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1990 vs 1992 4.3 block swap

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  • Got all pistons in. New rings installed. New double roller chain which is very tight, but I believe will stretch anyways. One cylinder head down with the bolts sealed. Need to get another permatex tube. 0.2oz lasted only for one side.
    1990-4-3-century-2000-floor-transom-stringer-upholstery-project

    https://forums.iboats.com/forum/engi...4-3-block-swap

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    • I got a small problem. The dipstick has a hole. It is right where the block had cracked and it must have sprayed water on It for some time. What can I do to fix this? Are there tubes available that can be formed? The GM one is for the car and bend differently. I may be able to repurpose the one fron the car and make it work.
      the elbow is probably on its last leg and a good thing I looked into it as well. I could mill across and get a nice squared face again
      1990-4-3-century-2000-floor-transom-stringer-upholstery-project

      https://forums.iboats.com/forum/engi...4-3-block-swap

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      • buy a new dipstick tube from mercruiser
        Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

        1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

        Past Boats
        1970 Wooster Hellion - Merc 9.8
        2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
        1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

        What’s behind you doesn’t matter.Enzo Ferrari

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        • Originally posted by scott danforth View Post
          buy a new dipstick tube from mercruiser
          nla...
          xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
          The world takes on a whole new perspective when viewed from 100’ below.
          1972 Bertram ‘Bahia Mar’ 20
          2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
          (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


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          • I found some that are +$100. fleabay wants $80 for a used one. No way I spend that much on a piece of tubing. I figured I get either 3/8 copper tubing or get on mcmaster carr and get some thin walled steel tubing for $20 and make one myself.
            1990-4-3-century-2000-floor-transom-stringer-upholstery-project

            https://forums.iboats.com/forum/engi...4-3-block-swap

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            • Originally posted by Chris51280 View Post
              I found some that are +$100. fleabay wants $80 for a used one. No way I spend that much on a piece of tubing. I figured I get either 3/8 copper tubing or get on mcmaster carr and get some thin walled steel tubing for $20 and make one myself.
              if its a tube that goes to a fitting in the bottom of the pan, easy to make

              if its a tube that gets pressed into the block, its a bit more difficult

              you either need to make sure the tube goes all the way to the bottom of the pan so you can extract the oil, or you need to install a remote drain hose

              remember, oil dip-stick tubes are flared where they press into the block

              you can also acid dip your current tube to clean the rust, then patch it by soldering a section of copper tubing over the hole.
              Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

              1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

              Past Boats
              1970 Wooster Hellion - Merc 9.8
              2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
              1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

              What’s behind you doesn’t matter.Enzo Ferrari

              Comment


              • Here is what i did. I filled the oil pan with 4.5 quarts and it turns out it is the exact level to the baffle. This equals to about 4" from the pan rail.
                I drilled the hole open with a 3/8 drill bit since the original tubing was at .365".
                I got myself 3/8" tubing and matched the old tube as good as possible. I made the 90degree radius a little bit bigger so the dip stick has an easier curve to follow since the old one had a bigger diameter in that area.
                then I made sure that the bottom of the tube is very close to the bottom,of tve oil pan which was about 8.5".
                I checked with the dip stick in the tube where my full line is with 4.5 quarts of oil in the pan and cut the beginning of the tube.
                the only thing I don't have is the garden hose adapter. I can still get a 3/8 tubing over the dipstick tube and suck it out this way.
                i will use a little rtv to seal the gap between the tube and hole
                1990-4-3-century-2000-floor-transom-stringer-upholstery-project

                https://forums.iboats.com/forum/engi...4-3-block-swap

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                • you could simply braze the tube to the block there
                  Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

                  1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

                  Past Boats
                  1970 Wooster Hellion - Merc 9.8
                  2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
                  1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

                  What’s behind you doesn’t matter.Enzo Ferrari

                  Comment


                  • Not sure if my skills allow for that. Lol. Its already a tight fit and pretty sturdy. Don't think it will go anywhere.
                    1990-4-3-century-2000-floor-transom-stringer-upholstery-project

                    https://forums.iboats.com/forum/engi...4-3-block-swap

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                    • Ok. Installed oil pan and offline oil filter. Filled up oil and tested the pump with the left over distributor minus the gear. I attached the drill to it and turned it clockwise. Then I forgot to plug the oil pressure sensor. What a mess. After it was plugged I checked that all my rockers get oil pumped. All good
                      1990-4-3-century-2000-floor-transom-stringer-upholstery-project

                      https://forums.iboats.com/forum/engi...4-3-block-swap

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                      • 1990-4-3-century-2000-floor-transom-stringer-upholstery-project

                        https://forums.iboats.com/forum/engi...4-3-block-swap

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                        • Ayuh,....... Lookin' Good,.... Can't wait to hear it Roar,......

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                          • So it looks like an engine again. It is slower now and I have to check my pictures to see where some of tge wiring goes.
                            I also rebuild the mercarb yesterday with help from MadProps .
                            my question is, what is the center power valve for? How does that work with the air horne? With the plunger sitting on Top and depressing the needle, more fuel gets into the engine, correct? When,does the needle,close and what makes that plunger retract?
                            1990-4-3-century-2000-floor-transom-stringer-upholstery-project

                            https://forums.iboats.com/forum/engi...4-3-block-swap

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                            • Vacum operates the plunger ... high vacum means throttle is not open very much, little to no vacum when at WOT, valve opens up to riches the mixture as needed for full power

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                                Exhaust manifold is on. Carb is on and the choke works again. It was stuck open when I got the boat. More wiring finished. New spark plugs are in.

                                So what is the latest on the gasket between the manifold and elbows? Some said leave it painted, some said to take the paint off. The gasket material is graphite. I think I will put some aviation gasket between the exhaust and water jacket. I know it says to install dry but what does it hurt? The sealant can withstand 400f and will not dry out.
                                1990-4-3-century-2000-floor-transom-stringer-upholstery-project

                                https://forums.iboats.com/forum/engi...4-3-block-swap

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