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Rawze · 02-02-2021, **(Subject: Is it mandatory for a 5 inch pound torque wrench )**

(02-01-2021 )90petercar Wrote: I'm trying to set the whole overhead..valves injectors and jake..its on a cm 570 signature 600. My Jake doesn't seem to want to work on the low setting unless its right at 1500 rpm

The turbocharger is what sets the engine brake strength. Make sure the CAC and intake/air-system are not leaky, make sure the Air filter for the engine is clean, and make sure the exhaust system / muffler does not have restrictions or have too much soot impacting them. Mufflers do go bad and get soot/carbon packed after any hundreds of thousands of miles of use.

Also make sure the (assuming you still have the correct factory Holset turbo on it and it is all still intact) Waste-gate is set correctly according to QSOL and that the program in the ecm matches the engine ser#.

Just a word for reference: You should not see more than about 28~ish-PSI or so on the turbo with the jakes on high and high rpm's under maximum engine jake loads. Much higher than this and you start risking the engine to drop a valve under extreme jake conditions. If the jake is not strong enough for you with it set correctly like this .. then LEARN HOW TO DRIVE THE DAMNED TRUCK IN THE RIGHT GEARING when going down a hill instead of trying to get more out of a jake brake that is already literally the strongest of any other brand of engine out there in its classification.

What your describing does not sound like there is a problem. The CM570 jake brakes are not going to be as strong as newer engines with VGT turbochargers on them in lower RPM ranges, simply because that engine has no control of the "air" and it is typical that the engine brake not reach its strongest ability until the turbo is spinning fast and the RPM is up in the 1500 range like you describe. - If You want a stronger engine brake at lower RPM's then you should have chosen a truck with a more modern engine with an electronic VG turbo that can close its vanes and make pressure for the jakes at far lower rpm ranges.