Yanmar 3JH Engine Anode

[BrokerBen]

Where abouts does the pencil anode go on this 47hp 3 Pot Turbo diesel unit, with fresh water cooling.

Thanks for any input, and thanks extra for any useful pictures! The manual has not been very helpful in finding this information out!

Ben

 

[Nick_Pam]

As far as I understand it, if the engine is fresh-water cooled, there are no engine anodes...they are only fitted to raw-water cooled engines.....

But I will stand corrected!!!

 

[BrokerBen]

This was my thought, but when I ordered the servicing parts they gave me this anode which has been knocking around my car for weeks now... I changed the ring anode on the saildrive when out of the water, but still haven't found if this one is used.

Thanks for your input.

 

[rushers]

Have you found an easy way of changing the impeller?

 

[Nick_Pam]

Mine's a 4JH-4E and it's Right on the front !!!

Probably doesn't help you a lot..... /forums/images/graemlins/blush.gif

 

[Oldhand]

3JH-TE doesn't have an anode.

 

[jeremyshaw]

Not by any chance a saildrive? There's a pencil anode that goes in the top of the saildrive (27210 - 200550). There is no anode for the engine on the 3JH3E (well, not found one in 4 years, and not that I've ever found in the service/parts manuals!).

 

[BrokerBen]

Right, I'll start searching the Saildrive /forums/images/graemlins/wink.gif I did the ring anode recently and the saildrive itself wasn't showing any signs of corrosion. Hopefully I'll do the pencil anode tonight and all will be well. Thank you very much.

Any suggestions as to where on the saildrive it goes? Pictures maybe?

 

[jeremyshaw]

I did try a pic on the forum the other day but made a muck of it.

Anyway the pencil anode location is quite easy to find. These instructions apply to my SD31 but the parts manual has the same drawing for SD20 and 30.

Basically look for a large hex cap on the opposite side of the saildrive to the Kingston cock - i.e. a couple of inches above the gaiter.

When replacing the anode you ought ideally to replace the O ring as well.

One small point though, is do bear in mind you are below the waterline here! So if you are in the water you might want to wait until you are hauled. I didn't even know I had an anode there for a couple of years and then panicked when I discovered it. but actually found very little erosion (though a friend had to replace both saildrives on his boat at point of purchase because the owner had never changed the anodes). My pencil anode had done two years and was half eroded before being changed - but of course it all depends on the circs.

You can actually change them underwater too - I wrap duck tape round the intake baffles and bung cloth up the bottom hole of the saildrive which reduces water to a trickle. Assumes you have tanks or excellent lungs, and easier in the warm waters of the Caribbean too!

I am not sure, but I don't think closing the Kingston cock will allow safe withdrawal of the pencil anode. I might well be wrong so an option would be to test that (carefully). However you may find, like most people, that your Kingston cock is frozen or will not shut the flow even when apparently closed. I make a habit of operating mine regularly but still have trouble and in fact need to replace one now.

BTW well worth forking out for the service and parts manuals in my view. Not cheap - about £100 for the set of 4 (engine/saildrive) , but I find them very useful. Got them from French Marine. In fact I use the parts manuals most of all as they have very good exploded diagrams whereas the service manuals (unless updated in last 2 yrs) have rather poor black and white photos - so you could just get the parts manuals.

If you are struggling pm me and I'll email you a drawing - probably a breach of copyright to post on the forum anyway.

 

[BrokerBen]

I am sure I will be ok now thanks /forums/images/graemlins/smile.gif

I am not afraid of underwater changing of things, transducers etc no worries. It'll take a long time with a hole of that size for anything untoward to happen /forums/images/graemlins/smile.gif

Thank you very much for all your help.

Ben