Problems with new engine! aaahhhh, views sought

[ccscott49]

Halyard make a system with UJ's, but it also incorporates a thrust bearing, which is bonded,screwed/bolted to a plate/minor bulkhead/floor in the boat, to take the prop thrust, my boat has this sytem.
Allows soft engine mounts to be used, plus level engines and less noise vibration. Good system, the shaft still has to be aligned with the thrust bearing.

 

[ccscott49]

Aquadrive, does have a thrust bearing, well mine does anyway, but yours of course may be different, or they may have found a way to do away with the thrust bearing part, mine is very old!! (42 yrs)
May not even be a aquadrive, probably ex naval (new) system, knowing my boat!
I know the props, shafts, P brackets, stuffing boxes etc are! Still got the war office little arrows on them!

 

[john_morris_uk]

[ QUOTE ]
A couple of details...

1. The Aquadrive does not have, as far as I know, a thrust bearing. It is simply a pair of CV joints. I have one and it works brilliantly.

[/ QUOTE ]
Not sure which Aquadrive you have as our Aquadrive (and all the others that I have seen) DOES have a thrust bearing. The prop shaft comes from the stern gland to a dwarf bulkhead which has a thrust bearing mounted on it. The two CV joints and short shaft are between the thrust bearing and the engine. Ours works brilliantly, and the engine is amazingly smooth and quiet.

 

[srp]

Pictures of a Halyard Aquadrive
here and here
It has a thrust bearing housed in the large casting, and a pair of cv joints plus short shaft inside the rubber bellows.
The other coupling referred to above is probably an R and D coupling

 

[kds]

I found Beta very helpful indeed - have you spoken to them ? Was it professionally installed - or just by a friend ?
Ken

 

[bluemoongaffer]

Boatmike wrote: "If your engine was fitted out of the water it will almost certainly need re-aligning now the boat is afloat. Either way it is clearly not right. Get the guy who installed it to put it right!"

I installed my engine out of the water and lined up correctly before tightening the engine mounts. Why should it change now it's in the water?
Regards Paul

 

[Robin2]

I fitted aquadrives to my 2 yanmar 1gm10s and would never have a boat without them again (or a saildrive which achieves the same result). They reduced noise and vibration and, as far as I can see, also reduced the amount of movement of the engines on their mounts - presumably because the engines are no longer being "excited" by he propshaft.

The aquadrives have a thrust bearing which is fitted to the hull and lined up with the propellor shaft. This is connected to the engine with two Constant Velocity Joints so their is no thrust passed through to the engine and the engine vibrations are not passed to the propshaft.

Prior to the aquadrives I had one of those 10mm thick (approx) white plastic disks between the engine and the propellor shaft - but that is not at all flexible when compared with an aquadrive coupling.

 

[duncanmack]

Quote

I installed my engine out of the water and lined up correctly before tightening the engine mounts. Why should it change now it's in the water?


A boat hull is designed to have the weight supported by water - the keel being "hung" off the bottom.

On land, the weight is resting on the keel and any other props/supports used.

The stresses on the hull are completely different and the shape of the hull will be different. On some designs/builds of hull the difference will be marginal and on others the difference will be quite noticeable.
So, the engine alignment will be different, but depending on the design/build of the hull the misalignment will vary between "not worth sorting" to "bl**dy hell, I don't believe it!"

An analogy - try jacking your car up on a sill jacking point. See if the doors will still open and shut. Some won't.

 

[tangofour]

[ QUOTE ]
An analogy - try jacking your car up on a sill jacking point. See if the doors will still open and shut. Some won't.

[/ QUOTE ]

If this is the case with your car may I respectfully suggest that you scrap it tomorrow!

 

[ccscott49]

On the old austin allegro, this happened, even on new ones, you couldnt suspend tow them either, had to use a car "ambulance", because by the time you got them to the garage, the doors would never open, ever!!! Like they were welded shut. Believe me I know!
There are a few cars like this or rather were.

 

[duncanmack]

[ QUOTE ]
[ QUOTE ]
An analogy - try jacking your car up on a sill jacking point. See if the doors will still open and shut. Some won't.

[/ QUOTE ]

If this is the case with your car may I respectfully suggest that you scrap it tomorrow!

[/ QUOTE ]

Clarification.
Try opening and shutting the doors with the car on the jack

When you take it off the jack all should return to normal

/forums/images/graemlins/grin.gif

 

[ccscott49]

Dont open the doors with the car on the jack! It may fall off the jack, if you mess with it!

 

[duncanmack]

[ QUOTE ]
Dont open the doors with the car on the jack! It may fall off the jack, if you mess with it!

[/ QUOTE ]

But how is Aunty Jeannie and the three weans goanny get to the chippy and the sweety shoap and the lavvy? They canny wait furra car tae cum oaff ra jack. When they goat tae go they huv tae go nooo! Snow joak but! /forums/images/graemlins/grin.gif

 

[ccscott49]

The idea, is ta unload fus!

 

[pappaecho]

Having had a Beta replacement recently I found the engineer(s) and the service impeccable.
If you paid for an engineer to fit the engine, then get him back to do it properly!