kevgibbs Posted May 6, 2022 Share Posted May 6, 2022 Hello Gents, What is the recommended (or usual) overhaul interval for a VMACII E7? I have a 1997 CH613 with a E7-400 that has about 850,000 original miles on it and I'm thinking about having my local Mack dealer do a rod and main bearing job on it this coming winter after the work season slows down. At a hot idle the engine has about 20 psi of oil pressure and runs around 35-45 psi running depending on boost pressure. These numbers seem kind of low to me but I don't know what is "usual" as far as where the oil pressure should be on the engine or how far I should let it go before it spins a bearing on the road somewhere. The truck is a very strong runner and has very little blow-by. Any input would be appreciated. Thank You! - Kevin G. Quote Link to comment Share on other sites More sharing options...
Popular Post fjh Posted May 6, 2022 Popular Post Share Posted May 6, 2022 23 minutes ago, kevgibbs said: Hello Gents, What is the recommended (or usual) overhaul interval for a VMACII E7? I have a 1997 CH613 with a E7-400 that has about 850,000 original miles on it and I'm thinking about having my local Mack dealer do a rod and main bearing job on it this coming winter after the work season slows down. At a hot idle the engine has about 20 psi of oil pressure and runs around 35-45 psi running depending on boost pressure. These numbers seem kind of low to me but I don't know what is "usual" as far as where the oil pressure should be on the engine or how far I should let it go before it spins a bearing on the road somewhere. The truck is a very strong runner and has very little blow-by. Any input would be appreciated. Thank You! - Kevin G. your oil pressure is fine ! I have rolled bearings in these at 23000 hours and saw there was a need and not ! I have rolled bearings in these at 15000 hours and seen the need and not ! However I have also seen go a lot longer ! I have seen them fail sooner ! In my mind 20000 hours plus is a good time to do it providing you have looked after the servicing up to that point ! if your servicing is un known then for piece of mind do it now! the key with mos DIESEL engines is look after the DCA in the coolant And keep after the oil changes! just the way I see it! 2 1 Quote Link to comment Share on other sites More sharing options...
terry Posted May 6, 2022 Share Posted May 6, 2022 Long as you have the pan off, oil pump too. Terry 1 Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted May 6, 2022 Share Posted May 6, 2022 if the over board breather isnt puffing like a freight train.. I would just do the bottom end and an oil pump. Then freshen up the cooling system.. new coolant, thermostat, fan clutch if its viscous, even the water pump.. Terry and FJH, nailed it.. I would easily choose PAI parts for this repair.. I'm building an E-Tech now, with PAI parts.. The oil pump actually came with a new pick-up tube.. jojo Quote Link to comment Share on other sites More sharing options...
storkmack Posted May 6, 2022 Share Posted May 6, 2022 Like the guys are saying. Roll in bearings and an oil pump and keep on humping. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted May 6, 2022 Share Posted May 6, 2022 👍 Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted May 6, 2022 Share Posted May 6, 2022 A small tip on the oil pump.If you change it make sure and count the drive gear teeth before you install.Its got to be same as the old pump. 2 Quote glenn akers Link to comment Share on other sites More sharing options...
Dirtymilkman Posted May 7, 2022 Share Posted May 7, 2022 I have a 2001 460 with a million miles and 38,000 hours. Never done bearings or anything yet. I do injectors and valve set every 250,000 and change oil every 10,000 miles using Rotella. Did 1 water pump and 1 alternator. Only thing oil samples show is high soot levels. 1 Quote Link to comment Share on other sites More sharing options...
BOBWhite Posted May 7, 2022 Share Posted May 7, 2022 Wouldn't it be cheeper in the long run to do the whole engine at once than just the bottom end? Most in-frame kits come bearings, liners, pistons, and all so why not just get a whole new engine while you still can 1 Quote Link to comment Share on other sites More sharing options...
fjh Posted May 7, 2022 Share Posted May 7, 2022 7 hours ago, BOBWhite said: Wouldn't it be cheeper in the long run to do the whole engine at once than just the bottom end? Most in-frame kits come bearings, liners, pistons, and all so why not just get a whole new engine while you still can Its all in how you look at it ! and what your plans for the future are I suppose! I am of the mind if It ain't broke don't Fix it! Preventative maintenance is ok don't poke at stuff that's treating you good! Quote Link to comment Share on other sites More sharing options...
fjh Posted May 7, 2022 Share Posted May 7, 2022 Just now, fjh said: Its all in how you look at it ! and what your plans for the future are I suppose! I am of the mind if It ain't broke don't Fix it! Preventative maintenance is ok don't poke at stuff that's treating you good! An inframe is highly in intrusive and can get expensive the more you dig the deeper you get! Quote Link to comment Share on other sites More sharing options...
BOBWhite Posted May 8, 2022 Share Posted May 8, 2022 13 hours ago, fjh said: Its all in how you look at it ! and what your plans for the future are I suppose! I am of the mind if It ain't broke don't Fix it! Preventative maintenance is ok don't poke at stuff that's treating you good! Yeah for me if it doest have blow-by and it has good oil pressure leave it alone. In my unprofessional opinion bearings don't need to be replaced unless it's knocking. Ive seen bearings come out of million mile motors look new so as long as you use good oil and filters I say keep running em 1 Quote Link to comment Share on other sites More sharing options...
terry Posted May 8, 2022 Share Posted May 8, 2022 44 minutes ago, BOBWhite said: Yeah for me if it doest have blow-by and it has good oil pressure leave it alone. In my unprofessional opinion bearings don't need to be replaced unless it's knocking. Ive seen bearings come out of million mile motors look new so as long as you use good oil and filters I say keep running em the only thought of waiting till you hear a knock, have you already scored the crank! terry 1 Quote Link to comment Share on other sites More sharing options...
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