AQAD31A

[Machaseo]

Hi All,
This is probably one for the Volvo specialists I guess.
One of the biats in the club has a problem with his AQAD31A, he has emulsified oil, no over heating, no loss of fluid from the header tank, but.......... A flywheel housing full of salt water when he took the starter motor out.

I am not that familiar with the sterndrive set up, but to my knowledge the engine bay hasnt been flooded at any point.

I will give him a hand at the weekend to lift the engine out, Any obvious things i should be looking at?
I had a look at the drawings on the volvo website, is the flywheel housing sealed to the transom plate?
Is it likely that item 80 has failed and let seawater into the flywheel housing housing and water has been forced into the sump via the crankshaft oil seal when the engine has been running?
Thanks Barry

 

[spannerman]

You have a choice depending on access, either removed the drive then the lockring on the outside of the transom so the engine can go forward 12" before lifting, or undo all the bolts around the flywheel housing, one is a bit tricky down by the exhaust, then you just move the engine forward a couple of inches and lift straight up.
More than likely from what you say it has let water in through the rear main seal, probably the crank has rusted ripping the seal.
However you have to find out where the seawater came from, it could be the bellows have leaked allowing seawater to travel through the intermediate shaft housing and into the flywheel housing, in which case you will need seals and bearings for the intermediate shaft. Also check that seawater hasn't got past the top drive shaft seal into the drive behind the U/J.

 

[scottie]

You may find that the seal on the primary shaft has gone so perhaps start by removing the outdrive and checking the the bellows which should be replaced every two years the oil in the drive should be checked for water and changed check output/propeller shaft seals as water can get in that way rusted bearings can cause extreme damage
Outdrives are expensive to ignore
There are several other places that water can get into the oil but the flywheel housing seal seams most likely this may be doable in the boat
Suggest to you contact Volvopaul of this forum by PM
Has the boat been used recently?
Getting the salt water out is an urgent matter to avoid rusting if the bearing on the primary shaft seizes at speed you will be talking four figures

 

[Machaseo]

Thanks for your responses guys, i will know more tomorrow but it looks like the smart thing to do is remove the leg and lift the engine with the bellhousing attached, most likely the crankshaft oils seal and output shaft seals will need repalced and hopefully the shafts arent damaged.
I hope he isnt in for a too big a bill.