Springy thingy?
#2
That's the hot idle compensator.
Under the cover is a bimetallic strip with a rubber end, which closes an air bleed hole that goes into the manifold.
When the engine gets hot (such as idling in traffic on a hot day) the strip deflects, opening the hole, and allowing in extra air to lean out the mixture to prevent an over-rich condition.
The spring there is a button you can use to hold the valve closed when tuning a hot engine, so as to make your settings accurate.
See your '68 Chassis Service Manual.
- Eric
Under the cover is a bimetallic strip with a rubber end, which closes an air bleed hole that goes into the manifold.
When the engine gets hot (such as idling in traffic on a hot day) the strip deflects, opening the hole, and allowing in extra air to lean out the mixture to prevent an over-rich condition.
The spring there is a button you can use to hold the valve closed when tuning a hot engine, so as to make your settings accurate.
See your '68 Chassis Service Manual.
- Eric
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labrats804
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May 30th, 2007 08:30 AM