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  1. J

    Will Alpha1 Y pipe fit my upper plumbing?

    Hi All My boat has a V8 Mercruiser 1985/86 mated to a Gimbal Housing using the old 3 piece Y exhaust with strange bolt hole configuration. I have been told my G Housing (badly worn steering shaft bearings) is late 70's by a parts supplier per pics I sent. Of note is the G Ring does not have...
  2. 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...
  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

    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...
  5. 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...
  6. 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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