Yanmar Mixing Elbows

[Guest]

Just done the water pump (thanks WHEELS!) and I believe the mixing elbows are the next to go??

Mine's a Yanmar 2GM20-YEU. Anyone around who makes them out of stainless? A search of the

net turned up the usual UK/US sources but nothing here?

[wheels 543]

Has it rotted out??

I have not heard of a SST version, but think of how long the Ally one has lasted and really, is it worth the expense of replacing with SST? The main failure with them is builld up of Salt crud. A good clean and that usually sorts them out. But corrosion will get them in the end.

I have always thought that these things would last longer if they anodized them.

[Grinna 2]

What about a ceramic type coating inside and out for the mixing elbow .... like the coatings they put on race car exhausts. Surely something like that would cope with the heat and protect the parent metal from corrosion.

[Guest]

I have heard (HORROR!!) stories of them failing. The consensus seems to be that the lifespan is 10 years and Yanmar admits they know of the fault. Apparently they can even crack in the weld at the manifold flange. Rust holes or cracks allow water to run into the cylinder head and then it gets really expensive!

If I have to settle for a alloy one, will fire into it some of that exhaust paint (handles 800deg). Trouble now is finding one! I haven't taken mine off yet but after 12 years I am sure its going to be ready for the bin. Any ideas of where the best place to get a new mixer would be??

[Grinna 2]

How deep is your wallet??

 

Whiting Power Systems are the Yanmar agents but you can expect to pay large amounts for parts from them. Simms Diesel and Turbo in Penrose can also get Yanmar parts .... they might be worth a try.

[Guest]

How deep is your wallet??

 

Theres an echo and moths fly out of it when its opened.... it snaps shut too like Arkright's till!

 

I will Simms Diesel a tinkle. Thanks!

[Guest]

salt water combined with exhaust gasses produces sulphuric acid, surprisingly black steel outlasts a lot of alloys and definetly stainless, however, a grade of stainless known as 2RK65 is pretty impervious to corrosion as an exhaust elbow/ mixer, doesn't come in tube form only flat sheet so fabrication'll cost you however it will last a lifetime

[wheels 543]

L4, it's not the salt water but the Sulphur that used to be in the Diesel that created the Sulphuric Acid. We now have no Sulphur in the Fuel and so that issue is mostly gone. What is created however, are some Chlorides and of course the Saltwater itself is not so great on Ally. In saying that, 10yrs for any exhaust component is not bad. Depending on how many hrs you have clocked up in that time of course.

[Guest]

640 hours Wheels.

[wheels 543]

So you would like something like this

[Guest]

ooohhhHHH! thats... BIG!!. (and polished too!!)

Actually, I would settle for something I don't have to sell a kidney to get that simply does the job! (Whiting said they would ring me back today with a price. That was 6 hours ago. Probably still running the markup through their cray computer or waiting to see if I win lotto)

[wheels 543]

Yeah, I like shiny.

Let me know what they are going to sting you for a new elbow before you go buying.

[ScarecrowR31 8]

Hi wetdream (that sounds so wrong)

Keep an eye on TM. I purchased a stainless unit of TM for $150 new. Has been used for 300hrs plus with no problem. I think the guy makes them as had more than one. He isn't advertisind at the moment but was not that long ago

[Guest]

What's wrong with "Wetdream"? If we can find a virgin (failed so far in Auckland!) to do the deed on her bow, that's going to be the yachts name!! (the dinghy is called Dampatch....) Until then, she is stuck with he original name.. which is $@#^%%$$!!!! (sorry, children may read this website!)

 

(Have seen "Morning Glory" .."Errectionator"..."Hardonicus"... so don't feel so bad!!)

[waikiore 399]

:?Ah actually boys and girls, the Yanmar 2GM elbow is cast iron as are almost all elbows made at that time because it will outlast most other things, including all but the most specialised ss as mentioned, all marine only diesels come this way, having experimented with ceramic coating etc etc over the years.I found that epoxy undercoat applied to a brand new degreased elbow and baked in an oven will give best long life results. The same sort that race car engine builders sometimes use on the inside of blocks to encourage quick return of oil to the sump.

Treated this way your elbow regardless or brand will outlast most other bits, remember to work your diesel once warm, change the oil and fuel filters when doing oil changes and anodes if present, and water pump impeller then use them hard knowing it will give you very long life.

[Guest]

Oh bugger!! I was pampering mine (flowers, candy...) when I should have been chasing it with a hot iron!

Seriously though, I read that the 2GM is a "high revving" diesel and should be run at about 2800 to 3000 rpm!!! (Tried it and lost my bottle!!). I come from a family of truck drivers (those blokes who make you late for work..) who almost pat our engines at the start of the day (some do!) and it sounded LOUD!! (like the gudgeons were about to fragment!).

I figure its like anything, the more you use it, the more maintenance it requires. I have rigged up a 3 way valve in the cooling system and just before shut down now run 4ltrs of FRESH water (and saltaway) from a overhead tank so that most of the raw water is exercised!

[Guest]

:?Ah actually boys and girls, the Yanmar 2GM elbow is cast iron as are almost all elbows made at that time because it will outlast most other things, including all but the most specialised ss as mentioned, all marine only diesels come this way, having experimented with ceramic coating etc etc over the years.I found that epoxy undercoat applied to a brand new degreased elbow and baked in an oven will give best long life results. The same sort that race car engine builders sometimes use on the inside of blocks to encourage quick return of oil to the sump.

Treated this way your elbow regardless or brand will outlast most other bits, remember to work your diesel once warm, change the oil and fuel filters when doing oil changes and anodes if present, and water pump impeller then use them hard knowing it will give you very long life.

Be careful of sweeping statements, you may lead people astray. My 2gm exhaust elbow is malleable steel and is original equipment.

[wheels 543]

I need to add, SST is not always better either. It is subject to it's own issues, like Cracking due to heat and cold water introduction and mostly due to vibration.

[Guest]

Well, no call from "Eric" (?) at Whiting so rang again today... little change out of $400!!!!!

 

Going to take the old one off as a pattern and see if Grayson Engineering can make them! (Any orders??)

Will get a price.

[waikiore 399]

Well boil me in oil, and salt me to dry, Vanuatu is dead right the 2GM20 elbows are both steel items,

The raw water cooled model $348.00 and the heat exchanged model $394.00 both in stock at Whitings or any of their Yanmar agents around the country, from memory they were $250 about 22 years ago so I guess thats about right.