luke andres Posted January 15, 2017 Share Posted January 15, 2017 so i swapped transmissions on my 91 dm mack 300 em7 engine there is a air line that went from the mack 2080 transmission up to the intake on the engine where should i tap this air line into on the truck as the eaton fuller 8ll doesnt have a place to put it also what does this air line do Quote Link to comment https://www.bigmacktrucks.com/topic/48369-mysterious-air-line/ Share on other sites More sharing options...
theakerstwo Posted January 15, 2017 Share Posted January 15, 2017 (edited) Put it in the air tank supply or on the parking brake valve.Its the supply line to the reverse relay valve the puff limiter.If you dont connect it up the puff limiter will not work and it will smoke on gear chains or taking off. Edited January 15, 2017 by theakerstwo Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/48369-mysterious-air-line/#findComment-358448 Share on other sites More sharing options...
luke andres Posted January 15, 2017 Author Share Posted January 15, 2017 thanks for the info so as llong as it has air going to it it should be fine Quote Link to comment https://www.bigmacktrucks.com/topic/48369-mysterious-air-line/#findComment-358449 Share on other sites More sharing options...
theakerstwo Posted January 15, 2017 Share Posted January 15, 2017 yes Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/48369-mysterious-air-line/#findComment-358477 Share on other sites More sharing options...
turckster Posted January 21, 2017 Share Posted January 21, 2017 On 1/14/2017 at 9:39 PM, luke andres said: so i swapped transmissions on my 91 dm mack 300 em7 engine there is a air line that went from the mack 2080 transmission up to the intake on the engine where should i tap this air line into on the truck as the eaton fuller 8ll doesnt have a place to put it also what does this air line do As far as I remember E7 engines did not have bimba valves, they had lda valves on the back on the injection pump. The air line that went to the t2080 trans was a manifold psi dump. When the trans was in reverse or low gear(s?) the valve would dump manifold boost to protect the driveline from damage. I'm not sure how they were plumbed on vendor transmissions or if they were there at all. I would remove the line and fitting and install a plug in the manifold. Quote Link to comment https://www.bigmacktrucks.com/topic/48369-mysterious-air-line/#findComment-359212 Share on other sites More sharing options...
steve p Posted January 21, 2017 Share Posted January 21, 2017 torque limiter valve is what your thinking of 2 Quote Link to comment https://www.bigmacktrucks.com/topic/48369-mysterious-air-line/#findComment-359222 Share on other sites More sharing options...
luke andres Posted January 24, 2017 Author Share Posted January 24, 2017 so now im confused do i plug off the air line or do i supply it with air? and yes it does go from the 2080 transmission to the engine manifold Quote Link to comment https://www.bigmacktrucks.com/topic/48369-mysterious-air-line/#findComment-359589 Share on other sites More sharing options...
turckster Posted January 26, 2017 Share Posted January 26, 2017 On 1/23/2017 at 8:47 PM, luke andres said: so now im confused do i plug off the air line or do i supply it with air? and yes it does go from the 2080 transmission to the engine manifold I'd plug it. Like I stated above, it's main purpose was to limit torque in revers and low gear. Quote Link to comment https://www.bigmacktrucks.com/topic/48369-mysterious-air-line/#findComment-359781 Share on other sites More sharing options...
theakerstwo Posted January 26, 2017 Share Posted January 26, 2017 The line going to the valve on the intake needs air. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/48369-mysterious-air-line/#findComment-359821 Share on other sites More sharing options...
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