Jack shaft bearings ?

[K-2]

I'm not sure if I got the name right(?) The shaft that connects flywheel to U joints on out drive.
When I pull my out drive, DP-A behind a AQAD41A, the male splined shaft that you can see in the middle of the
transom shield,,,the bearings are shot.
I have always heard the engine must be removed or slid forward to get at these bearings.
A while ago I read that it is possible to come out the back with the shaft & bearings and not have to move the engine,,,,,
"If you are lucky" it said.
Anyone ever do it this way? Moving my engine(s) would be a night mare.

 

[captmello]

Re: Jack shaft bearings ?

Connecting Components Drive Unit Sp-A, Dp-A, Dp-B AQAD41A, AD41A, AD41B - 7745630 - Volvo Penta

According to the Volvo parts website, you're not that lucky.

 

[K-2]

Re: Jack shaft bearings ?

We are looking at the same parts schematic,,,,,but I'm not seeing what you are seeing.
I don't see that the spindle #79 and bearings #81 & #84 and that whole assembly can not come out the back.
Remove outdrive then remove #67 , what would keep it from coming out the back?
What are you seeing in this schematic that tells you it must all come out the front? I'm not being argumentative and I thank you for the reply.
Maybe the bearings are a press fit into #75 the flywheel housing? I have never had any of this apart before .
Thanks

 

[captmello]

Re: Jack shaft bearings ?

I apologize, I may be incorrect. What I saw was the two bearings. However the parts diagram shows both sets of bearings going in from the back side, not from the engine side, so you may be correct. Its a bit frustrating, because the OEM engine manuals don't match the parts diagram for some of these engine/outdrives. While I do not have the oem manual for your engine, other motors matched to the SP-A outdrive, V6 and V8 motors, show the same setup as yours in the parts diagram, but do not show that type in the engine manual, if that makes any sense. The engine manuals all just show the two flywheels covers I'm familiar with, one and two bearing types. The two bearing types they show in the engine manuals are the type that need to come out completely, not because you couldn't pull the drive shaft out the back, but because the inner bearing and seal would still be in the housing.

Sorry to misinform, perhaps someone else with experience with those type of flywheel housing can shed some light on the subject.

 

[K-2]

Re: Jack shaft bearings ?

The more I think about this I see reasons to move the engine forward and remove everything that way. The schematic we have been looking at does not show the parts that are in the flywheel housing that the drive shaft goes into.
There is that shock absorbing doughnut thing that Volvo calls a clutch. Also a few bushings that I assume can wear.
I don't think any of this has been apart since 1989 so it's time to take it all apart and make it right.
When I removed the outdrive in late September I could move that shaft around easily, up & down or side to side , that's what led me to believe the bearings (at least) were shot in that drive shaft assembly. Thanks!

 

[captmello]

Re: Jack shaft bearings ?

Ya, Don S used to yell at guys trying to do the PDS Bearings without pulling the motor and flywheel cover together, and doing the bearings on a bench. When I did mine, I pulled the motor and left the flywheel cover in the boat. The motor is an easy pull on my boat.

I still think you will want to remove the shaft out the back of the boat, but you will need to drive it out from the engine side.
Looking at the parts diagram, it has the same configuration as mine, with the exception of the bearings both being installed from the rear. I don't think you will have any bushings etc in the area of the vibration damper (clutch) to worry about.

From the rear of the boat, with the upper gear box removed, remove the outer seal (#80), then the big snap ring (#82) just behind where the seal was, then there is another snap ring (#82) in front of the first bearing (#84). those two snap rings are tough.
Once those two snap rings are out, the PDS (#79 - primary drive shaft) should be able to be driven out from the motor side. The outer bearing (#84) along with snap ring (#83) should come out along with the PDS.

You are correct that the bearings are press fit and will require some creativity on your part when you install the new bearings. You will need to drive them in without damaging them. You'll see what I mean when you get there.

Let us know how it goes. I'm very curious about how the inner bearings (#81) are installed.

 

[K-2]

Re: Jack shaft bearings ?


The boat was pretty much built around the engines. Unfortunately.
Can I leave the engine where it is and remove the outdrive,transom shield then remove the flywheel housing ?
I have room to slide the engine forward but pulling it is not an option. The pic of the cabin interior shows what is above the engines,
a bunk and counter top. Also the boat is in Alaska, and I won't be there to work on it until April. Now I am trying to figure out how I am going to do it and order all the parts I will need.

 

[billbayliner]

Re: Jack shaft bearings ?

 

[K-2]

Re: Jack shaft bearings ?

Now I get it.
Thanks Billy

 

[captmello]

Re: Jack shaft bearings ?

Now I get it.
Thanks Billy

Glad you do...It sounds like the inner bearing needs to come out the motor side. Is that what you're thinking? If so you're going to need to move the engine at least 8-12 inches forward.

Regarding the parts, I always like to pull things apart first. However I understand your situation.

FWIW, when I did mine, I only needed the two seals and the two bearings for the flywheel housing repair. Other parts you'll want are new bellows, orings between the upper gear box and the intermediate assembly, and since your in there you may want to replace the ujoints as well.

 

[K-2]

Re: Jack shaft bearings ?

Yes, that's what I'm thinking.
Probably the cheapest Volvo Penta parts I have ever bought, but by far the hardest to put in.:joyous:
Thanks everybody for the help, I'll let you know how it turns out. Happy Holidays!