AQD40A seized. Possible tail piece bearings?

[Justin Fisher]

Hoping somebody can help steer me with this. I picked up a 23 FT Glasply that has a siezed AQD40A 280 OD in it. 3700 hours on the motor but appears owner kept it somewhat maintained. Oil looks good. Borescoped it with the injectors out and no fractured pistons. The crank does not even wiggle. I read that these can get water in the bell housing and sieze the tail shaft bearings. When I got the boat it already had the starter off as well as the gear box that attaches the crank to the outdrive. It appeared to have alot of rust in the bellhousing as well as the bearing that's visible on the aft side of the crank ( tail peice I think). Is there a way to remove the shaft from the rear of the engine without pulling the engine all the way out? I would like to find a way to verify if that is what's holding the engine solid.

 

[spannerman]

Drive off, remove seal in shaft housing then two circlips and then the shaft will pull out, but may be rusted on the splines into the damper plate on the flywheel.

 

[Justin Fisher]

Thank you for the input, I will try to get out to the boat this weekend and take a look. I'm sure sure the splines probably are rusted into place. Any advice to get them to let loose if they are rusted to the damper plate. Spray with PB blaster and give it a few days? Maybe very light tapping?

 

[Justin Fisher]

Is there a way to remove the flywheel housing without removing the engine and or transom shield?

 

[oldgit]

Is there a way to remove the flywheel housing without removing the engine and or transom shield?

Might be able to move the engine forward far enough to get the flywheel housing clear of the transom assembly.
You can then remove the flywheel housing and inspect the interior .
If you are lucky only the hose to exhaust will need removal.
The transom assembly always remains in situ.
On my 40A with 280 outdrives the inner bearing could only be removed from the inside of the boat with the engine moved.
Bearing had completely collapsed, the inner race was rusted onto the shaft.
Heat plus a hammer and soft copper drift solved that little problem.
You can actually see the rust on the flywheel caused by the ingress of water .
Fortunately a little leverage with crowbar seperated the jackshaft from the flywheel damper plate.
If any damage to jackshaft it can sometimes be overcome without replacement or professional attention/repair.



Volvo Penta Exploded view / schematic Connecting Components AQ Drive 280 - MarinePartsEurope.com

 

[Justin Fisher]

Thank you Oldgit

 

[Justin Fisher]

Spannerman I forgot to ask. Were both circlips on the aft side of the housing? Or do I have to get access to the inside in the FWD side of the housing to pull the 2nd clip?