Question about OTC 7471A CUMMINS DIESEL ENGINE BARRING TOOL - 7471A

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Removing a air compressor on a n14 cummins - OTC 7471A CUMMINS DIESEL ENGINE BARRING TOOL - 7471A

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Posted on Jan 02, 2017

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SOURCE: timing

to answer the first question:
the timing marks are on the accessory drive pulley. you will have an A, B, and C with a line at each one. you will line those up with the raised portion of the front gear cover. more likely than not, the letters are either painted over or rusted over, so they may be somewhat hard to spot. you will have to use a 1 5/16" socket to bar the engine over by the nut on the accessory drive pulley.

the second question: to removed the air compressor, you will need to disconnect all the lines going to and from the air compressor and fuel pump. this includes having to drain your coolant in order to disconnect the cooling lines to the compressor. you will need to remove fuel lines, air lines to the air governor, and anything else that may hang up. be prepared to replace any gaskets that you disrupt during this process, because they WILL leak if you do not. there are, if i remember correctly, 4 5/8" nuts that hold the air compressor on the accessory drive, 3 of them are relatively easy to get to, however the 4th, the one at the top closest to the block, must be removed with a special wrench, it is an S shaped wrench that you can buy from a snapon or matco dealer made specifically for that nut. once they are removed the compressor/fuel pump assembly should come right apart. if any damage is done to the accessory drive however, you must replace that as well, which could lead to a very large mess.

I myself work for Cummins, and have recently done this very repair for local cement company. I had to replace the accessory drive gasket due to a leak. Once the accessory drive was removed, I found that the accessory drive bushing in the gear housing had spun. That leads to a repair of having to replace the entire gear housing. To due so you must hoist the engine up and remove the front engine supports and removed that entire housing. So be warned, it may be a much more daunting task then it seems to appear.

Good Luck

Posted on Jun 25, 2009

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2 Answers

Timing


to answer the first question:
the timing marks are on the accessory drive pulley. you will have an A, B, and C with a line at each one. you will line those up with the raised portion of the front gear cover. more likely than not, the letters are either painted over or rusted over, so they may be somewhat hard to spot. you will have to use a 1 5/16" socket to bar the engine over by the nut on the accessory drive pulley.

the second question: to removed the air compressor, you will need to disconnect all the lines going to and from the air compressor and fuel pump. this includes having to drain your coolant in order to disconnect the cooling lines to the compressor. you will need to remove fuel lines, air lines to the air governor, and anything else that may hang up. be prepared to replace any gaskets that you disrupt during this process, because they WILL leak if you do not. there are, if i remember correctly, 4 5/8" nuts that hold the air compressor on the accessory drive, 3 of them are relatively easy to get to, however the 4th, the one at the top closest to the block, must be removed with a special wrench, it is an S shaped wrench that you can buy from a snapon or matco dealer made specifically for that nut. once they are removed the compressor/fuel pump assembly should come right apart. if any damage is done to the accessory drive however, you must replace that as well, which could lead to a very large mess.

I myself work for Cummins, and have recently done this very repair for local cement company. I had to replace the accessory drive gasket due to a leak. Once the accessory drive was removed, I found that the accessory drive bushing in the gear housing had spun. That leads to a repair of having to replace the entire gear housing. To due so you must hoist the engine up and remove the front engine supports and removed that entire housing. So be warned, it may be a much more daunting task then it seems to appear.

Good Luck

Mar 26, 2009 | OTC 7471A CUMMINS DIESEL ENGINE BARRING...

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