Mercedes-benz slk 230 supercharger removal 1998-2004 pelican parts diy maintenance article wd gaster theme


The highest-performance component in the Mercedes-Benz R170 SLK Kompressor is a US-sourced Eaton supercharger. This "kompressor" is a proven Roots-type twin-rotor design, one of many Eaton forced-induction units used in several other factory-supercharged cars.

R170 SLKs use two prominent supercharger models. Pre-facelift cars (built prior to February 2000) have the 62 cubic-inch-displacement M62 model, while the later cars use the M45 model. The earlier cars have a larger pulley with electro-magnetic clutch; the M45 has a smaller pulley, no clutch, and a "snout" between the pulley and supercharger housing.

Removal methods likely vary among models. The demonstration here is on a pre-facelift 2000 SKL230 Kompressor, which has the M62 supercharger. Our car also has TLEV California emissions, which often means more clean-air plumbing than cars built for the international market.

M-B lists 1.8 hours of shop time for supercharger removal, but plan on significantly more time when doing it at home. In theory, the job is just a belt, four bolts, and a couple hose clamps. The reality is that the supercharger is tucked in tightly beneath the air cleaner housing and in front of the exhaust manifold. Access is an issue.

The max-clearance approach to supercharger removal involves draining the coolant and removing the right-side radiator hose; the fan shroud and fan also come off. (We have how-tos on those procedures.) Further, unbolting the engine mounts (please refer to that article) and raising the engine slightly gives the supercharger more breathing room in the engine compartment.

After watching a YouTube clip of a British mechanic remove the supercharger in a matter of minutes (TV magic?), we decided to attempt a minimalist approach. The upshot: It is possible to jockey an M62 supercharger out of an SLK230 Kompressor (engine 111.973) with the motor mounts and fan/shroud still intact. However, the supercharger must be removed in three pieces, and the main compressor housing will scuff the inner fender as it’s dragged out. If your car’s engine mounts and/or coolant need to be replaced anyway, the "official" steps are probably preferable, particularly if you have a second set of hands available.

Total time might be comparable: disassembling the car versus disassembling the supercharger. In addition to possible paint scrapes, removing the supercharger in pieces can tear the gasket. Luckily, Pelican Parts offers replacements: #111-098-00-80-MBZ for the fiber housing gasket, #111-098-01-80-MBZ for the rubber intake gasket.

Normally, the supercharger doesn’t need to be removed unless its bearings are whining. When the bearings wear excessively, the rotors develop excessive play, and their fins can chafe on the supercharger’s housing. Rebuild parts are available, but the average SLK owner is likely better off replacing the supercharger at that point. Replacement prices range from a few hundred bucks for functional used superchargers to around $1,200-plus for warrantied rebuilt units. Also, factory-new Eaton models are still available (#111-090-10-80-MBZ) for slightly more than $2,700 from Pelican Parts.