mariner 60 engine problem

poloeyes · 07 April 2013, 15:11

i have a mariner 60 2 stroke, when last using it at almost full throttle the engine suddenly revved up to full speed but the boat lost drive, put it into neutral and was ok again for around an hour. the problem reoccurred later, and since then if i try to go forward anything faster than tickover it does the same thing, like its going into neutral. reverse is fine, only forward. when in gear i can turn the prop by hand and hear a clicking sound. any advice would be greatly appreciated

matt h · 07 April 2013, 15:31

could be Gear linkage adjusted wrongly.....sounds like it might have only just been in forward gear... . does the gear slider go equally forward and reverse, this is under the hood...also possibly like the rubber has given up in the centre of the prop possibly..first thing first, can you hand turn the prop either way when out of the water? ok take the prop off and check it out, if its that bad you will see tell tale signs of it.

PeterM · 07 April 2013, 15:48

I think some of the Merc/mariner engines had a free wheel set up so the prop can still spin one way bit not the other if still in gear. Give it a spin to see if this the case...one problem solved maybe.

But the actual problem sounds like a prop bush to me...

Of course if the prop spins both ways by hand it's the gearbox somehow..

yam man · 07 April 2013, 16:46

Prop bush

poloeyes · 07 April 2013, 17:37

thanks for the replies.
unfortunately its not the prop bush, that was my first thought (and hope).
gear linkage? dont know anything about that, some pointers would be helpful.
i did have the engine serviced prior to the last time i used it, if that could make a difference

matt h · 07 April 2013, 17:52

gear linkage adjustment? ok, tilt the engine up and take cover off, if poss put in full forward gear and full reverse whilst watching the gear slider... you will see it .... take a note of the gear selecter slider bar, when forward gear full it should slide full movement forward (or back cant remember) and when reverse should move in opposite direction, neutral will be in the middle.if different to my description adjust with the cable adjustment accordingly.
Im thinking the cable is so worn that its not reaching full forward and slippin out of gear.

peterwhite · 07 April 2013, 18:30

How can you tell it's not the prop bush? If there was a problem in the gearbox then you'd be getting serious problems if it was jumping in and out of gear at full rpm in fact I'd be surprised if the box didn't explode. I'd double check the prop bush and if In doubt try another prop to be sure as what you are describing is exactly that of a failed prop bush.

Turbodiesel · 07 April 2013, 19:38

Dont think it sounds like gear linkage, it would be jumping in and out of gear if the linkage was out and you would really know about that!. Does sound like the prop hub to me, push the busing out if its a flow torq hub and check it for cracks etc.

Nos4r2 · 07 April 2013, 21:21

Unlikely to be a flowtorq hub on a 60hp 2 stroke?

Mark the prop and the prop nut in line and see if the two line up after trying to use it?

9D280 · 08 April 2013, 10:17

....or take the prop off & have a very close look at the rubber - metal joint. There will be traces of "extruded" rubber oozing out of the joint if it's gone.

Reason it's OK after a while at rest is the rubber starts to melt as the hub & the body spin at different speeds. When you stop, it's surrounded by seawater, so the rubber re-solidifies.

I would have thought if it was slipping out of gear you would hear a LOT of clattering - think missing the clutch in your car - that ain't quiet!

Can you borrow a prop off someone or put your prop on another engine?

Turbodiesel · 08 April 2013, 17:50

Quote:

Originally Posted by Nos4r2

Unlikely to be a flowtorq hub on a 60hp 2 stroke?

Mark the prop and the prop nut in line and see if the two line up after trying to use it?

Yes very true!, im thinking of the bigfoot model!!

poloeyes · 20 April 2013, 14:27

Quote:

Originally Posted by peterwhite

How can you tell it's not the prop bush? If there was a problem in the gearbox then you'd be getting serious problems if it was jumping in and out of gear at full rpm in fact I'd be surprised if the box didn't explode. I'd double check the prop bush and if In doubt try another prop to be sure as what you are describing is exactly that of a failed prop bush.

turning the prop by hand while looking at it, and trying 2 other props

poloeyes · 20 April 2013, 14:33

Quote:

Originally Posted by matt h

could be Gear linkage adjusted wrongly.....sounds like it might have only just been in forward gear... . does the gear slider go equally forward and reverse, this is under the hood...also possibly like the rubber has given up in the centre of the prop possibly..first thing first, can you hand turn the prop either way when out of the water? ok take the prop off and check it out, if its that bad you will see tell tale signs of it.

thanks for the advice, havent had an opportunity to have a look at it yet, but will be what i try first, and hope that is the problem!