ParagrapKs 145-145C
trol rings. Check the pistons and
rings against the values of which
follow:
Ring Groove Width:
Top 0.127 -0.128
Second 0.126 -0.127
Third 0.126 -0.127
Fourth 0.1880-0.1895
Fifth 0.1880-0.1895
Piston Ring Side Clearance:
Top Desired 0.003-0.005
(Maximum 0.007)
Second Desired 0.002-0.004
(Maximum 0.0055)
Third Desired 0.002-0.004
(Maximum 0.0055)
Fourth Desired 0.0015-0.0035
(Maximum 0.005)
Fifth Desired 0.0015-0.0035
(Maximum 0.005)
End Gap, AU Rings 0.009-0.014
Sleeves are of the renewable, wet
type and should be renewed if out of
round exceeds 0.003 and/or taper ex-
ceeds 0.009.
The desired clearance between pis-
ton skirt and sleeve is 0.004-0.005.
The maximum allowable clearance is
0.0095.
Piston to sleeve clearance can be
considered satisfactory when a spring
pull of 2 to 5 lbs. is required to with-
draw a 0.002 thick, i^-inch wide feel-
er gage.
R&R CYLINDER SLEEVES
145.
The wet type cylinder sleeves
can be renewed after removing the
connecting rod and piston units. Refer
to paragraph 144B. Coolant leakage at
bottom of sleeves is prevented by two
rubber "O" rings. The cylinder block
is counter-bored at the top to receive
the sleeve flange and the head gasket
forms the coolant seal at this point.
The sleeves can be removed, using a
special puller; or, the sleeves can be
removed by placing a wood block
against bottom edge of sleeve and tap-
ping the block with a hammer.
Before installing new sleeves, thor-
oughly clean the cylinder block, pay-
ing particular attention to the seal
seating surfaces at bottom and the
counterbore at top. All sleeves should
enter crankcase bores full depth and
should be free to rotate by hand when
tried in bores without "O" rings. Af-
ter making a trial installation without
"O"
rings, remove the sleeves and in-
stall the "O" rings making certain
that the *'O" rings are not twisted. To
facilitate installation of the sleeves
and to keep from cramping or caus-
ing the "O" rings to bulge, coat the
"O"
ring with hydraulic brake fluid
or a thick soap solution. Sleeve stand-
out should be 0.004-0.006 above cylin-
der block after installation.
PISTON PINS
145A. The full floating type 0.99955-
0.99975 diameter piston pins are re-
tained in the piston pin bosses by
snap rings and are available in stand-
ard size only. Check the piston pin
fit against the values which follow:
Piston pin clearance in piston 0.00025T-
0.00045L. Piston pin clearance in rod
bushing 0.00015-0.00085.
CONNECTING RODS AND
BEARINGS
145B.
Connecting rod bearings are of
the renewable, steel-backed, copper-
lead-lined, slip-in type. The bearings
can be renewed after removing oil pan
and bearing caps. When installing new
bearing shells, make certain that the
bearing shell projections engage the
milled slot in connecting rod and bear-
ing cap and that cylinder numbers on
the rod and cap are in register and
face opposite to camshaft side of en-
gine.
Bearing inserts are available
in standard size as well as undersizes
of 0.010, 0.020 and 0.040. Check the
crankshaft crankpins and the bearing
inserts against the values which
follow:
Crankpin diameter
(Standard) 1.9975-1.9985
Rod bearing running
clearance (desired) ...0.0015-0.0035
(Maximum 0.006)
ALLIS-CHALMERS
Rod side play (desired) ..0.002 -^.007
(Maximum 0.013)
Rod bolt torque
(Ft.-Lbs.) 30-40
CRANKSHAFT AND
MAIN BEARINGS
145C.
The crankshaft is supported in
seven steel-backed, copper-lead-lined,
slip-in precision type main bearings.
Main bearings can be renewed after
removing oil pan and main bearing
caps.
Desired crankshaft end play is
0.002-0.007. Miximum allowable end
play is
0.011.
Crankshaft end play is
corrected by renewing the center main
bearing shells.
To remove the crankshaft, first re-
move the engine as outlined in para-
graph 141. Remove clutch, flywheel
and engine rear end plate. Remove
valve cover, rocker arms assembly
and push rods. Remove oil pan, oil
pump, and rod and main bearing caps.
Remove crankcase front cover (tim-
ing gear cover), unbolt camshaft thrust
plate, withdraw camshaft and remove
the engine front end plate. Lift crank-
shaft from engine.
Check crankshaft and main bear-
ings against the values which follow:
Crankpin diameter
(Standard) 1.9975-1.9985
Main journal diameter
(Standard) 2.497 -2.498
Main bearing running
clearance (desired) ...0.0023-0.0045
(Maximum 0.011)
Main bearing bolt torque
(Ft.-Lbs.) 125-135
Three-quarter view of WD45 Diesel engine.
40
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