COMPILER TECO/ATL
REG. CODE
1-5302-351
MODEL N°
50563
DATE OF ISSUE
04.90
REVISION 04
ENDORSED
DATE
15.11.99
55
THRUST BEARINGS
Thrust bearings on the FOCS engine are supported by the rear main
bearing cap and the crankcase. The thrust bearing assembly consists
of four(4) separate thrust bearing segments. Two(2) of the segments
are supported by the crankcase and the remaining two(2) are
supported by the rear main bearing cap. All four(4) of the thrust
bearing segments act upon the crankshaft thrust surfaces.
INSPECTION: Thoroughly clean the rear main bearing cap thrust
bearing socket and the crankcase side thrust bearing socket. Inspect
the thrust bearings for indications of high wear, scuffing, scratches
and general condition. Inspect the crankshaft thrust surfaces for
galling, scratches, pitting, etc..
INSTALLATION: Liberally coat the crankcase side thrust bearings
with clean engine oil and install by “rolling” the segments between
the crankcase thrust bearing socket and the crankshaft thrust
surface. The bearings must be installed so that the bearing surface,
as indicated by oil grooves(A) is oriented toward the crankshaft thrust
surface. The main bearing cap thrust bearings are simply placed on
the thrust bearing reliefs and indexed with location “ears” as shown in
the diagram. The thrust bearings must be oriented so that the oil
grooves(A) face the crankshaft thrust surfaces. Liberally coat the
thrust bearings with clean engine oil, then install the rear main
bearing following the instructions presented on page 43. NOTE: The
upper thrust bearings (crankcase side) do not include the locator
“ears” for purposes of locational index.
CRANKSHAFT END PLAY
After installing all main bearings and the thrust bearings, the
crankshaft end play may be measured.
1. Push the crankshaft toward the crankshaft pulley end of the
engine.
2. Using a feeler gage, measure the clearance between the thrust
bearing wear surface and the crankshaft thrust surface.
SPECIFICATIONS:
A = 0.130 / 0.313mm (Wear Limit = 0.5mm)
B = 23.05 / 23.10mm (Wear Limit = 23.50mm)
If the crankshaft end play exceeds the specifications above, fit the
engine with oversize thrust bearing segments and/or grind the
crankshaft thrust surfaces. The following provides guidelines for the
application of oversize bearings and for grinding the crankshaft thrust
surfaces.
THRUST SURFACE SPECIFICATIONS- CRANKSHAFT END PLAY
CORRECTIONS
Depending on the condition/ width of the crankshaft thrust
surfaces(B)(above figure) and the width(C) of of the main bearing
cap thrust bearing socket/ thrust bearing width combination,
crankshaft end play can be corrected in several ways. Std, 0.1mm
oversized and 0.2mm oversized thrust bearings can be fitted on
side(1), side(2) or both. The following table provides details of the
combinations of thrust bearing width, thrust surface width(main
bearing cap / crankcase) and crankshaft thrust surface width.
TABLE KEY:
A = Crankshaft End Play (resultant)
B = Width of crankshaft thrust surface
THRUST BEARING C (mm) B (mm) A (mm)
COMBINATION
Standard 22.787÷22.920 23.050÷23.100 0.130÷0.313
0.1mm (both sides) 22.987÷23.120 23.250÷23.300 0.130÷0.313
0.1mm (one side)
0.2mm (one side) 23.087÷23.220 23.350÷23.400 0.130÷0.313
0.2mm (both sides) 23.187÷23.320 23.450÷23.500 0.130÷0.313
DISASSEMBLY/REASSEMBLY
II
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