Tabulated Data - TM-9-2815-213-340013

*TM 9-2815-213-34

bearing cap to absorb crankshaft thrust loads. Dowel

block with 16 hold-down capscrews. Injectors and valves

pins are used to position each dowel pin half-ring.

are mounted in the cylinder head. Rocker levers and

(5) Crankshaft gear. A crankshaft gear is keyed to

bearing assemblies are located on top of each head on

pedestals.

the rear end of the crankshaft driving the gear train for

(12)Valves, valve springs, valve rocker levers,

the camshaft and air compressor.

(6) Vibration damper. A vibration damper is

bearings, and fuel injectors.

(a) There are dual intake and exhaust valves

mounted to the forward end of the crankshaft to dampen

for each cylinder. Sixteen valve rocker levers with

crankshaft vibrations. The unit consists of a rubber

bearing assemblies are mounted on the rocker lever

damper hub and inertia member, both of which have

shafts. A cross-head moves two valves in unison from

alinement marks and are matched when assembled. The

pressure excited by the rocker lever. Right and left

unit is further matched with alinement marks when

movement comes from a push tube connected to the

installed on the crankshaft to aid in dynamic balance.

(7) Connecting rod with piston pin bushing. The

cam followers. The cam followers ride on the lobe of the

camshaft. The valves and their companion crossheads

connecting rod assemblies are two piece, I-beam, steel-

operate in replaceable guides. Valve springs are secured

forgings split at the crankshaft end. Two piston pin

to valve stems by valve spring retainers and locks.

bushings are press fit into the rod at the piston end for

Rocker lever shafts are supported by four rocker lever

the floating-type piston pin. The pin is held in the piston

brackets mounted on the cylinder heads.

by two retaining rings.

(8) Connecting

rod bearings. Connecting rod

(b) Eight injector rocker levers and bearing

assemblies are mounted on the rocker arm shaft along

bearings are steel backed, copper-lead, insert type, split

with the valve rocker assemblies. The injector is actuated

on the diameter. They are interchangeable and are

by the same method used to actuate the valve.

installed without reaming, scraping, or use of shims.

(13)Flywheel with Ring Gear Assembly. The flywheel

(9) Pistons. Aluminum alloy pistons are "barrel

with ring gear assembly consists of a cast iron flywheel

ground", which provides a greater diameter at the thrust

with a replaceable steel ring gear. The flywheel is

surface than at the piston pin bosses. Pistons have three

attached to the rear of the crankshaft by means of a

piston rings (two compression and one oil). Compression

crankshaft adapter using eight capscrews. The ring gear

rings are located in the bottom groove. All rings are

meshes with the starter gear during the cranking

located above the piston pin boss.

operation.

(10)Camshaft. A single camshaft positioned in the V-

(14)Oil Pump Assembly. The oil pump installed

section of the cylinder block directly above the

within the oil pan is of the positive placement gear type in

crankshaft, controls all valve and injector operations for

mesh with a gear train. Oil is drawn from the oil pan

both banks. It is supported by five camshaft bushings

sump through the oil pump inlet pipes (both suction and

installed in the cylinder block. A camshaft thrust bearing

scavenger lines) to the pump inlet ports. Oil is pumped

is installed at the gear (rear) end of the camshaft to

from the pressure pump under pressure through the

absorb thrust loads. Drilled oil passages in the cylinder

discharge port into various drillings in the block, cylinder

block lubricate the five camshaft bearings. The camshaft

head, crankshaft, and rocker levers lubricating the

gear is pressed and keyed to the rear of the camshaft

engine. The scavenger evacuates oil from the rear of the

and is meshed (marked "O") with the crankshaft gear.

oil pan and returns it to the main sump when the vehicle

The camshaft is driven at one-half crankshaft speed.

is operating on steep grades. Oil pressure is maintained

The camshaft gear is meshed with the fuel pump and air

by a regulator installed in the oil pressure pump.

compressor drive gear at the upper rear portion of the

engine. The camshaft has twenty-four cams, eight

operate exhaust valves, eight operate intake valves, and

1-5.

Tabulated Data

eight operate fuel injectors.

Refer to TM 9-2320-206-20 for tabulated data pertaining

(11)Cylinder head. Two cylinder heads (one each

to general characteristics and performance of the engine

bank) are attached to the cylinder

assembly.

a. General.

Manufacturer Cummins Engine Company, Inc.

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