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Truck Repair/Re N14 Accessory Drive Shaft Braking

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Question
Hi, I am having problems with the accessory drive shaft braking on my N14 It broke 4 Times last 3 times it was braking on the compressor side and last night it broke on the pulley side, I replaced it myself 2 times and had my mechanic replace it last time, We checked the bush bearing in the front cover seamed OK and also compressor turns OK we changed the dampened on the crankshaft that seamed to help a little bit I got about 3oookm more out this last one (3 or 4 trips and it breaks approx 4oookm) but now its braking behind the pulleys, WE have also replaced o rings on the compressor.

Each time we replaced the whole Accessory Drive assembly.
Also I have noticed that sometimes when the engine is idling the compressor instead of having even taking noise it sort of goes like tttt____tttt____  

If you could let me know thanks

Answer
The cheapest way to start is pull your timing cover and pull your pan and valve covers. I would start rolling the motor by hand feeling for anything out of the ordinary and checking everything over. Has to be something bad somewhere else to cause it to vibrate and break. Are you replacing with a factory part or aftermarket if aftermarket would try using factory part. As for the compressor sounds like maybe a valve is letting air past it wouldn't hurt to change your compressor to cure the sound and to also see if something internal on the compressor isn't causing you shaft breakage either. More I think about it if I come up with something else i'll let you know but for now I think you just need to start pulling covers and checking everything out.  

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Jeff Drumm

Expertise

I Can answer any question pertaining to semi trucks and trailers. Have no experience in the automotive field so not able to help in that area.

Experience

My experiences in Semi Trucks is. I own my own truck and i presntly maintain a 80 truck fleet. Can handle any questions pertaining to a truck have tore apart and rebuilt every aspect on them. Fleet I deal with is Mainly Volvo trucks and a handful of freightliners. Work on automated transmissions on a daily basis along with carrier apu's. With engines my specialty is the 60 series Detroit but do work on the cummins isx the n-14 and the ism. and also the Volvo engines.

Education/Credentials
Have a College Degree from university of northwestern ohio in diesel and agriculture mechanics. Have 10 years behind the wheel driving a truck and 4 years working on trucks full time. Also have grown up on a farm so have been tinkering on trucks and tractors all my life.

Awards and Honors
I've gone through online schooling and have received certificates from webb wheel, Timken and Volvo academy.

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