Posted by The tractor vet on February 22, 2016 at 17:31:04 from (104.179.81.68):
In Reply to: Re-Torquing head bolts posted by JRSutton on February 22, 2016 at 07:05:18:
Well for what i ususally work on i have never loosened any of them as when the engine is at operating temp of 165-200 degrees there is no need to back off because the head bolts are loose . Now i get a little fussy here as before we even start to stuff the pieces and parts into and engine EVERY hole in that block is chased with a bottoming tap , all holes are cleaned out and degreased nad blowen out with air . All bolt threads are chased and wire brushed cleaned and dry . Main bolts are lightly lubed same as the rod bolts and head bolts . Now one thing here on any blind hole do not get carried away with the LUBE thing as you can cause a blind hole to crack due to Hyd compression . That is easily done on a bigger Cummins engine as to others why take a chance . Over the years i have also found that ok ya retorqued the head when it was up to operating temp it may surprise you that when you think your done go back over the center ones again as oh they are loose . Many times i have pulled the heads on stuff due to a blowen head gakt and found the bolts in the center were loose . Also helps to have your torque wrwnch sent in every so often and have it checked and serviced , i do mine once a year. Yep Snap off hammers me 105 buck for this on my 1/2 drive as it gets the most use , the other three just collect dust. Only tractor engine i have worked on that the BOOK said NO retorque was on a A/C 5040 that i did last year. It said nothing about installing new head bolts and they did not look like a torque to yield style . But i do believe that getting the engine up to operating temp is the key and at times this takes a good while to do so . Ten to twenty min. does not get the job done . The block being WARM to the touch is not operating temp. . On the I H tractors you can cover the rad and run them for twenty min. and the temp gauge has NOT made it to operating temp . It may have started to move but it ain't there yet . Heck Running my 806 on a New Holland 355 grinder mixer grinding a full load will hardly get it up to operating temp. But once you get them warmed up work fast as they start to cool .
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