Trim pump reservoir failed

slag

Chief Petty Officer
Joined
Jul 17, 2009
Messages
471
Yes, I thought it was leaking since the day I got the boat, but after taking it out, its definitely the source of the oily residue in my bilge. I have heard that these older style, single bolt reservoirs will eventually spiderweb and crack at the bolt hole, especially when overtightened, however, this one had separated at the bond line and cracked on the side as well. It's almost as if it was filled with water and froze over the winter.

The oil was watery for sure and milky, and pretty low, so I drained the fluid from the lines and took the pump apart from the reservoir and cleaned it up. I can't afford at this point to buy a new pump part and reservoir that has the 4 mounting points, so I bought a cheap single bolt hole mallory reservoir off ebay last night and it should be here in a couple days.

I've read places where people say to use dexron 3 mercon ATF in the pump, and, in other places, they say to use 10w 40 dino motor oil. Which is better/best, or should I head back to walmart and invest in some of the 3 dollar squeeze tube trim system fluid?
 

picklenjim

Chief Petty Officer
Joined
Mar 11, 2009
Messages
528
Re: Trim pump reservoir failed

My Merc manuals say 10w30 or 10w40.But true I have heard of people using trans fluid. I go by the manual.
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,095
Re: Trim pump reservoir failed

Ayuh,... It's a simple hyd. pump that'll pump about Any oil you put in it,...
I use ATF...
 

Todd157k

Petty Officer 2nd Class
Joined
Jul 12, 2010
Messages
114
Re: Trim pump reservoir failed

I have read that you're not supposed to mix motor oil and ATF though. In an emergency, anything is better than nothing.
 
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