mackone Posted January 23, 2023 Share Posted January 23, 2023 (edited) Can a Dynatard be installed if engine didn't come out with one? Edited January 25, 2023 by mackone Error Quote Link to comment Share on other sites More sharing options...
Freightrain Posted January 26, 2023 Share Posted January 26, 2023 They aren't exactly like a Jake, so there is more to it. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
mackone Posted January 27, 2023 Author Share Posted January 27, 2023 O.K I was thinking about putting a EM6 300L in my R model and I didn't know if the dynatard from my E6 350 would work on it. Quote Link to comment Share on other sites More sharing options...
Freightrain Posted January 27, 2023 Share Posted January 27, 2023 Beyond my knowledge, sorry. Hope someone else sees this post and can give you more information. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
terry Posted January 27, 2023 Share Posted January 27, 2023 (edited) I do believe you have to have a Dynatard cam for a Dynatard brake setup. Terry Edited January 27, 2023 by terry 1 Quote Link to comment Share on other sites More sharing options...
BOBWhite Posted January 27, 2023 Share Posted January 27, 2023 I believe he is correct ^ Dynatard specific cam, beefier push rods, and different rocker arms and shaft. Theres probably more things like oil passages that aren't there on non dynatard engines that I wouldn't know about. 1 Quote Link to comment Share on other sites More sharing options...
Full Floater Posted January 27, 2023 Share Posted January 27, 2023 On the engine tag, does it say "B" in the engine family category? I do believe there are some B engines, that simply didn't come with the actual retarder as maybe they were not speced out to have a retarder by the purchaser. I have a 237 engine family B, that doesn't have the Dynatard. But as far as I know, I could install one if I wanted to. Quote Link to comment Share on other sites More sharing options...
mackone Posted January 28, 2023 Author Share Posted January 28, 2023 O.K. Thanks everyone for the fast replies, I'll check the engine tag and see if it has a B on the tag in the engine family. 1 Quote Link to comment Share on other sites More sharing options...
mackone Posted February 8, 2023 Author Share Posted February 8, 2023 I can't even find the B code on my E6 350 and it has a Dynatard , unless I'm looking in wrong place. would the code be somewhere besides the tag? Quote Link to comment Share on other sites More sharing options...
Full Floater Posted February 8, 2023 Share Posted February 8, 2023 You're probably looking at the right tag, passenger side of the engine kind of behind and above the injection pump. I also have a "newer" (1983) EM-6 that doesn't have the engine "family" category on the tag. That category MIGHT be a thing only on earlier engines. All my pre 1977 engines have that. And the B family apparently are Dynatard engines. That's not to say that yours is not compatible....just I don't know how to identify it further. Maybe someone knows what to look for under the valve covers/valve train Quote Link to comment Share on other sites More sharing options...
mechohaulic Posted February 8, 2023 Share Posted February 8, 2023 the jacobs engine brake would be an add on unit. a dynatard is built in unit. as other text have written major components would need to be changed. push rods, rockers, cam, (valve covers?). another forum discussed this topic some time back, can't find it. I go back to the beginning of the dynatard which had larger adjusting solenoids on exhaust side . from what i gather the covers are different today. Quote Link to comment Share on other sites More sharing options...
mackone Posted February 16, 2023 Author Share Posted February 16, 2023 O.K., So is there any way to tell from looking at anything under the valve covers if it would have the right cam for Dynatard? Engine is a 1989 EM6 300L 4 valve . Quote Link to comment Share on other sites More sharing options...
MACKS Posted February 16, 2023 Share Posted February 16, 2023 Dynatard brakes are pretty useless in my opinion,jake is the way to go if u can.. 1 Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted February 16, 2023 Share Posted February 16, 2023 So from what I have been able to learn and opinions of myself and others On a E6 there isnt a lot of difference between Dynatard and Jacobs It's a small motor so the compression isn't as good to help slow you That been said, I know of people (very few) that tell me Dynatard works as good or almost as good as a 14 litre Cummins with Jacob brake when the Dynatard is working as it should My experience is that Dynatard is only good for dropping revs quick for changing gears However this really doesn't answer your questions at all So I reckon a piece of wire pushed down from top of the head and measure from the top of the lobe, the rotate the motor until the lobe is on the bottom and measure again should give you a good idea what cam shaft you have Yes this is very farmerish or perhaps in Yanky terms (red neck) but it should give you a idea of what have Paul 2 Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted February 16, 2023 Share Posted February 16, 2023 By now everyone will know and be shaking their head thatyou cant push a piece of wire down to the cam Your a dick Paul Anyway everyone must be feeling generous as no one has called me out on this How ever, Im sure there must a easy way of checking what cam is in there, it's just I am not smart enough to check this Sorry for the bum steer Very little sleep over the last 24 hours and it's hot as all get out, only excuses I have except for Im a dumb ass 🤔 Paul 1 Quote Link to comment Share on other sites More sharing options...
fjh Posted February 17, 2023 Share Posted February 17, 2023 The only way I can think of is with a dial indicator on the exhaust push rod or rocker aad check for the dynatard bump on the back side of the cam! 1 Quote Link to comment Share on other sites More sharing options...
mechohaulic Posted February 17, 2023 Share Posted February 17, 2023 early dyna versions the exhaust valve was extremely loose until it was brought up to TDC . is it possible to know internal components by removing valve covers / checking valves ??? Quote Link to comment Share on other sites More sharing options...
mackone Posted February 17, 2023 Author Share Posted February 17, 2023 O.K. Thanks everyone for the quick replies, the only reason I was wanting to use dynatard is because I have one on the e6 that spun a bearing, and I heard its hard to find a Jake brake for a E6. Have heard someone mentioned that in later years all mack engines had the dynatard cam regardless whether one was installed or not, but don't know if that is so. Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted February 17, 2023 Share Posted February 17, 2023 4 hours ago, fjh said: The only way I can think of is with a dial indicator on the exhaust push rod or rocker aad check for the dynatard bump on the back side of the cam! Would it be possible for someone smarter than me to draw a picture of what the cam lobes look like on a Dynatard motor Someone may have a good photo, I really have no idea at all about this stuff Paul Quote Link to comment Share on other sites More sharing options...
MACKS Posted February 17, 2023 Share Posted February 17, 2023 I guess if the cam is for a dynadard a jake won’t even work,is that correct? Quote Link to comment Share on other sites More sharing options...
fjh Posted February 17, 2023 Share Posted February 17, 2023 12 hours ago, mackone said: O.K. Thanks everyone for the quick replies, the only reason I was wanting to use dynatard is because I have one on the e6 that spun a bearing, and I heard its hard to find a Jake brake for a E6. Have heard someone mentioned that in later years all mack engines had the dynatard cam regardless whether one was installed or not, but don't know if that is so. That is very possible I heard the same as you but never confirmed it! Chances are your engine has the Dynatard cam and all you need is the push tubes and rocker gear to make it work And wiring of coarse ! If you have a donor engine you could swap the rockers and push tubes and see what happens! if you want to invest the time! Just sayin! Quote Link to comment Share on other sites More sharing options...
mackone Posted February 17, 2023 Author Share Posted February 17, 2023 6 minutes ago, fjh said: That is very possible I heard the same as you but never confirmed it! Chances are your engine has the Dynatard cam and all you need is the push tubes and rocker gear to make it work And wiring of coarse ! If you have a donor engine you could swap the rockers and push tubes and see what happens! if you want to invest the time! Just sayin! O.K I Have the other complete engine that I was using everyday up until October when it spun a bearing or something, So I have everything , so I guess I could see if it will work, I am just trying to keep from having someone change camshafts if possible. Quote Link to comment Share on other sites More sharing options...
mechohaulic Posted February 17, 2023 Share Posted February 17, 2023 how bad was damage on the spun a bearing engine? repair to 350 with engine brake not a more feasible idea VS change-over to a 300 possibly unable to have engine brake ??? repair a bearing spin instead of camshaft change. Quote Link to comment Share on other sites More sharing options...
fjh Posted February 17, 2023 Share Posted February 17, 2023 2 hours ago, mechohaulic said: how bad was damage on the spun a bearing engine? repair to 350 with engine brake not a more feasible idea VS change-over to a 300 possibly unable to have engine brake ??? repair a bearing spin instead of camshaft change. I think if he has the time swap the bits over wouldn’t take more than 6 hrs and if it doesn’t work he still has a running engine don’t have to swap back!just leave it!the valve set is the same 16/24 just sayin 1 Quote Link to comment Share on other sites More sharing options...
D-Day Posted February 17, 2023 Share Posted February 17, 2023 15 hours ago, mrsmackpaul said: Would it be possible for someone smarter than me to draw a picture of what the cam lobes look like on a Dynatard motor Someone may have a good photo, I really have no idea at all about this stuff Paul 1 1 Quote Link to comment Share on other sites More sharing options...
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