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  1. J

    Can I change Alpha1 Gen1 lower gimbal swivel pin needle bearing to later Alpha1 bush?

    Hi All Have an 86 Alpha1 Gen1 outdrive and the lower gimbal steering pin needle bearing is shot. Mechanic says engine needs to come out and take off transom assembly to restore. Retired on meagre resources so am looking for a cheaper quicker way to get around the problem. Eg can I access the...
  2. J

    Correct installation of thermostat?

    Hi tailwind 67 - thanks very much for your reply to my old question on thermostat housing assembly order. I have tried both A and B and at this stage my engine is still overheating (original problem see my other post) with no water flow off to the manifolds all water flows off to the elbows...
  3. J

    Correct installation of thermostat?

    Hi All I have a 1985 GM/Mercruiser 5.0L raw water cooled. Replacing the thermostat (and housing) but have come up with two completely different assembly methods for the thermo and sleeve and sealing rings. Please check the attached diagrams and can you confirm A or B is correct?? Also my T...
  4. J

    1885 5.7L weak water supply to circulation pump

    OK thanks all for lots of inputs on my overheating problem. 1. Just to clarify my boat is a 1985 (not 1885!) Mercruiser/GM 5.7L with an Alpha 1 outdrive. Sorry if I posted in the Mercury MerCruiser Sterndrives & Engines forum. Can someone let me know the best forum category. 2. Several experts...
  5. J

    1885 5.7L weak water supply to circulation pump

    UPDATE. I think I have solved the problem. Plan was to check the leg impeller and supply line output at 1500rpm before getting the leg off for new impeller and hoses etc. Anyway when I did the 1500rpm test on muffs the impeller supply was great with the offtake hose getting around 10" spurt...
  6. J

    1885 5.7L weak water supply to circulation pump

    Maybe this video link works?? https://www.dropbox.com/s/6blm3qx1w76inm5/2022-03-01%2011.24.06.mp4?dl=0
  7. J

    1885 5.7L weak water supply to circulation pump

    Hi All History of overheating on my inboard Mercruiser 5.7L 1985 model. Put on new elbows and checked water flow thru the manifolds and its good (garden hose conn to lower input port and water flows fully out the two ports on top of manifold - it is a dry joint type) OK so put it all back...
  8. J

    Right side idle relief water outlet port blocked

    Hi All Just about ready to re-assemble my exhaust (new elbows). During water flow testing down the exhaust Y pipe I found that the right side idle relief port is blocked. This port did not discharge any water when running on muffs before this maintenance session. Have tried inputting high...
  9. J

    Alpha1 350 raw cooled boils and ticks rapidly after short time on muffs

    Hi Tank1949 - I have restricted gaskets on my elbows, the restricted hole is just under the cooling water supply hose IE to the front of boat side. Yes I have sea water cooled system and no heat exchanger. My current theory on the overheating is that it may be rust scaling and restricted flows...
  10. J

    Alpha1 350 raw cooled boils and ticks rapidly after short time on muffs

    REPORTING BACK. OK guys great suggestions thanks to all for your thoughts - today I changed the cooling hoses back to the way they were originally AND ENGINE RAN COOLER. Of course the hoses no longer send hot water to the manifold lower inlets, and the cool water is going up to the elbows. So...
  11. J

    Alpha1 350 raw cooled boils and ticks rapidly after short time on muffs

    Sorry the video does not seem to load on to this site - it was just a shot of the water gushing out of the leg/impeller feed during cranking. Pretty sure the leg water feed is OK esp since mechanic fitted replacement about a month ago. Below is recent history of the engine re running temps all...
  12. J

    Alpha1 350 raw cooled boils and ticks rapidly after short time on muffs

    Hi All - thanks for all the helpful replies. Yesterday I disconnected the leg raw water supply hose and cranked the motor - impeller pump was going well. Next I ran the garden hose in to the same hose and filled the block till water ran out the inspection plugs at the top of the elbows...
  13. J

    Alpha1 350 raw cooled boils and ticks rapidly after short time on muffs

    Hi all - my 1st post. Have a 1986 alpha1 5.7L which has recently had a new impeller (mechanic fittted) and a new thermostat (me fitted). During the thermostat fitting I discovered that the upper cooling hoses were wrongly connected so rectified IE t-stat cover outlets to bottom of manifolds...
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