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 .