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I have a 2001 volvo day cab and I changed the head gasket on it but as I go back to put the pulley injectors in, I'm so confused because they are no indicators on them which should be labels A, B of C. So when I put them back in to what I thought was right according to the CUMMINS REPAIRS used, they engine runs like crab. It's skipping and sounds like the engine is about to run away.. Please help! Does anyone know about the indicators that suppose to be on the engine which are label A, B or C??

the indicator your looking for will be on the accesory drive pulley will be a a,b,c you will line the mark up with a protruding piece of casting on the timing cover.  When wou look at the accesory drive pully it will be on the 1/4'' strip of metal on the engine side of the belt.

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Jeff Drumm


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.


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.

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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