Supermutt Posted July 13, 2023 Share Posted July 13, 2023 hello, I don’t mean any disrespect to anyone on the site. I am looking for a resident wizard on the E7 350 mechanical fuel system. I have read countless posts on here but they do not get into the specifics of fuel settings etc and many have a lot of folks chiming in with their two cents but actually have very little experience with this specific fuel system. Any help would be greatly appreciated ! thanks Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/ Share on other sites More sharing options...
Mackpro Posted July 13, 2023 Share Posted July 13, 2023 What settings you needing info on ? Robert Bosch pump I assume? Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-534728 Share on other sites More sharing options...
Supermutt Posted July 13, 2023 Author Share Posted July 13, 2023 Turn up or move fuel plate forward. The pump must be American Bosch. It’s a 1996. It must be a P7100 identical to Cummins 12v. Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-534731 Share on other sites More sharing options...
Mackpro Posted July 13, 2023 Share Posted July 13, 2023 It would be a Robert Bosch pump of that era. The easiest way to tell is where you screw your injector line on. The Robert Bosch pump has a extremely fine spline barrel nut that takes a special socket to remove the barrel and replace pump washers. The American Bosch pump was way more low profile where the injector lines screwed on. The fine tuning of the pumps were not done at the dealerships. This was a pump shop type of repair/adjustment. However like some people said I remember removing the top cover marking the position of the sliding rail with a punch and moving it forward and test driving. I’ll see if I have any information on it in my old manuals at work 2 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-534732 Share on other sites More sharing options...
Mackpro Posted July 13, 2023 Share Posted July 13, 2023 (edited) Here a pretty good video if you got time to kill. The John Deer pumps were pretty close to the Mack pumps Edited July 13, 2023 by Mackpro 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-534733 Share on other sites More sharing options...
doubleclutchinweasel Posted July 13, 2023 Share Posted July 13, 2023 You've got one of the best in the business helping you there, 'Mutt! 2 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-534755 Share on other sites More sharing options...
Mackpro Posted July 13, 2023 Share Posted July 13, 2023 Proper pump timing is crucial for best performance. Using a Kent Moore A-B light , set the pump timing 1 degree higher than what the tag on the valve cover . Never more than 1.5 degrees or overheating will probably happen. We rarely ever messed with the pump . Good injectors, turbo, valves adjusted correctly, throttle linkage and kill cable adjusted correctly and the pump timing bumped up usually made a big improvement in power. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-534760 Share on other sites More sharing options...
Popular Post Joey Mack Posted July 13, 2023 Popular Post Share Posted July 13, 2023 This is the timing tool for the Robert Bosch injection pump.. I swear by it.. Jojo 1 2 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-534761 Share on other sites More sharing options...
Supermutt Posted July 14, 2023 Author Share Posted July 14, 2023 Joey I sent you a message. I will have to pick up that timing tool. Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-534795 Share on other sites More sharing options...
Popular Post BOBWhite Posted July 14, 2023 Popular Post Share Posted July 14, 2023 Not really about tuning up but it helped me understand the timing process. Tuning these Macks is kind of a tricky deal, throwing more fuel at it won't do you much good. Mack spent a lot more timing tuning these engines to be used in trucks than anyone else, so anything you modify will likely just throw everything else off balance. Best of luck! 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-534806 Share on other sites More sharing options...
Mackman87 Posted 22 hours ago Share Posted 22 hours ago (edited) On 7/13/2023 at 1:12 PM, Mackpro said: Proper pump timing is crucial for best performance. Using a Kent Moore A-B light , set the pump timing 1 degree higher than what the tag on the valve cover . Never more than 1.5 degrees or overheating will probably happen. We rarely ever messed with the pump . Good injectors, turbo, valves adjusted correctly, throttle linkage and kill cable adjusted correctly and the pump timing bumped up usually made a big improvement in power. So when removing the pump for the truck. I use this light to tell me when the pump sees TDC. Once lights are both on does the pump remove the same way as an e6? (Three bolts holding it to motor). I have heard I have to take front cover off and remove gear before I can unbolt and slide pump out of the housing. Edited 22 hours ago by Mackman87 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572684 Share on other sites More sharing options...
Joey Mack Posted 22 hours ago Share Posted 22 hours ago So you have n E-7. With a Robert Bosch pump. Yes you roll the engine until both lights are lit. If you pass by it, back off 30+ degrees and try again. Then take note of the degree mark on the flywheel. You can also mark the plate on the pump gear just for extra reference. Then remove the pump. Will you be able to leave the crank shaft position alone during the pump work? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572685 Share on other sites More sharing options...
Mackman87 Posted 22 hours ago Share Posted 22 hours ago 1 minute ago, Joey Mack said: So you have n E-7. With a Robert Bosch pump. Yes you roll the engine until both lights are lit. If you pass by it, back off 30+ degrees and try again. Then take note of the degree mark on the flywheel. You can also mark the plate on the pump gear just for extra reference. Then remove the pump. Will you be able to leave the crank shaft position alone during the pump work? That’s correct E7 with Robert Bosch. I will leave crank in the same position until reinstalled. So I do not need to remove front timing cover to remove gear off pump? Just unbolt it from engine housing? Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572686 Share on other sites More sharing options...
Joey Mack Posted 22 hours ago Share Posted 22 hours ago https://photos.app.goo.gl/5MoEkeoYxGCv6ru46 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572688 Share on other sites More sharing options...
Joey Mack Posted 22 hours ago Share Posted 22 hours ago https://photos.app.goo.gl/MSVHiHvkFPsaq1G79 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572689 Share on other sites More sharing options...
Popular Post Joseph Cummings Posted 21 hours ago Popular Post Share Posted 21 hours ago On 7/13/2023 at 2:25 PM, Joey Mack said: This is the timing tool for the Robert Bosch injection pump.. I swear by it.. Jojo You can't flow time that pump? 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572691 Share on other sites More sharing options...
Joey Mack Posted 21 hours ago Share Posted 21 hours ago You have to remove the front cover and the 4 bolts on the pump gear. Leave the gear meshed in the hole. The pump coupler will come out with the pump. When the pump is ready to install. You will use the light timer to make sure the pump is set before installation. then install the pump with 2 bolts secured in the pump gear. Then back it off 30+ degrees, and bring it up til the lights match, and check the degree mark on the flywheel. 1/2 degree early is ok. If it is on the mark, lock it down.. your done... There are a few others here who know this better than me. I expect one to chime in.. jojo 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572692 Share on other sites More sharing options...
Mackman87 Posted 21 hours ago Share Posted 21 hours ago I really appreciate all the info! I can’t find people with the knowledge to do this around me so Im trying to learn myself. also if I wanted to add/remove pump timing I would back the motor off a degree or so according to flywheel with out pump or pump gear on correct? Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572693 Share on other sites More sharing options...
Joey Mack Posted 21 hours ago Share Posted 21 hours ago Yes but you need to move the engine 30+ degrees back then go forward to remove gear lash.. a little gear lash effects a long way... Got it ??? The engine runs clockwise... 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572695 Share on other sites More sharing options...
Mackman87 Posted 21 hours ago Share Posted 21 hours ago 13 minutes ago, Joey Mack said: Yes but you need to move the engine 30+ degrees back then go forward to remove gear lash.. a little gear lash effects a long way... Got it ??? The engine runs clockwise... I gotcha now! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572696 Share on other sites More sharing options...
Joey Mack Posted 21 hours ago Share Posted 21 hours ago 🍻 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572697 Share on other sites More sharing options...
Joey Mack Posted 4 hours ago Share Posted 4 hours ago You will see that the holes in the pump drive gear are slotted. That is so you can make minor degree changes during set up. That is done by leaving 2 opposing bolts in place, and using the other 2 bolt holes to turn the pump without turning the engine. To do that part, the 2 bolts will need to be loosened up a little to allow the pump coupler to rotate. The gear will not move. I will look for a picture of the tool. You can make one... Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572727 Share on other sites More sharing options...
Joey Mack Posted 4 hours ago Share Posted 4 hours ago 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572729 Share on other sites More sharing options...
allfritz123 Posted 4 hours ago Share Posted 4 hours ago (edited) Thanks for all that info. I really enjoyed the YT video posted by BobWhite! You can't beat videos like that for explaining everything that can go wrong. I am getting ready to take my pump off to get the governor weights adjusted. It is a Robert Bosch pump on an E6-300. The engine was only able to rev up to about 1550 rpm. My earlier post from last year: https://www.bigmacktrucks.com/topic/73521-e6-285-2vh-problems-and-solutions/ Someone had it set for "economode". I only have a puff limiter on it and I talked to the diesel shop and they said they can't adjust governed speed without removing the pump as the cover is located next to the block which allows access to the weights and springs. I am trying to figure out how to take it off so that I can give it to them and then put back on later without adjusting anything. The truck is running fine. A question I have for the E6. I find number 1 compression TDC and then back off counterclockwise until I get to port closure at 22 deg BTC after removing gear lash? Is 22 deg the standard and the same for an American Bosch pump? Just want to make sure 22 degress is correct position to leave engine in when removing the pump. If correct, then I can open front cover and remove 4 bolts on the gear and take everything out with the assembly. If I don't use a timing light, don't rotate engine (leave gear in place or mark across the gears for positioning) and mark position of 4 bolts in slots on gear, I should be able to get my pump out and then they return it to me and just put the whole assembly back in? Just want to make sure I get timing right. Hope this is correct! Edited 3 hours ago by allfritz123 grammar Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572731 Share on other sites More sharing options...
Joey Mack Posted 3 hours ago Share Posted 3 hours ago I beleive the pump shop will have to set the timing on the bench. Key is not to rotate the pump when handling it. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73047-e7-350-full-mechanical-bosch-pump/#findComment-572733 Share on other sites More sharing options...
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