Removal of AQ170 engine.

[Waffu Chief]

I need to replace my engine and the manual says this can be done by removing bell housing bolts to enable you to slide engine out.
I am doing this whilst boat is still in the water.
Have removed all bell housing bolts with engine supported by boatyard crane but can only withdraw it half an inch. Am I missing something or is the drive plate corroded to outdrive splines?

 

[Scott Danforth]

not sure what manual you are reading.

the factory manual says remove the drive, undo the 6 bolts that clamp the PDS in place and remove the engine and PDS housing (this would leave a nice large 6" diameter hole)

when was the last time you had the drive off for bellows change and u-joint inspection? most likely the u-joint spline is corroded to the PDS. in that case your only choice is to remove the outdrive

I wouldnt do it while you are in the water. wont take much to ruin your day and have the boat sink.

 

[Waffu Chief]

I bought the boat before last lockdown and on first use the engine faltered. On inspection found head gasket had gone and water ingress had caused hydraulic action on a con rod. Until now not had any dismantling by me.

 

[Scott Danforth]

that seloc manual is going so sink your boat. get a factory manual. the amount of misinformation in a seloc manual is staggering

at best, you can use it for knee pads, to prop up the corner of a couch. at least it would make emergency toilet paper in an outhouse.

pull the boat on the hard
pull the drive
pull the motor and PDS

you probably need to rebuild the PDS anyway
doubt it was the head gasket that went, normally other things go.

 

[Waffu Chief]

that seloc manual is going so sink your boat. get a factory manual. the amount of misinformation in a seloc manual is staggering

at best, you can use it for knee pads, to prop up the corner of a couch. at least it would make emergency toilet paper in an outhouse.

pull the boat on the hard
pull the drive
pull the motor and PDS

you probably need to rebuild the PDS anyway
doubt it was the head gasket that went, normally other things go.

Somebody in their wisdom knew there was a problem with overheating and removed the thermostat the head gasket must of deteriorated over time to the point where when I throttled up it was enough to finally blow it. I think your advice is the only way ahead, lift the boat and pull the drive. Just one word of ignorance, what does PDS stand for?

 

[Scott Danforth]

Primary Drive Shaft. the "bell housing" on the AQ series drives is known as the PDS housing.

to remove the drive, pull the shift cover off the drive, disconnect the shift cable, disconnect the helmet use 1/4-20 screws (or 1/4-28 dont remember) to drive the helmet pin out. remove the pins, undo the cooling water hose (buy a new fitting, that fitting is probably what was the cause of the overheat), disconnect the bellows and pull the drive.

behind the drive is the 6 bolts on the clamp ring. unbend the lock tabs, remove all 6 bolts, then there are 3 threaded holes. put 3 bolts in the threaded holes and jack off the clamp ring

then disconnect throttle cable, exhaust, fuel, electrical and pull motor/PDS as a unit

 

[Waffu Chief]

Primary Drive Shaft. the "bell housing" on the AQ series drives is known as the PDS housing.

to remove the drive, pull the shift cover off the drive, disconnect the shift cable, disconnect the helmet use 1/4-20 screws (or 1/4-28 dont remember) to drive the helmet pin out. remove the pins, undo the cooling water hose (buy a new fitting, that fitting is probably what was the cause of the overheat), disconnect the bellows and pull the drive.

behind the drive is the 6 bolts on the clamp ring. unbend the lock tabs, remove all 6 bolts, then there are 3 threaded holes. put 3 bolts in the threaded holes and jack off the clamp ring

then disconnect throttle cable, exhaust, fuel, electrical and pull motor/PDS as a unit

Thanks for that Scott, that's the way to do it.

 

[kenny nunez]

After the engine is removed and if it turns out that the PDS shaft is rusted into the flex plate then the only way it can be removed is by using a 1” hole saw and cutting a hole in the outer perimeter of the flywheel housing to gain access to the bolts that mount the plate to the flywheel.
If the engine is beyond repair the good news is that the drive has the 1.61 ratio and you can replace the engine with a V8 or V6 power. That will be cheaper than rebuilding the original 170.

 

[Scott Danforth]

After the engine is removed and if it turns out that the PDS shaft is rusted into the flex plate then the only way it can be removed is by using a 1” hole saw and cutting a hole in the outer perimeter of the flywheel housing to gain access to the bolts that mount the plate to the flywheel.
If the engine is beyond repair the good news is that the drive has the 1.61 ratio and you can replace the engine with a V8 or V6 power. That will be cheaper than rebuilding the original 170.

or weld a plate on the end of the PDS shaft, and use the porta-power to pull it off the motor........ you would need a new PDS shaft and flex plate at that point