Pontiac Fiero 1988 Service Manual page 287

6A-10 GENERAL ENGINE MECHANICAL
3. Coat bearing surfaces of new, correct size, main
bearings with oil and install in the cylinder block
and main bearing caps.
4. Install the crankshaft.
W i t h o u t C r a n k s h a f t Removal
1.
Figure 22 Inner Gear Tip Clearance-Gerotor
4.
5.
6.
Figure 23 Outer Gear Diameter Clearance-Gerotor
GEAR END CLEARANCE
G20022-6A
Figure 24 Gear End Clearance (Gear Drop In Housing)
-Gerotor
crankshaft procedure in this section and the specific
engine section. Evaluate bearings as specified in this
section. If the engine is out of the vehicle and upside
down, the crankshaft will rest on the upper bearings
and the total clearance can be measured between the
lower bearing and journal. If the engine is to remain in
the vehicle, the crankshaft must be supported upward
to remove any clearance from the upper bearing. The
total clearance can then be measured between the lower
bearing and journal.
W i t h C r a n k s h a f t R e m o v a l
1. Remove and inspect the crankshaft.
2. Remove the main bearings from the cylinder
block and main bearing caps.
1
With oil pan, oil pump and spark plugs removed,
remove cap on main bearing requiring
replacement and remove bearing from cap.
Install a main bearing moving and installing tool
in oil hole in crankshaft journal. If such a tool is
not available, a cotter pin may be bent as required
to do the job.
Rotate the crankshaft clockwise, as viewed from
the front of engine. This will roll upper bearing
out of block.
Oil new selected size upper bearing and insert
plain (unnotched) end between crankshaft and
indented or notched side of block. Rotate the
bearing into place and remove tool from oil hole
in crankshaft journal.
Oil new lower bearing and install in bearing cap.
Install main bearing cap with arrows pointing
toward front of engine.
Torque all main bearing caps, EXCEPT THE
REAR MAIN CAP, to specifications. Torque
rear main bearing cap to 10-12 lb. ft. (14-16 N*m)
then pry end of crankshaft, first rearward then
forward with a screwdriver or prybar. This will
line up rear main bearing and crankshaft thrust
surfaces. Retorque all main bearing caps to
specifications.
AMOUNT
UNDERSIZE
STAMPED AT
THIS END
(.0005, etc.)
OR ON TANG
WITH A
LETTER
STAMP,
A = .0005,
B = .0010,
C = .0015.
G34162-6A-BG
Figure 25 Bearing Insert Markings
Inspect
Bearing surfaces for:
Wear
Gouges
Imbedded foreign material. If foreign
material is found, determine its nature and
source. Inspect oil pan sludge and residue.
2. Outer surfaces for:
Wear. Surface wear indicates either
movement of the insert or high spots in the
surrounding material (spot wear).
Overheating (discoloration)