Pontiac Fiero 1988 Service Manual page 278

GENERAL ENGINE MECHANICAL 6A-1
SECTION 6A
GENERAL ENGINE MECHANICAL
CONTENTS
Cylinder Head 6A-1
Valve, Springs and Rotators 6A-2
Valve Stem Height 6A-5
Valve Spring Installed Height ......................... 6A-5
Oil Pump 6A-6
Sump or Gear Pumps 6A-6
Gerotor Oil Pump 6A-7
Connecting Rod and Main Bearings 6A-9
Crankshaft 6A-12
Pistons, Rings and Connecting Rods .............. 6A-13
Piston Pins - Press Fit and Piston Rings 6A-13
Camshaft and Camshaft Bearings 6A-16
Camshaft 6A-16
Camshaft Bearings 6A-16
Valve Lifters 6A-17
Leak Down Rate Test 6A-20
Cylinder Block 6A-20
Piston Fitting 6A-22
Flexplate Balance 6A-23
Thread Repair 6A-23
CYLINDER H E A D
E H
1.
2.
Important
Before removing the cylinder head(s) from the
engine and before disassembling the valve
mechanism, perform a compression test and
record the results.
During disassembly, be sure that the valve train
components are kept together and identified so
that they can be re-installed in their original
locations and with the same mating surfaces as
when removed.
Disassemble
Valve mechanism (refer to specific engine
section)
Oil gallery and water jacket plugs
m Threaded plugs
• Cup plugs, if damaged or leaking
Obtain a suitable self-threading screw.
Drill a hole in the plug.
Install the self-threading screw.
Pry out plug.
Spark plugs
Inspect
Cylinder head gasket and mating surfaces for
leaks, corrosion and blow-by. If the gasket has
failed, determine the cause:
Improper installation
Loose or warped cylinder head
Missing dowel pins
Clean
Cylinder head bolts (Check specific engine
section to determine if new bolts must be used).
Cylinder head. Remove all varnish, soot and
carbon to the bare metal. DO N O T use a
motorized wire brush on any gasket sealing
surface.
Valve guides (Figure 1)
• Threaded holes
• Remains of sealer from plug holes
VALVE GUIDE
CLEANER
BT-6415
O R
J-8101
G 3 4 3 5 8 - 6 A B G
Figure 1 Cleaning Valve Guide
C A U T I O N : S a f e t y g l a s s e s m u s t b e
w o r n w h e n u s i n g a p o w e r w i r e b r u s h
t o a v o i d i n j u r y t o t h e e y e s .
[ f f i Inspect
1. Cylinder head bolts for damaged threads, or
stretching, and damaged heads caused by
improper use of tools.