engine only rotates in one direction ???

[8ob]

So the props definitely need to rotate in opposite directions.

The Wikipedia entry for sterndrives mentions "lower units are also available with counter-rotating gearing to provide balanced torque in dual-drive installations."

That would suggest the engines are likely to rotate in the same direction, but the gearing arrangement results in opposite directions of rotation of the props themselves. Are there any model labels or ratings plates on the outdrives themselves?

Clockwise/counterclock in paired up marine engines are common, its not all about the props either. That said wollys engines may just be marinised car engines. https://www.melling.com/wp-content/uploads/2017/03/marine-engines-standard.pdf

Bob

 

[W.olly]

Morning chaps

Now we are all getting lost in outdrive rotation when its not that but one of the engines

Engines when cranked by hand can move in both direction yes ?

So one engine does move in both directions , that is when turned by hand ( both directions ) and the starter motor spins it over with ease , in which ever direction it does.

The other engine only turns by hand anti clockwise, on the starter motor it jams solid. Engine will not turn clockwise at all by hand.

My conclusion is the drive must be seized and the drive is in gear, i will check again, already have though if its in neutral but there could be something wrong with selector.

Ill let you know later today i hope.

 

[waddycall]

If it is in gear why would it rotate one way and not the other?

 

[bert]

I've seen lots of boats with car derived engines fitted. Starters turn them the wrong way and I think you only need a different cam to make it work.

If have though in this case the engine should turn by hand both ways, at least my dad's boat did but that has twin ford saver 90's

 

[jerrytug]

I've seen lots of boats with car derived engines fitted. Starters turn them the wrong way and I think you only need a different cam to make it work.

If have though in this case the engine should turn by hand both ways, at least my dad's boat did but that has twin ford saver 90's

The cam chain arrangements would need altering as well. Also the oil pump drive. Pistons are designed with a thrust side I believe. There's a few things depending on the engine, it's an interesting subject.

 

[Munkul]

Morning chaps

Now we are all getting lost in outdrive rotation when its not that but one of the engines

Engines when cranked by hand can move in both direction yes ?

So one engine does move in both directions , that is when turned by hand ( both directions ) and the starter motor spins it over with ease , in which ever direction it does.

The other engine only turns by hand anti clockwise, on the starter motor it jams solid. Engine will not turn clockwise at all by hand.

My conclusion is the drive must be seized and the drive is in gear, i will check again, already have though if its in neutral but there could be something wrong with selector.

Ill let you know later today i hope.

You said you've changed the starter motors... sure one of them isn't supposed to rotate the other way? So it's in effect trying to turn the engine the wrong way?

When they modify the engine for counter rotation, the cam chain tensioners/guides etc will presumably have to be modified to take tension in reverse... with a possibility that it binds in the other direction... alternately your guides are damaged/broken and bind up the chain when turned the wrong way.

 

[W.olly]

You said you've changed the starter motors... sure one of them isn't supposed to rotate the other way? So it's in effect trying to turn the engine the wrong way?

When they modify the engine for counter rotation, the cam chain tensioners/guides etc will presumably have to be modified to take tension in reverse... with a possibility that it binds in the other direction... alternately your guides are damaged/broken and bind up the chain when turned the wrong way.

The engine only turns in one direction though. The other engine is fine aawell. So if one engine has wrong starter then neither will turn by starter motor.

 

[W.olly]

You said you've changed the starter motors... sure one of them isn't supposed to rotate the other way? So it's in effect trying to turn the engine the wrong way?

When they modify the engine for counter rotation, the cam chain tensioners/guides etc will presumably have to be modified to take tension in reverse... with a possibility that it binds in the other direction... alternately your guides are damaged/broken and bind up the chain when turned the wrong way.

They are the same starter motors just removed to get them working.

 

[Munkul]

Ah ok, i see

So anyway, if it's not the drive mechanism itself, then you're going to have to pull the timing covers and check that the timing hasn't skipped or the guides/tensioner hasn't been damaged.

 

[bricol]

Morning chaps

Now we are all getting lost in outdrive rotation when its not that but one of the engines

Engines when cranked by hand can move in both direction yes ?

So one engine does move in both directions , that is when turned by hand ( both directions ) and the starter motor spins it over with ease , in which ever direction it does.

The other engine only turns by hand anti clockwise, on the starter motor it jams solid. Engine will not turn clockwise at all by hand.

My conclusion is the drive must be seized and the drive is in gear, i will check again, already have though if its in neutral but there could be something wrong with selector.

Ill let you know later today i hope.

Does it turn with the starter removed?

I've had engines locked up when the starter motor is ********, fitted incorrectly, or a spacer.

The crossflow in a trials car that would rotate backwards but wouldn't the correct way, was due to the top half of a con rod wedging in the hole it had created through the side of the block when the cap came off . . .

 

[W.olly]

Does it turn with the starter removed?

I've had engines locked up when the starter motor is ********, fitted incorrectly, or a spacer.

The crossflow in a trials car that would rotate backwards but wouldn't the correct way, was due to the top half of a con rod wedging in the hole it had created through the side of the block when the cap came off . . .

Nope, doesn't turn clockwise only anti clockwise with starter removed. Starter is fine as its in the other engine now and working fine.

 

[arther dailey]

engines kida

View attachment 277078

nice to see a 1970s style wiring loom !

 

[W.olly]

nice to see a 1970s style wiring loom !

So much better hey than modern crap. Easy peasey

 

[bricol]

Nope, doesn't turn clockwise only anti clockwise with starter removed. Starter is fine as its in the other engine now and working fine.

Very least the rocker cover needs to come off- might be a stuck valve that you've been battering with a piston all weekend . . .

 

[Seadog]

might be a stuck valve

And how would that allow the engine to turn on one direction and not t'other?

 

[Nomad]

Is there an easy way to disconnect the motor from the output so you check if the problem is internal to the engine or outside (gearbox?)

Many years ago I managed to lock up a Ford gearbox by selecting 2nd & 4th gear at the same time - apparently impossible to do as only 1 of the 3 internal gearbox selector rods can move at a time - a mix of worn internals and loose fixing bolts allowed the impossible to happen.

I know car mechanicals but very little about boats, good luck with the project, looks like fun

 

[bricol]

And how would that allow the engine to turn on one direction and not t'other?

If its closer to the valve in one direction than the other . . . piston has to go all the way down and back up to smack it in the other direction . . . only mentions turning it a little way in either direction

 

[arther dailey]

So much better hey than modern crap. Easy peasey

ye tracing a loom fault there is right in front of your eyes eh

 

[Barking Mat]

The impeller in the raw water pump wont like turning the wrong way, it may well bind.

Bob

Good point!

hugely unlikely.

 

[Barking Mat]

Does the afflicted engine propellor turn? My bets on the gearbox is in forward or backwards, and is the stern drive ceased?

Id follow the Morse cable, remove from gearbox, and you should be able to find fwd/neutral/backwards.
and try neutral.

failing that in the bell housing you could have a flexible couplings which has exploded, and is blocking in one direction. Unlikely to be the engine.