Guy Hopshtein Posted October 28, 2013 Share Posted October 28, 2013 Hi all. I have been reading and reading all over the forum and it is quite a vast wealth of information. My issue: 2002 Mack ch613 with an e7 460. When I use the engine brakes, it slows it down about as much as running over a few deer would. It is fine if I am going down less than 1% grade, but if I am coming down the rockies, forget it. I hope you aren't in front of me, because I am going to run you over. Not cool. Seems to work slightly better when my primary air is over 120,but not great. Until recently, I have not used this truck, and I have driven FLs, Petes, and kws with great Jakes. This one is useless. Next issue, for those who are still reading, is power. This engine has 901k miles on it. I get the fact that it's old and used, but what a dog. 0-60 time is measured in light years (unless I'm going downhill with the engine brakes on). Any suggestions to improve the power would be appreciated. Also, when running loaded and hard through Hills, I seem to need a very active oil well to keep this thing happy with all the oil it burns. Any help is appreciated. Thanks Quote Link to comment Share on other sites More sharing options...
GreenGiant2 Posted October 28, 2013 Share Posted October 28, 2013 going out on a limb, but a friend has the same issue with the e-brake and was told the the oil pressure isn't high enough to work the brake valves in the head. what is your oil pressure @. they told him he needs a high volume oil pump. gg2 Quote We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. Link to comment Share on other sites More sharing options...
theakerstwo Posted October 29, 2013 Share Posted October 29, 2013 The next time you used the engine brake roll the windows up and hold both doors open cause that helps on a mack. Quote glenn akers Link to comment Share on other sites More sharing options...
Guy Hopshtein Posted October 29, 2013 Author Share Posted October 29, 2013 Very funny. Right now, I am coming into California and there is a very steep grade. Having to 4th gear it and use the Johnny bar to keep from blowing up the engine. I'm afraid of jacknifing it, as there will be 10 million homeless bees. My oil pressure is up at 60 right now, still no help. Going to be in olympia WA in 2 days. I will go to tec Mack in Tacoma, unless anyone can recommend somewhere better or more affordable. Thanks Quote Link to comment Share on other sites More sharing options...
br549 Posted October 29, 2013 Share Posted October 29, 2013 Oil presssure to the jake was a problem with them. We put high speed oil pump on ours and it helped, but if I really needed a good Jake I would put a tune up kit in it and install the external oil lines kit that runs oil pressure for gallery on side of block to the jake spacers. It really makes a difference. I have had a few plugs come out of the rocker shaft end plugs & lose oil pressure but usually the jake dont work on that head. Quote Link to comment Share on other sites More sharing options...
Guy Hopshtein Posted October 29, 2013 Author Share Posted October 29, 2013 Where do you get the external kit? Did it help to the point that you felt like you had actual Jakes (like on a cat or cummins), or was it just slightly less likely that you would take out 42 cars on the way down a hill? Quote Link to comment Share on other sites More sharing options...
Guy Hopshtein Posted October 29, 2013 Author Share Posted October 29, 2013 And what is the recommended oil pressure for this engine, low and high. And what should it be when loaded at 80k going down steep Hill? Quote Link to comment Share on other sites More sharing options...
Mackpro Posted October 29, 2013 Share Posted October 29, 2013 The top feed kit seems to work great but best i remember parts and install were around $2000. There were so many updates that were available to upgrade the Jakes that it was confusing on what was what. We usually started with the high voulme oil pump first and see if it helped.top feed.pdf Quote Link to comment Share on other sites More sharing options...
DCR Posted October 29, 2013 Share Posted October 29, 2013 I have a 2000 Vision with a 460 and experienced the same Jake problems. Had Jake rebuild and very little improvement. Added external oil kit and had some improvement but not great. Changed engine oil and added two gallons of Lucas and could not believe the difference. Pennsylvania mountains on I80 I had to brake going down I can now go down without applying brakes. Also saw a 10 lb increase in oil pressure. Quote Denny330-550-6020A "Mack Pack" Charter Member Link to comment Share on other sites More sharing options...
blackdog2 Posted October 29, 2013 Share Posted October 29, 2013 Ive got an 2001 rd radiator was semi plugged lost oil pres . ready to change rods &mains then it would shut down on a long hill . Change radiator got oil pres. back. Quote Ed Link to comment Share on other sites More sharing options...
jzack Posted November 28, 2013 Share Posted November 28, 2013 I have a 2000 Vision with a 460 and experienced the same Jake problems. Had Jake rebuild and very little improvement. Added external oil kit and had some improvement but not great. Changed engine oil and added two gallons of Lucas and could not believe the difference. Pennsylvania mountains on I80 I had to brake going down I can now go down without applying brakes.Also saw a 10 lb increase in oil pressure.The Jake in my Mack has always worked great. I also use 2 gallons of Lucas at every oil change. Quote Link to comment Share on other sites More sharing options...
rsb502 Posted November 28, 2013 Share Posted November 28, 2013 With a pre powerleash brake CCRS engine 01-03 the engine brakes love thick oil and lots of it, the external line kit, high volume oil pump and two or three gallons of Lucas in your oil change will change it by about 50%. If you can tell a big difference in the brake with a cold engine its because of the thicker oil/higher oil pressure. This engine is not a 14+liter Cat or Cummins you have to remember that, your running a 12 liter now, if you get it pulling like the big Cummins and Cat its a bad dude to run like it has 100+ more cubic inches. If that Etech has 901k on it without a rebuild its been an awesome engine, do you know if its been inframed or swapped with a reman engine? The oil use isn't great for power, all that oil is going somewhere and if its not leaking it or putting it in the coolant its burning it which will make less power. Good luck with the truck but as the guys above have said the Jake can be made to do well with a little work, its not that expensive if you can do it yourself either and probably wouldn't hurt to roll in some bearings while the oil pump was getting swapped if its actually got 901k. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
gearhead204 Posted November 28, 2013 Share Posted November 28, 2013 peak you might contact cw grove in kent wash. not to far from Tacoma and talk to wayne kinda a grumpy old boy but no b.s. if he can help he will he knows mack. Quote Link to comment Share on other sites More sharing options...
leweymeister Posted December 13, 2013 Share Posted December 13, 2013 I have a e7-427 in my '96 CH-613. The Jake on it is total crap. Based on this thread, I want to try Lucas in it to help that... I live in Alaska and it gets freaking cold in the winter here. Does the Lucas make the oil super viscous in extreme cold? We run pan heaters and synthetic 5W-40, but at -20 things get awfully sticky. Any info would be welcome. Quote Link to comment Share on other sites More sharing options...
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