fastboater Posted October 9, 2015 Share Posted October 9, 2015 I recently had a engine let go in one of my R686ST. Motor was a 287hp 2 valve engine. Truck has a 5 speed currently.Im wanting to know if I can put a E7 350 mechanical engine in this truck and if it can be done what conversions or modifications would I might need?Im thinking I might have to dial down the pump a little, but I heard it is doable.Thanks Lee Quote Link to comment https://www.bigmacktrucks.com/topic/42133-e7-engine-in-a-r686st/ Share on other sites More sharing options...
msm1365 Posted October 9, 2015 Share Posted October 9, 2015 if engine changed you need to change gearbox and likely axels. because engine torque changed. Quote I'm trucking journalist : http://www.truckdriver.ir/ Link to comment https://www.bigmacktrucks.com/topic/42133-e7-engine-in-a-r686st/#findComment-306803 Share on other sites More sharing options...
theakerstwo Posted October 10, 2015 Share Posted October 10, 2015 With a 5 speed it needs to be a EM7 and if it was a EM7 300 it would be better.EM7 is a maxidyne and your E7 pump could be changed to a E& pump for high torque which is needed for a 5 speed. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/42133-e7-engine-in-a-r686st/#findComment-306827 Share on other sites More sharing options...
fastboater Posted October 10, 2015 Author Share Posted October 10, 2015 EM7 350 with a mechanical injection pump. the pump needs to be tuned to a 300 maxidyne specs is this what Im hearing? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/42133-e7-engine-in-a-r686st/#findComment-306875 Share on other sites More sharing options...
felicello122 Posted October 10, 2015 Share Posted October 10, 2015 It will work Quote Link to comment https://www.bigmacktrucks.com/topic/42133-e7-engine-in-a-r686st/#findComment-306879 Share on other sites More sharing options...
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