The Saturn CVT transmission, using Dacco number HMS-2 converter, is gaining popularity fast. Now is the time to capitalize on a growing market. This converter is simple to rebuild, cores are currently readily available, and part failure is minimal. One area of critical concern is broken damper springs and/or rivets. Thorough inspection is required before rebuild. If the impeller bushing is as good as new, reuse is permitted; however, if replacement is needed, be sure to use the OEM-type coated bushing. The Teflon coating ensures wear protection.
Another area of concern is inspection of the plastic-type stator. Inspect thrust surface for damage. If damage is found, replacement of the stator is necessary. The sprag assembly needs to be removed and cleaned, and carefully inspected for common spring failure. It is recommended to replace with new at the time of rebuild. Many of these units experience worn clutch lining and need to be replaced with new high carbon liners. The front bearing is the same bearing currently used in the 4T60 converter, popular among GM vehicles with a 245mm converter. Cost is minimal and replacement should be considered. Close clearance should be restricted to .017. Following these simple guidelines will help construct a seamless rebuild.
– Found in May 2008 Newsletter