1999 Yamaha 2 Stroke, OX66 225HP, 3.1L V6 Cylinder Head Torque Question.

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ibuyre111

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This engine has cylinder cover bolts (short bolts 6)that also secure to the head and then whole head is secured to the block by larger longer bolts.
Book states ..short bolts 2.9 ft. lbs. then 5.8 ft. lbs. Longer bolts 11 ft. lbs. then 22 ft. lbs...
Cylinder cover states(embossed) M6 0.8 KGM and M8 2.8 KGM..
Im looking find out how to convert metric to standard and compare.
If you have info on this torquing the cylinder heads it would be appreciated.
 
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Inducted

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Re: 1999 Yamaha 2 Stroke, OX66 225HP, 3.1L V6 Cylinder Head Torque Question.

m6 1st-2.9 ft/lbs......2nd-5.8 ft/lbs .............. m8 1st-11ft/lbs 2nd- 22ft/lbs. same numbers that you have according to specs in my manual. 0.8kgm=5.8ft/lbs.................3.0kgm=22ft/lbs
 
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ibuyre111

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Re: 1999 Yamaha 2 Stroke, OX66 225HP, 3.1L V6 Cylinder Head Torque Question.

Thanks for the info.
I guess I will have to find a torque wrench that goes as low as these specs. All the ones I see seem to start at about 10 ft. lbs. and go up from there.
 
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robert graham

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Re: 1999 Yamaha 2 Stroke, OX66 225HP, 3.1L V6 Cylinder Head Torque Question.

I believe I saw a 1/4" drive torque wrench at Harbor Freight tools...I know lots of their tools aren't professional quality, but it might be fine if you're just going to use it once or twice. Good Luck!
 
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ibuyre111

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Re: 1999 Yamaha 2 Stroke, OX66 225HP, 3.1L V6 Cylinder Head Torque Question.

Thanks. I checked it out and they do have one...3/8 " for about 30 bucks including shipping. It starts at 5 ft lbs.
 
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