Main Bearings; Clearance - Honda Prelude 1993 Service Manual

Main Bearings
Clearance
L
T o c h e c k m a i n b e a r i n g - t o - j o u r n a l o i l c l e a r a n c e ,
remove the main caps and bearing halves
L
C l e a n e a c h m a i n i o u r n a l a n d b e a r i n g h a l f w i t h a
clean shop towel.
l.
Place one strip of plastigage across each main jour-
n a l .
NOTE: lf the engine is still in the car when you bolt
the main cap down to check clearance, the weight
of the crankshaft and flywheel will flatten the plastF
gage further than just the torque on the cap bolt.
and give you an incorrect reading. For an accurate
r e a d i n g , s u p p o r t t h e c r a n k w i t h a j a c k u n d e r t h e
c o u n t e r w e i g h t s a n d c h e c k o n l y o n e b e a r , n g a t a
time.
4 . R e i n s t a l l t h e b e a r i n g s a n d c a p s , t h e n t o r q u e t h e
bolts.
75 N.m {7.5 kg-m,54 lb-ft)
NOTE: Do not rotate the crankshaft during inspec-
tron.
5.
Remove the cap and bearings again, and measure
the widest part ot the Plastigage.
Main Bearing-to-Journal Oil Clearance:
Siandard {Newl:
No. 1. 2:
0.021 - 0.0i15 mm
{0.(xn8 - 0.0018 in)
Sqrvice Limit 0.050 mm (0.0020 inl
No. 3
0.025 - 0.0,19 mm
{0.0010 - 0.0019 in}
Service Limii: 0.055 mm 10.0022 inl
No. 4
0.013 - 0.037 mm
10.0005 - 0.d115 in)
Service Limit: 0.050 mm {0.1X120 in)
No. 5
o.(xlg - 0.033 mm
(0.0004 - 0.0013 in)
Servica Limii: 0.040 mm (0.0015 inl
7-8
PLASTIGAGE STRIP
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
bearing. Install a new, complete bearing with the
same color code (select the color as shown on the
next pags), and recheck the clearance.
CAUTION: Do not fi16, 3him, or 3crapo th€ b.arings
or the caps to adiu3t 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 groper clearancs cannot be obtained
by using the appropriate larger or smaller bearings,
reDlace the crankshaft and start over.
7 .