95mackrd Posted October 18 Share Posted October 18 Hi all had a question I’m struggling to find an answer for. got a 95 rd688s e7 400 Mack, just got done redoing the exhaust cause it rotted away. fired up to check for leaks and I noticed a puff of smoke from under the hood. Had the ole man shut it off and restart and noticed the exhaust housing on the turbo was cracked, almost all the way around the edge of the clamp for the center section. Sorry for the lengthy backstory. Anyway on to my question. got on market place found a s400 turbo rebuilt from a ch model Mack at the local turbo shop for 500 bucks kinda hard to pass up with all the gaskets. But I’ve Ben getting conflicting info on part numbers and from people saying the 400 e7 had a s300 turbo and the “bigger” motors had s400 but some 400 Mack’s had the s400 if it is for the “bigger” motor would I be able to run it with out pump work or injector work and just watch the pyro or? any help or knowledge would be greatly appreciated! Thank you. Not trying to go spend 1400 at Mack for a “new” turbo picture of the new heat shield and stack top after a little spit shine. Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/ Share on other sites More sharing options...
Joey Mack Posted October 18 Share Posted October 18 the most popular turbo I saw was the shwitzer S-400 SO41... I am not a guru on these.. here are some specs from my Book.. sorry about the links, I cant post pictures anymore... https://photos.app.goo.gl/zB55w73xWV612ocL9 https://photos.app.goo.gl/krYpkXQNvxUWnZMm7 https://photos.app.goo.gl/dZCKnYxR7pcQ5ZAaA Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560331 Share on other sites More sharing options...
95mackrd Posted October 19 Author Share Posted October 19 well ended up just biting the bullet and buying it. It was a good deal. It is a little bit different on the intake housing has like a 45 degree bend to it. I’ll take some pictures tomorrow. And the oil feed line is different. Shouldn’t be to hard to to make work tho Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560345 Share on other sites More sharing options...
Joey Mack Posted October 19 Share Posted October 19 (edited) your fine, it does fit under the hood, right? Edited October 19 by Joey Mack Pour sperring 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560348 Share on other sites More sharing options...
95mackrd Posted October 20 Author Share Posted October 20 21 hours ago, Joey Mack said: your fine, it does fit under the hood, right? Yes it does fit under the hood. Sorry got busy and haven’t had time to mess with it much more or take pictures. But I looked at it a little more last night and I’m wondering if the compressor housing would swap over so I wouldn’t have to rig something new together. Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560378 Share on other sites More sharing options...
Joey Mack Posted October 20 Share Posted October 20 is the inlet to the volute a different size? just curious .. Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560380 Share on other sites More sharing options...
95mackrd Posted October 21 Author Share Posted October 21 Haven’t taken the old on off yet to know for sure digging into it right now On 10/20/2024 at 5:14 AM, Joey Mack said: is the inlet to the volute a different size? just curious .. Attached photos of the old vs new. News on the bench. Gonna pull it off and see if the volute is the same size. Looks really similar in pictures and in person 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560470 Share on other sites More sharing options...
95mackrd Posted October 21 Author Share Posted October 21 On 10/20/2024 at 5:14 AM, Joey Mack said: is the inlet to the volute a different size? just curious .. Okay so not 100 percent sure what the numbers mean on the inside. I measured the id of both on both and they came out near the same, old one being a tad bigger just cause the casting is shot in between them. I measured quite a few different things and there all basically the same size the only difference I found was the Id of the inlet on the new one was 3” and the old one 2.9” checked with a caliper. Think it’s safe to swap housings on the compressor side? Should I pull them off and measure the fin before swapping? Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560474 Share on other sites More sharing options...
Joey Mack Posted October 21 Share Posted October 21 i dont know.. just swap the volutes to see if the fitment and clearence is good.. the new one uses a slip on boot and not a clamp on so yo still have some mods to do if the volute doesnt fit.. You are still in good shape, because you paid 1/3rd the price for the turbo than you could have and it is a more common turbo for E-Techs and there are guys here at BMT that would probably buy it from you if it doesnt fit right.. Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560475 Share on other sites More sharing options...
95mackrd Posted October 21 Author Share Posted October 21 15 minutes ago, Joey Mack said: i dont know.. just swap the volutes to see if the fitment and clearence is good.. the new one uses a slip on boot and not a clamp on so yo still have some mods to do if the volute doesnt fit.. You are still in good shape, because you paid 1/3rd the price for the turbo than you could have and it is a more common turbo for E-Techs and there are guys here at BMT that would probably buy it from you if it doesnt fit right.. volute? I thought that was the exhaust housing in the picture? Sorry if I misunderstood. I’m not an expert by any means i definitely am a backyard mechanic learning as I go lol. So I swapped the compressor housing the old one fits on the new one just fine spins freely out of curiosity I put the new on on the old turbo and it won’t spin? Should I put it back to how it was and just get myself the right fittings for the intake? Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560476 Share on other sites More sharing options...
Joey Mack Posted October 21 Share Posted October 21 yes, so there is the exhaust side and the compressor side, Volute is a common name for centrifugal pump housings.. No need to be an ''expert'' a good mechanic is an expert.. if the old one fits the turbo you want to use, then you may be good.. how does the compressor wheel look clearence wise compared to the old housing..? Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560478 Share on other sites More sharing options...
Joey Mack Posted October 21 Share Posted October 21 sorry.,, I read this again, and got confused.. so the new housing wont let the turbine spin?? Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560479 Share on other sites More sharing options...
95mackrd Posted October 21 Author Share Posted October 21 So the old housing on the new center section spins just fine. out of curiosity I put the new housing on the old center section and it hits the fins on the inside almost seats all the way it’s probably just a few thousands that hits. my thought process was if they both spin freely with swapped housings then I’m good. Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560480 Share on other sites More sharing options...
Joey Mack Posted October 21 Share Posted October 21 yeah, well if the swap you want is good I would think you can run it.. It's hard to give a good answer when we are not there to see it.. Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560482 Share on other sites More sharing options...
95mackrd Posted October 21 Author Share Posted October 21 I understand that. I might just take them to the local turbo shop to get there opinion 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560486 Share on other sites More sharing options...
terry Posted October 22 Share Posted October 22 15 hours ago, Joey Mack said: yeah, well if the swap you want is good I would think you can run it.. It's hard to give a good answer when we are not there to see it.. could there be a small difference on the turbo fins? And the inside of the housings ? Would fit one way with to much clearance and the other way fins are rubbing the housing? Terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-560526 Share on other sites More sharing options...
95mackrd Posted October 31 Author Share Posted October 31 Sorry for the late update it’s Ben a busy week or so. ended up taken both turbos to the turbo shop, we messed with them on the counter for a bit pulled some measurements, and got the answer of it would probably work but not recommended so I hopped on the ole Interwebs and got a 3.5” to 4” boot, a 20 degree aluminum 4” pipe, and a new section of 4” boot. Pictured belowalso went to the local hydraulic line shop and came up with an oil feed line. Not a big fan of it gonna redo it when I get time. anyway pre oiled the turbo, let it run for awhile cause the turbo sat on a shelf for a few years. Took it on the first drive after awhile of idling and retorquing bolts. drives better then it ever has, spools up a tad bit faster and seems like it pulls good. Haven’t put a load behind it to see what it does but definitely seems a lot better. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74652-95-e7-400-turbo-question/#findComment-561098 Share on other sites More sharing options...
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