Pontiac Fiero 1988 Service Manual page 298

GENERAL ENGINE MECHANICAL 6A-21
(.010") (V6), or .127 mm (.005") (¥8) must be
removed, replace the block.
• Oil pan rail and timing cover attaching area for
nicks.
M i n o r
irregularities may be cleaned up
with a flat mill file.
• Transmission case mating surface
1-STRAIGHT EDGE
2 - F E E L E R GAGE
G20042-6A
Figure 46 Checking Cylinder Block for Flatness
N O T I C E :
If this surface is not flat, a broken
flexplate may result.
, G20043-6A
Figure 47 Measuring Transmission Mounting Surface
Run Out
• Bearing bores. With a bore gage, measure
concentricity and alignment (Figure 48)
Camshaft
Crankshaft
If outside specification, replace the block.
If an examination of the outside of the
bearing inserts indicates minor high spots,
they may be carefully removed.
• Temporarily install the crankshaft. Measure
crankshaft flange runout (refer to Crankshaft).
Measure
Six mounting hole bosses (Figure 47)
the
the
1. Hold gage plate flat against
crankshaft flange (Figure 47).
2. Place dial indicator stem on
transmission mounting bolt hole boss
(Item 1, Figure 47) and set indicator
to 0.
3. Record the readings obtained on the
remaining transmission mounting bolt
hole bosses. Measurements should not
vary more than .203 mm (.008").
4. If the readings vary more than .203
mm (.008"), recheck crankshaft flange
run out. If the run out is excessive,
replace the crankshaft.
• Threaded holes. If necessary, clean with a tap, or
drill out and install thread inserts (refer to Thread
Insert Repair).
Important
i The following inspections as well as
reconditioning, if necessary, must be carried
out with the main bearing caps installed and
torqued to specification.
• Make sure main bearing caps are installed
correctly, with the arrows pointing toward
the front of the engine.
BORE GAGE
CYLINDER BLOCK
G20044-6A
Figure 48 Measuring Bearing Bore
Cylinder bore, with bore gage J 8087 measure for
wear, taper, runout and ridging (Figure 49)
# If the bore is worn beyond limits (Figure 50), it
may be rebored, honed and fitted with oversize
pistons. The smallest available oversize should be
selected (refer to Piston Fitting).
f f | Important
m Leave sufficient material to allow finish
honing in conjunction with fitting the
piston.