Sierra 18-3506-1 Circulating Pump. Sierra replacement circulating pump for V6 Sterndrives. All Sierra aftermarket engine parts are manufactured to meet or exceed OEM requirements. For V6 MCM (s/n 1A063240 & up); Newer 4.3L w/o water bypass hole; Interchangeable with: Mercruiser Stern Drive; 46-879194366; 46-879194401; 46-8M0094406; 46-8M6005225 ... Most outdrives have the raw water pump inside the outdrive wrapped around the vertical shaft. This pump should be replaced each season and more often if you operate in sand, mud, or grass. If this pump fails, you will overheat the engine quickly and have some really expensive problems. Replace it!
PUMP ASSEMBLY, Water (1 required per assembly) 850399 1 - 850399 1 - PUMP ASSEMBLY Wat [ More info] In stock Replaced by 46-8M0113734 46-8M0113734 - Water Pump Assembly [ More info] $161.25 In stock. 18-3599-2 - Circulating Water Pump, Small Block Chevy [ More info] $145.49 $105.36 In stock #2 : 22-49146