Various articles covering frequently asked questions, informative bits of information, and even a spot of humor.
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OEM engine coolant hose for Universal engines. This pre shaped hose goes between the fresh water pump and the water flange mounted below the thermostat housing.
Catalina would often use a pair of these hoses with adapters for plumbing in the water heaters on the later B series engines as shown in the the secondary image.
It corresponds to part number 8 in the exploded view of the cooling system and is the thermostat bypass hose. At start up, when the engine is cool, it allows water to bypass the engine block and pass through the hole in the closed thermostat and circulate, thereby preventing the exhaust manifold from overheating.
OEM Equipment for the following engine models (and the boat that we are aware used these engines... There could be other combinations as well):
• M-18 (Catalina 27, Catalina 30)
• M-25 (Catalina 30)
• M-25XP (Catalina 28, Catalina 30, Catalina 34, Catalina 36)
• M-25XPB (Catalina 28 MkII, Catalina 30 MkIII, Catalina 310) (QTY 2 water heater plumbing)
• M-35 (Catalina 34, Catalina 36, Catalina 38)
• M-35B (Catalina 34 MkII, Catalina 350, Catalina 36 MkII)(QTY 2 water heater plumbing)
• Inside diameter: 3/8"
• Length: 3-3/4" 300236
OEM engine coolant hose for Universal engines. This pre shaped hose goes between the fresh water pump and the water flange mounted below the thermostat housing.
Catalina would often use a pair of these hoses with adapters for plumbing in the water heaters on the later B series engines as shown in the the secondary image.
It corresponds to part number 8 in the exploded view of the cooling system and is the thermostat bypass hose. At start up, when the engine is cool, it allows water to bypass the engine block and pass through the hole in the closed thermostat and circulate, thereby preventing the exhaust manifold from overheating.
OEM Equipment for the following engine models (and the boat that we are aware used these engines... There could be other combinations as well):
• M-18 (Catalina 27, Catalina 30)
• M-25 (Catalina 30)
• M-25XP (Catalina 28, Catalina 30, Catalina 34, Catalina 36)
• M-25XPB (Catalina 28 MkII, Catalina 30 MkIII, Catalina 310) (QTY 2 water heater plumbing)
• M-35 (Catalina 34, Catalina 36, Catalina 38)
• M-35B (Catalina 34 MkII, Catalina 350, Catalina 36 MkII)(QTY 2 water heater plumbing)
• Inside diameter: 3/8"
• Length: 3-3/4" 300236
Catalina Direct is the largest supplier of Catalina Yacht parts in the country. We specialize in parts, custom up-grades, and accessories. Worldwide delivery available.
