D'oh! Atleast you were able to get it out w/o taking the head off.

 

Bolts stretch, thats how they hold. When a bolt stretches too much it looses it strength. There is a Cummins procedure that is very technical for seeing if they can be used. Drop them head first from shoulder height onto concrete, if they ring, they are good, if they land with a thud, replace them...

Mine are down to 135 ft/lbs...

 

 

i called and checked w/ cummins a while back and was told by their people to NOT REUSE THE OLD HEAD BOLTS, they are a one time use and need to be replaced whenever you pull the head, or loosen one off, they are only about 3 bucks each,

 

well after talking to a machinist he said that this bolt had stretched and was bottomed out in the block, or so he said.

 

diesel power mag did a write up about this and they said to soak the bolts in oil over night and make sure the threads on the block and bolt are perfect and clean then from 100lbs up do it in 5lbd incroments up till 135lbs. i think im going to get all new bolts and torque them to 130. that should be more then enough to hold 40psi

 

this is what the shop manual says

step ......... torque value
1 ........... 40 Nm (29 ft lb)
2 ........... 85 Nm (62 ft lb)
3 .......... 126 Nm (93 ft lbs

there is a sequence but the picture of it is bigger than allowed for uploading

AERA SAYS 66, 89 FT/LBS +90 DEG SEE TB 909

909 SAYS TORQUE TO YIELD IS AT 100 FT LBS

 

I wouldn't condone it.......
But I have heard of guys using Grade 10 or 12.9 Socket head bolts.

BTI