| [GMCnet] bearings and filters [message #208835] |
Sun, 26 May 2013 11:48  |
KB
Messages: 1262
Registered: September 2009
Karma:
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Senior Member |
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Our engine developed a knock this week. The current
theory is it's a rod bearing problem. The engine was rebuilt
about 12K miles ago by a reputable re-builder, and ran well
until now. This naturally leads me to the question:
why this early bearing failure? (assuming that's what it is)
A brief search online shows that a leading cause of bearing
failure is debris in the oil. So why wouldn't this get
filtered out before doing damage? My theory is: the bypass
oil filter (WIX 51258). About 2 hours before the knock started,
my better half decided, for the first time, to see what 100%
throttle (WOT) would do on a freeway on-ramp. As I understand
it, during WOT conditions, the oil filter bypass opens,
and unfiltered oil flows into the engine. Seems like a
bad idea to me, since any junk in the oil can rapidly
plug passages or ruin bearings.
So: why do we need a bypass filter? Can we get a filter
without one, and would that be a good thing??
thanks
Karen
1973 23'
1975 26'
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Karen
1975 26'
San Jose, CA
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