Perkins L4 Workshop Manual - L-36 Fleet
Perkins L4 Workshop Manual - L-36 Fleet
Perkins L4 Workshop Manual - L-36 Fleet
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<strong>Perkins</strong> <strong>L4</strong> Diesel engines are vertical four-stroke<br />
Power Units. They are entirely of British design<br />
and manufacture and embody the results of<br />
experience gained in the production of Diesel<br />
engines over a period of many years.<br />
The materials and workmanship throughout are<br />
of the highest class. Most parts are guaranteed<br />
interchangeable, jigs being used everywhere in the<br />
course of manufacture, and all parts pass through<br />
a system of thorough inspection where they are<br />
checked to the closest limits. Each engine is<br />
subjected to stringent tests before leaving the<br />
Works.<br />
General.<br />
The <strong>Perkins</strong> lA Diesel, with which tbis man ua I<br />
is concerned, is a Cour cylinder unit. having a<br />
bore and stroke of 4* in. (107.95 mm) and 4i In.<br />
(120.65 mm) respectively.<br />
Cylinder Block.<br />
The cylinder block and crankcase comprise a<br />
one-piece high duty alloy iron casting. Centrifugal<br />
cast iron wet liners are fitted, which are<br />
flanged at the top end and fitted with sealing rings<br />
at the lower end.<br />
Cylinder Head.<br />
The cylinder head is an alloy iron casting,<br />
secured to the cylinder block by a large number<br />
of weU spaced through studs. The overhead<br />
valves are operated by push rods from flat faced<br />
tappets in the cylinder block, the rocker assembly<br />
being mounted on top of the cylinder head. The<br />
whole assembly is enclosed in a light alloy die cast<br />
cover. All valves are of special alloy steel, the<br />
inlet being larger to ensure maximum volumetric<br />
efficiency. The spherical combustion chamber is<br />
formed half in the head and half by a detachable<br />
steel cap.<br />
Camshaft.<br />
The low level camshaft is situated in the offside<br />
of the cylinder block and is supported by three<br />
hearings.<br />
Page Al<br />
Crankshaft and Main Bearings.<br />
The crankshaft is made from an alloy steel<br />
stam ping, with hardened main and crankpin<br />
journais. The crankshaft runs in three pre-finished<br />
replaceable shell hearings, which are lead bron ze<br />
lined and indium flashed.<br />
Connecting Rods.<br />
The connecting rods are of alloy steel ., H "<br />
section stampings with replaceable steel shell big<br />
end bearings, which are lead bronze lined and<br />
indium flashed.<br />
Pistons.<br />
The pistons are flat topped. They are of light<br />
aluminium alloy with ample metal in the crown to<br />
carry off the heat of combustion. Three com.<br />
pression rings of which ODe is of laminated steel,<br />
and ODe scraper ring are fitted above the gudgeon<br />
pin. There is ODe scraper ring below that pin.<br />
The gudgeon pins are of the fully floating type.<br />
Timing Drive.<br />
The camshaft and fuel pump are gear driven,<br />
the timing case being a separate casting secured<br />
to the front end of the cylinder block. Provision<br />
is made for mounting a gear drive on the timing<br />
case meshing with the timing gear train, for driving<br />
a hydraulic pump or uther low power auxiliary.<br />
Lubrication. l<br />
Lubrication is high pressure force reed thrOUghout<br />
the engine. The pump, a gear type, is secured<br />
to the cylinder block and is driven by spiral gears<br />
from the camshaft. It is fully capable of maintaining<br />
an adequate pressure at all running speeds.<br />
FoeI Injection Equipment.<br />
The unit type fuel pump is fiange mounted<br />
on the timing case.<br />
The atomisers are two hole type fitted in an<br />
accessible position on top of the cylinder head ;<br />
ODe spray is directed into the combustion chamber<br />
and the other into the cylinder, ensuring easy<br />
starting.