Pump issue

[Bowhunter3125]

Git an 84' 50 hp I just installed in my boat. Hasn't running almost 6 years but I got it to fire. All seems well except that it wont pee in idle in neutral. The moment I throttle up it will pee and if I put it into gear, even at idle it will pee. Is this normal? I was told it was normal because if a thermostat. New to this size of motor.

 

[racerone]

As soon as the motor starts it should pee !!------Install a new impeller now.----Thermostat has nothing to do with the pee stream at all.

 

[Rick Stevens]

As soon as the motor starts it should pee !!------Install a new impeller now.----Thermostat has nothing to do with the pee stream at all.

Agreed,,,,,,,,,,,

 

[Bowhunter3125]

Ok, have to find someone local to do it for me. Seals may need replaced as well, got oil coming out the prop

 

[racerone]

A 84 Mercury 50 HP may not even have a thermostat.------Impeller is easy to replace if you want to learn to save $100 / hr charges.

 

[The Force power]

Ok, have to find someone local to do it for me. Seals may need replaced as well, got oil coming out the prop

This may not be "gear-oil" but fuel/oil mixture

 

[Bowhunter3125]

So I tried to remove the lower unit, removed all 5 bolts, drops about 1/4" then it stops. Friend suggested it may be the drive shaft sticking but he was unsure how to proceed.

 

[Scott Danforth]

read the factory service manual, it will tell you the procedure and why it only drops 1/4"

 

[Bowhunter3125]

read the factory service manual, it will tell you the procedure and why it only drops 1/4"

Tried that, the manual covers a vast array of years, all it talks about is removing the bolts. I'll figure out I guess.

 

[Scott Danforth]

you need the drive in forward to allow the shift linkage to come apart. that is covered

 

[Bowhunter3125]

So, found a couple videos and articles on line, all said the same thing, the grease on the drive shaft splines gets old and hardens, almost like a glue. Everyone has had to turn the motor upside down and spends days spraying degreaser down the shaft and let it soybean away at the grease.

 

[racerone]

Don't think so.--------If it came down 1/4" the driveshaft is not stuck / seized.--------Perhaps some plastic wedges and a bump from a small mallet will get it apart.-----Forward / neutral / reverse does not matter either.

 

[The Force power]

The nut under the trim-tap has been removed?

 

[Bowhunter3125]

The nut under the trim-tap has been removed?

yeah, the trim tab, the one under it,mt he one just back from it then the 2 on the side. I am curious as to why, whoever had it off last, used permatex rtv on the seem between the lower unit and main housing.

 

[Bowhunter3125]

Don't think so.--------If it came down 1/4" the driveshaft is not stuck / seized.--------Perhaps some plastic wedges and a bump from a small mallet will get it apart.-----Forward / neutral / reverse does not matter either.

i am gonna make some wood wedges, that way i know the wood will go before i break the housing.

 

[Bowhunter3125]

Still ain't got the lower unit off. But I was advised my mark at Mark's mercury in Salem that because this motor was used in saltwater, the shaft is more then likely rusted in. He suggested to drill a 1 inch hole in the middle housing just down from the head unit then spray the shaft several times a day with pb blaster. May take a week to get it lose.

 

[racerone]

Put the lower unit back up to within 1/8" of the exhaust housing.----Couple of nuts will hold it in place.-----Put the muffs on and start it up.----Vibration / shaking will likely loosen the rust.------Run for 5 minutes.