Didn’t have one that went below 100 inch pounds.
Stop in for a cup of coffee
- Thread starter toolmanmike
- Start date
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Damn the Cummins injector bolts are 22 bucks a pop… for a m6x1.0 grade 12.9.
20-200 at Harbor freight. Atually calibrated also.
They won’t have them.
Why???
They have them listed...
You don't have to go to Cummins to buy their overpriced bolts when you can get a similar replacement from a fastener supply house much cheaper for the same thinjg...
Pretty much . Gonna try Cummins direct later. Or see if I can snag a pair from the junkyard
Good question.
Looking up the general recomendations on class 12.9 I see 12 to 13 ft lbs as the range published at internet sites.
So 144 in lbs.
Lets try thinking about other possibilities.
Do you still have the broken head?
Lets see a couple close ups.
Maybe it damage before you tightened it down, like a fracture.
Or maybe there was interference and the head wasn't contacting its mating surface.
Classic situation is junk at the bottom of a blind hole or a screw that is too long.
Its why we chase all the female threads
before bolting an engine or transmission together
That's a 12.9?
Full threaded up to the flange?
just add to the reasons Carroll Smith disliked metric bolts
Threaded ones are easier to engageI chase all females whether they are threaded or not...
I ran a tap down thru the bolt holes and blew it out with the air gun. Twice. No I think it was a combination of the torque wrench not being accurate and me not quite having the feel for such low torque. I hung 35 pounds of known weight in 5 pound increments off the handle of the torque wrench before it finally clicked. With it set at 45 inch pounds.
I’ll get pics later this morning. The one just sheered in half, which actually is a good thing cause I wouldn’t have noticed that the other one had stretched and bent
Supposedly so. According to Cummins themselves.
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Stretched !????
Looking at the rockwell and iyild for a 12.9 I would expect they would snap or shear.
Would need to look up the full specs to see if it was annealed as well as the yield verses ultimate strength.
I haven't ha d to deal much with metric stuff so just going with the book stuff here
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