ARCO 4-Screw MerCruiser Tilt Trim Reservoir Kit

The ARCO M532 reservoir kit is intended for MerCruiser tilt and trim systems using the ARCO 6275 motor and the four-screw reservoir mounting pattern. It replaces the reservoir used with MerCruiser 883166A2 applications. The mounting style is an important distinction because visually similar trim reservoirs can use different attachment patterns. Confirming the existing pump and reservoir before disassembly helps avoid opening the hydraulic system for the wrong replacement part.

This kit is meant to restore the reservoir portion of the trim pump assembly without requiring replacement of the entire electric motor and pump. The supplier specifically identifies the four-screw mount, making that feature the primary installation check in addition to the ARCO 6275 application. Service should be performed with the surrounding area clean so dirt does not enter the trim fluid during reservoir replacement. Inspect the existing sealing surfaces and hardware while the reservoir is removed, since damage elsewhere can cause leakage even with a new tank installed.

After the reservoir is fitted, refill and bleed the tilt and trim system using the applicable MerCruiser service procedure. Cycle the system and check for seepage around the reservoir joint before the repair is considered complete. ARCO lists 12-month parts-and-labor warranty protection for this replacement component. The MerCruiser 883166A2 cross-reference provides an additional part-number check when the original reservoir is still available.

• Four-screw reservoir mounting pattern
• Designed for the ARCO 6275 tilt motor application
• Cross-references MerCruiser 883166A2
• Allows reservoir service without replacing the complete trim motor

For related MerCruiser tilt and trim repair components, Browse more Tilt & Trim Motors for related replacement and service components.