AT THE HEART OF THE ROAD TRANSPORT INDUSTRY.

Call our Sales Team on 0208 912 2120

Latest Improvements in Daimler Oil Engine

14th November 1947
Page 37
Page 37, 14th November 1947 — Latest Improvements in Daimler Oil Engine
Close
Noticed an error?
If you've noticed an error in this article please click here to report it so we can fix it.

Which of the following most accurately describes the problem?

SINCE we dealt with the Daintier 8.6-litre oil engine in our issue dated August 1, a number of important modifications and improvements-has been made, with the object of rendering it even more reliable and increasing its heavy-duty capacity.

One of these alterations is the provision of a new design of piston. It is a Specialloid product, and is formed by hydraulic pressing, which allows heavy and light sections to be adjacent to one another and yet have equal structure and uniform mechanical properties. It eliminates the porosity problems of the ordinary multi-sectioned piston casting.

In manufacture, the light-alloy billet is cut from case bar produced by the continuous-cast process. It is preheated, put in a 1,000-ton press in a specially designed die, and then subjected to heat treatment_ The crown has a simple, circular but off-set combustion space. There are four compression rings and one scraper ring

above the gudgeon pin. Of particular interest is another pressure-type ring in the skirt, fitted during first assembly, but intended to be replaced by a scraper ring at the first overhaul.

Another new feature is the introduction of Brivadium " push-in " liners for the cylinder bores_ These can be detached by hand without using tools.

The top is flanged for location purposes, and the liner is normally extracted when a piston is withdrawn, thus avoiding extensive dismantling.

With an R.A.C. rating of 48.6 h.p., this six-eylindered unit of 4.5-in. bore and 5.5-in. stroke develops WO b.h.p. at its normal road setting. It is particularly compact, the overall length from crankshaft flange to the jaws of the starting dogs being only 46.04 ins.

Recent experiments to reduce induction " roar have bean highly successful, use now being made of a specially designed combined unit of oil-bath, air cleaner and silencer. One of these is provided for csch hank of throe cylinders.

Other features of this interesting unit are the massive crankshaft, machined from a stamping of 55-ton nitrided steel, and the seven main journals, with a total bearing area of 43 sq ins. These, together with the big-end bearings, are "flashed" with lead to a thickness of .0002 in., obviating scoring when a new engine is being run in. All the mains" are of the detachable shell type.

Tags


comments powered by Disqus