F510 & F525 – COOLING SYSTEM
Remove heat from engine.
• Intake Screen
• Flywheel Fan
• Engine Covers
• Cooling Fins
Theory of Operation:
The engine is air cooled with air flow provided by a fan (A) that is a part of the flywheel. During operation, the fan draws air in through the intake screen (B). The intake screen rotates and cuts debris into small pieces to help prevent the cooling fins from plugging. The blower housing (C) and cylinder block covers (F) then direct the air flow past the cooling fins (D) of the cylinder block and head. Most of the cooling air flows through passages in the cylinder head (E) directly over the valve area. This increased cooling capacity in the valve area helps to minimize valve sticking and seat wear from overheating. The cooling fins are cast into the engine block and
cylinder head to increase their surface area to allow
more of the heat generated by the engine to be
transferred to the cooling air.
On F510 (S.N. 100204— ) and F525 (S.N. 100393— ), a hole and duct in the blower housing direct cooling air flow over the fuel pump. The engine shroud or crankcase has several holes added to it directly in front of the air cleaner to allow cooling air flow over the carburetor. The cooling air flow decreases fuel temperature in the fuel pump and carburetor to help prevent vapor lock.
It is important that the intake screen remains free from debris for proper air flow. The engine covers should not be removed or altered, as cooling capacity will be reduced. Cylinder block and head cooling fins must remain clean to properly dissipate heat. Debris build-up on the intake screen or fins will affect the volume of air setting to the carburetor.