Yamaha Hydradrive

[mooks100]

Hi I have just bought a boat with a yamaha hydradrive and me420sti engine.

The problem is it will not engage into astern will go forward ok.

Any help would be great it is the first diesel and first outdrive I have owned
all help would be greatly appreciated!

[Declanor]

Sounds like clutch plates. The Redbay boys are well versed in these, contact them id say. Willk?

[willk]

Originally Posted by Declanor

Sounds like clutch plates. The Redbay boys are well versed in these, contact them id say. Willk?

Oh for sure they'd FIX it. Not so sure about remote assistance, although they'd be more sympathetic if it's a Redbay, natch. I do know they pop over to Scotland on the big wan to do service work now and then. Andy Gee on here is the man to talk to. He owes me one for slandering me when he implied that I broke that Yanmar leg, as everyone knows that donegaldan was responsible...

[biffer]

Don't think it would go forward if it was clutch plates. I'm thinking it may be the little hydraulic valve that basically is a gear selector. I've had this where the piston inside gets jammed

sent from a remote device

[Roger Marr]

The leg has two sets of clutch plates one for forward and a separate for astern

[biffer]

Have you heard of a hydra drive leg ever eating a set of plates let alone a reverse set that doesn't get a load of gbh

sent from a remote device

[Roger Marr]

Originally Posted by biffer

Have you heard of a hydra drive leg ever eating a set of plates let alone a reverse set that doesn't get a load of gbh

sent from a remote device

Yes brother bought a spare leg with the same problem stated here

[biffer]

how unlucky, all the time i've been messing with yam's that's the first one i've heard of, maybe two now, i'll still bet on the valve at this moment, perhaps Mooks could give us some more info, is the lever stiff when selecting reverse, does it slip, lose drive or bang in fwd gear, oil colour, level, have you tried disconnecting the shift on the side of the engine and getting a screw driver though the hole on the cable that comes up from under the exhaust pushing or pulling it manually, this is with the engine running, cable still disconnected and engine stopped try engaging gear then restart engine to see what happens, let us know if you're up to this and how you get on, what i'm hoping is an easy fix, what the other guy is suggesting is a lot more money

[mooks100]

Sorry for the late reply I have been away at work with no access to the internet.
Before i left i had the boat in the water and i changed the gear oil. ther boat will go astern now but it takes its time to engage unlike going ahead. she goes ahead no problem no bangs or anything nice and smooth but put her astern and nothing for a while build up the revs and eventualy she will engage and she seems to have plenty of power once engaged.
But as you can imagine it would be nice to have astern as soon as you need it!
I hope this will help to give me any advice like i said the outdrive is new to me.
So again thanks in advance.

[Andy Gee]

Disconnect the gear cable at the engine manifold and try it by hand-you should feel it catch the "stop" bumps ie ahead neutral and astern. Put a wee mark with a felt tip on the cable where there points are.
Reconnect the cable and make sure that when using the helm control all three points match.

If they do then either the filter in the leg is blocked-if it is then what with?
The shuttle valve is passing the o rings/pump if knackered or the astern clutch pack it knackered....although unlikely if ok when finally engaged.

Did you use the correct oil when changing?

HTH
Andy

[mooks100]

Cheers Andy I will try that when I get back home next week and yeah I got the proper Yamaha gear oil to put in the leg.
Last time I was at the boat I had the engine running and shut the hatch and the engine stopped I think it is a loose wire so when I get home I will try and get that sorted then i will try the gear cable.