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  1. P

    Replacing pre alpha trim ram

    A big thank you to all who replied. After considering all the comments and looking at the seals in the part # 87400A2 (thanks Jimn), I have come to the conclusion that my outdrive and rams cannot be MR. I now think that I have an even older MC-1 and it seems that if I tried to fit one of the...
  2. P

    Replacing pre alpha trim ram

    Hi All. Can I replace a pre alpha trim ram (2 hydraulic input holes at the transom end) with an alpha 1 ram (1 hole at transom end and 1 hole underneath and facing down at the other end) ? I have read somewhere that the different ram would not be compatible with my old trim pump. Is that true...
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    Mercruiser 470 Timing and Fuel grade

    Thank you.
  4. P

    Mercruiser 470 Timing and Fuel grade

    Thanks for the reply. Please forgive my ignorance but what should I be looking for with the plugs after a run?
  5. P

    Mercruiser 470 Timing and Fuel grade

    I have seen 2 different timings recommended for the mercruiser 470 engine: 8 degrees BTDC and 4 degrees BTDC. Could someone please advise what it should be set to. My other question relates to the octane rating for the unleaded petrol that is best for this engine. I am in Australia and we have...
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    Mercruiser 470 Outdrive Gearcase

    Thank you. Will do. I have a new nut.
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    Mercruiser 470 Outdrive Gearcase

    Hi. I have a 470 with a MR outdrive. The manual that I have indicates that the U joint drive gear nut should be torqued to 70 - 80 lbs. (My drive shaft has the large and small spacers between the bearings so I understand I do not have to use the rolling torque method of tightening). Can anyone...
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