Specification of 95 Horse-Power Gas Engine

The detail specification given in the previous pages applies generally to the 95 H.P. size and upwards although these larger sizes have a few modifications suited to the increased sizes as compared with engines from 10 to 70 H.P.

The modifications to which we refer are as follows :—-

Air and Gas Valve and Cylinder Jacket,—The air and gas valves are contained in a separate water-cooled casting which on removal exposes the whole of the inside of the cylinder jacket, which is thus made easily accessible for cleaning purposes. This is a most important feature in larger engines, as in the majority of cases the water supply contains many impurities either in suspension or solution : these deposit in the cylinder jacket, which becomes silted up, thus rendering the water-cooling onfy partially effective. A hand-hole with removable cover is likewise provided in the cylinder casing for inspection purposes.

Valve-Spindle Guides.—The spindle guides of all main valves, namely, gas, inlet and exhaust valves, are made separate from the main castings, so as to be easity renewable. As the spindles or guides become worn. in the course of years, they can be renewed at small cost without having to replace an expensive casting, as is the case with engines by other makers. The importance of this feature is that leakage of objectionable fumes is entirely preventable in the case of National engines throughout the whole of their life.

Side-Shaft Bearings.—The side-shaft bearings are fitted with automatic ring oilers which insure effective lubrication on a minimum oil consumption.

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