Elbow pain?

[Thom Hoffman]

One of the projects I'll likely be getting into this summer is the replacement of the mixing elbow on the YANMAR 2QM15 in our H30('81). I'd appreciate any helpful dos and don'ts that folks may have developed from their own experiences with similar projects. It's probably original equipment and getting it disconnected in the confined quarters of the engine compartment may drive me to cursing, tears, and liquor--maybe not in that order. Since the boat is in the water, guidance on extra tools, supplies, etc. that may be needed will no doubt make the project a little less frustrating and lessen my loss of blood in the effort.

 

[John K Kudera]

How To

The elbow is fastened to the engine with four bolts, I would locate them, and loosen them maybe one turn, next remove the hose clamps from the hose, push a rather flat screw driver between the hose and the elbow,spray a WD40 type product in the joint to help loosen the hose, repeat all around the hose until it comes off. Remove the water inlet hose, remove the four bolts, tap the elbow lightly, should come off. The flange where the elbow attaches has a gasket, order that when you order the elbow. I did not use a sealant on my gasket, don't think sealant is needed.Don't try and clean out the elbow, just bite the bullet and buy a new one.Good luck!

 

[J. Tesoriero]

One thing leads to another....

If the elbow is original equipment, I'll bet the entire exhaust system needs a look at. I had to do mine a few years back ('80 Hunter 30). It is easier to lay on top of the (cold) engine and work on the system than trying to work through the small access door in the quarter berth. The elbow came off relatively easily, and it even unscrewed from the plate that attaches it to the exhaust manifold. If I remember correctly, there is an odd copper gasket that is required for a good seal. This is also a good time to rinse any accumulated mud/sand/crud from the raw water jacket of the exhaust manifold. You should be able to detach the exhaust hose from the thru hull and pull the entire assembly forward - from under the batteries and fuel tank. The original muffler was a SS, water-lock muffler. That muffler is no longer manufactured, but a Primex fiberglass replacement can be purchased from Marine Mufflers, part Number MC2. Call 407-886-1144, or contact Hunter Marine.

 

[DJ Dreyer]

How I did mine

I have a 3 GMF on my 84 34. I remove the exhaust and water hoses and then the 4 nuts that hold the assembly onto the engine manifold. I could then take the whole thing home to work on it. I used a very large pipe wrench (30 inches or larger I think, Home Depot, Made in China one) and a 1 or 1.5 inch pipe about 3 feet long. Put the pipe in the inlet of the exhaust (the "exhaust elbow") and then used the wrench to unscrew the "mixing elbow" (where the water is injected into the exhaust) that is joined to the exhaust elbow with a SS coupling. This is not easy but if you use your head and are careful it can be done safely. A large vice on a heavy work bench would make things easier.Get a new coupling (they do wear out) and a new mixing elbow and put it all together using exhaust manifold anti seize compound (auto store) to make it easier to do this again. I used some Hi temp silver paint on the assembly after putting it back together to get uniform color and make all parts look like new.Use new gasket between assembly and engine manifold and put it back onto the engine with the 4 nuts. Put hoses back on and boat safely.DJ

 

[Bill O'Donovan]

Archives too

One fellow posted pix, and they weren't too bloody. Good advice to NOT clean the old one. Use new, for sure.

 

[Andy Howard]

Elbow pain relief

Removing the assembly with the 4 bolts is the easy part, the pain is unscrewing the elbow. I dropped mine off at a auto repair shop, had lunch and picked it up an hour later with the new elbow attached. Cost; 20 bucks. Not having to worry about vises, pipe wrenches, and blow torches; priceless.