Cooling Systems - Thermostat Housings

Lower Thermostat Housing Gasket - Models 120, 140, 120R/140R, 160, 165 and 200

Manufactured by Barr Marine. Part number MC47-27-33680.

Direct replacement upper thermostat housing.

Replaces MerCruiser 60372A2 and Sierra 18-1969.

Fits these applications:

• MerCruiser 4 cylinder 153 C.I.D. 120 H.P., Model 120 engine (log style direct replacement).
• MerCruiser 4 cylinder 181 C.I.D. 140 H.P., Model 140 engine (log style direct replacement).
• MerCruiser 4 cylinder 153 and 181 C.I.D., 120 H.P. (2.5L) and 140 H.P. (3.0L), Models 120R and 140R-MR/Alpha 1 (log style direct replacement).
• MerCruiser straight 6 cylinder Model 165 (log style direct replacement).

Compatible parts:

• MC-1-52390 direct replacement water cooled exhaust manifold. For serial # 3332138 and up.
• MC-1-58759 direct replacement water cooled manifold to fit the 6 cyl. GM (Model 165) engine.
• MC-1-63122 direct replacement water cooled exhaust manifold.
• MC-1-95862 direct replacement water cooled manifold (Rochester (3 1/4" X 1 7/8") bolt pattern). 6 bolt mounting.
• MC-1-96705 direct replacement water cooled manifold (Rochester (3 1/4" X 1 7/8") bolt pattern). 6 bolt mounting.
• MC-1-99798 direct replacement water cooled manifold (MerCarb (3 11/16" X 2") bolt pattern). 6 bolt mounting.
• MC-20-12076 direct replacement exhaust riser.
• MC-20-55538 direct replacement exhaust elbow/ riser.
• MC-20-60426 direct replacement exhaust elbow riser (utilizes a stainless steel sleeve at the water/air mixing area).
• MC-20-76325 direct replacement exhaust riser.
• MC-20-76351 direct replacement exhaust elbow riser.
• MC-20-61851A3 manifold to riser 3" spacer (single block). Includes all mounting hardware, gaskets and drain plug.

Manufactured by Barr Marine. Part number MC-29-60372.

Lower Thermostat Housing Gasket - Models 888, 225 (Ford), 233 (Ford) and 255 (Ford)

Manufactured by Barr Marine. Part number MC47-27-54506.

Upper Thermostat Housing Gasket - Models 888, 225 (Ford), 233 (Ford) and 255 (Ford)

Manufactured by Barr Marine. Part number MC47-27-60208.

Lower Thermostat Housing - Models 888, 225 (Ford), 233 (Ford) and 255 (Ford)

Replaces MerCruiser 60783A3.

Manufactured by Barr Marine. Part number MC-29-60783.

Lower thermostat housing.

Replaces MerCruiser 63588A1.

Fits MerCruiser V8 (Ford) 302 and 351 C.I.D., Models 188, 215, 225, 233, 255 and 888 inboard and I/O units (log style direct replacement).

Compatible parts:

• MC-1-65603 direct replacement water cooled exhaust manifold (starboard side).
• MC-1-65604 direct replacement water cooled exhaust manifold (port side).
• MC-20-60426 direct replacement exhaust elbow riser (utilizes a stainless steel sleeve at the water/air mixing area).
• MC-20-76351 direct replacement exhaust elbow riser.
• MC-20-76771 direct replacement exhaust elbow riser.
• MC-20-61851A2 manifold to riser 3" spacers (sold in pairs). Includes all mounting hardware, gaskets and drain plugs.

Manufactured by Barr Marine. Part number MC-29-63588.

Upper Thermostat Housing - Models 888, 225 (Ford), 233 (Ford) and 255 (Ford)

Replaces MerCruiser 59498A1.

Manufactured by Barr Marine. Part number MC-29-59498.

Upper thermostat housing.

Replaces MerCruiser 62898A1.

Fits MerCruiser V8 (Ford) 302 and 351 C.I.D., Models 188, 215, 225, 233, 255 and 888 inboard and I/O units (log style direct replacement).

Compatible parts:

• MC-1-65603 direct replacement water cooled exhaust manifold (starboard side).
• MC-1-65604 direct replacement water cooled exhaust manifold (port side).
• MC-20-60426 direct replacement exhaust elbow riser (utilizes a stainless steel sleeve at the water/air mixing area).
• MC-20-76351 direct replacement exhaust elbow riser.
• MC-20-76771 direct replacement exhaust elbow riser.
• MC-20-61851A2 manifold to riser 3" spacers (sold in pairs). Includes all mounting hardware, gaskets and drain plugs.

Manufactured by Barr Marine. Part number MC-29-62898.

Lower Thermostat Housing - Models 330 (GM)

Manufactured by Barr Marine. Part number MC-29-79468.

Lower thermostat housing.

Replaces MerCruiser 78984A1, HGE 8984 and Sierra 18-1993.

Fits these applications:

• MerCruiser V8 198, 228, 255, 260 and 898, inboard and stern drive units (log style direct replacement).
• MerCruiser V8 225, 250, 255, 270 and 280, inboard and stern drive units (log style direct replacement).

Compatible parts:

• MC-1-47737 direct replacement water cooled exhaust manifold (port side).
• MC-1-47738 direct replacement water cooled exhaust manifold (starboard side).
• MC-1-77234 direct replacement water cooled exhaust manifold (port side).
• MC-1-77235 direct replacement water cooled exhaust manifold (starboard side).
• MC-20-60426 direct replacement exhaust elbow riser (utilizes a stainless steel sleeve at the water/air mixing area).
• MC-20-72963 direct replacement exhaust elbow riser.
• MC-20-76351 direct replacement exhaust elbow riser.
• MC-20-76668 direct replacement exhaust elbow riser.
• MC-20-76771 direct replacement exhaust elbow riser.
• MC-20-61811A4 manifold to riser 3" spacers (sold in pairs). Includes all mounting hardware, gaskets and drain plugs.
• MC-20-61851A2 manifold to riser 3" spacers (sold in pairs). Includes all mounting hardware, gaskets and drain plugs.

Manufactured by Barr Marine. Part number MC-29-78984.

Upper thermostat housing.

Replaces MerCruiser 47441A1, Osco MC55-TSB and Sierra 18-1977.

Fits these applications:

• MerCruiser V8 198, 228, 255, 260 and 898, inboard and stern drive units (log style direct replacement).
• MerCruiser V8 Models 898R, 228R and 260R (center riser direct replacement).
• MerCruiser V8 225, 250, 255, 270 and 280, inboard and stern drive units (log style direct replacement).
• MerCruiser V8 325, 330, 350, 370 and 400, inboard and stern drive units (log style direct replacement).

Compatible parts:

• MC-1-47735 direct replacement water cooled exhaust manifold (port side).
• MC-1-47736 direct replacement water cooled exhaust manifold (starboard side).
• MC-1-47737 direct replacement water cooled exhaust manifold (port side).
• MC-1-47738 direct replacement water cooled exhaust manifold (starboard side).
• MC-1-77234 direct replacement water cooled exhaust manifold (port side).
• MC-1-77235 direct replacement water cooled exhaust manifold (starboard side).
• MC-1-87114 direct replacement water cooled exhaust manifold.
• MC-20-44354 direct replacement water cooled center discharge riser. Accepts 4" I.D. exhaust hose (8 degree angle).
• MC-20-60426 direct replacement exhaust elbow riser (utilizes a stainless steel sleeve at the water/air mixing area).
• MC-20-72963 direct replacement exhaust elbow riser.
• MC-20-76351 direct replacement exhaust elbow riser.
• MC-20-76668 direct replacement exhaust elbow riser.
• MC-20-76771 direct replacement exhaust elbow riser.
• MC-20-98502 direct replacement water cooled center discharge riser. Accepts 3" I.D. exhaust hose (0 degree angle).
• MC-20-98504 direct replacement water cooled center discharge riser. Accepts 3" I.D. exhaust hose (15 degree angle).
• MC-20-61811A4 manifold to riser 3" spacers (sold in pairs). Includes all mounting hardware, gaskets and drain plugs.
• MC-20-61851A2 manifold to riser 3" spacers (sold in pairs). Includes all mounting hardware, gaskets and drain plugs.
• MC-20-93320A3 manifold to riser 3" spacer blocks (pair) with fastener and gasket package.
• MC-20-93322A3 manifold to riser 6" spacer blocks (pair) with fastener and gasket package.

Manufactured by Barr Marine. Part number MC-29-47441.

Lower Thermostat Housing Gasket - Models 225 (GM), 260, 228, 898/198

Replaces Sierra 18-2917.

Manufactured by Barr Marine. Part number MC47-27-53045.

Upper Thermostat Housing Gasket - Models 225 (GM), 260, 228, 898/198

Replaces Osco 48818 and Sierra 18-2844.

Manufactured by Barr Marine. Part number MC47-27-48818.

Upper thermostat housing.

Replaces MerCruiser 47442A1 and Osco MC55-TBB.

Fits MerCruiser V8 Models 330, 340 and 454 Magnum, inboard and stern drive units (center riser direct replacement).

Compatible parts:

• MC-1-89011 direct replacement water cooled exhaust manifold.
• MC-20-44354 direct replacement water cooled center discharge riser. Accepts 4" I.D. exhaust hose (8 degree angle).
• MC-20-98502 direct replacement water cooled center discharge riser. Accepts 3" I.D. exhaust hose (0 degree angle).
• MC-20-98504 direct replacement water cooled center discharge riser. Accepts 3" I.D. exhaust hose (15 degree angle).
• MC-20-93320A3 manifold to riser 3" spacer blocks (pair) with fastener and gasket package.
• MC-20-93322A3 manifold to riser 6" spacer blocks (pair) with fastener and gasket package.

Manufactured by Barr Marine. Part number MC-29-47442.

Lower thermostat housing.

Replaces MerCruiser 78985A1 and Osco MC553-BB.

Fits MerCruiser V8 325, 330, 350, 370 and 400, inboard and stern drive units (log style direct replacement).

Compatible parts:

• MC-1-47735 direct replacement water cooled exhaust manifold (port side).
• MC-1-47736 direct replacement water cooled exhaust manifold (starboard side).
• MC-20-72963 direct replacement exhaust elbow riser.
• MC-20-76668 direct replacement exhaust elbow riser.
• MC-20-61811A4 manifold to riser 3" spacers (sold in pairs). Includes all mounting hardware, gaskets and drain plugs.

Manufactured by Barr Marine. Part number MC-29-78985.

Upper Thermostat Housing Gasket - Models 185R and 898R/228R/260R

Replaces Osco 41812 and Sierra 18-2554.

Manufactured by Barr Marine. Part number MC47-27-41812.

Thermostat housing assembly for dual pump cooling system on Oldsmobile V8's (350, 403 and 455 C.I.D.).

Manufactured by Barr Marine. Part number OR-29-74.

Thermostat housing gasket used in Barr Marine thermostats.

Manufactured by Barr Marine. Part number OR-29-74C.

OMC lower thermosat housing.

Manufactured by Barr Marine. Part number OMC-29-910303.

OMC thermostat housing.

Manufactured by Barr Marine. Part number OMC-29-908216.