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Replacing An Outboard Water Pump


As a general rule of thumb, the water pump impeller should be replaced every other season. A water pump repair kit is available for almost all outboard models. For steps requiring lubrication use BRP Triple-Guard Marine Grease or Mercury 2-4-C Marine Lubricant.

Step 1: Step 1

Shift your motor into reverse gear

Step 2: Step 2

Remove the bolts that attach the lower unit to the midsection

Step 3: Step 3

Disconnect the shift rod
Not all shift rods disconnect in the same way. Some disconnect up by the powerhead, some disconnect below the swivel bracket, and some disconnect above the gearcase.

Step 4: Step 4

Remove the lower unit

Step 5: Step 5

Remove the bolts on the water pump housing

Step 6: Step 6

Remove the water pump housing and impeller from gearcase

Step 7: Step 7

Also remove the wear plate and gaskets from the gearcase

Step 8: Step 8

Install new water pump wear plate and gaskets on gearcase

Step 9: Step 9

Lubricate impeller cup, keyway, and driveshaft

Step 10: Step 10

Install impeller so that it lines up with impeller key

Step 11: Step 11

Install water pump housing
Turn driveshaft as you place the housing on top of the impeller. You will turn the driveshaft clockwise for standard (right hand) rotation models

Step 12: Step 12

Tighten housing bolts in crisscross pattern to assure proper gasket sealing.

Step 13: Step 13

Place new water tube seal in water pump housing

Step 14: Step 14

Line up driveshaft, water tube, and shift rod while installing lower unit

Step 15: Step 15

Lubricate and install bolts that attach lower unit to the midsection

  • You may need to connect the shift rod before bolting up the lower unit

Step 16: Step 16

Run motor with flusher to make sure the tell tale stream is constant

BRG206R - Evinrude 2-Cylinder 40-60HP E-TEC 2004-2012
BRG406N - Johnson-Evinrude V4 Large 90-140HP 1992-2012
BRG404R - Johnson-Evinrude V4 Small 85-140HP 1978-1998

FRG397N - Force 3-Cylinder 75-90HP 1995-1999
FRG495N - Force 4-Cylinder 120HP 1995-1999
MYG307N - Mercury/Mariner 3-Cylinder 70-90HP 1987-2006
MYG304R - Mercury/Mariner 3-Cylinder Bigfoot 60HP 1995-2007
MYG313N - Mercury/Mariner 3-Cylinder DFI (Optimax) 75-115HP 2004-2014
MYG402R - Mercury/Mariner 4-Cylinder "L4" 100-125HP 1988-2006
ME-G4-15-N - Mercury/Mariner 4-Cylinder 4-Stroke 150HP 2011-2015
MYG408R - Mercury/Mariner 4-Cylinder 4-Stroke 75-115HP 2000-2015
MYG411N - Mercury/Mariner 4-Cylinder Verado 135-200HP 2006-2015
MYG618N - Mercury/Mariner 6-Cylinder Verado 200-300HP 2005-2015
MYG623R - Mercury/Mariner TorqueMaster 225-250HP 2005-2013
MYG608AN - Mercury/Mariner V6 1.87:1 Gear Ratio 150-200HP 1979-2015
MYG605AN - Mercury/Mariner V6 2.00:1 Gear Ratio 135-150HP 1979-2001
MYG616AN - Mercury/Mariner V6 3.0L 200-250HP 1994-2015

YMG403R - Yamaha 4-Cylinder 4-Stroke 115HP 2000-2015
YMG406R - Yamaha 4-Cylinder 4-Stroke 150HP 2004-2015
YMG402R - Yamaha 4-Cylinder 4-Stroke 75-100HP 1999-2015
YMG601R - Yamaha V6 150-200HP 1988-2007
YMG604R-B - Yamaha V6 150-200HP PRO-V/V-MAX 1986-2014
YMG607R - Yamaha V6 3.1/3.3L 200-250HP 1990-2005
YMG607BR-A - Yamaha V6 3.3L 200-300HP VZ HPDI 2003-2008
YMG623R - Yamaha V6 3.3L 300HP HPDI 2004-2006
YMG613AR - Yamaha V6 4-Stroke 200-225HP 2002-2010
YMG618R - Yamaha V6 4-Stroke 250HP 2005-2014
YMG605R - Yamaha V6 Excel Spanner-Nut Style Lower Unit