Anyone know this Exhaust Elbow?

[Roger Long]

All the recent talk about exhaust elbows got me thinking about mine which is due for replacement. I haven't looked at it too closely because my minimal caving experience leaves me with out the spelunking skills to get a good look at it. However, the digital camera is your friend.

Does anyone recognize this water cooled elbow? I can't find one that looks like it on the net and I would like to order and have a spare on hand which I will put on next winter regardless.

I see after taking this picture that the first elbow is an un-cooled, standard street elbow but the arrangement has worked fine for the last 30 years. I believe the elbows were new when I bought the boat so have been in salt water service since 2005. They would have been in fresh water before that.

 

[sailaway78]

Looks a little like

Roger,
That looks something like the one on a 2QM15 Yanmar. I haven't owned that boat for three years, so my memory is probably a little fuzzy, but it sure looks familiar.

 

[garylinger]

That looks like a standard Yanmar configuration. What I had on my 2QM15 looked exactly like that.

 

[Roger Long]

That looks like a standard Yanmar configuration.

My engine is a 2QM20(H) and the mixing elbow shown in the engine manual looks very different.

 

[Paul F]

I believe the type you have is for a boat where the engine is below the water line. If the engine is higher an exhaust elbow is an elongated one that flows downward. Both types work in the same way mixing water with exhaust.

 

[Hermit Scott]

I have the exact same elbow on my YSM12 100 year old yanmar diesel.
edit:if you look in the picture my hand is resting on it. It looks like there is a cap of some sort pressed into the one I have.

 

[sailaway78]

My Memory

Roger,
My memory ain't what it used to be, but if it is working, I think there are two mixing elbows for the Yanmars. One for above the water line installations, and one for below. Obviously yours is the below the waterline one.

 

[kloudie1]

Exhaust Ell

Roger, it looks very much like the one on my old Yanmar 3 GMF.. has the same male/male nipple inlet.. Parts book shows that the 2 GMF and 3 GMF use the same one, # 104214-13531.(new part number may be 13521). I don't remember what size my exhaust hose is.. The picture I have doesn't show it very well, but you can see a little of it in the top left of the picture.

 

[rardiH36]

Roger:

Roger: I also have a 2QM20H. My exhaust elbow (the one with the cracks I posted about a couple of days ago ... photo again attached) is the type that is shown in the 2QM service manuals.

But here's a pic of the exhaust diagram for a Yanmar 2GM engine. Looks to be pretty darn much like yours... including the adaptor joint from "street" threads to the elbow threads. Maybe using a 2GM elbow was the PO's (or his mechanic's) work-around when it came time to replace the original part. Is there a Yanmar dealer near you to check? Could be your exhaust elbow holds up better than the QM type?

 

[jibes138]

Possible source of supply

Roger,
I have the same part currently on my M25 engine. In 2006 one of the pipes fractured on my OEM exhaust. I pulled it all and gave it to a mechanic at Spicer's Marina in Noank Ct. He replaced the original pipe with tube welded in it for the raw water with the part you show here. He pulled the part from the spare parts stock room. I would guess any marina servicing Yanmar's probably stocks them. Torresen has the yanmar elbows but no pictures to go with most of them so you really need a part number if you go that route. Maybe a call to Spicer's you could have them send one or give you a part number. i had the nipple cake up on me last fall and puled it this spring to flush the elbw out and clean the nipple. The elbow was clear of debris or salt, the water passage is a really big cavity inside there but the nipple will cake up with dried salt and or zinc fragments from the heat exchanger. I didn't notice a part number on it when I piulled it.
You should wrap that lower elbow with insulation, it is quite hot and you don't want to be melting local things or radiating the heat into the compartment, my pipes are much longer and the entire pipe is wrapped from the outlet of the exhaust manifold up to the exhaust elbow.

 

[jibes138]

maybe this is it..

I found this on the torresen web site searching on the part number from a previous post 104214
Looks the same but they added a cast nipple for the raw water instead of a tapped hole. Listed at $119.99, probably the part and not a bad price from what I've seen searching for these guys.

 

[jibes138]

an exploded view of the pic shows the nipple is actually screwed into the housing i think. Looks like a screwdriver slot in the end of it and I think I see threads sticking out a bit, it would be really had to cast the nipple on a shape like that so you could replace the supplied nipple with a right angle fitting it looks like.

 

[jibes138]

Hey while we're at it do you or any others on here have a picture of your water lift muffler? My hoses are'nt set up very good and I'm going to replace my vetus and am lookig for ideas on mounting the water lift muffler. Thanks.

 

[Roger Long]

you don't want to be ... radiating the heat into the compartment

I can tell you haven't sailed in Maine

 

[Scott]

Looks precisely like the one on my 2GM20F that I replaced this spring.

 

[Stu Jackson]

Alternative design

Roger, instead of searching for a match, functionally, why wouldn't something like this work, assuming you had the space and could find the right materials for the T?

The 2nd flix is of our new riser prefabbed from Catalina. It has to run, like Dave's, from our M25 across half of the boat. The weak link's always at the nipple. Could easily be made up locally. I could swear I posted these same two photos last week.

 

[Roger Long]

Roger, instead of searching for a match, functionally, ...

My present arrangement works well and I'd like to have matching parts on hand for minimum reworking if I have a failure during the season; especially in the middle of a trip. I located the mixing elbow on Torresen's site and will order it as soon as they can tell me why I can't get an account set up.

 

[dave lundy]

I just replaced the same part on my 3YM30. Order a new gasket for the exhaust manifold to elbow joint. Take the whole thing off and split the two sections at the male/male fitting. You'll need a good sized bench vise and a pipe wrench. Replace the supplied hose fitting with the 90 that is on your elbow now and you should be OK.

These elbows are considered comsumable items by the professional diesel techs I have consulted. Replacing mine after less than 400 hours produced a remarkable improvement in performance. The one I removed had major blockage (80%) in the exhaust section of the part. $119.00 plus about $5.00 for the gasket is what I paid through my local Yanmar dealer.

Good luck

 

[Roger Long]

The one I removed had major blockage (80%) in the exhaust section of the part.

My engine is performing right to original specs with the proper light grey smoke at max rpm so I doubt that I have any significant blockage. I try to make a practice of bringing the engine up to full continuous horsepower for at least a few minutes every time I run it and WOT for about 15 minutes every 3-4 runs to blast carbon out of the mixing elbow.

I also make my power changes very slowly when possible. Bump up or down about 200 RPM, wait for the speed and RPM to stabilize, repeat.

 

[druid]

Yup, everybody else hit it: it's an optional part for Yanmar (my installation is above WL but I sprang for the safer riser anyway). On my Catalina, I had one made up from SS pipe: worked great, lots of piece of mind.

On a diesel exhaust, bigger is ALWAYS better...

druid