Fleetwood V8-252 4.1L VIN 8 FI (1983)
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If clearance is less than .002", leave the red bearing (P/N 18014329) in the engine.
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If clearance is .002" or greater, install the service #1 main bearing (P/N 18014307), which can be identified by its blue edge
color.
NOTICE:
These two new bearings (P/N 18014329 and 18014307) may only be used in the #1 main bearing bore due to horizontal dimensional
change. If these bearings are installed in the #2 or #4 main bearing bores, crankshaft to bearing interference may result under certain
temperature conditions which may cause severe engine damage.
2.
Main Bearing Update
Bearings #2 through #5 do not significantly contribute to HT4100 engine knock. They have, however, been updated as a result of research on the #1
bearing.
A.
#2 and #4 Main Bearings
P/N 18009086 has been superseded in production by a slightly thicker bearing. The new bearing (P/N 18013442) should be used whenever
replacement of #2 and/or #4 main bearings is required.
B.
#5 Main Bearing
P/N 18009087 has been superseded in production by a slightly thicker bearing. The new bearing (P/N 18013793) should be used whenever
replacement of the #5 main bearings is required.
In addition, service technicians have been provided the ability to reduce operating clearance of the #5 main bearing, if it is suspected as a
source of bearing noise by the release of a new oversize #5 bearing. This bearing (P/N 18012878 - identified by its blue edge marking) should
be installed if the clearance checking procedure described above for the #1 bearing is performed on #5 and the resulting clearance is .002" or
greater. Measurement with a new production bearing must always be performed to make this decision.
C.
Bearing Identification
To eliminate potential confusion resulting from the various part numbers associated with the main bearing revisions, refer to the lastest TSB
number or parts book for latest bearing numbers.
