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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. Lou C

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

    Sounds like a good plan…
  8. 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...
  9. 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...
  10. 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
  11. 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...
  12. 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...
  13. 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.
  14. 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...
  15. 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...
  16. 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?
  17. 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...
  18. Lou C

    4.3 vortec head torque sequence?

    You really need a shop manual. There are different torque specs depending on what version of the 4.3 you have. The old models use 65 ft lbs and you go in 3 sequences bring it gradually up to full torque (like torque all the bolts in the pattern 20 ft lbs, 40 ft lbs then 65 ft lbs). The newer...
  19. Lou C

    Mercruiser 4.3…Milky oil coming from timing cover.

    The only thing I can think of is that if the boat is stored tilting a certain way (let’s say lower on the starboard side) maybe enough water can collect to cause cracks. Also: If you look at the bottom of the pre Vortec & Vortec you see differences: The pre Vortec has a very small water passage...
  20. Lou C

    Mercruiser 4.3…Milky oil coming from timing cover.

    I looked but that service bulletin is gone from the 'net but I did find this: https://forums.iboats.com/threads/volvo-penta-4-3l-gl-j-raw-water-drain-locations-pics.559940/
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