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  1. Lou C

    Alpha 1 gen 2 5.7L overheating

    I recall thinking of this when I I stalled the temp sending unit in the intake (had to clean up all the rust & paint) so what I did was thread it in to see about how deep it threads in. Then I just used a bit of Evinrude gasket sealer on the threads at the very end of where it threads in to...
  2. Lou C

    Alpha 1 gen 2 5.7L overheating

    The reason why the raw water flow test should be done in the water is that the hose water pressure can mask a weak impeller.
  3. Lou C

    Exhaust manifolds

    I installed Barr Marine (made in USA) on my 4.3 five years ago and so far so good. Just give ‘em atop coat of Rustolium becaus if you’re in a damp climate they will get surface rust a a season or 2. Remove any paint from the sealing surfaces for the manifolds & elbows and check flatness with a...
  4. Lou C

    4.3 merc water in #5 cylinder

    The sealant is a good idea if either the cyl head or the manifold is pitted on the sealing surfaces. I recall when the Vortec engines were introduced on both the V8s and V6s in GM vehicles there were a LOT of failures resulting in antifreeze getting into the cam valley & motor oil. Eventually...
  5. Lou C

    4.3 merc water in #5 cylinder

    Go back to your pic of the engine with the intake removed. As I pointed out earlier there is suspicious rust deposits on the cyl head near the intake port for that rear cyl and the rear water passage in the cyl head. The intake gaskets on the Vortec engines were more failure prone than the Pre...
  6. Lou C

    New Engine Replacement - Engine Died and Hydro locked after 5 hrs!?

    Depending on how much tolerance you have for more hydro locks you could just change one thing at a time to answer the question what was the cause. So if the flapper solves it totally you know it was back wash/stern of boat too low if not then it’s solved with adding the vacuum break valves...
  7. Lou C

    Ideal Mercruiser 350 cu.in. running temperature?

    While temps vary I found that the part of the engine closest to the dash gauge temp is the intake manifold right below the thermostat housing. I find that it reads approx 10-15*F cooler than the dash gauge. Try taking it there is still way off your sending unit & gauge may be mis matched or...
  8. Lou C

    About to do my first VP SX outdrive service and have a few questions

    As long as your bellows is in good shape & that bearing carrier does not have any corrosion on it grease will make the seal for you. My old Cobra has the same set up & no leaks in 19 years of moored/6 months salt water use. I would however: When you grease the D/S splines don’t get it in the...
  9. Lou C

    Has anyone seen or heard of a trailer tire doing this?

    Don’t buy cheap steel belted radials. If you want cheap tires for a trailer IMHO you’re better off with a bias ply tire. I’ve had 3 sets of Kenda Load Stars and not one failure in 17 years. As soon as I see cracks I change em like at 7 years or so. A steel radial when the steel belts delaminate...
  10. Lou C

    New Engine Replacement - Engine Died and Hydro locked after 5 hrs!?

    Sounds like a good plan…
  11. Lou C

    New Engine Replacement - Engine Died and Hydro locked after 5 hrs!?

    Well given the problems you've had I probably would. See the thing is we don't know if it is mostly reversion, mostly back flow or a combination of the 2. So if you add that vacuum break valve (I can't believe VP charges $95 each for them!) and the exhaust flapper you have both possible causes...
  12. Lou C

    New Engine Replacement - Engine Died and Hydro locked after 5 hrs!?

    that looks like it might work. As far as how water gets into the engine, keep in mind there are really several sources....the engine while running has to have a steady flow of cool water pumped in by the impeller, naturally this gets exhausted 100% out the elbows, BUT, if reversion is happening...
  13. Lou C

    New Engine Replacement - Engine Died and Hydro locked after 5 hrs!?

    yes, there are also idle relief ports in the bottom of the transom mount where water exits at idle but at sped most comes out that tube
  14. Lou C

    New Engine Replacement - Engine Died and Hydro locked after 5 hrs!?

    https://www.volvopentastore.com/Intake-And-Exhaust-System/dm/store_id.366--view_id.768638 part #5, same for v6 & v8 as are the elbows. you don't have an exhaust bellow that's an exhaust tube. remove the tube & replace with a flapper, if it fits ok over the tube & won't come off you could do that...
  15. Lou C

    New Engine Replacement - Engine Died and Hydro locked after 5 hrs!?

    https://waterskis.com/exhaust-flap-3-3-5-4/?msclkid=d3b901ee3fd11ba4481a63b68f1f8cf3&utm_source=bing&utm_medium=cpc&utm_campaign=S%26O%20%7C%20Water%20Skis&utm_term=4587918426699680&utm_content=GSAPI%205fe220553bc01 something like that, to prevent water from washing up the Y pipe. Does your...
  16. Lou C

    2002 volvo penta 5.7 Liter idles but stalls when throttling up

    They are pretty easy to rebuild and tune, they have been using the same basic modular design for more than a half century and have very good aftermarket support.
  17. Lou C

    New Engine Replacement - Engine Died and Hydro locked after 5 hrs!?

    V/P decided to remove them in '99. There was a service bulletin, saying they were not effective in preventing hydro lock and can melt and block the exhaust if you overheat the engine. The latter statement is true not sure about the former, I have the same flappers in my '88 4.3 and never ever...
  18. Lou C

    New Engine Replacement - Engine Died and Hydro locked after 5 hrs!?

    Don't know what video that was, but...here are a few other things that V/P has done to combat exhaust reversion after the Vortec engines came out. Due to the changes made in them they were in certain installations more prone to reversion, which is when a vacuum develops in the exhaust system and...
  19. Lou C

    2002 volvo penta 5.7 Liter idles but stalls when throttling up

    Questions: does this engine have a proper water separating fuel filter? Is there junk in the gas tank? Is the accelerator pump functioning?
  20. Lou C

    New Engine Replacement - Engine Died and Hydro locked after 5 hrs!?

    When it hydrolocks is it random or is it only when decelerating? In addition to checking for other signs of water intrusion (cooling system air pressure test) there are are a few other things: One thing I’m wondering about the cam grind used on that engine, is it definitely a marine grind or a...
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