Sling 4 TSi
Section 7
Pilot Operating Handbook
Aircraft and Systems
Document Number: DC-POH-001-X-F-3.0
Page | 7-24
Revision: 3.0
Date: 2021/07/14
7.13
Cooling System
Cylinders are air-cooled, though forced are circulation from the inlets
on the nose of the cowl, over cooling fins on the barrels.
Cylinder heads are liquid cooled via a closed-circuit system, with an
expansion tank. The pump is driven from the camshaft and circulates
the coolant in the loop (cylinder heads / radiator).
The expansion tank is closed by a pressure cap. When the coolant
temperature rises, there is a pressure increase and coolant is forced
into the overflow bottle, mounted on the firewall. When the coolant
cools down, the coolant in the overflow bottle is drawn back into the
expansion tank.
Conventional ethylene glycol coolant and distilled water mixture (1:1).
Please refer to the latest edition of the engine manufacturers
operators and maintenance manual.
The coolant volume is approximately 1.5 litres (0.40 US Gal.)
WARNING
Waterless coolant
(propylene-glycol)
may not be mixed with
conventional
(ethylene-glycol/water)
coolant or additives. Mixture can
lead to damage of the cooling system and subsequently the engine.
