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Thread: Major Service on a Merc 90 3 cylinder 2 stroke - what's needed? Power Head removal??

  1. #16

    Re: Major Service on a Merc 90 3 cylinder 2 stroke - what's needed? Power Head remova

    Just found my original notes from the conversation with my regular outboard mechanic who is old school but always does a good job. He said you need to remove the powerhead to replace all the cooling system gaskets as they only last 3-5 years. Also all the seals, the gearbox and exhaust gaskets and the lower crank shaft seals. He said that any switched on mechanic would tell you this needs doing at a Major Service. Having said that the mechanic at Holt marine (Merc Dealer) says they used to do this in the 70's but its no longer required. This is also what I have heard from another dealer now and they point to changes in the way the Motor was made etc

  2. #17

    Re: Major Service on a Merc 90 3 cylinder 2 stroke - what's needed? Power Head remova

    In any case, powerhead removal is about a 15 minute job.

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