Turbo Oil Inlet Repair - Previous thread
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  1. #1
    Senior Member 81custom's Avatar
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    Turbo Oil Inlet Repair - Previous thread

    Hi guys,

    During the process of this bikes resurrection, I managed to removed the top oil inlet fitting from the Turbo and it has been broken previously. I remember seeing this being repaired, and haven't been able to find the actual thread with the repair method.. Does anyone remember who posted it - I've spent nearly two hours trying to locate this topic with no result I'm afraid.

    what I suppose I'm really after would be the dimensions of the underside of the piece itself - and see if I can get this one repaired.

    Try and attach a photo to show the damaged one.
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    81 CX500 Custom

    82 CX500 Turbo

  2. #2
    Senior Member 81custom's Avatar
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    Sorry,

    I also forgot to say thank you in advance for anyone who finds the thread.
    81 CX500 Custom

    82 CX500 Turbo

  3. #3
    Senior Member dutchturbo's Avatar
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    I've repaired it a few years ago. Mine was also broken. See pictures how I did it.
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    I made it press fit. Drilled a bigger hole on the milling machine in the inlet and made on the lathe an appropriate piece which is slightly bigger in diameter. A little stud-lock and pressed it together. Only force on it is when you want to remove it and if you don't do that good it breaks off. Succes
    Last edited by dutchturbo; 08-19-2014 at 04:48 AM.

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  5. #4
    Senior Member 81custom's Avatar
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    Thank you so much for the pictures - I just need a few measurements for the total depth of the length going from the underside of the inlet to the tip...I'll then get one made up - and mine resurrected..

    Although I have been advised another member has one available - I would like to get this one repaired anyway - for future processes.

    thanks
    81 CX500 Custom

    82 CX500 Turbo

  6. #5
    Senior Member edinlr's Avatar
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    All of the o-rings on the inlet and outlet are still available from Honda, so replace those too. The cost is about $10 for four of them. I'm sure there are substitutes, but for the price I am still using Honda parts while available.
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  7. #6
    Senior Member abecedarian's Avatar
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    Quote Originally Posted by 81custom View Post
    Thank you so much for the pictures - I just need a few measurements for the total depth of the length going from the underside of the inlet to the tip...I'll then get one made up - and mine resurrected..

    thanks
    What my eye measures:
    Tip to O-ring groove - 2 mm
    O-ring groove width - 3 mm
    O-ring groove to turbo center-housing flange - 4 mm
    Overall from tip to turbo housing flange - 9 mm.

    Oil hole diameter at tip - 2 mm
    O-ring inside diameter - 7 mm
    O-ring outside diameter - 11 mm.

    Someone with an O-ring handy could probably verify that.
    1982 CX500TC- JH2PC0300CM000120
    You can lead the horticulture but you can't make her think.

  8. #7
    Senior Member edinlr's Avatar
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    While we are on this topic, I have a question that is in the same neighborhood. The factory hose has a restrictor in the oil feed hose to the turbo. I have put straight hose back on many times as the factory spec hose has long been discontinued. I am also aware that too much oil can cause seal problems in the turbo, so what do we do? Is there too much flow on the turbo to where it will cause problems? Engineer a restriction at the joint that would limit the oil flow? This seems smarter than making it gather up in the hose. Any thoughts or advice here? Just let it go and don't worry about a restriction? Pim? Don? DV8? Come on guys, chime in.
    CX500C
    CX500T
    CX650E
    CX650T
    Hawk
    CB750 w/turbo
    RG500
    V-Max
    Kawasaki 750 Turbo
    Katana 1000
    Ducati 749R
    Screaming Eagle Road King
    CBR600F3
    Honda Metropolitan
    Ninja H2 1000
    & a dozen battery chargers

  9. #8
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    What kind of restrictor?

  10. #9
    Senior Member edinlr's Avatar
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    There is a small restrictor in the oil feed line to the turbo. Years ago I was checking the hose to make sure there was nothing in there and ran into the restrictor. I still wonder why they didn't just put a smaller outlet hole on the piece above, why mess with a restrictor?
    CX500C
    CX500T
    CX650E
    CX650T
    Hawk
    CB750 w/turbo
    RG500
    V-Max
    Kawasaki 750 Turbo
    Katana 1000
    Ducati 749R
    Screaming Eagle Road King
    CBR600F3
    Honda Metropolitan
    Ninja H2 1000
    & a dozen battery chargers

  11. #10
    Senior Member 81custom's Avatar
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    Gee,

    I though more oil flow in this area would be required to minimise any possible damage to the bearings - or increase their life expectancy...

    Being an unknown pressure at the line exit from the engine - I would make an assumption it runs normal oil pressure - probably up to 30 PSI - if that is the case forcing that much into the turbo wouldn't hurt IMHO - and the bottom outlet is only a gravity feed through to the sump anyway - so I cannot understand the need for any restrictors.... I know there are some in the vacuum tubes for the pressure sensors so maybe someone stuck one of those in by mistake ????

    Any mention of one of these restrictors on the shop manuals ?
    81 CX500 Custom

    82 CX500 Turbo

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