Fretting corrosion is from low frequency vibration and not from exposure to
moisture or oxygen. One of the historic examples of fretting corrosion is
trailers on railroad flatbeds. This was overcome by only shipping only the
cargo container and not the wheel and axle structure. I think you are
referring to standard oxidation corrosion. The best way to avoid this is to
routinely rotate the gears so that they keep a coating of oil.
Regards,
Phil Roettjer
-----Original Message-----
From: keith franck [mailto:kdfranck@pacbell.net]
Sent: Friday, June 14, 2002 11:03 AM
To: lotus-cars@yahoogroups.com; vintage-race@autox.team.net
Subject: Hewland Fretting
Our Mk5 has always had some fretting corrosion happening within the gear
clusters and I'm wondering if anyone's solved this problem. There's
additives available which might slow or prevent it but the ratcheting
type limited slip unit might be adversely affected as a result. The
other possibility which comes to mind is an inert gas purge of the
oxygen out of the gearbox prior to it's operation. We're using Redline
synthetic gearlube. Anyone have some expertise on this subject?
--
Keith Franck
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