rhartl1998ch600 Posted September 11, 2010 Share Posted September 11, 2010 I just started driving a 1998 ch600 with a mack 6 cylinder engine equipped with a two stage engine brake. I believe it is a actual Jacobs engine brake and not a Mack brake the way it behaves. The engine brake would sound like it was missing at higher rpms but would work properly at around 1700 and below. The problem however has gotten worse and it now sometimes doesnt work until below 1600 or even lower. Yesterday when I turned the brake on it did'nt come on at all. I was going down a pretty good size hill so I slowed down using the air brakes and dropped one gear and then was at 1800 rpms and the brake kicked in but was still missing. Almost every truck I have driven since 1979 has had a engine brake but when I told the owner about the problem he said, "dont worry about it, you dont know what you "f"ing talking about. Any help would be appreciated.Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/15678-1998-ch600-engine-brake/ Share on other sites More sharing options...
rhasler Posted September 11, 2010 Share Posted September 11, 2010 I just started driving a 1998 ch600 with a mack 6 cylinder engine equipped with a two stage engine brake. I believe it is a actual Jacobs engine brake and not a Mack brake the way it behaves. The engine brake would sound like it was missing at higher rpms but would work properly at around 1700 and below. The problem however has gotten worse and it now sometimes doesnt work until below 1600 or even lower. Yesterday when I turned the brake on it did'nt come on at all. I was going down a pretty good size hill so I slowed down using the air brakes and dropped one gear and then was at 1800 rpms and the brake kicked in but was still missing. Almost every truck I have driven since 1979 has had a engine brake but when I told the owner about the problem he said, "dont worry about it, you dont know what you "f"ing talking about. Any help would be appreciated.ThanksIs it an E-Tech (with 6 individual fuel pumps) or an E-7 (with a single inline fuel pump)? Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment https://www.bigmacktrucks.com/topic/15678-1998-ch600-engine-brake/#findComment-63397 Share on other sites More sharing options...
rhartl1998ch600 Posted September 11, 2010 Author Share Posted September 11, 2010 Is it an E-Tech (with 6 individual fuel pumps) or an E-7 (with a single inline fuel pump)?Sorry I don't know right of hand and the truck is 10 miles away and I won't be out there for over a week. Quote Link to comment https://www.bigmacktrucks.com/topic/15678-1998-ch600-engine-brake/#findComment-63403 Share on other sites More sharing options...
rhartl1998ch600 Posted September 11, 2010 Author Share Posted September 11, 2010 Is it an E-Tech (with 6 individual fuel pumps) or an E-7 (with a single inline fuel pump)?If it helps, it is a CH600 ELITE set up for over the road with lots of extras including dual exhaust and a eaton 10 speed. Quote Link to comment https://www.bigmacktrucks.com/topic/15678-1998-ch600-engine-brake/#findComment-63405 Share on other sites More sharing options...
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