18 - 20 ft lbs is not much?

Ricky.... 18 to 20 foot pounds is a bunch and it is "On Target!"

On a flat surface, you can initially use a sheet of 320 wet/dry sandpaper... wet it down with mineral spirits, then run the cylinder head over it a few times in a figure 8 pattern. That'll show up any high/low areas. Finish up with a sheet of wet/dry 400 w/mineral spirits.

If you have a flat edge tool (metal carpenters square), you can check for wear, warps, etc by laying the edge on the head in various areas. Any light showing through would indicate a imperfection.

Machine shop work is risky but also perfect.... the risk is taking off too much, increasing the compression to a point that may result in pre-detonation which would melt a piston.
 

racerone

Supreme Mariner
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Dec 28, 2013
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I think 20 ft-lbs is more than enuff for a 5 /16 bolt in aluminum.
 

Ricky_rich

Petty Officer 2nd Class
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Mar 4, 2014
Messages
114
Thanks for your advice. I have bought the stuff suggested and will do the job as soon as I can. I’ll post a pic when it’s done.
 
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