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My Merc 470 rebuild

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  • #31
    Re: My Merc 470 rebuild

    For some reason the ARCO starter does not retract... Is this normal behavior? The gears are constantly on the flywheel, i know the oem starters do retract.

    Maybe its a problem with the starter?

    We installed the starter, and put power to it from the battery just to test it, it is turning the engine, but as i said.. it dosnt retract when power is off from it.

    what do you think?

    Comment



    • #32
      Re: My Merc 470 rebuild

      Engine rebuild is going along well. so far we installed the crankshaft with all new bearings, all new pistons, oil pan, timing chain, water pump, gas pump, and front cover.. All with new seals and gaskets with an extra layer of gasket sealer and locktite on seals... next we will put in the new lifters, new push rods, new rocker arms, refurbed head, and manifolds. I am painting the parts as i go along a flat black paint which is rust resistant and can withstand 3000f heat. getting there!

      I know i will eventually get into issues once we attempt to start her up... Gas pump may be bad, it seems clogged. roch 4bbl carb was rebuilt need to see if its ok, and I am still unsure if the starter will work as is.

      Comment



      • #33
        Re: My Merc 470 rebuild

        Hi Alex, and congrats on a great post & project. Like yourself I'm an IT engineer here in Australia and will soon be doing a 470 rebuild myself so I'm very interested in your progress.
        Re your starter motor, if your solanoid is not mounted directly to starter but remotely on the block you probably have the older presolite style starter (I have this one as well), and it can be changed to the delco but you will need to re-wire the solenoid.
        Cheers,
        Kev

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        • #34
          Re: My Merc 470 rebuild

          Here is a seperate post i made about the starter.
          http://forums.iboats.com/showthread.php?t=510683

          It seems this type of starter is made like this by design and retracts only when the flywheel is going faster then the starters bendix. When i tested the starter on the engine, i did it with booster cables directly on the starter with no solenoid. I do have an external solenoid i will use when we are ready to fire up the engine for real.

          We simply wanted to turn the engine over a few times with the new pistons and bearings installed, using the starter. It went fine except for the bendix.

          Thanks for the comments and feedback. I will continue to update this thread up until we are in the water with a working engine

          Comment



          • #35
            Re: My Merc 470 rebuild

            So yesterday we installed the power steering pump, alt conv kit, head, rocker arms, lifters, push rods, intake maifold, carb (we fabricated gas line from copper 3/8" tube), oil filter system with oil coolant.

            Here is a link to another thread which i asked about placement of the coolant fill cup after installing the alt conv kit with low mount
            http://forums.iboats.com/showthread.php?t=510908


            We will continue today with the other side of engine, hopfully finish up the cooling system and exhaust.

            So far so good.... we will see when it comes time to start her up.

            Comment



            • #36
              Re: My Merc 470 rebuild

              You should replace the fuel pump. If the diaphragm is bad it will pump raw fuel into the top of the carb and wash your new cylinders out causing the rings not to seat. I am new to boats but not new to engines and my 1988 470 was doing this causing a hydralock condition.

              Comment



              • #37
                Re: My Merc 470 rebuild

                We will test the fuel pump first, if tests dont pass we will replace it. We really dont want to replace parts that are not proven to be bad.

                Our luck ran out today, the gaskets we have for the exhaust riser is the wrong one... We have the cast iron exhaust manifold, while the gaskets are for the aluminum. So were on hold until the newly ordered gaskets come in. I am also missing the steel plate, so i ordered that as well.

                Today i also ordered spark plugs, cables and a distributor cap. The cables dont seem to be available from a regular auto shop, and need to be gotten from either a marine shop or online. Since the marine shops where i live totally are crap, we ordered them.

                We will use the point ignition system for now, upgrading to the electronic before we place on the boat.

                few more days of anxiety, looking at halfway rebuilt motor.

                Comment



                • #38
                  Re: My Merc 470 rebuild

                  I don't think you need the plate anymore: see 28 here: http://www.mercruiserparts.com/Show_...28CAST+IRON%29
                  There is a "stone" filter in the bottom of the fuel pump, it can be washed out and reused.
                  Terry
                  87, 4WINNS H 190
                  470/Alpha I

                  Comment



                  • #39
                    Re: My Merc 470 rebuild

                    According to the parts catalog, the steel plate is not there.
                    According to the service manual it is. And the manual states in bold letters "Gaskets and Plate must be installed as shown, or a leak will occur."

                    So things are conflicting, i will be on the safe side for now and order the plate and 2 gaskets just incase, then i will remove the riser from engine #2 and see how it was installed on there.
                    I ordered the overhaul gaskets kits, i ordered them for the SN model of my engine, one would figure you would get the correct gaskets and seals.
                    So far i am missing this gasket, i was also missing the cam seals. Had to order seperately causing days of delays in the rebuild.. it totally sucks to wait.

                    Comment



                    • #40
                      Re: My Merc 470 rebuild

                      To save you some trouble. If you look at the illustration (6B-2) you either need a) 2 gaskets & b) plate OR c) 27-97542 which is superseded by # 27-856705 (28 in the illustration, better double check those numbers LOL). So don't bother to try to find the old parts. Getting the right parts is fun huh?
                      Terry
                      87, 4WINNS H 190
                      470/Alpha I

                      Comment



                      • #41
                        Re: My Merc 470 rebuild

                        "Getting the right parts is fun huh?"

                        Its a blast... (sarcasm)

                        I just hate loosing days because of a single gasket missing.

                        Comment



                        • #42
                          Re: My Merc 470 rebuild

                          Here is a side pic of the engine, this is the fabricated copper fuel pipe we made. its not as exact as the OEM but i have more then enough room in the dog house. Plus this way keeps the fuel line away from the heat.



                          Here is a front view




                          Still a work in progress. And yes i know we didnt do very well on the paint job, but honestly i can care less about that. I only care it runs like new when were done

                          Comment



                          • #43
                            Re: My Merc 470 rebuild

                            UPDATE:

                            Another day lost waiting for parts to arrive... dam the wrong gaskets!! Hopefully tomorrow the engine will see some more action.

                            Comment



                            • #44
                              Re: My Merc 470 rebuild

                              Originally posted by alexr254 View Post
                              "Getting the right parts is fun huh?"

                              Its a blast... (sarcasm)

                              I just hate loosing days because of a single gasket missing.
                              Boy don't I know it! LOL

                              V

                              Comment



                              • #45
                                Re: My Merc 470 rebuild

                                Originally posted by alexr254 View Post
                                The boat was dry docked, on bricks for roughly one year.
                                To be honest i am not really sure what to look for in the stringers and transom. I jumped around the cabin some to see if i felt like i was gonna fall through or find any really weak spots. It felt solid. In the dog house, the only rotted part is by where one of the batteries was. I dont think the wood there is vital to the boat structure, and it can be fixed easily. Everything else seems solid and does not rattle.

                                Also with the gas tank, i am not really sure what to do with that either. This tank cant be taken out even with the engines out. I smell a small gas vapor through the fill hole, but we havent had the chance to digdeeper. I stuck in a rubber tube and blew, seems the tank is empty. Worst case i may need to have it professionally treated, which i know is not cheap.

                                much lies ahead, now i am starting to think the engine rebuild may be the easy part.....

                                Here are some pics of the boat, taken with a phone and my daughter is in them.

                                Inside Cabin ---- Starboard View
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                                Port View ---- Future Capitan
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                                Those tags are old as i am in FL

                                i will take some photos of the engines too. For now they are still pretty much to the bone, with only the block, crank, cam, and pistons installed.
                                Also if you notice the trailer... The axels were blown, i just had 2 new 3500lb torsion axels installed.
                                And once im done with the mechanics and electrical, the boat will get a new paint job.
                                This is an awesome project! Looks like a great job so far... and your future Cap'n is super cute!

                                V

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