Engine Zincs

My Yanmars have at least 3 engine zincs that would be eaten away every 6 months. They are not cheap to replace and there are so many with different threads,---- and if you can unscrew the zinc from the 22mm plug.

For 3 years now I have always flushed with fresh water after use, I think I have given this enough time now to post that 90% of zinc erosion has stopped with fresh flushing.

I know people flush outboards but I dont know of anyone fresh flushing sea going engines after use.

 

I always used to fresh water flush my old small outboard on my fishing boat after every trip.

 

Be very careful about leaving fresh water in an engine IF there is any part like the exhaust that is stainless in the raw water circuit.
The zinc will become the noble part and the stainless the anode.
In freshwater use the zincs are replaced with ( I think) magnesiums ones but for sure not zinc.

 

Yanmar 240 HP

I just bought a brand new boat with Yanmar 240 HP in it

My boat has a garden hose fitting to do fresh water flushes after using in salt

The Model # on the Engine is RCD6LY2x1

Cant find a Service manual anywhere. would you know about them?

where are the zincs?

Pictures?

also Having trouble finding Fuel Filters Yanmar/Racor Part # 4412-012

Any of you folks have a good source?



Capt Walt

WickedGoodOutdoors@maine.rr.com

 

There shouldn't be any need for zincs in the engine itself if the engine is cooled through a heat exchanger and it should be unless very small. There might well be zincs in the sea water parts.

You dealer or builder should supply this info.

 

The engine designation is 6LY2, what the rest means is unclear to me.
There are not less than 5 Zinc anodes to control corrosion in various cooler parts.

This is a page with some details:
http://www.yanmar.com.au/qrg/6ly2-ste.pdf

I hope that helps.

rgds
CDK

 

Close.

The engine in my boat is an Inline 4 cylinder

RCD6LY2x1


It also have a second metal tag that has 4LHA-STP

 

These Yanmar numbers are sometimes confusing, but if the factory has put that tag on it they were sure it was a 6 cylinder.
To get certainty, make a picture and compare that with those on http://www.yanmar.com.au/marine.htm or their US counterpart.

The LY2 series are not listed on the Yanmar site anymore, but they have the new BY2 series instead, where the B stands for BMW!

 

It also have a second metal tag that has 4LHA-STP

 

Yes that is the right one!
240 hp @ 3300 rpm for stern drive use.

Yanmar says this is 4LHA-STZP; you won't have any problems finding the info now.
Good luck!

 

Are Yanmars SAE or Metric?

Are Yanmars SAE or Metric?

Putting together a tool kit for the boat.


I also have lots of extra tools for sale. ended up with a couple sets from my Grandfather, a couple sets from my Father and I already have a few sets myself so Im thinning the heard.

tools for sale.

Open End Wrenches: Various sets

Socket Sets 1/4", 3/8", 1/2" in a tool box $100 for all

Spin Socket Driver Sets $20 per set

Tin Snip Sets $20 per set of 3

a couple table saws $100 each

a 12" Delta Planer & Metal Cabinet Stand $200

Stanley Hand Planes $200 Each

Lots of other stuff.

**********************

 

I guess they're metric, at least since they cut a deal with BMW.

No kidding, the Japanese have always been metric unless they made special products for the US market, but do things a bit differently. An M8 bolt has a 13 mm head in Europe, 12 mm in Japan (better steel!). You probably need Torxx as well, that is becoming popular very rapidly.

 

I don't buy that on the basis you are saying. Zinc is -1050 in the galvanic series, stainless -150 when it is passive (oxygenated) and still only -550 when active (oxygen starved) way more noble than zinc in either case. What is possible is if the zinc sits in freshwater it may form corrosion and insulate itself so it no longer functions properly but I doubt that would be the case with clean tap water.