Fig. 4: Plastigage Placed in Lower Shell-Typical
Courtesy of CHRYSLER LLC
Engine crankshaft bearing clearances can be determined by use of Plastigage or equivalent. The following is the
recommended procedure for the use of Plastigage:
1. Remove oil film from surface to be checked. Plastigage is soluble in oil.
2. Place a piece of Plastigage across the entire width of the bearing shell in the cap approximately 6.35 mm
(1/4 in.) off center and away from the oil holes . (In addition, suspected areas can be checked by placing
the Plastigage in the suspected area). Torque the bearing cap/bed plate bolts of the bearing being checked
to the proper specifications.
3. Remove the bearing cap and compare the width of the flattened Plastigage with the metric scale provided
on the package. Locate the band closest to the same width. This band shows the amount of clearance in
thousandths of a millimeter. Differences in readings between the ends indicate the amount of taper
present. Record all readings taken. Compare the clearance measurements to specifications found in the
engine specifications table. See
Engine - Specifications
.
Plastigage generally is accompanied by two
scales. One scale is in inches, the other is a metric scale.
4. Install the proper crankshaft bearings to achieve the specified bearing clearances.
FORM-IN-PLACE GASKETS AND SEALERS
There are numerous places where form-in-place gaskets are used on the engine. Care must be taken when
applying form-in-place gaskets to assure obtaining the desired results.
Do not use form-in-place gasket
material unless specified.
Bead size, continuity, and location are of great importance. Too thin a bead can
result in leakage while too much can result in spill-over which can break off and obstruct fluid feed lines. A
continuous bead of the proper width is essential to obtain a leak-free gasket.
1 - PLASTIGAGE
NOTE:
Plastigage is available in a variety of clearance ranges. Use the most
appropriate range for the specifications you are checking.
2010 Jeep Wrangler Sport
2010 ENGINE 3.8L - Service Information - Wrangler
viernes, 1 de octubre de 2021 05:18:29 p. m.
Page 11
© 2011 Mitchell Repair Information Company, LLC.
