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D'oh! :argh: Atleast you were able to get it out w/o taking the head off.
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Originally Posted by Benjamin
(Post 455128)
had an experience tonight, i want to ask some questions, get some answers then i will go through what went down.
1. Is it "OK" to re-torque factory installed head bolts? 2. If it is "OK" to does mileage have any affect on them? 3. What is the acceptable ft/lb of Tq that you can torque the bolts to? :pca1: Mine are down to 135 ft/lbs... |
Originally Posted by 94 12valve
(Post 455139)
I have never done this my self because you can only stress a bolt so much before it breaks
Everyone I have talked to about it takes them 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, :c:
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well after talking to a machinist he said that this bolt had stretched and was bottomed out in the block, or so he said.
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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
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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 |
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