308 water pump / how to install 1-piece seal | FerrariChat
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308 water pump / how to install 1-piece seal

Discussion in '308/328' started by Martin308GTB, Aug 27, 2010.

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  1. Martin308GTB

    Martin308GTB F1 Rookie

    Jan 22, 2003
    4,286
    Black Forest Germany
    Full Name:
    Martin N.
    #1 Martin308GTB, Aug 27, 2010
    Hello from Germany,

    I have one of the latest design of 308 waterpumps with that 1-piece seal no. 152051, also used on some TRs.

    For example: http://www.ricambiamerica.com/product_info.php?products_id=81


    Now I would like to rebuild my pump, because some people say, that that latest design was the most reliable.
    I have the problem, that I don't know how to install the seal properly without damaging the bearings.
    So far I have figured out, that I need a special tool - probably self made - to press the inner sleeve onto the shaft while pressing the outer part into the housing at the same time.
    But I fear, that I could damage the bearings, because I apply force going across the bearing's balls.

    Did someone of you perform this task recently ? Can you give me any hints for the proper procedure ?

    Best Regards and thank you in advance

    Martin
     
  2. Ferraripilot

    Ferraripilot F1 World Champ
    Owner Project Master

    May 10, 2006
    17,922
    Atlanta
    Full Name:
    John!
    #2 Ferraripilot, Aug 27, 2010
    I rebuilt my pump a couple years ago and recall having to craft a drafting tool that would allow both the inner bearing races and outer bearing races to have equal pressure applied while installing so the ball bearings were not stressed. I made the tool from delrin and hit it with a mallet. Nothing else about the project was particularly difficult and the unit is very self-explanatory once apart. The new style of seal does look much better and I will certainly use it once required.
     
  3. Martin308GTB

    Martin308GTB F1 Rookie

    Jan 22, 2003
    4,286
    Black Forest Germany
    Full Name:
    Martin N.
    #3 Martin308GTB, Aug 27, 2010
    Hello,

    thank you. To explain my concerns more; If I support the shaft while pressing the seal into the housing I stress the bearing.
    If I support the housing while pressing the seal onto the shaft I stress the bearing as well.
    How do I have to support the pump unit while pressing the seal onto the shaft and housing at the same time - what's mandatory - and avoid stressing the bearings ?
    This is where I struggle at the moment.

    Best Regards

    Martin
     
  4. Ferraripilot

    Ferraripilot F1 World Champ
    Owner Project Master

    May 10, 2006
    17,922
    Atlanta
    Full Name:
    John!
    #4 Ferraripilot, Aug 27, 2010
    Last edited by a moderator: Sep 7, 2017
    From what I remember, I installed the shaft and bearings first and then installed the impeller and seal. The seal did not have to press on, but rather it slid on very easily and was secured by the impeller and acorn nut. Sorry if I'm not getting this 100% right, it's been a couple years.
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  5. Martin308GTB

    Martin308GTB F1 Rookie

    Jan 22, 2003
    4,286
    Black Forest Germany
    Full Name:
    Martin N.
    #5 Martin308GTB, Aug 27, 2010
    then you must have had a different seal. That 1-piece seal I'm talking about has a fairly tight fit on the shaft and inside the housing.

    Best Regards

    Martin
     
  6. mustardfj40

    mustardfj40 Formula 3

    Jun 17, 2004
    1,142
    Northen California
    Full Name:
    Ken
    #6 mustardfj40, Aug 27, 2010
    For the one piece seal what I did is to gradually press in the inner part a tiny bit then press in the outer part an tiny part, then do inner again, then outer.... If you're going to hammer it in then be very careful with cracking the ceramic (it looks like steel but it is not)
     
  7. Martin308GTB

    Martin308GTB F1 Rookie

    Jan 22, 2003
    4,286
    Black Forest Germany
    Full Name:
    Martin N.
    #7 Martin308GTB, Sep 1, 2010
    Thank you ! I think I have figured out how to carry on based on your description.
    I lathed a tool which presses on the inner and outer part at the same time.

    The part from which you think it's made of ceramic - like the earlier designs -, seems to be actually made from sintered metal ( more modern design for axial face seals ). At least this is what I think after examination of the old seal. The matching part is - like it always was - artificial carbon.

    Best Regards from Germany

    Martin
     

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