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  1. L

    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    Thanks, I've used lots of hydraulic equipment in the past (and we all have PAS on cars) and I can understand a bit of squealing but this sounds kind of half squeal half grating, I wondered if there was a problem with the connection between the motor and pump or some an internal problem with the...
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    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    Thanks for the tips Lou. I'd prefer to address the pump first because I can't access the pump with boat interior trim refitted but can access the rams, and I don't know if it's the pump/rams/both that need fixing. That said, if I knew it was the rams at fault I could fix them with the parts...
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    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    Kit 3854397 just contains O rings, no hard parts. I looked at the Marineengine.com site and added all the O rings that kit 3854397 contains to 'my basket'. Some of the original parts are no longer made but in most cases there is an equivalent part that is available. I compiled a list of part...
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    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    I looked at the link you sent, part #65 is 3854247 which does match the part number on my marina's website, so would you agree the marina I contacted has the correct kits to rebuild my rams? I've been researching pump rebuild kits, knew I'd watched a Michael Romer video rebuilding the same...
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    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    I emailed a marina to ask if they could supply a rebuild kit for my rams and pump (and sent them pictures of my rams and pump). This was their reply... Hi Simon, Im afraid the ram seal kits are the only item we can help with, we have no supply for the end caps required...
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    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    Thanks. I did a bit more reading and it seems lots of these rebuild kits are aftermarket with complaints about quality. Maybe they're all aftermarket if OMC no longer exists? 2 Rams so would I need 2 of these kits? I might ask a hydraulics company like this...
  7. L

    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    I found this on Ebay, does it look like the correct parts to you? https://www.ebay.co.uk/itm/314922204566
  8. L

    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    I can buy rebuild kits for the SX rams but I haven't seen any for the Cobra rams. Don't think I've heard of BRP, could be a problem getting hold of the Cobra parts. Is my pump (pictured above) standard SX? I read that someone's rams didn't need servicing for 35 years, my rams don't look in...
  9. L

    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    Thought my trim hydraulics were fixed after I changed an O ring on the pump, the drive did stay up over night when I test fitted it a few weeks ago. But now the drive is back to falling slowly again, no external leaks so the problem must be inside the rams or the pump.. But which? 1995 OMC...
  10. L

    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    Thanks. When I was looking at buying a replacement prop I looked at one that might have been 14 x 21, the seller told me the 1/2" less diameter wouldn't make much practical difference. Is that true?
  11. L

    Need to determine best prop for weird setup

    Why did they change prop sizes in 69?
  12. L

    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    Thanks, I understand the prop should allow the engine to reach max rpm etc. I would have a good idea what to expect from a change in pitch if I knew a baseline (good engine and good prop) but my engine and prop were both bad when I bought the boat, I just went on marina advice and cost when I...
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    Need to determine best prop for weird setup

    iIrc both motors (Evinrude and Merc) would be around 60/70 hp. But all OMC stuff used bigger props than Merc stuff. I know there's a difference in prop to cavitation plate and gearing but they were design choices by OMC/Merc respectively, my question is about what the trade-offs are between prop...
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    Need to determine best prop for weird setup

    Thanks, I think I get most of that, but why do manufacturers choose (say) a 14.5" diameter prop instead of (say) a 10" or 18" diameter prop and change gearing/pitch for similar(?) results? I've wondered about this since my dad's boating days when I was a kid and noticed my dad's Evinrude engine...
  15. L

    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    Fitted the drive on Friday evening, removed the drive drainplug and dipstick. My 13x2mm drive socket wouldn't fit in the level plug so I left the drive fluid draining for a couple of days. Today I bought a big screwdriver and undid the level plug, used a little pump to refill the drive from the...
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    Need to determine best prop for weird setup

    What I'm getting at is how should size/weight/design of boat and (say) engine rpm and torque / hp dictate drive gearing and prop size. Merc or OMC gearing / prop wouldn't be best suited to the Titanic lol, it obviously need much bigger props, but why couldn't a smaller OMC or Merc prop be turned...
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    Need to determine best prop for weird setup

    Not trying to take the thread off topic, Mercury outboards always had smaller props than Johnson, obviously with different gearing to suit, but which is most efficient at low and high speeds (small prop spinning faster or big prop spinning slower)?
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    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    5 US qts = 10 US pts = 4.16 imperial qts = 8.26 imperial pints, so going on those figures if I pumped 9 pints out of my engine I was only overfilled by 0.7 pints (0.35 qts) yet my dipstick showed I was overfilled until I pumped 3 pints out. This is one of the reasons why I wanted to make sure...
  19. L

    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    Thanks Lou. I pumped the oil out of the engine today, main reason being I wasn't sure how much I'd put in it because I part filled it before fitting the engine then ran the oil pump with the oil pressure sender disconnected and pumped some oil onto the ground in the yard. I removed 9 British...
  20. L

    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    Thanks, I got the drive fitted but it did seem more difficult than last time I test fitted it after cleaning everything up. I may have made a mistake though because I didn't wait for your answer, fitted it with triple guard over the O rings... maybe that was why I also struggled a bit to get the...
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