32645-51020 Pump Assembly Water Pump, This unit is a rebuilt, original Mitsubishi pump. Kohler part number is GM36536. There is a $2000.00 core charge that has been included in the price.

32645-51020 is the Mitsubishi part number, Online Power products uses this part number for customer reference only. This is a rebuilt water pump assembly. This is not rebuilt by Mitsubishi. Call (805) 470-6825 with any questions.

There is a $2000.00 core charge built into the price of this pump. This will be returned once we receive the core back, in rebuildable shape. So your price will be $3750.00 after the core is received and inspected. Core must be returned within 14 days of receiving the pump.

This will be item #1 in the drawing

This pump fits several large Mitsubishi industrial/marine/generator diesel engines, models in the heavy-duty series, including:

•  S6R

•  S6R2

•  S12R

•  S12H

•  S12A2

•  S16R

•  S8U

•  S12U

Note that part numbers can have slight variations or supersessions over time (e.g., related numbers like 32645-50020 appear in similar contexts), but 32645-51020 specifically cross-references to the above engines in available sources.

For exact fitment on a specific machine or serial number, consult an official Mitsubishi parts catalog, dealer, or cross-reference tool, as compatibility can depend on exact engine variant or revisions. 

Online Power Products can verify the part number just email us the serial number off your machine.

Online Power Products does not represent Mitsubishi or any other manufacture that use this particular pump in a Mitsubishi powered piece of equipment.

Online Power Products warrants this pump for 1 year or 500 hours. Warranty applies to the pump only, Online Power Products does not warranty any labor, rental, or loss of generator use, for any reason.