BronsonA2150 Posted Friday at 05:53 PM Share Posted Friday at 05:53 PM My 94 e7 has an engine brake, but I’m not sure if it’s Jacob’s, dynatard or something else if there is anything else. How do I tell? I don’t see Jacob’s anywhere on the housing like my Cat has Quote Link to comment https://www.bigmacktrucks.com/topic/75063-what-engine-brake-do-i-have/ Share on other sites More sharing options...
Freightrain Posted Friday at 06:16 PM Share Posted Friday at 06:16 PM I would assume Jacob would still have the valve cover spacer to make room. I thought dynatard was internal and wouldn't need the spacer. My .02 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/75063-what-engine-brake-do-i-have/#findComment-567568 Share on other sites More sharing options...
tjc transport Posted Friday at 07:03 PM Share Posted Friday at 07:03 PM if the engine tries to shut off at idle with engine brake on, it is a Jacobs. if the engine brake shuts off at idle on it's own with switch still on, it is a dynatard 1 Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/75063-what-engine-brake-do-i-have/#findComment-567582 Share on other sites More sharing options...
BronsonA2150 Posted Friday at 07:24 PM Author Share Posted Friday at 07:24 PM 19 minutes ago, tjc transport said: if the engine tries to shut off at idle with engine brake on, it is a Jacobs. if the engine brake shuts off at idle on it's own with switch still on, it is a dynatard You sure about that? Mine has electronic throttle so I figured anything would be wired through computer to shut off with rpm, throttle, etc. Quote Link to comment https://www.bigmacktrucks.com/topic/75063-what-engine-brake-do-i-have/#findComment-567589 Share on other sites More sharing options...
fjh Posted Friday at 07:49 PM Share Posted Friday at 07:49 PM 23 minutes ago, BronsonA2150 said: You sure about that? Mine has electronic throttle so I figured anything would be wired through computer to shut off with rpm, throttle, etc. Look at the engine if there is a 2 inch spacer between the valve cover and the head its a jake! Quote Link to comment https://www.bigmacktrucks.com/topic/75063-what-engine-brake-do-i-have/#findComment-567595 Share on other sites More sharing options...
Joey Mack Posted Friday at 07:55 PM Share Posted Friday at 07:55 PM I bet its Jacobs 680 Quote Link to comment https://www.bigmacktrucks.com/topic/75063-what-engine-brake-do-i-have/#findComment-567598 Share on other sites More sharing options...
BronsonA2150 Posted Friday at 08:08 PM Author Share Posted Friday at 08:08 PM 19 minutes ago, fjh said: Look at the engine if there is a 2 inch spacer between the valve cover and the head its a jake! Appears to be! Quote Link to comment https://www.bigmacktrucks.com/topic/75063-what-engine-brake-do-i-have/#findComment-567600 Share on other sites More sharing options...
Joey Mack Posted Friday at 08:34 PM Share Posted Friday at 08:34 PM Jacobs 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75063-what-engine-brake-do-i-have/#findComment-567602 Share on other sites More sharing options...
The Heinz Posted Friday at 08:35 PM Share Posted Friday at 08:35 PM It'll be a 680, possibly a 680B. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75063-what-engine-brake-do-i-have/#findComment-567604 Share on other sites More sharing options...
tjc transport Posted Friday at 10:45 PM Share Posted Friday at 10:45 PM 3 hours ago, BronsonA2150 said: You sure about that? Mine has electronic throttle so I figured anything would be wired through computer to shut off with rpm, throttle, etc. sorry, i missed the 94 year in your post. i was referring to mechanical engines. Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/75063-what-engine-brake-do-i-have/#findComment-567625 Share on other sites More sharing options...
BronsonA2150 Posted Friday at 10:53 PM Author Share Posted Friday at 10:53 PM 2 hours ago, The Heinz said: It'll be a 680, possibly a 680B. Either one of those work better than the other? Quote Link to comment https://www.bigmacktrucks.com/topic/75063-what-engine-brake-do-i-have/#findComment-567626 Share on other sites More sharing options...
fjh Posted yesterday at 01:02 PM Share Posted yesterday at 01:02 PM nope its crap shoot if they work better or not! Oil pressure was an alleged problem with these ! They added an external oil line kit sort of helped! But problem being were only cracking one valve open ! Again not getting rid of all the compression needed for good braking ! Just my opinion! Quote Link to comment https://www.bigmacktrucks.com/topic/75063-what-engine-brake-do-i-have/#findComment-567647 Share on other sites More sharing options...
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