rsqman12 Posted 3 hours ago Share Posted 3 hours ago Couldn't find any discussion on this so... I've got a E6 2valve engine. The spec sheet and the plate say it came with a Dynatard. The rear head had been changed at some point prior to my owning it. The head does not have a solenoid or any indication of the parts/pieces for the Dynatard. I have the complete kit, Jacobs Model 675A, that I would like to install. Is this a doable thing, or is this a big headache and/or mistake? I am aware that its a small engine and the performance doesn't compare to other engines, but would still like to know if this can actually be installed and work reliably in this set up. Quote Link to comment https://www.bigmacktrucks.com/topic/74987-jakes-on-a-dynatard-engine/ Share on other sites More sharing options...
mrsmackpaul Posted 3 hours ago Share Posted 3 hours ago There was a thread on this some years ago now Read thru the thread Paul Quote Link to comment https://www.bigmacktrucks.com/topic/74987-jakes-on-a-dynatard-engine/#findComment-566207 Share on other sites More sharing options...
D-Day Posted 2 hours ago Share Posted 2 hours ago I have seen a Dynatard removed and replaced with a Jake brake on a four valve engine I did not do that job so I don't know the details. Quote Link to comment https://www.bigmacktrucks.com/topic/74987-jakes-on-a-dynatard-engine/#findComment-566212 Share on other sites More sharing options...
Joseph Cummings Posted 2 hours ago Share Posted 2 hours ago I can tell you that beginning in about 1980 all 672 cubic inch Mack engines were built with a Dynatard camshaft whether Dynatard equipped or not. I found out the hard way in about 1982. I tried to adjust the valves on one while it was running. You can't do that if the engine has a dynatard cam. It misses and pops and spits and has you scratching your head for a bit. Earlier engines, if you wanted an engine brake, you had to either install a dynatard cam, or use a jake brake 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74987-jakes-on-a-dynatard-engine/#findComment-566214 Share on other sites More sharing options...
Lmackattack Posted 5 minutes ago Share Posted 5 minutes ago from what I can tell in my search to see if my 1977 285 tipturbine was ready for a Mack dynatard or if I had to find a jacobs brand. If you engine was built before 1980 or 82 (cant recall the exact year??) your engine tag needs to read ENDT676"B" for it to have a dynatard cam factory installed. If there is no B in the Engine code you likely do not have the dynatard cam factory installed and you probably need a Jacobs kit instead. I do not know if the jacobs brand kit would work with a dynatard cam. Quote Link to comment https://www.bigmacktrucks.com/topic/74987-jakes-on-a-dynatard-engine/#findComment-566230 Share on other sites More sharing options...
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