bultaco Posted August 27, 2021 Share Posted August 27, 2021 Looking to buy a 93 RD688 from a distance, seller says it is a 400 hp E7, is this a Mechanical or electronic controlled motor? Quote Link to comment https://www.bigmacktrucks.com/topic/67855-93-e7-400-questions/ Share on other sites More sharing options...
Joey Mack Posted August 27, 2021 Share Posted August 27, 2021 it may have an electronic control on the back side of the injection pump...(governor housing) easy to see., a round gray plug.. the 400 has a great power curve, and can pull anything that the other (non MACK) trucks can pull. That engine is the last of the Million Mile Engines..... with the exception of a well maintained E-Tech ......which came after that one... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/67855-93-e7-400-questions/#findComment-478978 Share on other sites More sharing options...
bultaco Posted August 31, 2021 Author Share Posted August 31, 2021 (edited) OK. so bought the truck, it has rod knocking, what year motors would be a bolt in operation? I know the electronics changed pretty regular in that era motor. Would a 95 e7 400 be a close fit? I realize these are referred to as older models, But to a guy who grew up with thermodyne then maxidyne with my last truck an 85 had an E6. now 20 years later I am back at it again, Thanks Roger Edited August 31, 2021 by bultaco Quote Link to comment https://www.bigmacktrucks.com/topic/67855-93-e7-400-questions/#findComment-479148 Share on other sites More sharing options...
fjh Posted December 11, 2021 Share Posted December 11, 2021 On 8/30/2021 at 5:26 PM, bultaco said: OK. so bought the truck, it has rod knocking, what year motors would be a bolt in operation? I know the electronics changed pretty regular in that era motor. Would a 95 e7 400 be a close fit? I realize these are referred to as older models, But to a guy who grew up with thermodyne then maxidyne with my last truck an 85 had an E6. now 20 years later I am back at it again, Thanks Roger 95 should bolt in long as its from a similar truck ! You may need to swap water pump fpr the fan to fit! and some of the external stuff the base is the same thou! ! Quote Link to comment https://www.bigmacktrucks.com/topic/67855-93-e7-400-questions/#findComment-484734 Share on other sites More sharing options...
Bullheaded Posted December 11, 2021 Share Posted December 11, 2021 On 8/26/2021 at 8:42 PM, Joey Mack said: it may have an electronic control on the back side of the injection pump...(governor housing) easy to see., a round gray plug.. the 400 has a great power curve, and can pull anything that the other (non MACK) trucks can pull. That engine is the last of the Million Mile Engines..... with the exception of a well maintained E-Tech ......which came after that one... jojo Agree. Those first mechanical and electronic E7 400's were one of the last great Mack motors. I ran one in a CL that grossed 140,000 all the time and it did everything all my other E7460's would do. But was a lot more reliable. Quote Link to comment https://www.bigmacktrucks.com/topic/67855-93-e7-400-questions/#findComment-484736 Share on other sites More sharing options...
Joey Mack Posted December 11, 2021 Share Posted December 11, 2021 yes sir.. I drove one a bit newer back in the late '90's it had an 18 spd, it out pulled the newer E-Tech 427's in the fleet. the 18 spd. helped, but the other's were 13's.. I may be off a year, about the electric gov. maybe '94 was the first year.. anyway, catch you later, jojo Quote Link to comment https://www.bigmacktrucks.com/topic/67855-93-e7-400-questions/#findComment-484739 Share on other sites More sharing options...
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