Volvo AQ131 trim drooping

[Drewboy]

I have a Volvo AQ131 engine, purchased new in my Glastron in 1990. The issue is that the trim won't stay up, it trims up, but then "droops" back down. I have read that this can be caused by piston blow by in the pump. Can it also be caused by low level of oil in the pump? I haven't noticed any signs of leakage.

This pump has the reservoir built into it, with a thumb screw approximately half way down on the pump. I assume that If I check the oil it should be to the bottom of the threads, correct? What I don't know is if the outdrive should be trimmed all the way up or down- I have read both.

Also, does anyone know what type of oil to use? The service manual I found online from Volvo didn't list fluid spec's.

As a side note, I had the trim hoses replaced last year by my mechanic, could it be related to that? Air in the lines?

If it is a problem with the pump, should I just replace it, or can it be rebuilt? It looks like the current replacement model is #3586765.

I know it's a lot of questions, but I appreciate the help.

 

[Don S]

Re: Volvo AQ131 trim drooping

Check the oil in the reservoir with the drive all the way down. It should be level with the bottom of the hole. You should check to see what kind of oil is actually in it. Many had ATF, but they are supposed to use engine oil, either will work, just don't mix types.
After filling, run the drive up and down a few times to bleed it out, and make sure the level is still ok, then see if it leaks down on you.

 

[Drewboy]

Re: Volvo AQ131 trim drooping

Thanks, Don. As an update, I lowered the outdrive, unscrewed the thumbscrew, and pressurized air and some oil Blew out of the hole. The oil is dribbling out of the hole, so I put the screw back on, trimmed it up, and will see if it holds.

Should pressurized air blow out of that hole?

Thanks!

Andrew

 

[Drewboy]

Re: Volvo AQ131 trim drooping

So, the fluid level is ok, I raised and lowered the drive numerous times, and it still sags back down.

Would I now assume that the pump is the issue? Can they be rebuit? Is their a reliable source for used/and or remanufactured pump/motor combos? I believe the current p/n is 3586765, but am open to any alternatives that aren't going to cost a fortune.

Thanks!

P.S.- glad I found this fourum- great info.

 

[Drewboy]

Re: Volvo AQ131 trim drooping

Anyone have an idea?

 

[Drewboy]

Re: Volvo AQ131 trim drooping

Help- I don't want to replace a $500 pump if I don't have to. Any thoughts?

 

[Don S]

Re: Volvo AQ131 trim drooping

Raise the drive up and block it so it won't come down.
Then remove both lines one at a time and cap the line.
Then remove the blocking. If the drive still drifts down, the cylinders are bypassing internally and need replaced. If it holds, replace the pump.

 

[Drewboy]

Re: Volvo AQ131 trim drooping

Thanks Don! I'll try tomorrow.