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by
David Pascoe |
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| From
Article
Exhaust
Risers
Page One
Photos by David H. Pascoe,
Marine Surveyor
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Mercruiser 4.2 V6 riser.
Arrow shows where corrosion hole occurred. It doesn't
take much corrosion to block these small water passages.
Note that the passages top and bottom only have
a tiny hole where it met the larger passages on
the manifold. Hard to figure this one??? |
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Merc
350 riser. Notice the difference, especially the
width of the gasket surfaces between the openings.
This one had been cleaned of scale and put back
in service. That didn't stop it from leaking and
ruining the engine, which it did. |
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This
Crusader 454 riser system is 12 years old. That's
because the riser is closed system cooled. Naturally,
it costs more money. The water induction elbow is
behind the coolant bottle and is a lesser expensive
throwaway. Notice the oil filter adapter where you
can easily reach it. |
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Crusader
riser, salt water cooled. This design uses a steel
insert ring with the water passage all around it.
It too, is narrow and over time became completely
blocked with scale. |
Go to Article
Exhaust
Risers Photos : Page Two
First posted October 23, 1998 at
www.yachtsurvey.com.
Posted January 24, 1999
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