the fresh water in a freshwater cooled engine needs to be cooled. either you have a keel cooler
for it or you have a heat exchanger
in the saltwater system. So unless you have a keel cooler
type system, you'd be wise to follow the passages of the salt water
from the pump to the mixing elbow
. impeller peaces that have made it past that point won't be clogging anything.
as far as the exhaust hoses? if one is bad, replace that whole section. cutting out a section and coupling in a newer piece is not advisable, as the hose barb is smaller than the hose diameter and causes back pressure in the exhaust. buying
a full length of hose verses buying
a hose + hose barb isn't going to save you much money
, not to mention the extra costs due to the restriction in the hose...ie...more fuel consumption
, carbon build up in the cylinders and more... in an emergency
? by all means it will work till you get to a point to fix it proper. if it's about saving money
, it won't save you a dime, in fact it will cost you more. Being cheap
is a very expensive way to live. Frugal and cheap
aren't even close in definition.
No smoke, but lots of smell? is the smell down below or in the cockpit
. inside; leaky exhaust...ie... bad hose, loose hose clamp,leaking exhaust manifold gasket
... outside; leaky injector, bad fuel
and/or slightly worn rings consuming a small amount of oil
and even leaky valves. putting clean fuel in does not say clean fuel system. sh&7 in the tank will mix into the "clean" fuel. can't reach the exhaust port? get in the dinghy
or put a clean rag on a stick and hold it down to the exhaust for a while. when you retrieve it, feel it, if it feels really oily, then you know you have fuel and/or oil
getting by. you won't always "see" the oiliness till it gets really bad...ie..oil sheen in the water or smoke. if you'r running down wind
you'll smell fumes. an inexperienced person will think "bad" experience will tell if its too much or normal. oiliness in the exhaust will say too much. is the transom collecting soot? there again too much. the water in the exhaust isn't for smell. it's to cool the non-metal parts
and to help silence it.
an exhaust system is designed to have a certain amount of back pressure. some engines more than others. like a yanmar
verses a westerbeke
of the same horsepower. the yanmar
has a larger diameter exhaust system, hence less back pressure. if you go less back pressure than an engine is designed for, you'll burn the exhaust valves, but increased horsepower, for a time. and too much back pressure will cause carbon build up and higher fuel consumption
along with decreased horsepower and overheating
. both are high cost and unreliable.