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Thread: Question about D2 Fuel Pump housing

  1. #1
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    Default Question about D2 Fuel Pump housing

    So, i am in the process of rebuilding a D2 and i have a question.

    How does the fuel pump housing maintain its oil level?
    There are some corresponding holes that allow the oil to flow from the pump housing into the transfer pump cavity in the bottom of the fuel tower and then into the rear timing cover where it empties out into the engine oil pan.

    The only thing i can figure is that a gasket should block the hole between the fuel tower and rear timing cover?

    The pictures below show the holes i am talking about with the white wire running thru them.
    Attached Images Attached Images
    Erik Christenbury
    Cat List: More than some, less than others
    https://chriscomachinery.com/caterpillar-machinery/

  2. #2
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    Faunsdale, AL USA
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    Default

    Wow!

    I think you're right.......that must be blocked somehow. I would block it where there is a seal on the drive shaft. If it's at the front case to fuel tower joint then block it there as you said. If there's a seal at the front of the injection pump housing that would make me want to know more.

    I think I would want something more secure than just the gasket material.

    Looks like an easy way to make a bad mistake.
    D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time

  3. #3
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    Default

    That must be a 3J or 5J series.

  4. #4
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    Default

    Quote Originally Posted by Rome K/G View Post
    That must be a 3J or 5J series.
    You are once again correct- its a 3J series
    Erik Christenbury
    Cat List: More than some, less than others
    https://chriscomachinery.com/caterpillar-machinery/

  5. #5
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    victoria australia
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    Default Injection Pump Camshaft Lip Seal

    Hi Team,
    if you check the parts book you will see a lip type seal with its lip facing back towards the injection pump.

    I stand to be corrected but,
    it likely that this lip seal is a static seal as I think it seals on the OD of the front pump camshaft bearing.--oil scrolls on both the Injection Pump Camshaft and the pump end of the Accessory Drive shaft keep the oils in their respective housings.
    This seal and the scrolls along with gaskets between the housings do the rest to keep the oils separated.
    The Accessory Drive Shaft and the Transfer pump drive etc is lubed by engine oil.

    Cheers,
    Eddie B.

  6. #6
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    Default

    Quote Originally Posted by edb View Post
    Hi Team,
    if you check the parts book you will see a lip type seal with its lip facing back towards the injection pump.

    I stand to be corrected but,
    it likely that this lip seal is a static seal as I think it seals on the OD of the front pump camshaft bearing.--oil scrolls on both the Injection Pump Camshaft and the pump end of the Accessory Drive shaft keep the oils in their respective housings.
    This seal and the scrolls along with gaskets between the housings do the rest to keep the oils separated.
    The Accessory Drive Shaft and the Transfer pump drive etc is lubed by engine oil.

    Cheers,
    Eddie B.
    Eddie, you are correct,

    we found the small housing that holds the seal, (fell behind some things) and i did not notice it on the parts diagram until further review.

    Thank you all for your input!
    Attached Images Attached Images
    Erik Christenbury
    Cat List: More than some, less than others
    https://chriscomachinery.com/caterpillar-machinery/

  7. #7
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    Default

    So in that arrangement what would be the route of fuel leakage from the infamous fuel gallery seal be?

  8. #8
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    Default

    Quote Originally Posted by Old Magnet View Post
    So in that arrangement what would be the route of fuel leakage from the infamous fuel gallery seal be?
    i just left the shop, but i will check on that in the am.
    Erik Christenbury
    Cat List: More than some, less than others
    https://chriscomachinery.com/caterpillar-machinery/

  9. #9
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    Default Rear Fuel Gallery Plug Seal Leak Path

    Hi Om,
    whilst looking back in Search for an answer to a no rear fuel gallery plug question I found your query on the leakage path for the rear fuel gallery plug was unanswered.

    CCJ answers your query in post #8 of this linked Thread.

    http://www.acmoc.org/bb/showthread.p...t=gallery+plug

    Cheers,
    Eddie B.

  10. #10
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    Default

    Thanks, I got it fixed and failed to report my finding, sorry
    Erik Christenbury
    Cat List: More than some, less than others
    https://chriscomachinery.com/caterpillar-machinery/

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