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  1. Lou C

    Mercruiser ECM replacement?

    I’m still seeing it at an angle like my old pre Vortec… I think that given the difficulty in finding the correct ECM a carb engine would be easier. The OP might have to find a shop that caters to American classic & muscle cars to get a marine carb set up right. Seeing as how it’s a Merc an...
  2. Lou C

    Mercruiser ECM replacement?

    The one on the right is for sure a Vortec as you said; what makes me think the OP’s is a pre Vortec is the tin cover for the choke stove. Nothing like that on a Vortec. We ate like forensic detectives trying to figure this out lol!
  3. Lou C

    Mercruiser ECM replacement?

    It’s a pre Vortec for sure like I thought. First the Vortec bolts go straight down not at a angle and second I see one of the extra bolts near where the choke stove would have been if it had the Quadrajet. You can see the tin cover that covers the choke stove opening with a bolt in it and below...
  4. Lou C

    Mercruiser ECM replacement?

    A better pic of the intake with the wiring harness not covering the bolts would also help..
  5. Lou C

    Mercruiser ECM replacement?

    Don’t think so where did you find this #?
  6. Lou C

    Compression test 180 and 160

    Compression test results can vary for a lot of reasons, engine should be warmed up throttle valve open. Normally the 4.3 tests from 160-170 in my experience, but gauges can also be off. Mine has never been lower than 160 or more than 175. Carbon build up can also raise comp test results. As long...
  7. Lou C

    Re-upholstery Job on Cruisers Yacht 338 Bowrider

    Can’t wait to see the finished product!
  8. Lou C

    Electric power steering

    alldodge I can’t answer your question but know of someone who might…go over to www.allpar.com And post up your question the user name of the member is Imperial Crown. Very knowledgeable….
  9. Lou C

    Question about water circulation in closed system

    For your closed cooling system you need to make sure the raw water side of the heat exchanger is drained, as well as the raw water hoses feeding it, the impeller, and exhaust elbows (if you have a full system the manifolds are on the closed side but the exhaust elbows are on the raw water side...
  10. Lou C

    Mercruiser ECM replacement?

    Yep and when they are all dried out I like to coat the outside of the connector with dielectric grease.
  11. Lou C

    Mercruiser ECM replacement?

    Well I might want to open up those connections and see if there is any corrosion!
  12. Lou C

    Blue Sea Add a Battery

    No I didn't because I'm sure the starter draws more than 90 amps.
  13. Lou C

    Mercruiser ECM replacement?

    when you say only 235 hrs since new, is this engine original to the boat? Then what year is the boat? To me the boat looks too old to have a TBI system, it looks mid to late 80s. BTW I like a clean engine but I'd never use a pressure washer around a wiring harness! you don't want to be forcing...
  14. Lou C

    Mercruiser ECM replacement?

    https://www.rapidomarine.com/default.aspx?p=/sbc_casting_numbers.aspx this might help...
  15. Lou C

    Mercruiser ECM replacement?

    Looking over the pix I'm pretty sure that this is a pre-vortec TBI engine. The intake looks more to me like the pre-vortec style so that puts it as 1995 or older. Can't answer the question of flat tappet or roller cam without the casting # or seeing a pic with the intake removed, if that tin...
  16. Lou C

    Blue Sea Add a Battery

    https://www.crowleymarine.com/mercury-outboard/parts/16591_20.cfm looks like on their new V6s they are still using a 90 amp fuse on the starter circuit....
  17. Lou C

    Blue Sea Add a Battery

    Interesting and one thing I have noticed in looking at wiring diagrams…Merc has a fuse at the battery connection on the starter solenoid whereas Volvo & OMC did not. I have read reasons why the starter circuit shouldn’t be fused (safety concerns of not being able to start the engine in an...
  18. Lou C

    5.7l carburetor choices

    For Quadrajet tuning questions try asking on Cliffs High Performance Quadrajets…if your original QJet is in good shape it can work just fine they were used on everything from a 4.3 to a 7.4 due to the flexibility built into the original design. PS right now you can’t even get new Edelbrock...
  19. Lou C

    Mercruiser ECM replacement?

    PPS looked again and I saw the tin cover over the area where the choke stove would have been if it was a carbed engine, definitely a pre-vortec. The vortec manifolds do not have an exhaust cross-over so there would be no place to mount a thermostat choke spring as on the pre-vortecs (used on...
  20. Lou C

    Marine oil VS Standard Synthetics

    The actual advantages with a full syn would be in temperature extremes of cold and heat, most likely the cold is not a factor in marine use, however, heat can be, as far as oil temp. However, if you look at what Merc recommends the most they will recommend is their Syn Blend 25/40 which is the...
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