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  1. Lou C

    Volvo Penta 7.4 overheats

    https://www.nlamarine.com/products/volvo-penta-3850935-3855695-cobra-sx-lower-unit-gearcase-1-66-1-97-4-3l-v6-sx-m?variant=19784692334689 Here's some pix, not sure if this is the same as yours, but it looks like the water passage can be accessed by removing the cover with 4 bolts. I'd be very...
  2. Lou C

    Volvo Penta 7.4 overheats

    That irregular o ring should be replaced each time you pull the drive; I coat it with marine grease to hold it in place while reinstalling the drive. While you’re at it check the driveshaft bellows carefully. If you need to split the drive I have a trick for that job! I'm still thinking your...
  3. Lou C

    Volvo Penta 7.4 overheats

    That’s why I said to test it by taping over the water intakes and backfilling with water via the raw water intake hose. This is described in Volvos documentation on troubleshooting overheating. Post # 20. Like I said earlier I’d suspect Maine growth in the water intake area and possible rotted...
  4. Lou C

    Exhaust pieces and parts

    https://www.marinepartsexpress.com/VP_Service_Bulletins/158%20%20%20%20%20%20%20%20%20%20PB%20P-25-1%20%20N2%20%20%20%20V-01%20%20%20%20%20Exhaust%20pipe%20seal%20obsolete.pdf it isn't dated but I think this happened around 1999 or so.
  5. Lou C

    Volvo Penta 7.4 overheats

    The plastic ones, don't really go bad unless someone let the water in the raw water circuit freeze and then it cracks. The Cobra I have owned 20 years I have never had to replace it, I have a few spares just in case though ;)
  6. Lou C

    Trailer surge brakes

    I've had the free backing drums for nearly 20 years and never had trouble backing up, the only troubles I've had is the wheel cyls seizing up and the same with the adjusters. Found a way to make both last longer so I didn't have to change to disc brakes. The last set I installed have the...
  7. Lou C

    Volvo Penta 7.4 overheats

    tape over drive water intakes with duct tape tilt drive up disconnect raw water intake hose at impeller housing have a helper watch under left side of pivot housing pour water in hose and see if it leaks out the left bottom part of the pivot housing, if so then it's probably cracked. The pic of...
  8. Lou C

    Exhaust pieces and parts

    I found my one of melted ones in the exhaust outlet in the transom mount, the other was still on the pin that fits into the Y pipe. I had to pull the drive to get access and pulled the other melted one out with a 3 jaw grabber tool. With the drive removed I was able to see it looking through...
  9. Lou C

    Exhaust pieces and parts

    They may come up as unavailable on the Volvo parts site because Volvo put out a service bulletin basically saying they didn’t think they were helpful & they can melt and block the exhaust if the engine overheats. So they recommended not replacing them. However the parts are still out there...
  10. Lou C

    Penta 4.3 GL in saltwater?

    Some Volvos have the heat exchanger mounted horizontally some have it mounted vertically on the starboard side. The 4.3 is quite compact shorter than a 4 cyl or V8 but as wide as a V8. They are pretty durable the main things to watch are leaks from the intake gaskets (Vortec) and exhaust...
  11. Lou C

    Penta 4.3 GL in saltwater?

    If you wanted to add closed cooling you would have to assess the internal condition of the engine by removing the thermostat housing & front circulation pump so you can see what the cooling passages look like. If you see light surface rust, ok, but if you see flaking cast iron, I would not add...
  12. Lou C

    Valve seal replacement on 4.3

    My pleasure & good luck with it!
  13. Lou C

    Valve seal replacement on 4.3

    Yep those manifolds look like new. Get the heads checked out (magnafluxed). Clean and examine all sealing surfaces
  14. Lou C

    Bought a house on the lake! Got to get the old boat up and running.

    Wasn't that a Chris Craft? IIRC
  15. Lou C

    Valve seal replacement on 4.3

    I'm not seeing anything there either, how about the exhaust manifolds?
  16. Lou C

    Valve seal replacement on 4.3

    I’m not seeing a clear sign of a leak with the intake so I’d carefully check the exhaust manifolds esp on the side where the piston tops looked steam cleaned.
  17. Lou C

    Valve seal replacement on 4.3

    The plugs don't look lean, from what we can see, also if it's a 2004 Sea Ray then it should be a Merc rigged 4.3 and by then, it should have had the dry joint manifolds & elbows so I wouldn't expect water leaking back into the cyls to be that likely at all, unless either one rusted out. Fresh...
  18. Lou C

    Valve seal replacement on 4.3

    This looks like a reman engine due to the .020 stamp on the pistons indicating that it was bored .020 but what's more concerning to me is the flecks of something in #2 cyl (front cyl on the starboard side) of something (aluminum?) and 2 scratch marks on the cyl wall. Also what's the flaky...
  19. Lou C

    SX outdrive

    the boat looks immaculate! great work!
  20. Lou C

    SX outdrive

    https://www.michiganmotorz.com/evinrude-johnson-triple-guard-grease-8-oz coat the mating surfaces with this grease and it won't seize up there again, also coat the driveshaft splines with it. I've used it extensively in salt water and never had a problem pulling the drive and my boat sits in...
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