Have been browsing these forums for years with different trucks but finally joined just today in order to ask specific questions.
So...I recently purchased an 09 T660 with the ISX engine. 1.3M on the odo and 450k on the overhaul. My problem is that it loses air as soon as the engine is shut off. Sometimes as quickly as 50psi in the first 15min. The leveling valve leaked some, so I replaced that hoping to solve the problem but no luck.
Any ideas (please don't say compressor) would help. I'm not a certified mechanic, but have been known to be handy with a set of wrenches.
09 T660 Air leaks as soon as I shut the engine off.
Discussion in 'Kenworth Forum' started by HoneyBadger67, Dec 15, 2018.
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air bag is my first guess go around all air fittings and find the leak ..... unhook the red trailer line to eliminate the trailer. ... check the "spaghetti " on the fire wall those are hard to hear for some reason
HoneyBadger67 Thanks this. -
Probably now not the best time for spray bottle with soapy water but
Identify where most leaks are, Primary or secondary. Spray all quick connectors with soapy water and fix everything leaking.ducnut, Midwest Trucker and HoneyBadger67 Thank this. -
At least neither of you said compressor....
Hoping for a warm weather run soon, at which time I'll be spraying down every fitting. -
50 PSI in 15 minutes you're definitely going to hear that leak.
201, Midwest Trucker and stwik Thank this. -
It turned out to be the turbo actuator controller box that is mounted under the compressor.
It was leaking internally back into the turbo so you couldn’t hear it or see it bubbling with soapy water.
To see if this is your culprit, find the line from it that goes back to your air drier and block it off.Build up pressure and then turn engine of and see if your pressure drops.
By the way Cummins calls this their little money maker. It cost over 700.00 four years ago.Last edited: Dec 15, 2018
Snailexpress and HoneyBadger67 Thank this. -
Likes been mentioned soapy water and a close ear and you’ll find it.
HoneyBadger67 Thanks this. -
Midwest Trucker and HoneyBadger67 Thank this.
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I thought it might be suspension, which is why I replaced the leveler. I leaks aren't audible with bags dumped. Cant really hear any leaks at all. If it's the turbo actuator, is that something a person who isn't too awfully bright can replace?
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