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2A•20 SOHC engines
50 Valve clearances - checking
and adjustment
See Chapter 1, Section 23.
51 Initial start-up after overhaul
or major repair
1 Make a final check to ensure that everything
has been reconnected to the engine and that no
rags or tools have been left in the engine bay.
2 Check that oil and coolant levels are
correct.
3 Start the engine. This may take a little longer
than usual as fuel is pumped up to the engine.
4 Check that the oil pressure light goes out
when the engine starts.
5 Run the engine at a fast tickover and check
for leaks of oil, fuel and coolant. Also check
power steering and transmission fluid cooler
unions, when applicable. Some smoke and
odd smells may be experienced as assembly
lubricant burns off the exhaust manifold and
other components.
6 Bring the engine to operating temperature.
Check the ignition timing then adjust the idle
speed (if applicable) and mixture.
7 Stop the engine and allow it to cool, then re-
check the oil and coolant levels.
8 If new bearings, pistons etc have been
fitted, the engine should be run in at reduced
speeds and loads for the first 500 miles (800
km) or so. It is beneficial to change the engine
oil and filter after this mileage.
52 Compression test -
description and interpretation
1 When engine performance is down, or if
misfiring occurs which cannot be attributed to
the ignition or fuel system, a compression test
can provide diagnostic clues. If the test is
performed regularly it can give warning of
trouble before any other symptoms become
apparent.
2 The
engine
must
be
temperature, the battery must be fully charged
and the spark plugs must be removed. The
services of an assistant will also be required.
3 Disable the ignition system by dismantling
the coil LT feed. Fit the compression tester to
No 1 spark plug hole. (The type of tester which
screws into the spark plug hole is to be
preferred.)
4 Have the assistant hold the throttle wide
open and crank the engine on the starter.
Record the highest reading obtained on the
compression tester.
5 Repeat the test on the remaining cylinders,
recording the pressure developed in each.
6 Desired
Specifications. If the pressure in any cylinder
is low, introduce a teaspoonful of clean engine
oil into the spark plug hole and repeat the test.
7 If the addition of oil temporarily improves
the compression pressure, this indicates that
bore or piston wear was responsible for the
pressure loss. No improvement suggests that
leaking or burnt valves, or a blown head
gasket, may be to blame.
8 A low reading from two adjacent cylinders is
at
operating
almost certainly due to the head gasket
between them having blown.
9 On completion of the test, refit the spark
plugs and reconnect the coil LT feed.
pressures are
given in the
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