Mercruiser Pre-Alpha Trim Pump Replacement?

[auscarter12]

1971 Aristocraft with a Mercruiser 165 Pre Alpha/ Just discovered this week that my trim pump will no longer work in the UP/OUT position. The solenoid clicks and the motor makes a noise, but it will not push any fluid. I checked the fluid level, have taken the pump out, cleared the lines, and still no luck. The part number on the side of this trim motor is 45060A9. It is the original trim pump with the square metal resevoir and one solenoid. Does anyone know what the direct replacement is for this pump, or can anyone point me in a direction of which pump will work to replace this even if it isn't the exact same one? Thanks

 

[alldodge]

The old pumps have different pressures form the new style. Your is here
http://www.mercruiserparts.com/bam/subassembly/30832/1574/120

Which uses a reverse lock valve.
Is it only the up and out or also the trim up button?

 

[auscarter12]

AllDodge The buttons work going up and down. The solenoid clicks both ways. I have taken the pump completely out of the boat and given it power. It will spray fluid in the in/down direction but no fluid comes out in the up/out direction. Just spits a little bit even with a full reservoir.

 

[alldodge]

The in/down or up/down means the same thing to me. So if you trim up or down the drive will go up and down. The up and out is when the drive needs to go all the way up to put on a trailer. The up and out is the same as up only, the difference is how far it moves.

Might be your reverse lock out valve causing the issue

 

[Pete104]

The solenoid is for the "up circuit" only. That motor turns very slow for "down". There is no solenoid. Single wire from down switch to the pump motor. You could take it (the motor) to a starter/alternator repair place and go with that. At least get an estimate. Or step into the '80's & eliminate the rev valve plumbing and some other modifications, install a current oil-dyne style pump be done with it.

 

[fishrdan]

There is no "new" direct replacement, only used pumps. You can make an Oildyne pump work, but it requires a couple brass fittings and some cobblin, and you have to find a place to mount the pump.

An Oildyne pump has the reverse lock valve built-in, so you need to by-pass the transom shield mounted reverse lock valve. I made this conversion on my 72 Mercruiser, took the reverse lock valve out of the loop and routed the hoses: Trim pump > manifold > trim sender > trim pump. I was rebuilding everything at the time and used all high pressure Mercruiser trim hoses, omitted the low pressure thin nylon tubing. For the reverse lock valve, it needs to remain in place for the shift cables, so fill it with oil and plug the ports.


If you can find a used pump that would be the most hassle free, but it would be a 30-40 year old pump.... My old pump was still working fine when I removed it, so you never know. $50 for a used pump or $300-400 to convert everything over to a new Oildyne....

 

[auscarter12]

fishrdan The more I think about it, the more I wonder if the reverse lock valve has something to do with it. I have been having issue with the motor not getting spark and with it stalling randomly, so I'm beginning to think something is off with that reverse lock valve/shift interrupted linkage back there. I'm going to check that next. Can you or anyone else provide clarification on how the reverse lock valve works? My manuals give a sort of bland overview and no good photos.

 

[alldodge]

The lockout valve is mechanical and must be adjusted. The link below is for boat info but right now it appears to be off line. Try later and look under Mercruiser and manual number 4 or yet again probably manual 6. Cannot get in right now to verify

http://boatinfo.no/lib/library.html

 

[Pete104]

Both shift cables connect too it at the cable ends, not the adjusting barrels. When shifted into rev the valve hydraulically shuts down the the trim "up"system. In theory. They originally had a switch that was wired into the system (2 blue wires) that stopped current to the motor when shifted to rev. Thats a single noid. Then they went 2 noids & adjust pointer to the 3rd mark on the outside marks while in rev. With it adjusted properly the pump will labor up or down with control in rev. If the pump will still labor in neutral for up then tap the down button to relieve any unneeded pressure right there. And it should be somewhat normal for 40 yrs. Reverse is always slow on both systems.

Hope that helps