Low oil pressure after new oil pump o-ring install!? P R O J E C T - "S"

Discussion in 'Airheads' started by TINK, Jun 17, 2013.

  1. TINK

    TINK Been here awhile

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    #1
  2. Solo Lobo

    Solo Lobo airhead or nothing

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    Years ago I asked my dealer for a new oil pump cover o-ring and they gave me one that was too thick... perhaps it was the flywheel o-ring.

    Anyway that chowed the big-end bearings on big ends of the R60/5 that I had just done a complete top end on.....
    #2
  3. disston

    disston ShadeTreeExpert

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    The problem does not have to be the O-ring. But to begin with that since it was something you last touched, are you sure it was the oil pump O-ring you installed? The is another O-ring that is very close. I think it's the cylinder base O-ring but it might be the flywheel spacer O-ring. One of them is sometimes mistaken for the oil pump O-ring.

    I don't think you should start there. How about the oil pressure regulating valve, This is part of the front bearing holder that is under the timing chain crank sprocket. A broken spring in this will cause oil pressure problems. You have to remove the timing cover to look at it. They do go bad.

    There is also a bypass valve in the oil filter canister area. It is at the back of where the filter is. Remove filter and look at the back, you should see a ball check valve. Is the ball in place? Can you push it in a tiny amount with a skinny screwdriver and it pops back out into place?
    #3
  4. chollo9

    chollo9 Screwed the Pooch

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    Yes, the flywheel o-ring is very close and easy to mix-up. I installed the wrong one this past winter and luckily could tell it wasn't right when I was tightening the screws--too mushy!. MAX sent the two o-rings in one baggie with no markings and I chose incorrectly.

    If this is your problem, there would be extra side clearance on the pump rotor and low pressure.
    #4
  5. TINK

    TINK Been here awhile

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    I did notice that once the cover had contacted the o-ring the bolts took several complete turns, and felt "mushy" to me. I thought :confused I had very carefully selected the correct of the two o-rings, but I too had them both in the same bag with no markings.

    Trying to find the oil pump cover o-ring specs:

    11 22 1 337 099 - 59X3MM fly wheel
    11 41 1 335 895 - ??X?MM oil pump cover


    :hmmmmmI'll add this to my list of theories, but I'm almost sure this is going to be my problem. I just hope I did no damage the engine by riding it when I should not have :baldy

    TINK


    #5
  6. disston

    disston ShadeTreeExpert

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    I'm sure I've seen that measurement and thought I may have it somewhere but after an hour of looking I can't find the info. It's probably buried on Snowbunm's site. :lol3
    #6
  7. TINK

    TINK Been here awhile

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    With the help of my internet friends, thank you, I have determined that I SCREWED UP.
    Yes, it's true, I made a mistake and I now have low oil pressure as a result.
    I'm now convinced that I reversed the flywheel o-ring and the oil pump cover o-ring (thanks Nick for the pic).
    So, take her apart and start over...

    [​IMG]

    Need the following parts... AGAIN.

    11 41 1 335 895 O-RING, oil pump x1

    11 22 1 337 099 GASKET RING (from 09/78), flywheel inner o-ring x1

    PLEASE BAG AND LABEL THESE TWO O-RINGS SEPARATELY.

    I believe I got these two reversed and installed the flywheel o-ring
    (larger of the two, I think) on the oil pump cover as I now have a
    low oil pressure condition which I did not have before repair.


    ***

    21 21 1 231 463 FILLISTER-HEAD SCREW (to 09/80), clutch plate bolts x6

    11 22 1 262 060 HEX BOLT - M11X1,5, flywheel bolts x5

    07 11 9 913 464 HEX BOLT - M6X16 (to 09/80), oil pump cover bolts x4

    ***

    07 11 9 963 130 GASKET RING - A12X15,5 AL, drive shaft oil drain/fill x2

    26 11 1 242 297 SCREW - M8X1, drive shaft bolts x4

    These short bolts 26111242297 fit 1981-1995 Airheads; do not use washers.
    Some people like to use the short bolts on pre-1981 models also (without washers.

    ***

    11 13 1 338 427 oil pan gasket x1

    07 11 9 963 300 GASKET RING - A18X22 oil drain washer x1

    11 00 9 056 145 SET: REPAIR KIT FOR OIL CHANGE oil filter kit x1

    TINK

    #7
  8. chollo9

    chollo9 Screwed the Pooch

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    Fingers crossed that you had sufficient oil pressure, I'm betting you did.
    #8
  9. TINK

    TINK Been here awhile

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    I'll take that bet, and I'm crossing my toes too :wink:

    #9
  10. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    With the low suggested torque value of the oil pump cover bolts the thicker "wrong" o-ring won't compress enough leaving you with too much clearance in the oil pump and low HOT oil pressure. Not optimum, but over the short time that you ran it, there was probably little or no damage. You caught the problem early, good for you. BUT if anything was damaged, it would have been a rod bearing, which is easy to check and inexpensive to replace. As a quick check, remove the oil filter, cut it apart, unroll it and read it-- shiny and/or coppery flakes are un-good.

    --Bill
    #10
  11. Solo Lobo

    Solo Lobo airhead or nothing

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    I tried really, really hard to ride my R60/5 home about three miles with no/little oil pressure after I had been sold the wrong, thicker o-ring for the pump cover and was able to very lightly polish the crank, put in new bearings and had no issues.

    Make sure to buy (and use) some plastigauge if you suspect or change the rod bearings.
    #11
  12. TINK

    TINK Been here awhile

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    Thanks Bill. checking the oil filter for flakes is definatly on the agenda, will report back. I figured the rod bearing would be the first to suffer, we'll see... fingers and toes crossed.
    TINK


    #12
  13. TINK

    TINK Been here awhile

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    Here we go again. This time I'll get it right.
    [​IMG]

    TINK
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  14. villageidiot

    villageidiot Long timer

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    you know what the good german frau says.....

    ubung mach den meister
    #14
  15. TINK

    TINK Been here awhile

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    Six hours start to finish to correct my o-ring error. :baldy
    Oil light now turns off while cranking, before she fires. :clap:clap:clap
    No engine knock! :freaky
    Will put oil pressure gauge tool on her in the morning and record the readings. :ear

    [​IMG]

    [​IMG]

    [​IMG]

    TINK
    #15
  16. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    Success.

    And those are good how-to photos.

    --Bill
    #16
  17. Kai Ju

    Kai Ju Long timer

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    I hope that 6 hours included time to block the crank ?:D
    Glad it's fixed.
    Nice job on letting folks know what not to do. Let's call it the school of loud knocks...:rofl
    #17
  18. TINK

    TINK Been here awhile

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    Oh ya, we blocked that crank, using the Kai Ju method. :rayof
    [​IMG]


    #18
  19. TINK

    TINK Been here awhile

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    Here's the oil pressure readings with the correct oil pump cover o-ring.

    psi @ rpm - temp

    120 @ 1500 - cold
    90 @ 1000 - cold
    130 @ 4000 - cold

    60 @ 1000 - warm
    70 @ 1300 - warm
    90 @ 3000 - warm

    95 @ 4000 - hot
    35~38 @ 1000 - hot

    TINK
    #19
  20. chollo9

    chollo9 Screwed the Pooch

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    Yeah baby, Park Tool to the rescue.

    Those look like good pressures, how did the filter look?
    #20