1999 Johnson 90 hPa trim pump leak

[Macca1500s]

Hi all how does Tis sound, I had my boat serviced , it's new to me so I always pay the professionals to do a full service before I get carried away using it

Anyway when I got it back from the mechanic he asked had the trim system been leaking, as the boat is new to me I couldn't say either way

So on getting it home I noticed it was in fact leaking, I could have called up the mechanic but at the risk of having to pay more money I thought I would investigate myself

The previous owner had replaced the trim pump motor and apparently re used the o ring seal as there was a new one in the side pocket of the boat

So ah ha I thought I'll swap out the seal as it appeared that there is where the oil was leaking

So today I dug into it, trimmed the motor up fully, flipped the stay into position, released the manual release screw

And removed the trim position switch, I reckoned there was enough slack in the trim motor cable to allow me to remove it

Moving along I saw that the trim oil fill cap screw driver slot was fairly knocked around so decided to make sure I could remove it before going any further

When I did, there was a huge amount of air pressure escape then a significant amount of oil maybe a pit more than half a cup

My understanding is that with the Rams fully extended you fill the oil close it off and the up and down the trim a few times to bleed it, continuing the process till all the sound of air has gone and the system works smoothly

So I took out the motor mounting screws but couldn't move the motor, I started to think of getting something to tap the motor, but then thought ,I wonder if the mechanic serviced the unit on his bench and over filled it

So I put it all back to gather and went through the process of filling the oil and bleeding.

And early days yet and I may be kidding myself but no leaks

So I wonder if being over filled it was presurizing it's self and the oil was forcing it past the seal

How does that sound. Reasonable???

 

[Macca1500s]

Ok been sitting for a couple of hours now, I've gone out a few times and powered the trim up and down, no leaks

Tomorrow will tell

 

[Chris1956]

Pressure an build up in those units, if they are not properly bled.

I would doubt the mechanic looked at the PTT unit, as they want to do the minimum you would accept, which is likely plugs, timing and gear oil.

 

[Macca1500s]

yep i agree but in this case one of the trim rams had started to spit out a seal, protruding from the assembly, so he had to fit a seal kit

also he cleaned the corrosion (minor) off the unit and repainted it, he,s generally very good

but having done what i have done its not now leaking , so i can only assume he over filled it

 

[boobie]

Keep on checking it the next few days and see what happens.

 

[Macca1500s]

Thanks , will do

 

[Macca1500s]

Oh well good try by me, still leaks but now I know it's the pump motor mounting and not the Rams.

So I guess I have to take it off and do it properly

Last time I couldn't get the motor off, I removed the 4 bolts and it didn't seem to want to lift off, is there a step or rebate
And do I just have to try harder or gently prise it off

Thanks