Macktruckman Posted April 22, 2019 Share Posted April 22, 2019 1980 EM6-285 with Robert Bosch pump. Tachometer cable doesn’t run directly into the engine. It uses a funny little drive adapter that moves the cable over to clear the pump. My Mack dealer hasn’t been any help. The gear broke in the adapter and I need one. Can anyone send me the right direction? thank you Quote Link to comment https://www.bigmacktrucks.com/topic/56849-em6-tachometer-drive-help/ Share on other sites More sharing options...
JoeH Posted April 23, 2019 Share Posted April 23, 2019 Weird. I have a 1981 2 valve endt676 engine sitting on the shelf. Same block, but I don't think it uses that. I'll see if my 1988 em6-300l uses one... Quote Link to comment https://www.bigmacktrucks.com/topic/56849-em6-tachometer-drive-help/#findComment-421167 Share on other sites More sharing options...
theakerstwo Posted April 23, 2019 Share Posted April 23, 2019 The difference is which injection pump it uses. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/56849-em6-tachometer-drive-help/#findComment-421184 Share on other sites More sharing options...
Vladislav Posted April 23, 2019 Share Posted April 23, 2019 (edited) Seems as a pretty common part. At least I saw one in my junk inventory, probably off EM6-285 either. I would ask any big used Mack parts supplier like Matt Pfahl, Global Truck Traders or Sparr on that thing. Too probably it was used by other truck makers of those years but unfortunately I'm not familiar with any other cases. Edited April 23, 2019 by Vladislav Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/56849-em6-tachometer-drive-help/#findComment-421199 Share on other sites More sharing options...
Macktruckman Posted April 24, 2019 Author Share Posted April 24, 2019 Thank you Quote Link to comment https://www.bigmacktrucks.com/topic/56849-em6-tachometer-drive-help/#findComment-421262 Share on other sites More sharing options...
Macktruckman Posted April 24, 2019 Author Share Posted April 24, 2019 This one has a Robert Bosch theres five more r models here of various years and all of them are American Bosch and don’t have this thing. Naturally I have the oddball. Lol Quote Link to comment https://www.bigmacktrucks.com/topic/56849-em6-tachometer-drive-help/#findComment-421263 Share on other sites More sharing options...
JoeH Posted April 24, 2019 Share Posted April 24, 2019 5 hours ago, Macktruckman said: This one has a Robert Bosch theres five more r models here of various years and all of them are American Bosch and don’t have this thing. Naturally I have the oddball. Lol I have some ambacs and I think a Robert Bosch, none have the adapter. Are you sure you need it? Quote Link to comment https://www.bigmacktrucks.com/topic/56849-em6-tachometer-drive-help/#findComment-421285 Share on other sites More sharing options...
br549 Posted April 24, 2019 Share Posted April 24, 2019 That is a 1-1 ratio used to clear the supply pump if I remember correct. You don't need if you can get your tach cable to go in straight. The part # is 119AX5247, not sure if it goes to a volvo world #. Last time I check years ago it was the price of a couple Disney tickets. Our's worked with it. Quote Link to comment https://www.bigmacktrucks.com/topic/56849-em6-tachometer-drive-help/#findComment-421290 Share on other sites More sharing options...
41chevy Posted April 24, 2019 Share Posted April 24, 2019 https://www.ebay.com/p/Mack-Ratio-Adapter-119AX5247/601220894 1 Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/56849-em6-tachometer-drive-help/#findComment-421291 Share on other sites More sharing options...
Macktruckman Posted April 25, 2019 Author Share Posted April 25, 2019 Yeah it’s got to have it. I tried to make it work without it but it just won’t clear enough to start the nut. 41 Chevy that link is what I needed. I ordered it and should have it Tuesday. Thank you sir, if we ever meet up the first couple rounds are on me 2 Quote Link to comment https://www.bigmacktrucks.com/topic/56849-em6-tachometer-drive-help/#findComment-421334 Share on other sites More sharing options...
Macktruckman Posted April 25, 2019 Author Share Posted April 25, 2019 Thank all of you guys for your help. I really appreciate all of you taking the time Quote Link to comment https://www.bigmacktrucks.com/topic/56849-em6-tachometer-drive-help/#findComment-421336 Share on other sites More sharing options...
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