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  1. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    Oh! I was laying them down yes.
  2. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    So I tested my manifolds for leaks. Didn't have acetone but just filled the hose with water. The exhaust ports filled up with water as well after about 5 mins. Guessing that's my issue..
  3. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    The air pressure test is losing psi somewhere. I cant hear anything, smoke test didn't reveal anything. Thought maybe I could hear something in the valve cover but hard to say. I think it might be my setup, it is just a rubber ball that inflates and if I pump more then 12 psi it shoots out of...
  4. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    Numbers improved! Port 125 110 110 100 Starboard 125 125 125 120 I had the throttle closed, for these but the numbers are looking better I think
  5. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    And that's a relatively straightforward swap? I'm very familiar with carbs. I fix and flip small engines on the side and 90% of them just need a carb clean. Have an ultrasound and cleaner and everything needed. I know I'm getting ahead of myself here, should be able to recheck compression this...
  6. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    It just occurred to me that the previous owner installed a new distributor cap. He mentioned something about timing being out but he had a mechanic look at it. Wondering if that relates to my original issue.
  7. cameron92

    Can I buy a used 302 and use parts from my bad motor to convert it to marine?

    Would a Merc bolt up to my outdrive?
  8. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    Okay a smoke machine will give me much more insight then
  9. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    How long should I let the pressure test go for? And what's an acceptable loss I also ordered a smoke tester, figured it'd be good to try that as well. How would I operate that? Same way as the cooling pressure system?
  10. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    Add in a dry power steering pump as well lol. Looks like I'll be learning how to rebuild an engine potentially. There's a first for everything I guess. I guess I'll tell my wife very well unfortunately be no boat for this cottage trip :(. Unless I can figure out the issue and patch it up in a...
  11. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    Yeah it held 15 psi. It's slowly crept down over about 5 to 10 minutes but I think that was the plug I was using to pressurize the system. I had to leave town for a few days so I put a bunch of WD-40 penetrating fluid in all the cylinders. Going to retest compression when I get home. I guess...
  12. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    What's the next step if the cooling system is good?
  13. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    I figured it out I had it open going back to the drive. Capped it off and now pumped it up. It's holding 15lbs psi
  14. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    I have my pressure tester hooked up this way. That line leads to the freshwater intake. My tester has a bladder on it. If I cover my hand over where the hose came off I can hear water bubbling somewhere but no pressure holds.
  15. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    I have it hooked up to the hose that comes off this which leads to the intake on the thermostat.
  16. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    I'm not sure if I have it hooked up right but it sounds like it's coming out from under the intake manifold. I hooked my tester into the hose off of the water filter I'm assuming it is. Pump air and I can hear it around under the manifold or maybe by the bell housing. Hard to tell.
  17. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    Would that be #4 in my picture.
  18. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    And I would be pressurizing into the thermostat housing correct?
  19. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    I've never been this deep into a motor. But I don't want to be completely out of 5 grand so I'm willing to try. Seller actually sent me back 1,000 because he felt bad.
  20. cameron92

    Help! Bought a 1993 Four Winns W/ 5.0 OMC Cobra Motor and Drive - Losing power after crusing

    It actually ran and idles very well until about 3000rpm then it would die out after about 5 mins
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