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    outdrive info

    trying to find info on these two merc outdrives..particularly the gear ratios. One ser# is 4787657, and the other is 6152290. Thx
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    holes in vent plate

    Hello everyone! On a recently acquired lower merc unit, there are some holes drilled thru the vent plate where the previous owner had a whale tail mounted. The boat that im putting it on has trim tabs, so the whale tail wont be used. Will having those holes there affect performance? Im...
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    water pump kit?

    Hello everyone! Im posting today because I have a question about water pump kits. Heres my situation...im looking online to find the correct kit for my outdrive, which is I believe either an mr or an alpha,an early one,possibly 1978-1980. I found the proper kit to match my year which is glm...
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    lower unit interchangbility

    Good evening everyone. I am wanting to change my mc-1 lower unit,which is a 78, with another unit that i have aquired. The new one i have is either an MR,or an alpha 1. Is this pretty much a matter of just bolting it up? Of coarse, i would do some maintenance on the one going on,just wondering...
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    Shift cable kit misc parts

    Hello everyone. Just have a question about some mystery parts that came with my lower cable kit. Kit came with 4 O-rings. One of them was for the water intake on the bell housing and its accounted for. The other three I didn't come across during the install. The only other O-rings I saw were on...
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    bilge ventililation

    hello everyone. I put up a post similar to this awhile ago. I am posting pics of the setup this time though. Is this setup for my bilge correct? The last time I posted, I resieved varied answeres. I am mainly concerned about my side vents...Should the louvers be facing towards the bow, or turned...
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    shift spool replacement

    Does anybody have any experience in checking and replacing a shift spool? 1978 mc-1. Just wondering whats all involved in the job. Thx
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    shift cable bellows positioning

    Good evening everybody. So I recently replaced my lower shift cable,and am buttoning up the job. All went well, definatly a 2 person job. Anyways, I am at the point where im ready to crimp the small bellows clamp in place. Is there a general rule of thumb as to what position the bellows should...
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    prop shaft movement

    Hello all. So when I stand behind my merc mc1 outdrive, I can grab the prop and there will be some in and out movement of the prop shaft. Is this normal? And if so, how much throw is too much throw? Thx
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    Excessive play in mercontrol shift box

    Evening guys..Anybody ever had an older mercontrol shifter apart? Are there any replacable parts in there such as detents etc? If possible I would like to get a more positive feel out of it.
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    pre-alpha shifting issue

    Hello all! Love this forum btw:) I am having some shifting issues and was wondering if anyone has any techniques for isolating whether or not its my lower shift cable, or something deeper. Forward is no problem, but from N to reverse is giving me problems. I followed the adjusting instructions...
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    Anybody have a 1978 century boat,or know about them?

    Hello all! I am desperately looking for advice on the proper set-up for my bilge ventilation system. The one I have has obviously been tampered with.
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    PROPER bilge ventilation please!

    Hello all! I am concerned about the ventilation system on a recently purchased boat. I have a 1978 century 5000,sterndrive. The setup that's existing goes as follows..I have a blower on the back of the transom. Adjacent to that is an unpowered hose hanging down along side the blower. I also have...
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    Intermittent thumping sound when in reverse

    Good morning everyone! I have an issue with my 1978 alpha one. When the throttle is in forward position, everything seems fine. But when I shift into reverse, im getting an intermittent clanking or thumping sound . Prop turns. Can anyone lead me in the right direction? IM thinking could be...
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    1978 mercruiser 228 exhaust

    Hello everyone, new to the forum. A month ago I purchased a 1978 century 5000 with a mercruiser 228. After doing some general maintenance , I took her out for a test drive last week. Ran good, but noticed that my transom was getting wet. From what I seen, the only place it could be coming from...
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    1978 mercruiser 228 exhaust

    sorry, wrong forum
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