Gary, My 38 mk1 has a Universal 4-cyl 36 HP engine with the exhaust on the port side of the engine, so the geography of my installation may be a bit different than yours. But here goes.
There is no room on the port side of the engine compartment aft of the engine. The location of the fuel tank and the proximity of the coupling and shaft make access to what space is there very much a problem. The PO had converted from the original A4 to a Universal diesel, and cut several corners in the process which caused the engine to sieze and caused me to replace it back in 2010 (with another M35B, but that is a different story.) Because the boat had originally had an A4, the exhaust port in the transom was 1 1/2" diameter. The PO also used 1 1/2" hose from the muffler aft to the exhaust port. The original consequence of the situation was that exhaust pressure would spray a rooster tail of water behind the boat, and I was constantly getting calls on the VHF from other boats telling me about it. After a few months, I put a hose elbow on the outside of the exhaust. There was still spray that got blown into the boat going downwind, but at least no roostertail. When I replaced the engine, I decided to do the exhaust according to the engine manufacturer's recommendations. So there is a 2" riser/mixing elbow on the exhaust manifold. The 2" hose goes from the port side of the engine, behind the heat exchanger, to the starboard side of the engine compartment where is connects to a Vernalift muffler mounted near the through hull for the engine cooling water. A 2" hose comes vertically out of the muffler and is clamped into the forward inside corner of the cockpit lazarette on the starboard side. Just below the lid ( and close to 4 feet above the waterline) is an elbow that takes the hose aft and sloping downward toward the stern. The hose is pretty stiff and needs only about 2 clamps to keep it secure and out of the way of access into the lazarette. The exhaust port in the transom had been in the category of minor PITA for years, so I decided to take it out altogether. In its place I put a 2" stainless exhaust port (with a stainless flapper valve that is normally closed to prevent waves/water from coming back into the exhaust hose) about 12" above the waterline and under the curve of the transom. That greatly simplifies hose routing and access. Plus now I don't have exhaust and water shooting aft into the dinghy when I tow it. Bought the port on EBay for around $50. If you are interested, I can send photos of the installation to you off list. Regarding access to the area inside the transom. On my boat there is a stern ladder and stern light in the transom, plus the old exhaust outlet. The PO had put 6" Beckson access ports in the aft bulkhead of the cockpit to provide access to the inside of the transom. As part of my refit, I opened up the area on either side of the stiffener to which the backstay is attached and installed two larger rectangular Beckson hatches that are about 12" x 16" and give a 10x14 opening on each side. I have some Pfeiffertex material normally used for tramps on small catamarans, and one of the projects for the spring will be to install a net from the aft end of the cockpit sole to the transom so the area under the aft deck can be used for storage of spare lines, fenders, and other oddments. I was aboard another 38 in the Elizabeth City, NC area where an owner had removed an area about 3 feet wide and 30" tall from the aft bulkhead of the cockpit, and installed a removable panel in its place. It was a nifty means of access to the area inside the transom and also large enough to get down inside for access to the steering quadrant. BTW, if you or anyone else is interested, I have two new mufflers I would be willing to sell very cheaply. One is a compact Vernalift about 7" diameter by 7" tall with 2" top in and top out. The other is a Vetus waterlock muffler with both 1 1/2" and 2" in and out ports that can be turned to almost any angle from horizontal to vertical. If anyone needs a muffler, make me an offer. Rick Brass Washington, NC -----Original Message----- From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of ahycr...@cox.net Sent: Wednesday, January 22, 2014 5:06 PM To: cnc-list@cnc-list.com Subject: Stus-List hose yesterday I picked up a new mixing elbow assembly for our yanmar 3gm30. The old one was just about closed up with rusty carbon and crud I'm surprised the engine worked at all ! The next thing on the list is the flex hose that goes from the water muffler to the transom. I'm not to sure about trying to wiggle all the way back there you know it has to be a 2 way trip ! Has anyone been down this road before and if so any advice ? Liberty is a 38 foot Mark I and it looks as though the transom is about 42 feet in back of the rudder shaft. Gary Kolc _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
