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Cat 3306 PC injection pump?
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98mxz583
Posted 1/8/2018 06:43 (#6488248)
Subject: Cat 3306 PC injection pump?



Traverse City MI		Looking at a project that has a 3306 PC engine in it that wont start. Its been sitting a couple years and I'm assuming from the research I have done the rack is stuck. Can you free it up on the machine and whats the best way to keep it from sticking again?
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hillfarmer
Posted 1/8/2018 07:16 (#6488318 - in reply to #6488248)
Subject: RE: Cat 3306 PC injection pump?



watching

had a P pump on a engine last winter quit

had problems priming one this winter

installed a 60 # gauge going into the high pressure pump

the pressure was low so we changed the relief valve in the return line from the pump

hand primer will mak e20 # the engine is running with 12 # with a brand new lift pump

guy says I need 20 #, I am not sure on the 20

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jimgen
Posted 1/8/2018 18:04 (#6489725 - in reply to #6488318)
Subject: RE: Cat 3306 PC injection pump?


central mich		Yes you can work on them if you have the ability. You will need the Cat tool to remove the "bonnets" that the injector lines screw to. Below that are the plungers , springs and quite a few pieces. My guys just did a Cat V8 D336 on a gen set that we had stored for many years. Gen set only had 600 hrs so we fixed it when normally we would scrap something that old. They just got it put back together and running today. A lot of the parts were damaged when they disassembled (welded bolts to the plungers and had to use slide hammer, Never had one stuck so bad) and in fact the Cat tool would not remove 4 of the bonnets so the guys welded nuts to remove.

On the 3306 if the pump has the side plate on it then we have removed and sometimes you can get the injectors working there. Best way to keep them from sticking is roll the motor or start it. Our motor has always been in cold storage and they got very stuck from setting for over 20 years when we last ran that motor.

The rack is stuck because the plungers are stuck. Maybe not all but at least one.

Edited by jimgen 1/8/2018 20:50
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hillfarmer
Posted 1/8/2018 18:14 (#6489754 - in reply to #6489725)
Subject: RE: Cat 3306 PC injection pump?



jimgen - 1/8/2018 19:04


Yes you can work on them if you have the ability. You will need the Cat tool to remove the "bonnets" that the injector lines screw to. Below that are the plungers , springs and quite few pieces. My guys just did a Cat V8 D336 on a gen set that we had stored for many years. Gen set only had 600 hrs so we fixed it when normally we would scrap something that old. They just got it put back together and running today. A lot of the parts were damaged when they disassembled (welded bolts to the plungers and had to use slide hammer, Never had one stuck so bad) and in fact the Cat tool would not remove 4 of the bonnets so they guys welded nuts to remove.

On the 3306 if the pump has the side plate on it then we have removed and sometimes you can get the injectors working there. Best way to keep them from sticking is roll the motor or start it. Our motor has always been in cold storage and they got very stuck from setting for over 20 years when we last ran that motor.

The rack is stuck because the plungers are stuck. Maybe not all but at least one.


Jim
Do you think I need 20 # while running
TIA
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jimgen
Posted 1/8/2018 20:46 (#6490340 - in reply to #6489754)
Subject: RE: Cat 3306 PC injection pump?


central mich
I would have to look which I can do tomorrow. It just needs enough pressure to deliver enough fuel at max load.

I know we have a Mich Spec with 3406B and it had a filter before transfer pump and the standard one after transfer pump. Well when loaded the fuel pressure would drop off too much to maintain power. We used same filters on both bases. Put new filters and it might run 500 miles and same issue. Finally I had an idea. I installed just a water filter in front of transfer pump. That solved the problem. The push rod transfer pump on the B models are pretty weak compared to a gear pump IMO.
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hillfarmer
Posted 1/9/2018 04:20 (#6490865 - in reply to #6490340)
Subject: RE: Cat 3306 PC injection pump?



For the last year I have had a 50 year mech tell me he has been told to keep 20 # running
And can't get the push rod pump to stay over 12 at an Idle

much less for power Thanks
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