Popular Post Freightrain Posted 14 hours ago Popular Post Share Posted 14 hours ago It has started. Will take time, not sure how fast it will happen. I have legs made up to get it off the floor and I can drop the pan. Local guy has std pan that he will trade for my ESI pan(that won't fit my chassis). Found a couple loose exhaust rockers(like more then 1/8" lash)hope that isn't a cam failure! Didn't make any bad noises while running and had 70# oil pressure. Will investigate that further. My 3/4" IR won't break the head bolts loose, but was using adapter for 1/2" socket. Need to buy a good 3/4" socket and see if that improves the performance. Should have some updates next week? 6 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/ Share on other sites More sharing options...
70mackMB Posted 14 hours ago Share Posted 14 hours ago Welcome back Larry. .....Hippy 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/#findComment-578734 Share on other sites More sharing options...
Geoff Weeks Posted 14 hours ago Share Posted 14 hours ago 3/4" breaker bar and cheater pipe are my go-to for stuff like that. Cheap to replace if something lets go. I have a torque multiplier for going back together. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/#findComment-578737 Share on other sites More sharing options...
mrsmackpaul Posted 12 hours ago Share Posted 12 hours ago If my memory is correct, which is doubtful I reckon the head bolts are 220 pound so thats pretty tight, yeah a breaker bar and pipe as Geoff suggests is probably needed Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/#findComment-578741 Share on other sites More sharing options...
Joey Mack Posted 9 hours ago Share Posted 9 hours ago Those head bolts are torqued to 205 lbft. A 3/4" breaker bar with a 3/4" socket should do it. 220 lbft is the highest i would go, when going back together, but 205-210 is plenty. Do you have the torque pattern, and it is 3 rounds tol done.. Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/#findComment-578748 Share on other sites More sharing options...
fjh Posted 9 hours ago Share Posted 9 hours ago 5 hours ago, Freightrain said: It has started. Will take time, not sure how fast it will happen. I have legs made up to get it off the floor and I can drop the pan. Local guy has std pan that he will trade for my ESI pan(that won't fit my chassis). Found a couple loose exhaust rockers(like more then 1/8" lash)hope that isn't a cam failure! Didn't make any bad noises while running and had 70# oil pressure. Will investigate that further. My 3/4" IR won't break the head bolts loose, but was using adapter for 1/2" socket. Need to buy a good 3/4" socket and see if that improves the performance. Should have some updates next week? Just run the over head and check not the hard! Loose means nothing unless you’re on the valve set marks! That space is there to make the engine brake function! 220 is bolt tourque that said as Joey mentioned top end with studs ! Esi Engine 53 quart pan! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/#findComment-578749 Share on other sites More sharing options...
Freightrain Posted 7 hours ago Author Share Posted 7 hours ago No engine brake(dynatard) that I'm aware of. I would assume, like a gas engine, that even at TDC there should only be max clearance(.020?). Not +.150. all the rest that I could check without rotating it, were pretty close to .020 sumthin. Going by "feel". It's coming apart, so I will make sure things are okay. Could just be lack of maintenance. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/#findComment-578754 Share on other sites More sharing options...
Freightrain Posted 7 hours ago Author Share Posted 7 hours ago 1 hour ago, Joey Mack said: Those head bolts are torqued to 205 lbft. A 3/4" breaker bar with a 3/4" socket should do it. 220 lbft is the highest i would go, when going back together, but 205-210 is plenty. Do you have the torque pattern, and it is 3 rounds tol done.. Have to wait to get engine on legs, as it is just sitting on a few pieces of wood. Any big bar will have it laying on its side, on the floor! 😨 I remember the 673 was like 150#? when I replaced a few broke studs years back. At least that is what I pulled it to because that was all my torque wrench would go. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/#findComment-578756 Share on other sites More sharing options...
Joey Mack Posted 7 hours ago Share Posted 7 hours ago I cant post the picture of my book. So here ot is for head bolts on your tip turbine. Lightly oil the bolt threads, amd washers and the top of the holes in the head. Not the block threads. 3 stages of torque is , 50-125-200 lbft. . I wish i could post the torque pattern. I will try again.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/#findComment-578757 Share on other sites More sharing options...
Joey Mack Posted 7 hours ago Share Posted 7 hours ago https://photos.app.goo.gl/SYoBuVFDPgd92ayM7 Try this link 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/#findComment-578761 Share on other sites More sharing options...
terry Posted 7 hours ago Share Posted 7 hours ago Looks like you have bolts and not studs and nuts for headbolts, be sure to chase all threads and bottom tap and blow out bolt holes. Terry 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/#findComment-578763 Share on other sites More sharing options...
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