Onyx610 Posted April 5, 2022 Share Posted April 5, 2022 8 minutes ago, mechohaulic said: once again never too old to learn new. have installed jakes; even trip to factory here in CT yrs ago when they were made here. question JOJO ; the braided line, is that how units are oil fed today;; no more o-ring fitting coming from underside? Did you read that service bulletin? Pretty cool huh? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494478 Share on other sites More sharing options...
mechohaulic Posted April 5, 2022 Share Posted April 5, 2022 that's where confusion came about. unit looked familiar to what i remember, the pic with 90 degree fitting is different. Thanks for reply/ update. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494479 Share on other sites More sharing options...
Joey Mack Posted April 5, 2022 Share Posted April 5, 2022 the "Top oil feed" update came in around 2001 or so.. It was for the 690 Jacobs heads.. the heads were dissasembled, then a drilling 'jig' was placed on top left of the middle if i rember correctly,. you were to drill into the jake head about a 1/4" into the oil gallery, but not through it. you know... then tap threads in it to accept a 90 degree #4 JIC fitting. the jake spacers were replacedwith spacers that had #4 JIC bulk head connectors built in.. the jake heads were the flushed out ot get the filings out, and new reset screws were installed, you also flipped it over and 'picked out ' 5 pieces from the oiler port in the bottom of the head. it was a retainer, spring, BB, oring, and something else i forgot.. then the little allen headed delivery valve in the rocker shaft was replaced with a 10mm hex head check valve.. i think we also replace the pistons and springs and washers and snaprings int the jake heads.. we aslo replaced the reset screws in the exhaust rockers with a kit called. 215SB321 with the new armolly screws.. I forget the measurement, anyway, one issue there was that the reset pins would mash into the reset screw which I beleive caused the engine brake to not open the exhaust valve enough to funtion right.. the oil lines we speak of, were SS braide lines. at the oil filter pad we added a fitting to the turbo oil feed port, and ran lines up to the jake spacers to supply higher oil pressure to the jake heads... it worked, but was still not that good... it only got better, when Mack went back to making their own engine brake, and so the "Powerleash" was born .. jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494480 Share on other sites More sharing options...
Joey Mack Posted April 5, 2022 Share Posted April 5, 2022 (edited) My post is only based off of my memory of when I did these updates many years ago,, there is a chance I left something out. I did not re-read the bulliten before posting... Jojo Edited April 5, 2022 by Joey Mack Poor spelling Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494482 Share on other sites More sharing options...
Joey Mack Posted April 5, 2022 Share Posted April 5, 2022 dang-it... i forgot,,, Engine brake lash was originally .015",,, then they went to .017",,,, and after the reset screw update along with the other stuff, lash was set at .021", we also stamped the data plate on the jake head with a 'B' or a 'C' after each update, and the plate on the front valve cover was stamped wit the 'new' eng. brk lash as well.. dammit,,, its flowing back into my head.. jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494483 Share on other sites More sharing options...
mechohaulic Posted April 5, 2022 Share Posted April 5, 2022 just signed out and saw your post;; had to sign back in to thank you for update. now i can sleep tonight ;LOL. couldn't remember how the jake got oil supply. forgot the o-ring fitting went top of rocker assembly. back in the day joke was "made in japan"-junk.. after day of class at jacobs engine brake and seeing how the Japanese new owners saved the jake operation i was impressed. old way was spend day making hundreds of units. then check them. one bad they were all bad and thrown out. new owners had random pulls from assembly line. bad one found stop the line and make corrections. Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494484 Share on other sites More sharing options...
Joey Mack Posted April 5, 2022 Share Posted April 5, 2022 I guess I was in the moment.. sorry about the lengthy posts,, I just couldnt stop typing... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494485 Share on other sites More sharing options...
mechohaulic Posted April 5, 2022 Share Posted April 5, 2022 can remember when mack came out with the dynatard; what a joke / pain in ass. changed more exhaust push rods then i want to count. mack started out using both original in/ ex push rods. the pressure on exhaust rods so bad it was bending them. mack went to solid exhaust rods finally. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494489 Share on other sites More sharing options...
Joey Mack Posted April 5, 2022 Share Posted April 5, 2022 I have an E-6 2 valve in my shop as well, an ENDT673.. I need to get back on it, after i finish the 2 other engines I have on stands. what should I look for in the push rods? they are all the same, the rod is narrower than the ball and seat ends.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494491 Share on other sites More sharing options...
mechohaulic Posted April 5, 2022 Share Posted April 5, 2022 3 minutes ago, Joey Mack said: I guess I was in the moment.. sorry about the lengthy posts,, I just couldnt stop typing... jojo worked for me. wife ranting on about me on here; so i read your post REAL slow. LOL. besides i found it very interesting . how some updates are done has been know to be challenging. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494492 Share on other sites More sharing options...
mechohaulic Posted April 5, 2022 Share Posted April 5, 2022 2 minutes ago, Joey Mack said: I have an E-6 2 valve in my shop as well, an ENDT673.. I need to get back on it, after i finish the 2 other engines I have on stands. what should I look for in the push rods? they are all the same, the rod is narrower than the ball and seat ends.. jojo by now everything has been changed. the intake are regular hollow tubes , exhaust push rods are 3 times heavier due to they are "solid" rods made to take pressure. there is the possibility with all the new computerize technology they don't use heavier rods. my statements are based on when fred flintstone built things and i worked for him;;😁 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494493 Share on other sites More sharing options...
JoeH Posted April 5, 2022 Share Posted April 5, 2022 8 hours ago, Joey Mack said: I have an E-6 2 valve in my shop as well, an ENDT673.. I need to get back on it, after i finish the 2 other engines I have on stands. what should I look for in the push rods? they are all the same, the rod is narrower than the ball and seat ends.. jojo I'm just popping in to this thread, haven't been following. Sometimes the spot welds fail on these pushrods and the end inserts (ball and cup ends) are loose. I've seen a couple that way on our endt676 engines. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494498 Share on other sites More sharing options...
tractor Posted April 5, 2022 Share Posted April 5, 2022 9 hours ago, Onyx610 said: Check fuel pressure too. These ones were also notorious for gear spin on the shaft of fuel pump. what pressure should it have thanks Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494499 Share on other sites More sharing options...
Joey Mack Posted April 5, 2022 Share Posted April 5, 2022 60-100 psi.. Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494500 Share on other sites More sharing options...
Onyx610 Posted April 5, 2022 Share Posted April 5, 2022 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494505 Share on other sites More sharing options...
Onyx610 Posted April 5, 2022 Share Posted April 5, 2022 You can check where the light is shining on the pipe plug. Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494506 Share on other sites More sharing options...
tractor Posted April 5, 2022 Share Posted April 5, 2022 thanks all Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494509 Share on other sites More sharing options...
tractor Posted April 6, 2022 Share Posted April 6, 2022 fuel pressure 90 psi 1 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494622 Share on other sites More sharing options...
tractor Posted April 6, 2022 Share Posted April 6, 2022 no air leaks turbo is tight power is light problem started slow than never got worse thanks Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494623 Share on other sites More sharing options...
tractor Posted April 6, 2022 Share Posted April 6, 2022 code 238 fmi 4 plus code pid 100 fmi 4 and thats all codes, light does not come on only for a second at start up thanks Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494624 Share on other sites More sharing options...
tractor Posted April 6, 2022 Share Posted April 6, 2022 On 4/4/2022 at 10:27 PM, Onyx610 said: When you say “air to air” is that just the CAC? If so you have only checked half of the charge air system. Turbo could be getting worn, boost leaks at turbo/before CAC, or boost leaks after CAC/at intake manifold. checked all that seams ok Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494625 Share on other sites More sharing options...
tractor Posted April 6, 2022 Share Posted April 6, 2022 is their any place that plups onfuel supply like a n14 cummins Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494626 Share on other sites More sharing options...
Onyx610 Posted April 6, 2022 Share Posted April 6, 2022 51 minutes ago, tractor said: is their any place that plups onfuel supply like a n14 cummins ? Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494628 Share on other sites More sharing options...
Onyx610 Posted April 6, 2022 Share Posted April 6, 2022 (edited) Exhaust leaks? Also did you check fuel pressure under load? Edited April 6, 2022 by Onyx610 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494629 Share on other sites More sharing options...
tractor Posted April 6, 2022 Share Posted April 6, 2022 exhaust leaks we checked fuel pressure under load no didn,t check Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/4/#findComment-494630 Share on other sites More sharing options...
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