RAM 2500 Truck 4WD V8-5.9L VIN Z LDC (1998)
Bore runout example:
0.000 - (-0.007) = 0.007 inch
+0.002 - (-0.010) = 0.012 inch
+0.004 - (-0.005) = 0.009 inch
-0.001 - (+0.001) = -0.002 inch (= 0.002 inch)
In the above example, the largest difference is 0.012 inch and is called the Total Indicator Reading (TIR). This means that the housing bore is
offset from the crankshaft centerline by 0.006 inch (which is 1/2 of 0.012 inch).
On gas engines, the acceptable maximum TIR for housing bore runout is 0.010 inch. If measured TIR is more than 0.010 inch (as in the example),
bore runout will have to be corrected with offset dowels. Offset dowels are available in 0.007, 0.014 and 0.021 inch sizes for this purpose. Refer to
Correcting Housing Bore Runout for dowel installation.
On diesel engines, the acceptable maximum TIR for housing bore runout is 0.015 inch. However, unlike gas engines, offset dowels are not
available to correct runout on diesel engines. If bore runout exceeds the stated maximum on a diesel engine, it may be necessary to replace either
the clutch housing, or transmission adapter plate.
Correcting Clutch Housing Bore Runout- Engine Only
On gas engine vehicles, clutch housing bore runout can be corrected with offset dowels.
The dial indicator reads positive when the plunger moves inward (toward indicator) and negative when it moves outward (away from indicator). As a
result, the lowest or most negative reading determines the direction of housing bore offset (runout).
Housing Bore Alignment Dowel Selection
In the sample readings shown and in Step 7 above, the bore is offset toward the 0.010 inch reading. To correct this, remove the housing and original
dowels. Then install the new offset dowels in the direction needed to center the bore with the crankshaft centerline.
In the example, TIR was 0.012 inch. The dowels needed for correction would have an offset of 0.007 inch.
Install the dowels with the slotted side facing out so they can be turned with a screwdriver. Then install the housing, remount the dial indicator and
check bore runout again. Rotate the dowels until the TIR is less than 0.010 inch if necessary.
If a TIR of 0.053 inch, or greater is encountered, it will be necessary to replace the clutch housing.
Measuring Clutch Housing Face Runout
