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Had that problem a few years ago with a '97 e7-427 with about 500,000 on it , after changing thermostat , cap and tanks noticed with a new clear tank bubbles were showing up long after shutdown thought it was too long to be a compression leak . It ended up being a bad compressor air pressure was going back through the collant line. We replaced the compressor problem solved truck now has 850000 still going strong

Are you talking about Midwest DS in Bollingbrook or Peru ? I've done buisiness with Peru and also before it got bought out by Midwest a couple yrs ago . They have done some real good work for me and some questionable work . I am pretty fussy about that stuff and am pretty knowledgable about this stuff .

I have a 1997 CH E7-427 . Last winter after an unfortunate deal with Northern IL Mack , LaSalle , I took the truck to Midwest Peru , ended up getting the pump and injectors rebuilt . Had 29000hrs and 760,000mi and never been touched , does run better now , quicker to build boost and starts better . I tried to get them to make a 454 or 460 out of it but with all this electronic s!!t (sorry I,m old school) they can't do it . The unfortunate deal with NILM stemmed from a clutch replacement deal I posted it last spring on here . NILM is now part on the CIT group , the shop foreman and a couple others are now GONE from there !! By the way when I got it back from Midwest the valve cover gasket leaked and they cracked the hose outlet on the coolant expansion tank . Of course they said they didn't .

Midwest in Bollingbrook is supposed to have a truck dyno I was thinking of taking mine up there this winter to se what its got or not . That's about all I can tell you about shops around here , myself i'm not impressed with any shop these days , farm equipment , heavy , trucks and cars for $100+/hr I except more than guessing and parts changers .

They supposedly used my flywheel , he said it had been cut before and that was the last time it could be resurfaced . I told him to call me when it was all torn down and I wanted to see everything but nobody called . They do the resurfacing themselves but could have got mixed up . This one is a VMack , the inline pump with electronic governor control . The rpm pickup in the pump is suposed to be bad . He mentioned about the sensor adjustment . Thanks for the reply .

Took my perfectly good running CH E7-427 to the Mack shop for a simple clutch job . 740k miles , had it for 4 yrs , know history of truck , came from this dealership new . Anyway , got the clutch done , machined flywheel , new rear main seal , changed seal on front diff output shaft and everything else seemed ok . $3500 and change later we head to the farm . Eight miles to home never went over 1500rpm bobtailing etc . Couple days later I deciede to haul couple loads of gravel , 15 mi round trip . Take off , get up to 18-1900rpm starts missing , cutout etc , start to wonder what's going on . Pulls good though up to there , 34-5 #boost going up hill . Get to stopsign , shift down , range and splitter in low , let out clutch , no go . They routed the air line to the stationary neutral valve right under the exhaust pipe , burned through left range go into neutral . They wanted to tow it , but came out and fixed it on sight . Next day I hauled the other load and took the truck back to the shop . Told them about the rpm problem and also the clutch brake wasn,t adj properly .

Called me next day said truck was done . Said the tach sensor at flywheel was a little off on ohms reading but it worked and would probably be ok . Took off again , started cutting out at 17-1800 now and was worse than before . Got off at the next exit and headed back to shop again .

They changed the flywheel sensor didn't help and really sounded worse , now it smoked and missed worse when you reved it . Next they changed out the sensor on the injection pump . That didn't work either , now they say the inj PUMP IS BAD !!!! That sensor was changed last July when the econovance solenoid was replaced .

Now what I can't figure out is how a SUPPOSEDLY PROFFESSIONAL SHOP at $85/hr can really f*******p a really nice good old truck . Could they have shorted out something in the wire harness or something . I said what if a pump rebuild doesn't work out , we are at a stand still as or Fri PM . I'm not a proffessional mechanic but I have done lots of wrenching here , Chevy , Deere engine and trans , and I do know what's going on . I do know about inj pumps , the old mechanical inlines and rotaries ,been tractor pulling for 40 yrs . I think they MESSED UP . I'm going there tomorrow AM and try to keep COOL but it's gonna be hard to do . SORRY FOR THE RANT !!!!

Have a '97 CH E7 427 , 18sp All Mack , 740,000mi . We've had it for 300,000 or so mi . Done for the season now and about due for a clutch . 75% use in construction and rest is for farm and most of that is pulling out of fields , grain bins or elevators. Every shop I talk to talks about a 1850# easy pedal eaton new or rebuilt for half the price . Are they on the right track or what other options do I have . I'm going to have the rear main seal changed and anything else that needs to be . It's a good truck and I'm planning to keep it for quite a while so I want to fix it right . Any input will be really appreciated . TIA

I have a '79 237 , I think it's an ETZ not exactly sure , I can get the exact###'s , it is in the shop taking up space . Anyway it dropped a sleeve 7 years ago been sitting ever since . I bought another parts truck with a good engine in it . It is complete , turbo , inj pump , compressor etc . Ran real good prior , has been inside all the time . Any value to it ? it is time to clean out the shop . Any body need parts ?? Located in north central Illinois just off I -80 middle of the state .

Does anybody know if there is a kit for this , used to be a kit called Cabmate but they tell me it is no longer available . Anyone have ideas or information on this ? Thanks for all .

I just found this forum last week , the 9 speed was discussed a page or so back , I have a couple questions also .

Here's my story : We have a 1988 R688 350hp 9sp 530,000+- mi , overall it is a pretty good old truck . Bought it in 2000 after our 1979 237 dropped a sleeve in the oil pan . We use it on the farm and son is now running it on construction . The range never shifted right to me or my son , would hang up going into hi once in a while and made too much noise to my estimation , course I was used to the old 2 stick 6sp .

A year ago the 1st rev shift fork broke and due to timing I took it to my local Mack dealership . At the right time we could have fixed it or at least removed it and had it done . I have all the Mack manuals , in there it tells something about all the interlock settings etc . and all the updated parts for the trans . Anyway I told them to check all this out . They removed the trans , took the top off , put 3 new shift forks in , total parts was $800+ , labor $2000 . I thought that was pretty steep . They showed it to me , the clutches seemed to look ok to me and them too , they said that new clutch pack would be $2500+ . With only running 10-15,000mi/yr we thought we could get by with leaving it alone , just check the air cylinder and linkage . Well when we got it back it seemed to make more noise and hang up more often .

Now what do we do? Is there an aftermarket source for these parts or are they available only through Mack?This winter when I have more time I can remove it and work on it .

What does it take to convert to a 13sp Roadranger ? I have a line on one of them , neighbor has one that is behind a 400 Cummins , it is a RTO12513 , what else do I need to know about it ?

I am pretty knowledgeable on John Deeres and other farm machinery but not really up to snuff on this stuff .

I am open to all ideas , suggestions , other options or whatever . All replies will be greatly appreciated , Thanks in advance , Jim