Mike Posted July 9, 2012 Share Posted July 9, 2012 Would anyone have part numbers for the END673-P engine liners? I only found a 3521 P on one liner and the rest of them had vanished cause from rust. I have all piston numbers which are standard from top of pistons.Many Thanksmike Quote Link to comment https://www.bigmacktrucks.com/topic/26126-673-p-engine-liners/ Share on other sites More sharing options...
Freightrain Posted July 10, 2012 Share Posted July 10, 2012 Daggone you got that thing in ALL its pieces!!!!!Wanna trade when you're done?? LOL!!! Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/26126-673-p-engine-liners/#findComment-127923 Share on other sites More sharing options...
39 Baby Mack Posted July 10, 2012 Share Posted July 10, 2012 All the dry liners for a Mack six cylinder are the same unless they are made for a fire ring or are for an END 711(5" bore).What you need to do is clean the bores out in the block and measure to see what size O.D. liners you need.Liners used to come in std. , P2(.002" over),P4(.004" over) P6,P8,P10,P12,P20,P30---don't know how many are still available.I used to use a trick to find out what size liners were in an engine after I removed them---using a ball faced mic measure the wall thickness about an inch up from the bottom of the liner.Here's where the memory fails me, used to be a std. would mic out at either .107" or .109" can't remember which one for sure but think it was .109".So if you check the thickness of the liners and they mic out at .110" they would be .002" over or P2's, if they mic out at .111" they would be .004" over or P4'sHope this is of some help to you.Ron Quote Link to comment https://www.bigmacktrucks.com/topic/26126-673-p-engine-liners/#findComment-127995 Share on other sites More sharing options...
Rob Posted July 10, 2012 Share Posted July 10, 2012 All the dry liners for a Mack six cylinder are the same unless they are made for a fire ring or are for an END 711(5" bore).What you need to do is clean the bores out in the block and measure to see what size O.D. liners you need.Liners used to come in std. , P2(.002" over),P4(.004" over) P6,P8,P10,P12,P20,P30---don't know how many are still available.I used to use a trick to find out what size liners were in an engine after I removed them---using a ball faced mic measure the wall thickness about an inch up from the bottom of the liner.Here's where the memory fails me, used to be a std. would mic out at either .107" or .109" can't remember which one for sure but think it was .109".So if you check the thickness of the liners and they if mic out at .110" they would be .002" over or P2's, if they mic out at .011" they would be .004" over or P4'sHope this is of some help to you.RonUse a piston wrist pin for the rounded surface if you don't have a ball end micrometer.I used to do the same thing Ron and you are "spot on" with the advice. I've seen several engines that used differing sets of liners too and some never being rebuilt so each needs to measured before ordering replacements unless the block is to be bored.RobRob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/26126-673-p-engine-liners/#findComment-128002 Share on other sites More sharing options...
Mike Posted July 10, 2012 Author Share Posted July 10, 2012 Thanks Ron for the advice. All pistons are standard with this number. G-6 4.869 41232 - P1Number 1 piston is standard but it has a different code of CAM - G - 6 this piston was replaced at some time in it's life with another owner. 41232 - P1Ok sounds like a good deal Larry, but ya need to send a photo of your G/F and then i'll decide. LOLmike Quote Link to comment https://www.bigmacktrucks.com/topic/26126-673-p-engine-liners/#findComment-128042 Share on other sites More sharing options...
39 Baby Mack Posted July 11, 2012 Share Posted July 11, 2012 MikeThe pistons are always the same size, it's the O.D. of the liners that fit into the bores in the block that change.These could be different sizes from previous rebuilds or a lot of other reasons.If the bores in the block are out of round or tapered then they have to be either honed out or machined to accept an oversize liner these have to have a good snug fit so proper heat transfer can take place.Ron Quote Link to comment https://www.bigmacktrucks.com/topic/26126-673-p-engine-liners/#findComment-128187 Share on other sites More sharing options...
Mike Posted July 12, 2012 Author Share Posted July 12, 2012 MikeThe pistons are always the same size, it's the O.D. of the liners that fit into the bores in the block that change.These could be different sizes from previous rebuilds or a lot of other reasons.If the bores in the block are out of round or tapered then they have to be either honed out or machined to accept an oversize linerthese have to have a good snug fit so proper heat transfer can take place.RonI see what you mean now Ron. I'll mike all of them and see if any are different Outside Diameters. I hope I can still get these liners.mike Quote Link to comment https://www.bigmacktrucks.com/topic/26126-673-p-engine-liners/#findComment-128326 Share on other sites More sharing options...
Vladislav Posted July 17, 2012 Share Posted July 17, 2012 Are dry liners easy to pull out?I have experience of relining old Mercedes car diesels and we had to bore them out.Vlad Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/26126-673-p-engine-liners/#findComment-129321 Share on other sites More sharing options...
39 Baby Mack Posted July 18, 2012 Share Posted July 18, 2012 It all depends on how the original fit was.If you look at the picture Mike posted you see the really rusted ones that probably "grunted" pretty good coming out.Then if you look at the shiny ones they weren't as bad.O.T.C. makes a hydraulic puller rated at 17 tons to pull the Mack dry liners.I had one of these that worked very well. Also had a homemade one using a bottle jack that did the job too.Ron Quote Link to comment https://www.bigmacktrucks.com/topic/26126-673-p-engine-liners/#findComment-129383 Share on other sites More sharing options...
theakerstwo Posted July 18, 2012 Share Posted July 18, 2012 They are hard to get out.I use a home built with a power ram to pull but its hard to use it on the rear cyl if in the frame.Here is another puller that will work on the later mack engines. Some times i have to run a few beads up and down the inside of the liner with welding rod tro pull. glenn Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/26126-673-p-engine-liners/#findComment-129385 Share on other sites More sharing options...
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