Sierra 18-3321 Water Pump Housing Kit - Mercruiser

Sierra 18-3321 Complete Water Pump Repair Kit for select early MerCruiser No. 1 sterndrives with flush, serial numbers 2495186–2763441. This marine engine cooling and raw-water pump replacement kit includes the water-pump housing, pump base, impeller, wear plate, water-tube guide, seals, O-rings, and installation gaskets. Designed to meet or exceed OEM specifications and restore reliable cooling-water circulation. Fits select 1967–1969 MerCruiser 120 HP, 140 HP, and 160 HP stern-drive applications. Cross-references Mallory 9-48308, GLM 12130, and Recmar 46-96148A8. Ideal for boat maintenance, marine water-pump repair, impeller replacement, sterndrive service, and MerCruiser cooling-system restoration. Verify engine model, drive type, and serial number before ordering.