Main Bearings
Clearance
To check main bearing-to-journal oil clearance,
remove the main caps and bearing halves.
Clean each main journal and bearing half with a
clean shop towel.
Place one strip of plastigage across each main iour-
nal.
NOTE: lf the engine is still in the car when you bolt
the main caD down to check clearance, the weight
of the crankshaft and flywheel will flatten the plasti-
gage further than just the torque on the cap bolt,
and give you an incorrect reading. Fot an accurate
reading, support the crank with a iack under the
counterweights and check only one bearing at a
trme.
Reinstall the bearing caps and cap bridge (818C1
engine only) then torque the bolts.
81881 engine:77 N'm (7.8 kgf'm,56lbl'ft)
818C1 engine:
No. 1,5 cap bolts 73 N'm (7.'l kgt'm,56lbf'ftl
No. 2, 3, 4 cap bolts 6a N'm (6.5 kgf'm, 49 lbf'ftl
NOTE: Do not rotate the crankshaft during inspec-
tron,
Remove the cap bridge (818C1 engine only), caps
and bearings again, and measure the widest part oJ
the plastigage.
Main Bearing-to-Journal Oil Cl€arance:
Standard (Newl:
No. 1, 2, 4, 5: 0.024 - 0.042 mm
10.0009 - 0.0017 inl
Service Limit: 0.050 mm {0.0020 inl
No. 3:0.030 - 0.0,18 mm(0.0012 - 0.0019 inl
Ssrvice Limit: 0.060 mm {0.0024 inl
PLASTIGAGE STNIP
lf the plastigage measures too wide or too narrow,
(remove the engine if it's still in the car), remove the
crankshaft. and remove the upper half of the bear-
ing. Install a new. complete bearing with the same
color code (select the color as shown in the right
column), and recheck the clearance.
CAUTION: Do not file, shim, or scrapo ihe bo.rings
or the caps to adiust clearance.
lf the plastigage shows the clearance is still incor-
rect, try the next larger or smaller bearing (the color
listed above or below that one), and check again.
NOTE: lf the Droper clearance cannot be obtained
by using the appropriate larger or smaller bearings,
reolace the crankshaft and start over.
Selection
CAUTION: lf ths codes are indeciphorable becau3o ot
an lccumulation ol dirt and dust, do not gcrub thgm
with a wirs brush or gcrapsr. Clean them only with 3ol-
vont or doisrggnt.
Crankshaft Bore Code Location
Letters have been stamped on the end of the block as a
code for the size of each of the 5 main journal bores
Use them, and the numbers or bars stamped on the
crank (codes for main journal size), to choose the correct
bearings.
B..ring ld.ntificrtionColor code is
on the edge otthe bearang.Larger crank Dore
Mlin Joumal CodG Locttion3 (Numbors or gaBl
IcD
tr;;lIl
Itr-tl
lE;tl I tlHlt
I Lo.""li L
Smaller Smallermsin bearingjournal (thicker)
-------.r> smaller bearing (thicker)
G'een
Gre€^
GreenBlacr
GreenElackBlue
7-8
