Great White Posted February 2 Share Posted February 2 Good afternoon all: We are working on a very well used Mack AC attempting to pull the cylinders cast in pairs retained by six 5/8-18 crankcase studs . The service manual describes only removing the six nuts to remove the cylinders. The cylinders do not move even with the engine hoist wanting to lift the truck . We are trying hard not to break anything along the way. Any wisdom from someone who has been there done that would be greatly appreciated! Quote Link to comment https://www.bigmacktrucks.com/topic/76372-mack-ac-cylinder-removal/ Share on other sites More sharing options...
Solution T-Mack1 Posted February 3 Solution Share Posted February 3 Have you tried to apply heat to the engine block to expand the metal? And, heat cycling where you use a penetrating oil to cool it back down may help. DO NOT hammer on it. The metal could be brittle with age. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76372-mack-ac-cylinder-removal/#findComment-590568 Share on other sites More sharing options...
Great White Posted February 7 Author Share Posted February 7 Thank you T-Mack1: That will be the next step . The plan is to use a soft flame like from a propane weed burner and try to heat the aluminum crankcase evenly . We are hoping It will grow in size at a greater rate than the cast iron cylinder assembly and let go. We are being very careful to not break anything long the way . This old dog is 100+ years old. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/76372-mack-ac-cylinder-removal/#findComment-590770 Share on other sites More sharing options...
Great White Posted 6 hours ago Author Share Posted 6 hours ago Many thanks to T-mack1: With some heat from the handy flamethrower and some PB Blaster we have liftoff . The crankcase studs were seized in mounting holes in the cylinder base . A few strokes with the cherry picker started to lift the front axle then the cylinder came up . Next need to mike the bores and see if they are serviceable . The ring grooves have excessive wear but can be squared up on the lathe easy enough. The bores look good and there is not a pronounced ridge at the top of ring travel . This old dog has fared well despite being 100 years old. Cheers! Quote Link to comment https://www.bigmacktrucks.com/topic/76372-mack-ac-cylinder-removal/#findComment-591848 Share on other sites More sharing options...
Latrobe Construction B-61 Posted 4 hours ago Share Posted 4 hours ago That sounds like a win. That old dog will be running again before you know it. Sounds like a very interesting project. Keep up the good work. Quote Link to comment https://www.bigmacktrucks.com/topic/76372-mack-ac-cylinder-removal/#findComment-591849 Share on other sites More sharing options...
skydawg Posted 17 minutes ago Share Posted 17 minutes ago Hi,just wondering how the bores can get worn when there`s a liner...isn`t the liner there to take all the wear and preserve the bore? Quote Link to comment https://www.bigmacktrucks.com/topic/76372-mack-ac-cylinder-removal/#findComment-591859 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.