I am a fairly new boat owner, the boat was given to me as a project boat a few years ago and I have been fixing it up here and there as time and money allow. boat is a 1979 Starliner with a 120 Mercruiser 4 cylinder motor and 120 pre-alpha stern drive. the motor runs good so far (just got it wet for the first time earlier this year).
I will be attempting a water pump / impeller replacement for the first time this weekend on the stern drive unit and have a couple of questions.
1. Is there a seal that goes around where the upper and lower units come together? or is it only sealed where the gear lube flows between them? should I use any type of sealing compound around where the two meet?
2. I have the sierra water pump kit (part# 18-3317) two quarts of gear lube, gear lube pump, and a tube of marine grade grease, is there anything else i will need for this project besides tools? the service manual mentions "perfect seal" a few times but i am not sure what that is. is it like a gasket sealer? I do have an automotive grade spray on gasket sealer would this work?
3. Do i need to have it in forward gear before separating the upper and lower units? the service manual only mentions putting it in forward gear when putting them back together but I have read conflicting reports here on the forums.
Sorry for all of the question but the service manual is a little vague in some areas.
and I wanna make sure i do it right the first time.
Thanks for your help.