FireMech307 Posted February 12, 2020 Share Posted February 12, 2020 I am looking for some service info for a EN-707A engine in our 1951 85LS pumper. I'm interested specifically in the ignition timing procedure, but could definitely use as much info as possible. I haven't contacted the historical museum as of yet. Quote Link to comment https://www.bigmacktrucks.com/topic/60966-en-707a-service-information/ Share on other sites More sharing options...
CaptainCrutch Posted February 12, 2020 Share Posted February 12, 2020 I'd surely contact the museum. They'll be able to provide to you manuals that will tell you everything you need to know when working on the engine. I'd send you the info from my engine but mine is a 707B which one of the things they changed is the timing to make it a little more fuel efficient. Quote Who needs a back yard when you could have a Yard?! Link to comment https://www.bigmacktrucks.com/topic/60966-en-707a-service-information/#findComment-442580 Share on other sites More sharing options...
FireMech307 Posted February 12, 2020 Author Share Posted February 12, 2020 CaptainCrutch, thank you for the response. I did reach out to the museum so hopefully in a month or two I'll have some good information. Does that 707B have dual distributors? The issue we're having is that the distributors don't want to turn to be adjusted. Maybe that's not the way to adjust the timing? Quote Link to comment https://www.bigmacktrucks.com/topic/60966-en-707a-service-information/#findComment-442583 Share on other sites More sharing options...
CaptainCrutch Posted February 12, 2020 Share Posted February 12, 2020 6 minutes ago, FireMech307 said: CaptainCrutch, thank you for the response. I did reach out to the museum so hopefully in a month or two I'll have some good information. Does that 707B have dual distributors? The issue we're having is that the distributors don't want to turn to be adjusted. Maybe that's not the way to adjust the timing? Correct, dual distributors, and I don’t think they twist to adjust like on a normal car... Quote Who needs a back yard when you could have a Yard?! Link to comment https://www.bigmacktrucks.com/topic/60966-en-707a-service-information/#findComment-442585 Share on other sites More sharing options...
CaptainCrutch Posted February 13, 2020 Share Posted February 13, 2020 I was talking to my dad who had messed with that stuff a long time ago, he told me you basically have to open up the distributors and adjust their linkages, and make sure they’re both exactly the same, in order to adjust the timing. Hope that helps a little more than earlier... Still I’d get your manuals from the Mack Museum to tell you exactly how to adjust yours... Quote Who needs a back yard when you could have a Yard?! Link to comment https://www.bigmacktrucks.com/topic/60966-en-707a-service-information/#findComment-442629 Share on other sites More sharing options...
1958 F.W.D. Posted February 13, 2020 Share Posted February 13, 2020 FireMech I volunteer at the museum. We absolutely have manuals. Please use the "Contact us" on the Museum's sub-section of the corporate website and request a manual. A suitable donation is requested. Thank you!! Quote TWO STROKES ARE FOR GARDEN TOOLS Link to comment https://www.bigmacktrucks.com/topic/60966-en-707a-service-information/#findComment-442653 Share on other sites More sharing options...
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