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  1. #1
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    Question Need engine coupler for Ford 5.8L to King Cobra

    I have a 93 Four Winns with a 5.8L, 360 HP connected to a King Cobra I/O drive. The splined sleeve spun leaving no splines. I need an OMC engine coupler P/N 987528 or suitable substitute. I have been scouring every on-line marine salvage site for this part. Anyone have any ideas? The boat is in excellent shape, the engine runs strong and the lower unit is excellent. The coupler, however is required! Thanks...

  2. #2
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    Dec 2015
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    Give seaway a call 425-412-4006 weekdays only you got an hour or wait till monday.
    It takes a nickle to go first class!
    If it aint broke dont fix it!!

  3. #3
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    [QUOTE=kimcrwbr1;589630]Give seaway a call 425-412-4006 weekdays only you got an hour or wait till monday.

    I e-mailed their site and received a response that they do not have the part. Thanks for the recommendation. A salvage yard in NH directed me to them.

  4. #4
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    Will a VP coupler work? # 3853862 or 3850520 Ricardo may know or have one?
    Last edited by kimcrwbr1; 09-29-2017 at 07:15 PM.
    It takes a nickle to go first class!
    If it aint broke dont fix it!!

  5. #5
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    From my research the coupler #3853862 or sierra 18-21753 is the ticket from a 1994 OMC 5.8l
    Last edited by kimcrwbr1; 09-29-2017 at 07:51 PM.
    It takes a nickle to go first class!
    If it aint broke dont fix it!!

  6. #6
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    Are you going to replace the gimbal bearing and U-joints?
    It takes a nickle to go first class!
    If it aint broke dont fix it!!

  7. #7
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    I will try the coupler you listed. The U-joints and gimbal bearing were replaced about 2-3 years ago when I could feel, at low speed, a vibration that was not normal. At that time the coupler was not examined.

    Where did you research that this coupler will possibly work? I have been working on this since early August and no one has suggested that this may work. Just curious.

    Thank you.

  8. #8
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    I would wait for word from Ricardo. I cross referenced the yoke and gimbal bearing for the 1994 supersede I could not confirm the bolt pattern for the flywheel bolts tho. Yea I am surprised OMC does not give you numbers the original number was only for two years for the king cobra drives 93-94. I just checked the numbers I gave you are the same for the 1991 5.8.
    Last edited by kimcrwbr1; 09-30-2017 at 09:47 AM.
    It takes a nickle to go first class!
    If it aint broke dont fix it!!

  9. #9
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    [QUOTE=kimcrwbr1;589659]I would wait for word from Ricardo. I cross referenced the yoke and gimbal bearing for the 1994 supersede I could not confirm the bolt pattern for the flywheel bolts tho. Yea I am surprised OMC does not give you numbers the original number was only for two years for the king cobra drives 93-94. I just checked the numbers I gave you are the same for the 1991 5.8.

    I assume Ricardo is another contributor to this site and will eventually read my question.

  10. #10
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    I had ordered the OMC 3853862/Sierra 18-21753 prior to starting this string. There is a 5/8" difference in height where the flange for connecting to the flywheel is. Also the"sleeve" that slides through the bell housing is shorter. The technician at my marina is concerned that the additional height will not allow the lower unit to fit tight against the transom.

    Anyone have any other possible substitutions for an OMC 987528 coupler?

    Thanks...
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  11. #11
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    There are two different yokes the only thing I can think of is you have the long yoke I will find the part number for the short yoke.
    It takes a nickle to go first class!
    If it aint broke dont fix it!!

  12. #12
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    Do you have the drive off of the transom plate? Put the couplers on the yoke and measure from the flange where it bolts to the flywheel to the flat spot on the yoke.
    It takes a nickle to go first class!
    If it aint broke dont fix it!!

  13. #13
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    Unfortunately at noon I dropped the replacement coupler in the mail to return. I know the drive shaft on the lower unit from the end of the shaft to the base of the yoke on the shaft is 9". If you measure from the end of the shaft to the C/L of the yoke it is 12 inches. I believe, not sure, that I have the shorter shaft of the two.

  14. #14
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    I wish someone who know would chime have you measured how far in the coupler the splines are stripped? Are there any good splines left in the coupler?
    It takes a nickle to go first class!
    If it aint broke dont fix it!!

  15. #15
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    The coupler spines are completely gone. There is not a spine left. I was very surprised when I saw this as it was a complete catastrophic failure. I would have expected the splined sleeve to spin in the rubber before sheering all of the splines away. The splines on the drive shaft are perfect. I assume that there is a difference in material composition. When the lower unit was pulled all of the shavings, full length of the spline dropped out.

  16. #16
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    Here is a idea....Just use the Serria coupler and a early style Mercruiser stub shaft as its shorter
    Pappys Sales and Service
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    Former racer KDBA (Kentucky Drag Boat Association)

  17. #17
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    Faztbullet, thank you for the suggestion. The concern remains that the new coupler's flange that attaches to the flywheel is 5/8" taller than the original. Thus it will either not allow the engine to fit back in or will hit/rub the transom. It does not appear that the shaft it the concern as it is the shorter shaft available.

  18. #18
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    Considering the shaft assembly is a Mercruiser type a short shaft is available. The same for the U joints and gimbal bearing. So considering a Mercruiser coupler would work all you need to do is have a flywheel accept the bolt pattern for a Bravo coupler to handel the horsepower

  19. #19
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    Doctur, Faztbullet and kimbrwct1, I did a lot of research on which Merc coupler(s) would be the correct substitute based on your advice. The Sierra P/N # appears to be 18-21752-1. It is a replacement for OMC #'s 986120, 984290 and 3853917. How do I determine which is the correct shaft to match this coupler? I assume that all shafts do not have the same spline design so I will not be able to use the current shaft.

  20. #20
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    I assume that all shafts do not have the same spline design
    Ayuh,.... I'm guessin' yer assumin' wrong,....

    Just as gimbel bearin's, 'n alignment tools are all the same, every drive spline I've run across are also the same,....
    Any Grease is Better,... Than No grease at All....

  21. #21
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    Default Re: Need engine coupler for Ford 5.8L to King Cobra

    Bondo, I was not aware of that. Thank you.

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