Icehole Posted May 2 Share Posted May 2 (edited) Working on putting a 1990 RD688 dump truck back on the road. Has the 400 E7, 12 speed, camelback, top loader rears (maybe all do?? I've seen some with Eaton diffs and 5-18 speeds) Has an exhaust leak between head and manifold at for sure the back cylinder, possibly the 2nd. Was really noticeable starting it one morning with the hood open, as it'll smoke for a few seconds. Are the gaskets and studs the same for all E7s? I can order a kit for around $225. I think they are 12mm studs, which makes me wonder, metric was quite rare until late 90s into 2000s. None of the kits specify a year range or anything denoting there's different kits off a CPL, serial, etc so makes me think they're all the same. Edited May 2 by Icehole Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/ Share on other sites More sharing options...
Solution Popular Post Joey Mack Posted May 2 Solution Popular Post Share Posted May 2 yes they are 12MM studs. PAI has a kit and the gaskets, felpro makes the gaskets.. be sure to put high temp sealant on the threads for the bottom studs. Those holes are live right in to the pushrod bore.. also, pay attention to how deep you go with them. You may hit the push rod, E-7's have thinner push rods than E-Techs, but just get an understanding of what you have.. Jojo 1 3 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-550952 Share on other sites More sharing options...
fjh Posted May 2 Share Posted May 2 28 minutes ago, Joey Mack said: yes they are 12MM studs. PAI has a kit and the gaskets, felpro makes the gaskets.. be sure to put high temp sealant on the threads for the bottom studs. Those holes are live right in to the pushrod bore.. also, pay attention to how deep you go with them. You may hit the push rod, E-7's have thinner push rods than E-Techs, but just get an understanding of what you have.. Jojo Just to add to Joeys comment there do a retorque after a few heat and cool cycles say a week or two of work do it cold! just sayin! 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-550954 Share on other sites More sharing options...
Joey Mack Posted May 2 Share Posted May 2 Ooops,, I forgot the torque routine,, 25 lbft,, then 50 lbft, then finish at 100 lbft..... 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-550956 Share on other sites More sharing options...
fjh Posted May 2 Share Posted May 2 10 minutes ago, Joey Mack said: Ooops,, I forgot the torque routine,, 25 lbft,, then 50 lbft, then finish at 100 lbft..... Yup you’re slipping buddy!😂 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-550958 Share on other sites More sharing options...
Joey Mack Posted May 2 Share Posted May 2 this may sound silly,, but I wish there was a big truck junk yard near me so I could just walk around and look at trucks to help me remember the things that slip my mind.. I can tell that I am losing the quick reflex of answering questions on here. and I used to rattle this stuff off in an instant.. Oh Well,,, Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-550960 Share on other sites More sharing options...
Popular Post Mark T Posted May 3 Popular Post Share Posted May 3 1 hour ago, Joey Mack said: this may sound silly,, but I wish there was a big truck junk yard near me so I could just walk around and look at trucks to help me remember the things that slip my mind.. I can tell that I am losing the quick reflex of answering questions on here. and I used to rattle this stuff off in an instant.. Oh Well,,, Jojo We still luv ya 1 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-550982 Share on other sites More sharing options...
Icehole Posted May 3 Author Share Posted May 3 Good deal. Hoping I caught it early enough that the head or manifold isn't eroded. Well... and that I don't have to drill out every stud. I gave them some Kroll a couple weeks ago over a few days. Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551003 Share on other sites More sharing options...
fjh Posted May 3 Share Posted May 3 12 hours ago, Mark T said: We still luv ya Yup we do! Just except getting old Buddy you'll be fine! Wheeling to the junk yard in your wheel chair to remember where you been probably will help later on! You got a year or two left!😅 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551010 Share on other sites More sharing options...
JoeH Posted May 4 Share Posted May 4 FYI your manifold could be eroded. My 95 was when we bought it, back cylinder. Caught it when the engine hydro locked after a rain storm shortly after we bought it. Pulled the manifold, used cast iron welding rods then ground it back down, haven't had a problem in ~13 years since. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551045 Share on other sites More sharing options...
880joe Posted May 4 Share Posted May 4 I think the early e7 is thicker where stud goes through the manifold than the later e7 so yours may need longer studs Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551048 Share on other sites More sharing options...
mechohaulic Posted May 4 Share Posted May 4 On 5/2/2024 at 6:41 PM, fjh said: Yup you’re slipping buddy!😂 he's NOT slipping! this was his way of testing who is paying attention . after joey retires, He's going to be a teacher in a technical school for mechanical studies. this "slip "was just setting format for teacher to students. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551052 Share on other sites More sharing options...
Popular Post Joey Mack Posted May 4 Popular Post Share Posted May 4 when I retire, there wont be anyone left that wants to learn how to fix something that might get them dirty, mess their hair and or break a nail... Have you seen todays ''Male's'' ?? 2 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551056 Share on other sites More sharing options...
fjh Posted May 4 Share Posted May 4 11 minutes ago, Joey Mack said: when I retire, there wont be anyone left that wants to learn how to fix something that might get them dirty, mess their hair and or break a nail... Have you seen todays ''Male's'' ?? OOOOH Ya! Amen My Brother TESTIFY ! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551057 Share on other sites More sharing options...
fjh Posted May 4 Share Posted May 4 Quite Honestly ! We had a little girl at the shop she started out in the office billing She was into racing with her dad! She decided to take on the trade ! She exceled at it she could run circles around me and a few others at the computer stuff she was 5ft 6 or so she could run circles around most of the guys doing a brake job Drums included and most any other task you thru at her! Had to help her once and awhile Welding was one of her short comings Had to train her to think like a Guy a bit ! But she was invaluable with her tiny little hands for this new rubbish that they build with no room for the big mittens like mine! IE: Fan belts ect ! She got her Trade and now has a Family of two and moved back into the warranty department ! Doing claims! Just sayin! Male or Female They are out there!! Just not many! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551058 Share on other sites More sharing options...
Popular Post Joey Mack Posted May 4 Popular Post Share Posted May 4 When my wife and I worked together at a Mack service dealer, sometimes she would help me. She has done a couple sets of cam bushings with me, during an in-frame. Then Top Brass said that she cant do that anymore, it makes the other guys look bad.. Oh well, it was kinda cool to have my wife help me.. 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551059 Share on other sites More sharing options...
Icehole Posted May 4 Author Share Posted May 4 12 hours ago, 880joe said: I think the early e7 is thicker where stud goes through the manifold than the later e7 so yours may need longer studs Hope not, already ordered the kit. Seperate the gaskets were $55, so paid ~$170 for the studs and nuts. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551061 Share on other sites More sharing options...
fjh Posted May 4 Share Posted May 4 Yup that’s cool! I wish my wife was inclined! Some times I’d like some help and mechanicaly not inclined! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551062 Share on other sites More sharing options...
The Heinz Posted May 6 Share Posted May 6 I think most if not all E7 exhaust manifold studs are the same. They may be different when it comes to ASET's, but you should be fine. Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551199 Share on other sites More sharing options...
Joey Mack Posted May 6 Share Posted May 6 (edited) Turbo studs on ASET are different Edited May 6 by Joey Mack Pour sell fone sperring Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551209 Share on other sites More sharing options...
fjh Posted May 6 Share Posted May 6 2 minutes ago, Joey Mack said: Turno studs on ASET are different Yup hard as hell and non magnetic! tough stuff! Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551213 Share on other sites More sharing options...
Icehole Posted May 6 Author Share Posted May 6 Same kit for E6, E-Tech, ASET per PAI parts.... Sure is frustrating trying to get parts for this truck! Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-551217 Share on other sites More sharing options...
Popular Post 1GreasyGirl Posted August 17 Popular Post Share Posted August 17 On 5/4/2024 at 9:27 AM, Joey Mack said: when I retire, there wont be anyone left that wants to learn how to fix something that might get them dirty, mess their hair and or break a nail... Have you seen todays ''Male's'' ?? You're not kidding, either! Imagine being a female technician and trying to date these days! You're either hurting somebody's ego, or you just can't come to grips (no pun intended) with holding hands with a "man" whose hands are softer than yours! Thank goodness my dating days are over! Sorry, guys, I couldn't help but add my two cents! 😄 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-557161 Share on other sites More sharing options...
fjh Posted August 17 Share Posted August 17 We had an apprentice girl in our shop that could run circles around a lot of these guys we hired! She now has her ticket and is now doing warranty! Think I told that story though !🤔 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74114-e7-exhaust-manifold-leak/#findComment-557185 Share on other sites More sharing options...
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