Part Number 91210

This universal tool has been designed to service Mercedes Benz radiator fans and pulley belts. The three-in-one design allows servicing three separate areas of repair, all of which requires a specialty tool due to their confined locations.

The first component is a 10MM hex bit (91210-2) for adjusting the air conditioning belt tension, as well as removing and installing the the idler pulley which controls this tension. For use on 1986 and later 420 and 560 cars with V8 engines. This hex must be a precise length to fit in the confined area and have a reduced diameter in order to clear the pulley. An additional benefit of this tool's design is that the 10MM hex is replaceable.

The second component is a 1/2" square drive allowing 17 and 19MM sockets to be attached for adjusting the mono belt tension on 1985 and later, 190, 260 and 300 series cars with 4 and 6 cylinder engines. In operation this specialty flat tool fits in these confined areas and loosens the power steering pump, which controls the belt tension.

The third component is an 8MM hex bit (91210-3) for removing and installing the front viscous fan on 190 and 300 series cars with 6 cylinder engines. This tool is a must for this job, as it fits between the radiator and fan and eliminates the need to R&R the radiator. An additional benefit of this tool's design is that the 8MM hex is replaceable. A separate fan clutch locking tool (see below) is required to hold the fan from turning while the 8mm hex fastener is being loosened.

Mercedes Benz Fan Clutch Locking Tools

Part Number 88550 Mercedes Benz Fan Clutch Locking Tool Open End Style (36MM)

Part Number 91220 Mercedes Benz Fan Clutch Locking Tool Locking Rod Style

Part Number 94220 Mercedes Benz Fan Clutch Locking Tool Open End Style

Part Number 61600 Universal Fan Clutch Pulley Holding Tool

These tools were designed to hold the viscous fan coupling from turning while tool #91210 loosens the 8MM socket hex fastener without removing the radiator. #88550 is used with 1994 and later C220, 2.2 liter 4 cylinder engines, #91220 is used with Model 190 and 300 Series cars with 6 cylinder engines, #94220 was designed for 1990 and later 6 cylinder models with 129 and 140 chassis and all V12 engines 1992 and later. #91220 is made with a new larger diameter and heat-treated for extra durability. #61600 is used with many later models that have the water pump pulley bolted to the water pump with the bolt heads exposed. #88550 and #94220 were designed with a 15 degree head angle and all the locking tools are heat-treated to maintain dimensional integrity.