Allis-Chalmers Model G Wartungshandbuch PDF herunterladen (Seite 23)

driven from the cylinder block.is necessary. ~

Always use a suitable driver.

The valve face and seat angles are 450• The

seat width should be approximately 3/64" and..

not over 1/16". The intake valve stem clear-

ance is ~0018"and should be replaced

if the

combined clearance between the stem and

guide exceeds ~005"• The·exhaust valve stem

clearance in the guide is .0035" and the maxi-

mum allowable clearance is .007" between

the stem and the guide. Replace that part

which is worn most or both,

if necessary.

Ins~ction

Service guides are reamed and ready for use

and are all the same size. The difference in

clearance between intake and exhaust valves

is taken care of on the valve stem. A 5/16"

diameter pilot.is required for checking the

guides. These pilots may be secUred in.OOl"

.002", .003" oversizes. The valve spring is

cadmiumplated and 1-13/16" long. The spring

should be replaced if it is less than 1-3/4"

long.

Install vaA~e spring with closed end or 3

closed COlIs end towards cylinder block.

Assemblx~

in order. ·to.pre_v~ntdistortion of the guide

.. -bore ·while··ariVi:iig~in place. If the guide bore

.' .', is collapsedrit;wilLbe necessary. to.rearn.,._ .•...,."':,'

the ~~_~ZJ~te"r...:;,t~~..guides are in pl~,~"':l;>~.;.: •

a 45 cutt~r.!to·~eseat the. valve seat~·,·,Us~,

·~:~~~I~'~!t:~f;1i;a1${l~!

grmding':(:.ompo,und.. yalve clearance ls'set{''';

to .012'~.WiWpi'eengine cold. Exhaw;i valves; .

with :;t"oto:~cj(ps are;set-.Ol 2""With:engine.~old.·::··

Thesevalves:'inust be.:f.ree to rotate. The'

clearance,'1>~~een cap ~dstemis .004" to

.006".

':C( .. . . -

...-..... I.",~~.-· ::.'~~~. ;.;:

To set the tappets it is necessary to have a

The valve guide is 1-21/32" long and should thin jawed 7/8" tappet wrench that will work

be driven into the cylinder block until it is between the adjacent tappets without inter-

exactly 25/32" from the top face of the block ference, also thin tappet wrenches in 9/16"

to the top of the guide. Use a special driver and 3/4" sizes.

CONNECTING RODS. PISTONS

& RINGS

Removal

Drain and remove the oil sump. Remove the

connecting rod caps and lift the rods from

the crankshaft. Remove the connecting rod

and piston assembly from the bottom of the

eng~e opposite the camshaft side. The

piston pin is a full floating type and may be

removed after the retaining snap rings are

removed, if it is desired to separate the

pistons from the connecting rods.

Inspection

The piston for 'the Model "G" is finished to

a true radius. However, it does have a

tapered relief over the end of the piston pin

bosses. This relief varies from .002" to

.007" deep, tapering out approximately 1/2"

above the lower skirt end and 450 at each

side of the pin center line. This appears as

a discolored triangular shape after the en-

gine has been in use a short time.

The skirt diameter is 2.375" approximately.

The skirt diameter and piston weight will be

G - 22

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 44 45

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