125 aq volvo penta slipping?

[Steve Cagle]

alright, i have a problem with my outdrive i think. when im going straight at whatever speed, the something dont slip, but when im at planing speed and turn the rear starts shaking and slipping soon as i straighten it up it catches and goes on, when im a lower speeds i can turn all the way without problem. also the trim works out of the water but when in the water it trims but as soon as it goes into gear the whole outdrive drops down. dont know if the two are causing eachother or what. any help would be greatly appreciated. thanks steve, the boat is an 1983 bayliner 125 aq volvo penta 4 cyl.

 

[PiratePast40]

Re: 125 aq volvo penta slipping?

Welcome to the forum. First step is to head up to the "Adults Only" section above and download the maunal for your drive.

It sounds as though the u-joints are bad and most likely the PDS bearings are shot as well. When you're going straight and at low RPM, you're lucky enough to not have enough vibration to shake the boat apart . When you're turning, the bad u-joints and bad shaft bearings are beating the heck out of themselves, each other, and probably the snout of the flywheel cover. It may be cracked as well.

You don't have "trim" on that outdrive - you have a tilt mechanism that should only be used at idle or with the engine off.

Sorry for the negative prognosis, but that's what sounds most likely. Best bet is to remove the upper gear box and start looking around. If it's any consolation, you're not the first!

 

[Don S]

Re: 125 aq volvo penta slipping?

What drive do you have? The AQ125 is an engine, there is also an A and B model.
Your outdrive could be either a 270 or a 280, which?
With either, it sounds to me like you have a ujoint problem also, probably caused by water in the bellows and rusy ujoints, possibly water in the gear lube too.

There is a section up in the Adults only sticky that shows how to remove the upper gear box to get to the ujoints and bellows. The gear box is really easy to remove.

 

[captmello]

Re: 125 aq volvo penta slipping?

Welcome.

Along with the info you've already received, You should look at this link.
type in AQ125 in the 'Engine type' box and read up on the info there.

http://www.volvopenta.com/volvopenta/global/en-gb/marine_leisure_engines/parts_service/publication_search/pages/publication_search.aspx

the outdrive is going down because it has a built in clutch so the lift mechanism doesn't get ruined from improper operation.

Like Don said, you'll have to begin by pulling by pulling the upper gear box.

 

[Don S]

Re: 125 aq volvo penta slipping?

but when im at planing speed and turn the rear starts shaking and slipping soon as i straighten it up it catches and goes on,

If you are making sharp turns, the prop could be coming out of the water.

 

[Steve Cagle]

Re: 125 aq volvo penta slipping?

sorry, the drive is a 270 b, and didnt know about the trim being a tilt mechanism. i have had the upper gear box cover off and the u joints are loose as a goose, but i will jump on that and get them replaced.as far as PDS bearings im clueless as to where they are, but i will get that download on my drive.the vibration/slipping it does both when i turn at plane speed and the boat slows down like a tranny slip and the motor revs up but when i turn back straight it catches and does fine? thanks to you all ,yall have been more help than you can imagine.its hard to find any one that knows something about boats where i live.thanks again Steve

 

[captmello]

Re: 125 aq volvo penta slipping?

as far as PDS bearings im clueless as to where they are

after you pull the upper, you'll see the end of the PDS, primary drive shaft that connects the engine and outdrive.

pull the upper, reach in and move the drive shaft, if there is any movement, left right, in out, then PDS bearings are also bad. We've all done 'em.

Let us know what you find.

 

[Don S]

Re: 125 aq volvo penta slipping?

With a 270B drive, you do not have trim, only tilt. The force of the prop thrust will push the drive to full down and locked position.
The PSD (I'm guessing that stands for primary drive shaft, never heard of it called that before however) is the shaft in the flywheel cover and your flywheel cover probably has a single bearing. Not hard to change once you get the engine out of the boat.
It still sounds like the prop is coming out of the water in a sharp fast turn.