For that you simply use a screwdriver and do the best you can in terms of jamming it between the elbow and hose to pry it loose. Re: Yanmar 3GM30 Ehaust-manifold/mixing elbow clogged Thank you VicS for the tip on starting new thread and on the vented anti-syphon. We believe the engine had between 3000-4000 hours on it. Marine engines all have exhaust mixing elbows where the excess cooling water is injected and mixed with the exhaust gases exiting the engines exhaust manifold, this cools the exhaust and also attenuates noise levels. Problems occur when hot exhaust gases are mixed with seawater: this is a very corrosive mixture. Amazingly, the engine still ran. The yard is a Yanmar dealer and they told me the mixing elbow is not correct for this engine. Last year I helped a friend change out the mixing elbow on his 1986 Yanmar 2GM20f. Yanmar 2GM20F mixing elbow Pearson 31-2 I haven´t had a chance to start the engine to check for blowby, but removed the mixing elbow and found it was 99% blocked. In the picture, you can see the small hole just to the right of the thin metal rod. It’s about the size of an aspirin. At the end of this “wet” elbow, where the exhaust hose attaches, is where the water is introduced (hence the term “mixing elbow”) and the … 3BR4 Stainless Steel Mixing Elbow quantity Add to cart SKU: 3BR4 Category: Replacements for Yanmar Tags: 4LH-ST , 4LH-STE , 4LH-STZ , 4LH-STZAY , 4LH-UT , 4LH-UTZ , 4LH-UTZAY Here is a picture of the elbow. Buy Kit Yanmar 104214-13521 Exhaust Elbow & 104214-13580 Joint Genuine OEM: Boat Engine Parts - Amazon.com FREE DELIVERY possible on eligible purchases The mixing elbow on my 42 failed yesterday. Exhaust Mixing Elbow - Inspect & Repair Yanmar with relevance to Volvo Penta installations . Lucky for me I happened to be right off my boat yard's dock when it let go. NOTE: 1 kW = 1.3596 mhp = 1.34102 bhp Fuel condition: density at 15°C = 0.842 g/cm³ Technical data is according to (ISO 8665) / (ISO 3046) Fuel temperature 40°C at the inlet of the fuel injection pump (ISO 8665) The elbow will normally come off the manifold without to much fuss. The inner pipe of this “wet elbow” is actually/usually a 90-degree dry bend, or section, surrounded by raw water to keep the surface cool. If I do replace it and the old one is reworkable by re-welding it, I use it as a backup. This was the original elbow with no known maintenance done on it for the past 29 years. I'm waiting for a call from Catalina to get the straight scoop. As you can see it was way ready to fail. Separating the elbow from the hose can be a little bit of a chore because with all the heat, the elbow does like to essentially glue itself to the hose. My guess is my friend will up his maintenance schedule on the new elbow. 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