Deglazing clutch cones

J

jrussill

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Hi all,
I’m sure I read somewhere that you can attempt to deglaze Kanzaki clutch cones ‘in situ’ by draining the oil and replacing with acetone (or something). Is there any truth in this?
This relates to the gearbox on a Yanmar 1GM10 that isn’t taking up the drive properly when put into gear.
Thanks, Jon
 
What you need is snake oil! I tried paraffin, power-steering fluid, and ATF with no change. Acetone and nitrile rubber, if that is what the seals are, is definitely not a good idea.
Stripping the box and lapping the cones is not a difficult job made much easier with an air wrench.
 
Thanks. Maybe it’s worth stripping the box after all.

Anyone know a source of new cones, if the current ones are too far gone? They seem to be enormously expensive.
 
Before you do that make sure that you speak to the manufacturer. A friend of mine was at the point of buying a new saildrive die to gear hange and clutch problems. He messed about with all the shims etc using parts from a spare box. In frustration he rang the manufacturer and they told him to use a different oil. It was a job to obtain as it was an odd grade but it immediately solved the issues once he put the bits all back together as they were originally set
 
I did an oil change last year, with the right oil - SAE30. Previous owner had been using 15W-40. At the time I imagined that it did make a difference. Perhaps another change might be worthwhile to flush out the last of the 15W-40.
 
I remember a friend telling me he'd changed his gearbox oil and lost all drive. We both used the same engine (Yanmar 4JH4AE) with a Kanzaki gearbox. It was a while ago and I can't remember exactly but think he'd used either EP or ATF oil. I had already checked and knew that he should have used normal engine oil.
 
Mistroma said:
I remember a friend telling me he'd changed his gearbox oil and lost all drive. We both used the same engine (Yanmar 4JH4AE) with a Kanzaki gearbox. It was a while ago and I can't remember exactly but think he'd used either EP or ATF oil. I had already checked and knew that he should have used normal engine oil.
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Thanks. Did he replace it with the right oil and then get drive back?
 
jrussill said:
Thanks. Did he replace it with the right oil and then get drive back?
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Not 100% certain but my memory is that he had someone strip it to clean and checked or cleaned the cones at the same time. That makes sense but I'd need to ask if he remembers the details from around 2013. He's off on a round the world trip just now but I can try to contact him.
 
Heckler said:
The net has plenty of stories about this gearbox and deglazing the cones. Google is your friend
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Indeed! However there’s not a great deal about things that could be attempted without removing and stripping down the gearbox. That’s what I’m really after. Realise it’s not the proper way to do things, but rather short on time.
 
jrussill said:
Indeed! However there’s not a great deal about things that could be attempted without removing and stripping down the gearbox. That’s what I’m really after. Realise it’s not the proper way to do things, but rather short on time.
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If you can slide the prop shaft aft by a couple of inches removal of the gearbox from the boat is easy. With the box on the bench (dining table will do but may cause domestic strife) and an air wrench or similar the cone lapping is a half hour job. Oil seals from eBay and a tube of instant gasket and you're home free.
 
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