jdfordhd Posted February 10, 2016 Share Posted February 10, 2016 When shopping for a used Mack I know practically every E-6 and E-9 are dependable engines. But as my tire kicking might have me looking at later year models, I'm asking for opinions on which Mack engine should be avoided like the plague..?!? Quote "If it ain't got a motor, I ain't interested.!!" Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/ Share on other sites More sharing options...
m16ty Posted February 10, 2016 Share Posted February 10, 2016 The earlier v8 engines weren't their best. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-323689 Share on other sites More sharing options...
hatcity Posted February 10, 2016 Share Posted February 10, 2016 E-7 is good. Anything between 2003 and 2006 had problems. 1 Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-323709 Share on other sites More sharing options...
terry Posted February 10, 2016 Share Posted February 10, 2016 What do you call later year models? Quote Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-323712 Share on other sites More sharing options...
jdfordhd Posted February 10, 2016 Author Share Posted February 10, 2016 What do you call later year models?I meant later than the E6 and E9 that I consider to be great engines. Quote "If it ain't got a motor, I ain't interested.!!" Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-323748 Share on other sites More sharing options...
Keffer inc Posted February 13, 2016 Share Posted February 13, 2016 My 1999 CH613 with the E7-380HP isn't the strongest pulling truck out there, but very dependable. Other leased trucks at my company like 2012 Peterbilts break down every three months. I've heard to avoid 04-06 engines. When ever they started using VGT Turbos. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-324016 Share on other sites More sharing options...
Full Floater Posted February 13, 2016 Share Posted February 13, 2016 What years were the early V8s? What were there issues? Quote Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-324067 Share on other sites More sharing options...
bbigrig Posted February 13, 2016 Share Posted February 13, 2016 Hatcity nailed it. E7 from 91-97 great engines. 98-2003 are meh. 2003 to 2007 are full of issues. MP8 2008 to 2010 are pretty good. The bottom end of MP8 are bullet proof but have issues that can be fixed in the top end without removing the head. Get the exhaust aftertreatment crap deleted and you've got a pretty good unit. 2003 and up to today have sensor/harness issues that seem to increase the newer they get. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-324073 Share on other sites More sharing options...
Devilsnight Posted February 17, 2016 Share Posted February 17, 2016 If its earlier than 04 you should be fine. The aset's and MP's are junk. I never had a problem with anything earlier than this e6/e7/etech. I work on a fleet of 01-current and the 01/03s are the only ones that don't have constant engine related problems. Been here sine 2005, so I've seen the 'good ones' 1 Quote Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-324635 Share on other sites More sharing options...
Clovis Kapongo Posted February 23, 2016 Share Posted February 23, 2016 Who as some information about 2004 Mack CX 613? Quote Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-325399 Share on other sites More sharing options...
Dirtymilkman Posted February 23, 2016 Share Posted February 23, 2016 Stay away from 2004's Quote Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-325400 Share on other sites More sharing options...
TRH Posted March 5, 2016 Share Posted March 5, 2016 The latest I'd go is the ASET AI. The AC was were the shit begin. The MP is mechanically, very very reliable. It's all the attached bullshit that will run your purse dry. Emissions controls, and the usual injector eating. The worst part is, you let a failure go very long, and the shit hits the fan - it's a landslide. Sent from my iPhone using Tapatalk 1 Quote Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-326568 Share on other sites More sharing options...
brettj3876 Posted March 19, 2016 Share Posted March 19, 2016 Earlier Etech's liked to eat cams and the aset liked its turbos. Don't know if mp is still having injector cup issues or not. E6 if you lugged it way more than necessary would sometimes crack the last 2 cyl from all that low end grunt 1 Quote Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-327867 Share on other sites More sharing options...
TRH Posted March 23, 2016 Share Posted March 23, 2016 Even the 2016s are showing injector issues already. No end in sight until common rail, maybe. Sent from my iPhone using Tapatalk 1 Quote Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-328274 Share on other sites More sharing options...
C. D. Litton Posted July 27, 2021 Share Posted July 27, 2021 Getting fuel in oil. Put on new fuel pump sealed all unit pumps. Use priming pump to pressurize system and getting fuel dripping down across crankshaft. Where are we loosing fuel? Quote Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-477493 Share on other sites More sharing options...
Vmac3 Posted August 1, 2021 Share Posted August 1, 2021 On 7/27/2021 at 3:10 PM, C. D. Litton said: Getting fuel in oil. Put on new fuel pump sealed all unit pumps. Use priming pump to pressurize system and getting fuel dripping down across crankshaft. Where are we loosing fuel? There are several threads that address this issue. You have continued from a thread 5 years ago. Year make and model of your truck should be added so the community can help you out. V 2 Quote Link to comment https://www.bigmacktrucks.com/topic/43948-engines-to-avoid/#findComment-477750 Share on other sites More sharing options...
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