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  1. Brentathon

    Alpha Swivel Shaft Seal - Which way???????

    I'm trying to figure out which way the swivel shaft seal gets installed on my Alpha Gen I, and I've seen descriptions stating "lip up", and the diagrams seem to show them with the lip facing up; HOWEVER, that is the opposite way you would think to install a seal, being that it's trying to stop...
  2. Brentathon

    Water Temp Warning switch for Merc Alpha?

    Aside from the Mercruiser Temp warning switch, can anyone suggest an alternate Temp switch and warning horn for my Merc 5.7 Alpha? Possibly a good aftermarket setup?
  3. Brentathon

    Merc Alpha Swivel Shaft, Bushing, Seal Info???

    I'm trying to look into the details of what parts are required to replace my Merc Alpha Gen I Upper Swivel Shaft Seal, and the exploded parts list seems confusing. Does anyone have detailed knowledge of this particular job? -Since I have no grease fitting on the top of my gimbal housing, does...
  4. Brentathon

    Overheating Issue - SOLVED!!!

    After trouble-shooting my high-rpm overheat for weeks ('91 5.7L Merc), I finally found out that it was the after-market Sierra brand impeller in my Alpha One drive (that I installed over the winter). The Sierra's impeller vanes have a significant set in them, and the rubber is much harder than...
  5. Brentathon

    Cannot solve Merc 5.7 high-rpm overheating

    I?ve been trying to solve my high-rpm overheating problem for weeks now. So, the marina is pulling my boat out of water to check/replace O/D impeller (even though it?s probably fine). Other than checking that the pickup inserts are flush with the drive, and checking the intake hose from bell...
  6. Brentathon

    Merc Service Manual #15, 90-816463

    This manual doesn't appear to be in the list with all the others. Does anyone know where you can download this, or does anyone have a copy?
  7. Brentathon

    Merc Alpha One Swivel Shaft Seal

    My swivel shaft seal leaks (where steering lever goes through transom); does anyone know the details of the job to replace this seal via engine removal (i.e. parts to disassemble, approx # hours, etc.)? Most people do not want to try the procedure of drilling the access holes in the top of the...
  8. Brentathon

    Power Steering cooler insides???

    In trying to fix my puzzling high-rpm overheat issue on my 1991 Merc 5.7L, I stuck my finger into the powersteering cooler, and it felt like there was an inner pipe section approx 3/4" diameter, and I was expecting the little "tubes within a tube" type of heat exchanger design. Has anyone looked...
  9. Brentathon

    Super-Puzzling Overheating Merc 5.7 - Need Help

    My engine temp has been creeping up when cruising, while the steady-state temp at low RPM's is fine. At one time, temp even crept up to the "red zone" (15 sec), before coming back down when I backed off throttle. I noticed this temp creeping toward end of last season, too, but this heat wave...
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