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Changing a Cummins Marine 4B, 4BT 3.9, or a 6B, 6BT, 6BTA 5.9 Thermostat

Front of the Cummins Marine 6BTA
Front of the Cummins Marine 6BTA
Belt Wrap and Thermostat Location on the Cummins Marine 6BTA
Belt Wrap and Thermostat Location on the Cummins Marine 6BTA
Un-bolt the Alternator Bracket
Un-bolt the Alternator Bracket
Swing the Alternator Away
Swing the Alternator Away
Thermostat Housing Bolts
Thermostat Housing Bolts
Thermostat Housing
Thermostat Housing
Lifting Plate Between Housing and Head
Lifting Plate Between Housing and Head
Thermostat in Housing
Thermostat in Housing
Remove Hose with Housing
Remove Hose with Housing
OEM Thermostat
OEM Thermostat
OEM and SMX 160F Thermostat
OEM and SMX 160F Thermostat
Cleaned Housing and Plate
Cleaned Housing and Plate
Rectorseal 5 on Thermostat Seal
Rectorseal 5 on Thermostat Seal
New Thermostat in Housing
New Thermostat in Housing
Rectorseal on Hardware and Surfaces
Rectorseal on Hardware and Surfaces
Rectorseal Mating Surface and Bolt Holes
Rectorseal Mating Surface and Bolt Holes

Compliments of  a rock solid Boat owner/operator,

Robert Schepis