Droll
Chief Petty Officer
- Joined
- Jul 30, 2003
- Messages
- 514
Re: 80 inline 6 questions
( Mercury #27-85653A87 )
It's always a good idea to replace the water pump when rebuilding an engine ( impeller and gaskets only IF the rest are OK )
( only some of the water exits tru the pisser ( for indication only ) , most of it escapes inside the exhaust leg )
I always uses an old barrel for water ( fills water so it's ABOVE the pump ), don't like/trust those muffs/clocks.
Steam are NOT a good sign, inspect the block closely for possible cracks ( not likely but.. )
IF the pump housing are good you can replace the impeller only ( Mercury #47-89984T4 ) , gasket are in the engine gasket kit .
Else order the full water pump kit ( Mercury # 46-96148A8 )
Arne Kjetil
ALL inline 6 build between 1973 ( +1972 140 ) and 1988 uses the same gasket kit, are some differences but todays gasket kits are a "one for all" kits .
( Mercury #27-85653A87 )
No thermostat on this engine,
Maybe, but usually #1 are the first to blow because of lack of cooling .
It's always a good idea to replace the water pump when rebuilding an engine ( impeller and gaskets only IF the rest are OK )
Should only take 2 > 3 sec before the water start running, you could try to clean the pisser hose.
( only some of the water exits tru the pisser ( for indication only ) , most of it escapes inside the exhaust leg )
I always uses an old barrel for water ( fills water so it's ABOVE the pump ), don't like/trust those muffs/clocks.
Steam are NOT a good sign, inspect the block closely for possible cracks ( not likely but.. )
- Replace water pump
- Check water intake on the lower unit ( good flow and NO obstructions )
- Replace ALL gasket in the water pump ( under and above SS plate )
- Replace the rubber ring on top of the pump housing
- Check and/or replace the rubber seal in bout ends of the water tube ( copper tube )
- And since you got the powerhead off ?? the engine, you could replace the gasket under the exhaust plate ( work your way down to the top rubber engine mounts )
- If the powerhead are still splitted you could inspect and possible do some cleaning inside it's water passages...
IF the pump housing are good you can replace the impeller only ( Mercury #47-89984T4 ) , gasket are in the engine gasket kit .
Else order the full water pump kit ( Mercury # 46-96148A8 )
Arne Kjetil
.... 750 > 800 IN gear ON water, worst case 900 > 1000 but that's gonna hurt your lower unit in the long run, especially if you're running a high pitch solid hub propeller.....