The newly rebuilt engine ready for installation .

One common problem with older six cylinder engines is the elbow where the engine joins the exhaust pipe . This is the original elbow . The problem with this design is that the cooling water that gets pumped into the exhaust pipe doesn't actually cool the first few inches of the elbow . The result is that the first section of the pipe runs as hot as a car exhaust pipe and acts like a heater inside of the engine box . This elbow was obviously pumping a lot of exhaust fumes into the boat through the hole shown here .

 I designed this replacement elbow and had it silver brazed at a local machine shop. The inner pipe is totally surrounded by a cooled water jacket that drains into the lower half of the exhaust . I've used this type of elbow on several boats and it keeps the engine room much cooler .