QD19 Overheat Question – Update

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This topic contains 67 replies, has 15 voices, and was last updated by  retiredoz 2 years, 7 months ago.

Viewing 15 posts - 31 through 45 (of 68 total)

  • beerman57

    Replies: 596
    Topics: 126
    #18826

    Yes, the shallow divider. Man, I even went to Ken Cook Co. and all there is, is generic manuals.


    lotec

    Replies: 162
    Topics: 10
    #18828

    I believe the service bulletin covering the hot leg/paint charring and drilling a water passage to cool it was for the 1955 model year Big Twin/RD motors not the Sportwin/QD. I’m not home so I can’t post that bulletin but I did the update to my ’55 Big Twin so that’s why I remember it. I’ve never seen a "hot shifer" problem on the post ’57 Sportwin/RD models and owned at least a dozen of them, nor do I recall a bulletin on this issue with that series motor. Unfortunately, I think the problem must be elsewhere. Actually a common problem I’ve seen on the Sportwin/QD is water leaking (sometimes profusely!) at the shifter due to wear or a bad O-ring.


    fleetwin
    US Member - 1 Year
    Replies: 2456
    Topics: 29
    #18829

    Art-
    So your theory is that due the sloppy shift handle, exhaust is relieving through the sloppy bushing causing the excess heat on the handle? Could be.


    beerman57

    Replies: 596
    Topics: 126
    #18836

    I believe there was a bulletin on an RD overheat problem, I’ll go back and look. If so, I’ll be able to get the number, but won’t be able to read it.
    NOPE, a few close, but can’t open/read them.
    http://www.fiberglassics.com/library/Ev … _Bulletins

    #98 – exh. gas
    #152 – new fastwin exh. tube
    #408 – 10hp conn. rod
    #714 – 1965-66 5hp overheat
    #766 – overheat 3, 5 and 6hp
    #811 – overheat 1967-68 40hp


    lotec

    Replies: 162
    Topics: 10
    #18853

    Here’s a link to the Service Bulletin that I think is what Gary had in mind – as I noted it is for the early 1955 (Mfg late ’54) model year RD/Big Twin not the QD/Sportwin. Link: http://www.oddjobmotors.com/Misc%20Stuf … 20burn.pdf I can’t find anything on a problem with the QDs along these lines.

    Regarding the leakage around the handle, yes, my thinking is that if it was worn enough, it’s possible the exhaust heat escaping around the shift handle could heat it up? Not sure what else – I’ve never seen a problem like this. But a 60+ year old motor and many prior owners bodging repairs, who knows….


    beerman57

    Replies: 596
    Topics: 126
    #18854

    Thanks lotec, I guess that wouldn’t apply to a QD since the base of the powerhead is no where near the same. Darn, I thought maybe we had it!


    garry-in-tampa
    Lifetime Member
    Replies: 2914
    Topics: 29
    #18855

    OK – I have found bulletins from 1946 through 1951 and 1959 through 1971. I don’t know what happened to 1952 through 1958 …

    I did not find what I was looking for, but it was entertaining reading through ’59 through ’67. There were pages of stolen motor bulletins that were eliminated as "obsolete". In any case, the statute of limitations has run out so you all can now proudly display your stolen motors.

    . . . . . 😀

    Mumbles
    Mumbles
    Canada Member - 2 Years
    Replies: 3797
    Topics: 367
    #18877
    quote Garry in Tampa:

    In any case, the statute of limitations has run out so you all can now proudly display your stolen motors.

    . . . . . 😀

    Does that mean all the motors I have which are missing their, ahem, ID plates? 😯


    jeff-register
    US Member - 1 Year
    Replies: 999
    Topics: 40
    #18882

    Robert,
    Garry has been around outboards from day one almost. I’m with him thinking we have a design flaw before it was revised, then came the service report to drill an extra hole for cooling. Nothing to go by but my gut feeling is that Garry has it right. I have looked at very many water discharge from around the head with OMC products without any issues with sucking up water from the bottom seal. My Scotts are the same way, very close to the driveshaft area too. It also seems to cool the shift handle water needs to be close enough to get & keep the linkage with a constant flow of water. I too think between both cylinders firing at 180 degrees out from one another the exhaust gasses are forced down the leg for continued cooling. I bet too the late 58s are different than the early ones too.
    Best,
    Jeff


    beerman57

    Replies: 596
    Topics: 126
    #18892

    So drill a hole like Mumbles said, back on page 3. Drill it from the water intake side so it will be angled slightly down?

    I bet too the late 58s are different than the early ones too.
    You know, I have another QD19 mid, I’ll check serial numbers and inspect it for differences from this one. I know the driveshafts are different – one has splines at the bottom, the other has a key/keyway.


    joecb
    US Member - 1 Year
    Replies: 304
    Topics: 55
    #18894

    A very timely discussion, I too have been looking for the info on drilling the auxiliary cooling hole, haven’t been able to find it yet. All hope lies with Garry to come to the rescue… again!

    Joe B


    phil-b

    Replies: 467
    Topics: 32
    #18898

    I thought the keyed to splined drive shaft changed in 1960 (QD21 -> QD21S) along with heavier gears.


    fleetwin
    US Member - 1 Year
    Replies: 2456
    Topics: 29
    #18901

    Yes, at this point, I would go with mumble’s drilling advice. It will be easy enough to plug this hole if the fix does not work out. The only other idea would be to find a different mid section with the longer divider wall between the shift linkage and exhaust cavity, but it would have to be from another 58 model.


    beerman57

    Replies: 596
    Topics: 126
    #18967

    OK, Saturday it gets drilled, right?


    chris-p
    Canada Member - 1 Year
    Replies: 2428
    Topics: 154
    #18969

    That may help solve the problem. However, I personally would love to know WHAT is causing it!

    Pull that plate as well, have a peek inside to see if the bypass port is plugged.

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