Joey Mack Posted March 24, 2022 Share Posted March 24, 2022 did you you do the test at the plugs on the spacers? if you did the test, im leaning towards the relay, like Onyx said earlier.. I dont remember which one it is... jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493126 Share on other sites More sharing options...
tractor Posted March 24, 2022 Share Posted March 24, 2022 ok got power wires broke where sombody probed them green got in solenonds click but oil comes out top Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493169 Share on other sites More sharing options...
tractor Posted March 24, 2022 Share Posted March 24, 2022 when they have power is that normal thanks Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493170 Share on other sites More sharing options...
Joey Mack Posted March 24, 2022 Share Posted March 24, 2022 they will squirt oil, you werent leaning over the engine while someone 'stabbed' the throttle, were you? jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493171 Share on other sites More sharing options...
tractor Posted March 24, 2022 Share Posted March 24, 2022 not leaning over engine thanks but barly working some times no jake Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493172 Share on other sites More sharing options...
Joey Mack Posted March 24, 2022 Share Posted March 24, 2022 how many times did you rev it up and let off? it may take a few tries, the real deal is when you drive it,, hopefully it will pump up with-in a 1/4 mile of engine breaking. those Jacobs engine brakes suck anyway.. there have been several updates, . do you have small steel braided oil lines going to the spacers? Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493174 Share on other sites More sharing options...
tractor Posted March 24, 2022 Share Posted March 24, 2022 under the jake casting selenond above it oil comes out about as round as a pencil thanks Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493175 Share on other sites More sharing options...
tractor Posted March 24, 2022 Share Posted March 24, 2022 jake is a model 690 part number 021433 mack number 757gb58b Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493176 Share on other sites More sharing options...
Joey Mack Posted March 24, 2022 Share Posted March 24, 2022 i wish i could see it... my other question, was about small braided oil lines going through the spacer to the top of the engine brake housing. any way.... oil will squirt from the top of the celenoids,, if it is coming out anywhere else, that will cause poor performance. if you have a leak, get the oring packs and replace them. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493177 Share on other sites More sharing options...
tractor Posted March 24, 2022 Share Posted March 24, 2022 the oil comes out hold on casting under selen0nd not top now and no braded lines Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493179 Share on other sites More sharing options...
Onyx610 Posted March 24, 2022 Share Posted March 24, 2022 He was asking that because there was an update for more oil flow to make them work a little better. If you had the line you had the update. Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493180 Share on other sites More sharing options...
Joey Mack Posted March 24, 2022 Share Posted March 24, 2022 ok. the update was not done.. if oil is squirting out around the bottom of the celenoid, it sounds like they are loose and or the orings failed.. jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493181 Share on other sites More sharing options...
Joey Mack Posted March 24, 2022 Share Posted March 24, 2022 grab a 3/4" wrench and remove one of the celenoids.. there should be a green oring around it and a smaller white one, in the base, both are square cut o-rings.. replace those and test it again.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493182 Share on other sites More sharing options...
Onyx610 Posted March 24, 2022 Share Posted March 24, 2022 https://www.bigmacktrucks.com/applications/core/interface/file/attachment.php?id=127406&key=e2c59db5a11bfd0e1983c492d8551f62 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493183 Share on other sites More sharing options...
tractor Posted March 24, 2022 Share Posted March 24, 2022 not bottom of solenoid straight under solenoid in casting put finger under casting hole goes up to solenoid thanks Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493184 Share on other sites More sharing options...
Joey Mack Posted March 24, 2022 Share Posted March 24, 2022 ok.. i understand better.. that is normal. when looking at the tops of the celenoids, do you see the little round pin sticking up out of the hole, ever so slightly? both should look that way. if not, the celenoid is weak. also when you jump power to them they should click pretty firmly,, you can come of the alternator with a wire and 2 alligator clips to make a tester.. in one of the pictures, there is a 90 degree fitting in the jake head,, that is part of the performance update that is NOT done to yours.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493186 Share on other sites More sharing options...
tractor Posted March 24, 2022 Share Posted March 24, 2022 solenond clicks hard pin moves orings are rough not broken sent for 4 new ones from mack Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493193 Share on other sites More sharing options...
tractor Posted March 24, 2022 Share Posted March 24, 2022 a e7-400 lost power used to be 35 psi trubo now 32 what should we check still revs about the same butunder load lose one gear that didnt have to shift before Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493194 Share on other sites More sharing options...
Joey Mack Posted March 24, 2022 Share Posted March 24, 2022 cac leaks, top right corner is common. intake gaskets can fail, air compressor intake can fail, major exhaust manifold leaks... just to name a few,,, jojo Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493203 Share on other sites More sharing options...
tractor Posted March 25, 2022 Share Posted March 25, 2022 cac not leaking air intake not leaking air compressor you talking about line feeds compressor thanks Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493282 Share on other sites More sharing options...
tractor Posted March 25, 2022 Share Posted March 25, 2022 air temp sensor is off on ohms and computer getting new one the screws to adjust how tight truck turns are stuck any way to solve this thanks Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493283 Share on other sites More sharing options...
Joey Mack Posted March 25, 2022 Share Posted March 25, 2022 yes, the line going to the side of the compressor head. it may go to the intake manifold to get it air supply.. Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493289 Share on other sites More sharing options...
tractor Posted March 31, 2022 Share Posted March 31, 2022 on a mack rb688s with a e7-400 engine where is engine shut down buzzer 1998 code sid 238 fmi 04 thanks Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493991 Share on other sites More sharing options...
tractor Posted March 31, 2022 Share Posted March 31, 2022 also code pid 100 fmi 04 Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493992 Share on other sites More sharing options...
Joey Mack Posted March 31, 2022 Share Posted March 31, 2022 the multi buzzer is under the left corner of the dash in front of the clutch pedal.. there is a triangular brace with a about a 2" hole in it. the buzzer is bolted behind it.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/20649-adding-a-jake-brake-to-an-e-tech/page/2/#findComment-493995 Share on other sites More sharing options...
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