Pontiac Fiero 1988 Service Manual page 293

6A-16 GENERAL ENGINE MECHANICAL
« Q
ENGINE LEFT ENGINE FRONT ENGINE RIGHT
1 - OIL RING SPACER GAP
(TANG IN HOLE OR SLOT WITH ARC)
2 - OIL RING RAIL GAPS
3 - 2ND COMPRESSION RING GAP
4 - TOP COMPRESSION RING GAP
G20033-6A
Figure 37 Piston Ring Gap Locations
1 - NOTCH TOWARDS FRONT OF ENGINE
2 - TOOL J-8037
G20034-6A
Figure 38 Installing A Piston Using A Piston Ring
Compressor
| V | Important
m Carefully tap the bearing cap into place. Do
not pull the cap down with the cap bolts or
nuts.
Tighten
• Cap bolts or nuts, then loosen one full turn
and torque to specification.
Inspect
Pry the connecting rod back and forth with a
suitable tool and check for binding. If necessary,
loosen and retighten the bearing cap.
CAMSHAFT AND CAMSHAFT BEARINGS
Camshaft
4-*
Remove or Disconnect
Refer to specific Engine Section
1.
2.
3.
Inspect
Sprocket
Keyway and threads
Bearing surfaces and lobes for:
Wear
Galling
Gouges
Overheating (Discoloration)
Q ] Important
• Do not attempt to repair the camshaft,
replace it if damaged.
© If a new camshaft is installed, all valve
lifters must be replaced (except roller
lifters).
Measure
Cam lobe lift
Lubricate the camshaft bearings with 1051396, or
equivalent.
Carefully insert the camshaft. If the camshaft
bearings are badly worn or damaged, set the
camshaft on "V" blocks instead.
Attach a dial indicator with a ball socket
attachment and measure the cam lobe lift (Figure
39). If any one cam lobe lift is out of specification,
replace the camshaft.
9
O
m
Figure 39 Measuring Cam Lobe Lift
Bearing journals
With a micrometer, measure runout and
diameter. If out of specification, replace the
camshaft.
Important
If a new camshaft has been installed, add GM
1051396 EP lubricant, or equivalent, to the
engine oil.
® Coat cam lobes with 1052367, or equivalent.
Camshaft Bearings
Tool Required:
J 33049 Camshaft
Remover/Installer
Bearing