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FYI, the term is "Duo Prop", and if a Volvo Penta shop is NOT aware of the great performance benenfits of the "Duo Prop", then move on to another shop, because they obviously are not servicing them.... therefore it is doubtful that they could advise you!Hopefully there would be nothing that I or my son would have to deal with. The 2 boat dealers we've talked to weren't very positive about a dual prop-----and I've always preferred to work on my stuff my self. One was a Volvo service place, one wasn't.
I have some experience with hypoid gear sets and rolling torque bearing adjustments.
Mark, yes it is!So is the drive on this boat an AQ drive??
In 1993, this could have been a DP-S, or one of the AQ series Duo Prop engine/drives.
According to the photos, this is one of the last AQ series, of which is what I work on.
Hey Rick, don't you wish we got to work on boats that clean, that have never seen salt!!!! That's a beauty and one of the last of the REAL sterndrives.
Mark, make sure to pull the steering helmet back and check the bellows area for water, while you're there, have a look at the water intake nipple.
Look at your engine/drive model numbers, and visit this site.
Open up a view schematics, and read some of the part descriptions. There will be some variances.
This will help you familiarize yourself with the drive.
Yes, all three upper gears are turning when the engine is running.Let's see if I have this figured out. The reversing is done in the upper gear housing------is it a friction clutch of some kind or is it a splined or dog collar that engages one of two bevel driven gears driven by the drive bevel gear. By the way, the comment that my son took away from the Volvo/Penta dealer was that there were twice as many seals and bearing to give you trouble with the DUO-prop drive. How often are these a problem----especially in a fresh water only boat?? The only parts I've had to replace on my 33 year old Mercruiser have been the U-joints and bellows once (that's not counting props).