1975 Datsun 280z FSM - Spooled up Racing

Engine Mechanical
INSPECTION AND REPAIR
CONTENTS
PREPARATION FOR INSPECTION EM- 7
CYLINDER HEAD AND VALVE EM- 7
CHECKING CYLINDER HEAD
MATING FACE EM- 7
VALVE ASSEMBLY EM- 7
VALVE SPRING EM- 8
ROCKER ARM AND VALVE ROCKER
PIVOT EM- 9
VALVE GUIDE EM- 9
VALVE SEAT INSERTS
EM-10
CAMSHAFT AND CAMSHAFT BEARING EM-11
CAMSHAFT BEARING CLEARANCE EM-11
VALVE TIMING
EM-11
CAMSHAFT ALIGNMENT
EM-12
CYLINDER BLOCK
EM-12
HOW TO MEASURE CYLINDER
BORE
EM-13
CYLINDER BORING
EM-13
PISTONS, PISTON PINS AND PISTON
RINGS
EM-15
CONNECTING ROD
EM-16
CRANKSHAFT
EM-16
BUSHING AND BEARING
EM-17
MEASUREMENT OF MAIN BEARING
CLEARANCE
EM-17
MEASUREMENT OF CONNECTING ROD
BEARING CLEARANCE
EM-17
FITTING BEARINGS
EM-18
MISCELLANEOUS COMPONENTS
EM-19
CRANKSHAFT SPROCKET, CAMSHAFT
SPROCKET
EM-19
CHAIN TENSIONER AND CHAIN
GUIDE , .. EM-20
FLYWHEEL
EM-20
FRONT COVER AND REAR OIL SEAI EM-20
PREPARATION FOR
INSPECTION
1. Before cleaning, check for signs
of water or oil leaks in cylinder block
and head.
2. Clean oil and carbon deposits
from all parts. They should be free of
gaskets or sealant.
3. Clean all oil holes with solvent
and dry with compressed air. Make
sure that they are not restricted.
CYLINDER HEAD
AND VALVE
CHECKING CYLINDER
HEAD MATING FACE
1. Make a visual check for cracks
and flaws.
2. Measure the surface of cylinder
head (on cylinder block side) for
warpage. If it is found to be beyond
the limit designated below, regrind the
affected surface with a surface grinder.
EM435
Fig. EM-35 Checking cylinder head
surface
Surface grinding limit
The grinding limit of cylinder head
can be determined from the cylinder
block grinding.
Depth of cylinder head grinding is
"A".
Depth of cylinder block grinding is
"B".
The limit is as follows:
A+B = 0.2 mm (0.0079 in)
VALVE ASSEMBLY
1. Check each intake and exhaust
valve for worn, damaged or deformed
valve caps or stems. Correct or replace
any valve that is faulty.
2. Valve face or valve stem end
surface should be refaced with a valve
grinder.
Note: Never remove camshaft bearings
unless you have a suitable
machine for boring camshaft bearing
in line. If you once remove
camshaft bearings, bearing centers
will come out of alignment; reconditioning
is very difficult without
center borings.
Head surface flatness
Standard
less than 0.05
mm (0.0020 in)
Maximum
0.1 mm
(0.0039 in)
rrj
EM295
Fig. EM-36 Intake and exhaust valve
dimensions
EM-7