Intake Manifold Cleaning And Inspection; Exhaust Manifolds Cleaning And Inspection; Push Rods Cleaning And Inspection; Cylinder Heads Cleaning And Inspection - Ford VSG-411 Service Manual

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Basic Engine
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CLEANING AND INSPECTION
The cleaning and inspection procedures are for a complete
engine overhaul; therefore, for partial engine overhaul or parts
replacement, follow the pertinent cleaning or inspection
procedure.
INTAKE MANIFOLD
Cleaning
Remove all gasket material from the machined surfaces of the
manifold. Clean the manifold in a suitable solvent and dry it with
compressed air.
Inspection
Inspect the manifold for cracks, damaged gasket surfaces, or
other defects that would make it unfit for further service. Replace
all studs that are stripped or otherwise damaged. Remove all
filings and foreign matter that may have entered the manifold
as a result of repairs.
EXHAUST MANIFOLDS
Cleaning
Remove all gasket material from the manifolds.
Inspection
Inspect the cylinder head joining flanges of the exhaust mani-
fold for evidence of exhaust gas leaks.
Inspect the manifolds for cracks, damaged gasket surfaces, or
other defects that would make them unfit for further service.
VALVE ROCKER ARM AND/OR SHAFT
ASSEMBLY
Cleaning
Clean all the parts thoroughly. Make sure all oil passages are
open.
Make sure the oil passage in the rocker arm is open.
Inspection
On rocker arm shaft assemblies, check the clearance between
each rocker arm and the shaft by checking the ID of the rocker arm
bore and the OD of the shaft. If the clearance between any rocker
arm and the shaft exceeds the wear limit, replace the shaft and/or
the rocker arm. Inspect the shaft and the rocker arm bore for nicks,
scratches, scores or scuffs.
Inspect the pad at the valve end of the rocker arm for indications
of scuffing or abnormal wear. If the pad is grooved, replace the
rocker arm. Do not attempt to true this surface by grinding.
Check the adjusting nut(s) torque. If not within specifications,
replace the nut(s). Check the rocker arm pad and fulcrum seat for
excessive wear, cracks, nicks or burrs.
PUSH RODS
Cleaning
Clean the push rods in a suitable solvent. Blow dry the pushrod
with compressed air.
Inspection
Check the ends of the push rods for nicks, grooves, roughness
or excessive wear.
The push rods can be visually checked for straightness while
they are installed in the engine by rotating them with the valve
closed. They also can be checked with a dial indicator.
If the push rod is visibly bent, it should be replaced.
CYLINDER HEADS
Cleanlng
With the valves installed to protect the valve seats, remove
deposits from the combustion chambers and valve heads with
a scraper and a wire brush. Be careful not to damage the
cylinder head gasket surface. After the valves are removed,
clean the valve guide bores with a valve guide cleaning tool. Use
cleaning solvent to remove dirt, grease and other deposits. Clean
all bolt holes. Remove all deposits from the valves with a fine wire
brush or buffing wheel.
Inspection
Check the cylinder head for cracks and inspect the gasket
surface for burrs and nicks. Replace the head if it is cracked.
The following inspection procedures are for a cylinder head that
is to be completely overhauled. For individual repair operations,
use only the pertinent inspection procedure.
When a cylinder head is removed because of gasket leaks,
check the flatness of the cylinder head gasket surface (Figure 15)
for conformance to specifications. If necessary to refinish the
cylinder head gasket surface, do not plane or grind off more
than 0.010 inch.
I
@@CHECK DIAGONALLY
I
@CHECK ACROSS CENTER A2895 1 C
FIG. 15
Typical Cylinder Head Flatness
Check the valve seat runout with an accurate gauge (Figure 16).
Follow the instructions of the gauge manufacturer. If the runout
exceeds the wear limit, reface the valve and valve seat. Measure
the valve seat width (Figure 10). Reface any valve seat whose
width is not within specifications.
RUNOUT GAUGE
A9624-1 A
FIG. 16 Checking Valve Seat Runout