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Recent content by Dieter

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    Alpha 1 Gen 1

    1991 is the first year for Gen 2 going into production. I had a 1991 Sea Ray that had (by serial number) one of the last gen 1 drives made, assuming the engine was made in 1990. Serial OD 469859 and up is Gen 2 if the OP can read the serial number
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    Alpha 1 Gen 1

    As Kghost points out, if your WOT RPM is in spec 4400-4800 or so (your version of the 3.0 could be 4200-4600) then you can probably drop to a 15" pitch and have similar performance. Would be good to know what you had in terms of RPM. Not that you have to keep it at WOT just if it can get to...
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    Sealant or No Sealant?

    Dry
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    Alpha 1 Gen 1

    go down in pitch about 2" from what you were running with the 1.98. The 1.84 has less gear reduction so you need a lower pitch prop to try and compensate. Issue will be if yo were already running a 15" or 17" prop you may run out of available pitches . If you were running a 19" drop to a 17"...
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    Alpha 1 Gen 2 upper drive shaft seals?

    I used red loctite form a gasket to lightly coat them. not 100% sure it is required
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    Mysterious Milky Oil - Not Risers...

    Looks like water has been coming in for a while by the amount of corrosion in the ports. Pressure test the engine at best you will need new or reman heads, worst case new engine. is this a salt water engine ? they tend to rot behind exhaust valves or if over heated can crack there. Pressure...
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    When should you replace the Gimbal Bearing?

    I always talk nicely to my bearing before install.... Seriously to OP removal all the old grease you can, if solid it may be sign of water intrusion... Spin the bearing while you grease it to expel all the old grease whip off any excess in there as that can insulate the bearing. Be happy...
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    Alpha One Lower Unit

    Mako has it. The cav plate is not made for that kind of load. The hydrofoil manufacturers leave that out of the sales pitch. I had a cheap plastic two piece (two bolt holes on each side of the plate) foil on my alpha gen one years ago. It definitely helped planning until it snapped the cav...
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    When should you replace the Gimbal Bearing?

    Hard to tell from here, by irregularity’s what do you mean rough? I usually grease mine while idling on the muffs to get grease through out the bearing. Would think no it doesn’t need replacement but you want to turn it while greasing to make sure fresh grease gets in
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    Alpha One Lower Unit

    Very common for welding shops or prop shops to tig these back togther on the boat with out disassembly. Ditch the hydrofoil. That’s why it broke.
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    5.0 hi swap

    Do you mean a marine 5.0 TBI on a 5.7 or a truck TBI? Do not use anything electrical or fuel related from automotive or truck application. Marine rated componenets are required for fuel and electrical systems.
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    5.0 hi swap

    Yes if you strip it to the long block , swap in marine head gaskets, brass core plugs, and a marine water pump. Then use all your marine accessories off the old motor. Marine cam cam came out of old motor or use the truck cam, just dont use a car cam If you have a carbed engine would definitely...
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    RPMs drop then raise when going into gear

    Unless you can hear which one is noisy no remove the belt check and see what doesn’t spin freely. Can also be rust on the pulleys.
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    RPMs drop then raise when going into gear

    Not sure that would bother me that much, would be more concerned about the squeaking. What do the volts do when you see this happen do they drop? Assume the captains call draws some current? Is the noise a rough alternator?
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    Mercruiser 3.7L (470) inboard help

    They offer them on many of their engines, i didn’t check specifically for the 3.7, might be worth a call
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