Mercury and Mariner Outboard Thermostats
| HP | Year | Thermostat | Water Pump Kit |
| 50-60 HP 3 Cyl | 1991-1997 | JE-T41 (143°) / ME-T86 (120°) | |
| 70-90 HP 3 Cyl | 1987-2006 | JE-T41 (143°) / ME-T86 (120°) | FM-302 |
| 100-125 HP 4 Cyl | 1988-2006 | JE-T41 (143°) / ME-T86 (120°) | FM-302 |
| 135/150 HP V6 2.0L | 1984-2001 | JE-T41 (143°) | ME-618 |
| 150XR4 175/200 HP V6 2.4L | 1983-1990 | JE-T41 (143°) | ME-618 |
| 150 EFI-200 HP V6 2.5L | 1991-2005 | JE-T41 (143°) | ME-618 |
| 225/250 HP V6 3.0L | 1994-2001 | JE-T41 (143°) | FM-302 |
