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  1. Lou C

    1976 Mercruiser 165 Engine Tick & Low Oil Pressure

    Other thing you can do is hook up a mechanical gauge to see if your dash gauge is accurate. On my old 4.3 (original short block, reman heads) I get 40 at cold idle, 40-60 when running and 20 after coming off plane hot slow idle. I think I’d check with a mechanical gauge & keep using it. Also use...
  2. Lou C

    Does anyone know how this damn hose gets unplugged?

    I also had water in the oil due to blown head gaskets. The way I got it out was I carefully used a heat lamp to warm up the oil pan monitoring the heat with an IR heat gun to make sure it didn’t go over about 150 or so. If using a vacuum pump you want it warm not super hot because it will...
  3. Lou C

    Seats for Sunrunner272 ultra

    Might have to get it done at an upholstery shop… What I did on my old boat was I bought two matching helm seats from Wise where the color scheme matched the colors in the rest of the interior. Was the cheaper way to go. For the large rear bench seat (old wood frame & weighed a ton!) I used two...
  4. Lou C

    No start after cap change and wire hacks

    Yes that’s a bomb you have there. You must deal with the fuel leak first!
  5. Lou C

    Plugs fouling

    You have a 4 bbl carb. Primaries are the 2 front venturis secondaries are the 2 rear ones….go into Holley.com there are a lot of tutorials to watch. You cannot fix or tune a carb unless you know how it works. Start with Bernoulli’s law….
  6. Lou C

    Plugs fouling

    Remember the front bowl is the primary system & the rear bowl is the secondary system. In order to answer this question you need to know the model # and the build # stamped on the air horn. Then look up the specs on Holley.com
  7. Lou C

    Question on tune-up of points ignition & wire/spark plug order

    What I do....is take a sharpie and mark on the cap, the firing order and then do the same on the wires, it avoids embarrassing things like that happening.
  8. Lou C

    Twin Merc. 6.2 Mags with Bravo 3 - EMCT Temperature Overheat Fault - Port side Manifolds (Only)

    Oh my God, that pic sums up why I'd never ever own one of these! Either old school carbed I/O with wide open engine compartment for accessability or Modern 4 stroke outboard or A good condition Shamrock keel drive straight inboard with GM power, carbed of course... that's all.
  9. Lou C

    '95 OMC 5.0L fuel line

    https://www.crowleymarine.com/johnson-evinrude/parts/53921.cfm?mdl=PGHCK8 from the OMC catalog, they show it as NLA, but you can look on ebay, NLA Marine parts, etc by the part number. Or, learn how to make up a new fuel line yourself, like a brake line. here's one, see if they still have it...
  10. Lou C

    '95 OMC 5.0L fuel line

    https://www.volvopentastore.com/Fuel-Pump-And-Filter/dm/store_id.366--view_id.792209 part #8 could be it....
  11. Lou C

    '95 OMC 5.0L fuel line

    Sierra makes flex fuel line with the fittings installed, that may work for you. It's a carb engine so its all low pressure stuff. I'm pretty sure after looking at an OMC catalog most of that stuff is NLA, but because that is a joint venture Cobra (meaning that, it is the same as a Volvo SX of...
  12. Lou C

    '95 OMC 5.0L fuel line

    Not sure but doesn’t look original….what’s the year & engine you have there? With the model # on that sticker, you can then look it up in a parts catalog, & see what is supposed to be there as far as a fuel line…looks like someone buggered that up & seems to be leaking…ahh ok I see it’s a 1995...
  13. Lou C

    Plugs fouling

    A few years back I thought my QJet was too old to be rebuilt properly so I tried replacing it with a Holley 4160 that was jetted for the 4.3. Well had the same problem as the OP here. Rich running fouled plugs & calls to Holley tech support I tried everything they suggested. Finally in disgust I...
  14. Lou C

    5.0gi to 5.7 swap

    Taking a wild guess, I'm thinking that the properly flashed ECM will have the injectors stay open longer, to allow for the .7 greater engine displacement of the 5.7 vs the 5.0. If I was going to put my old Quadrajet on a 5.7 vs the 4.3 I now have, for sure I'd have to re-jet it. Keep in mind the...
  15. Lou C

    Oil everywhere

    Do you have remote oil filter mounts? Hoses OK? These are really convenient but they can leak.
  16. Lou C

    One manifold hot (5.0)

    Here's a pair of pre-vortec intakes, these are for the 4.3 but the 5.0 is similar. You can see the cross over port between the 3 intake ports. There is a matching port in the cyl head to feed in the exhaust gas. The tin cover is to prevent oil from burning off the hot cross over passage. This...
  17. Lou C

    One manifold hot (5.0)

    The idea then is to heat the area under the carb, to better atomize fuel. But, doesn't explain why the starboard side runs hotter still! I know for sure that the standard GM cast iron intakes for the Vortec engines do not have an exhaust cross over like my old Pre-Vortec does. This must be a...
  18. Lou C

    One manifold hot (5.0)

    So your thermostat housing is a different style then...
  19. Lou C

    One manifold hot (5.0)

    no EGR valve on marine engines, that I have ever seen. If your thermostat has those poppet valves, I'm wondering about them... an obvious explanation would be if those springs don't have equal tension you won't have equal flow.... see....springs, poppet valves etc...
  20. Lou C

    One manifold hot (5.0)

    from the end of your last thread, that tube that connects the intake and exhaust manifold got me very curious so I did some snooping around.... https://www.mercruiserparts.com/bam/subassembly/31842/12834/90 https://www.mercruiserparts.com/bam/subassembly/31842/12834/160 OK you got me curious...
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