Mark.Napier(at)sciatl.com
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 Posted: Thu Jul 13, 2006 12:11 pm Post subject: Rotax 532 a Boat Anchor? - 582 improvements |
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bearings. I replaced the crankshaft assembly in my '91 vintage grey
head for that reason. It already had the newer style harmonic dampener
and starter gear assembly.
The next upgrade was the ceramic water pump seal. For cost reasons I
elected to keep the old style seals along with an extra rubber seal that
is retained by a metal keeper. Both spaces around the shaft are stuffed
with silicon-based grease that keeps the water away from the seals. At
150 hours and counting from the rebuild I've had no problems. It's time
to do a de-carbon and I'll replace them all again then.
The last upgrade was the re-circulating water system. That is supposed
to help reduce the probability of cold-seizing the engine. By
re-circulating the water the inlet temperate to the block is raised. I
have thought about upgrading but the part costs talk me out of it very
quickly. A working solution is to regulate the cooling air to the
radiator to keep the water temps up where they should be. I'm also very
careful about slowly adding in power after a long cold descent until I
see the water temps well above the thermostat opening point.
Anyway, I hear the most single important thing for cold seizures is
making sure the ring and piston clearances are not too tight.
FWIW,
Mark Napier
- - - - - Appended by Scientific Atlanta, a Cisco company - - - - -
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