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Old 29-08-2014, 06:00   #1
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pirate Shifting Tentatively

Read here recently that Yanmar trannys should be shifted with gusto, rather than easing into gear and perhaps causing premature wear on the cones.

Any thoughts or consensus on this?
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Old 29-08-2014, 18:23   #2
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pirate Re: Shifting Tentatively

Bumping.
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Old 29-08-2014, 18:34   #3
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Re: Shifting Tentatively

That is the only way ours shifts, but we are considering replacing it this year.
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Old 29-08-2014, 18:53   #4
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Re: Shifting Tentatively

Dunno, have always shifted smartly with engine at idle.

Didn't know any other way to do it

Push the lever firmly like you mean it, it goes clunk; push further, the RPM comes up and the rest of the stuff happens.

Always worked in the past, expect it to work in the future - touch wood; luckily for me, it's a wooden boat
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Old 29-08-2014, 18:56   #5
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Re: Shifting Tentatively

This is about allowing or not allowing pressure plates/cones to slip. Slipping is bad for all clutches.

I wouldn't "crash" shift any transmission, nor would I take 5 seconds to get into gear.

Engine at idle and shift positively and smartly...

Avoid shifting directly from forward to reverse except in emergencies. Avoid emergencies - LOL

Gear grinding, clunking or squealing should be cause for investigation.
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Old 29-08-2014, 20:22   #6
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Re: Shifting Tentatively

I think a cone clutch is pretty much a metal to metal deal. The sooner you get it hooked up the better. Anything less is wear and tear on the cone. Multiple disks clutches are made to wear and can handle slipping longer. Think of a fork lift, it has so many disks you can't count them. They are always slipping.
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Old 30-08-2014, 02:32   #7
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Re: Shifting Tentatively

Think about what a clutch is designed to do – if the system was tough enough you'd just smack the gears together and off you'd go, who needs a clutch. But if every time tarzan put boat into gear, boat comes out of water for new gearbox, maybe a clutch would help. In which case why would you use the clutch as if you didn't need it, and just smack it into gear?
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Old 30-08-2014, 09:53   #8
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Shifting Tentatively

In a tranny with a cone clutch, the gears are always meshed. So there's no comparison to shifting a car transmission. It's metal (the cone) on metal (the gear) so any shifting hesitation polishes the surfaces. Shift it quick or prepare to pull it out one day.


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Old 30-08-2014, 10:31   #9
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Re: Shifting Tentatively

Crabby...

If I were from the other side of the pond... I would use the term...

Smartly... Or is it smartley... smart-a-lee... Oh hell...

Don't bugger around with it!
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Old 31-08-2014, 16:28   #10
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Re: Shifting Tentatively

Yeah – if its a cone clutch – my yanmar has 2 flat plate clutches, 1 for reverse, 1 for forward, so it is in fact "just like a car clutch" – how do i know? Cos i had to pull it apart and replace them, probably because someone had been engaging them 'smartly' enough to burn the forward clutch out...
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