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    Removing Old Mounts from Bellhousing - 470

    Evening folks, I'm taking on this job next week and removing the mount bushes on my 1986 boat. Any tips and tricks for getting the old bushes out ? I have read that they can be difficult. I will be removing the bellhousing completely as need to put it on the new motor if that helps ? TIA
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    470 Crank Pulley Installation - the last half inch

    Hi All, I am putting the pulley back on the block and the last 1/2 inch is getting very stiff. What kind of rachet is required in terms of length of shaft - is this a job for a strong arm or regular ratchet ? Im trying to get an idea of how much force is required to get it back on. Thanks Rake
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    Yamaha F6 Not Peeing

    Hi All, I have a 2004 F6 and I recently changed the impeller and she ran fine and pee'd well. She has not seen any use except for periodic warm up and she recently stopped peeing. When the engine is then turned off I can hear air either leaving or being sucked in to the pee hole for a few...
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    Merc 470 - someone spilt the bucket with the pushrods lifters and rockers in

    Well I left the tray with the above parts in my garage and it got tipped. No way of knowing what was where. Refit or other options please ?
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    470 - Oil Pump Alignment ?

    Hi All, Im rebuilding my 470 and dont have this alignment tool. Is there any other way to install the pump and ensure alignment ? Thanks
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    Mixing Notched and Un notched pistons ?

    Hey. Im rebuilding my 470 which needed one piston. The others do not have the notch in them. I've been in touch with falcon global who sold me the piston and they advised that all pistons now have the notch and that the notched can be used in combination with un notched. Is this true and ok...
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    Yamaha 2004 F6 Shift Assembly Question - Impeller Change

    Hi All, I am having issue with re connecting the brass nut that connects to the lower unit threaded shift shaft. When I present the lower unit shift shaft to the brass coupler, it will not thread back on, I feel resistance followed by a clack sound as the coupler turns the whole shaft up...
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    Preventative Head Gasket Replacement and more - 470/170

    I found me a 470 with only 66 hours on it, its a 1978 build and I plan to fit the boat with it and take the boat to a remote location in Greece so wanted to do the nasty bits before taking it over. Its been sat in a shed for the past 25 years so I plan to do the following ? Later alloy exhaust...
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    Does engine rotation matter to an outdrive ?

    If I was to replace a clockwise rotating engine with a counter clock - would the same outdrive be ok to use ? Does engine rotation matter to the outdrive or will the same out drive cope with either rotation ?
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    Merc 470 Head Gasket Failure Root Cause ?

    Hi all, I am troubleshoooting or trying to identify the root cause of the head gasket failures on these engines. an engineer friend is asking What's the core problem though - lack of heat extraction, air bubble formation due to hotspots, gasket failure, head lift? Any info on this ? where and...
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    Any Rochester Carb Experts around ?

    I have a Merc 470 with 2 barrel 2GC fitted, When rebuilding the carb I noted that there were no main well tubes under the venturi - Did this model have them in the first place - if so what effect will it have not using them ? Also, this is the electric choke version, there is no vacuum...
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    Low hours 470 Engine ?

    Hi all, I have a Draco 1800 fitted with a 1978 470 motor of unknown history and hours. I've fitted the later alloy exhaust manifold, new elbow, Pertronix ignition, alternator upgrade, new sierra starter, and rebuilt the carb and 4 inch HE she has never given me much trouble aside from an...
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    MC1 - Cant select Reverse.

    Hi all, Still having issues with reverse a year on and wanted to recap and sanity check what can be done to determine if its the shift cable adjustment, shift cable wear or if I have a lower unit problem. So to recap, We have an MC1 Sterndrive coupled with a 470 motor. Forward selection is...
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    Pre alpha - Cant get reverse no matter what I do.

    Help required in a last stitch attempt to fix this boat please. So, recently it becomes hard to get reverse. Symptoms are as follows - Shifting from forward to Neutral - remains in gear till I pull the control a little into reverse past the notch then it shifts to neutral and I notch it again...
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    Pre Alpha Forward / Reverse / Neutral Issue

    Hi All, I seem to be having a problem with F/N/R on my pre alpha 1977 MC-1 style drive - the one with the pre load pin. I think the cables have stretched as when I try to go back to N from F, I have to go into R an inch or so to get it into N. Sometimes it does not engage in reverse until the...
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    470 Overheat or Wild Goose Chase ?

    Dear all, I have been chasing an overheat on my 1977 470 for two years now and I might have been on a wild goose chase all the while. Boat - Draco 1800ST 5.6M LOA Drive 1:84 Pre Alpha Engine 1977 Merc 470 with Aluminium Manifold Kit / Riser / Thunderbolt ignition / Alternator / 4 inch Heat...
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    1977 MC-1 Single Impeller Blade Pointing Worng Way ?

    Dear forum, I have on ald dog of a drive that is giving me some greif. It over heated last trip out so I inspected the water pump only to find a single blade pointing the opposite direction to all the others. Replaced with a top half kit and impeller and the other day I ran her dry by...
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    Pre Alpha Leaking Oil from Water Pickups

    Hi All, My drive is driving me mad. I see oil stains south of the water pickups on the drive now. I realize this must be seals but which ones and how to replace ? I changed the impeller again due to overheat and found oil in the water pump housing too. One of the impeller vanes was facing...
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    Exhaust Gasses emerging from rear of Prop

    Hi All. Whilst the MC-1 was in the bucket the other day I noticed the bubbles of exhaust gas coming from a 1 inch crack on the top of the OD casing just behind the rear edge of the prop. Is this a problem of major proportions or can it be left ? Any help useful here. She is overheating again...
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    MC-1 Lower Unit - Advice needed - found filler and small leak.

    OK guys, this is gonna be painful I am guessing. I was rubbing down my outdrive in order to paint her up and noticed a tiny weep of oil on the lower unit just behind the pickups towards the transom. A little further rubbing revealed a blob of white filler / epoxy / ??? something apparently...
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