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LP Engine G430 (3.0L)
Maintenance
Inspect vacuum lines and fittings
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Visually inspect vacuum lines and fittings for physical
damage such as brittleness, cracks, kinks and
misrouting. Repair/replace as required.
●
Solvent damage may cause vacuum lines to become
soft. Vacuum lines damaged by oil and/or other
solvents may collapse when the engine is running
effectively closing the passage inside the line.
Inspect fuel lines and fittings
●
Visually inspect fuel lines and fittings for physical
damage. Replace as required.
●
Fuel lines must be supported every 24inches.
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Rubber grommets must be used where a fuel line
passes through sheet metal or similar material.
Engine Compression Check
1. Disconnect the primary lead from the distributor.
2. Remove all spark plugs.
3. Block the throttle plate and choke plate (if equipped)
into the wide-open position.
4. Make sure the battery is fully charged.
5. Starting with the compression gauge at zero, crank
the engine through four compression strokes.
6. Make the compression check at each cylinder and
record each reading.
7. If some cylinders have low compression, inject
about one tablespoon (15 ml or about three squirts
from a pump-type oil can) of engine oil into the
combustion chamber through the sparkplug hole.
Recheck compression.
8. Minimum compression recorded in any one cylinder
should not be less than 70% of the highest cylinder,
and no cylinder should read less than 100 psi (690
kPa). For example, if the highest pressure in any
one cylinder is 150 psi (1035 kPa), the lowest
allowable pressure for any other cylinder would be
105 psi (725 kPa), since 150 x 70% = 105 (1035 x
70% = 725).
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Normal condition - compression builds up quickly
and evenly to the compression specified on each
cylinder.
●
Piston rings leaking - low compression on first stroke
tends to build up on following strokes but does not
reach normal. Improves considerably with addition of
oil.
●
Valves leaking - low compression on first stroke.
Does not tend to build up on following strokes. Does
not improve much with addition of oil.
●
If two adjacent cylinders have lower than normal
compression, and injecting oil into cylinders does not
increase the compres-sion, the cause may be a
head gasket leak between the cylinders.
Cooling System
CAUTION
Alcoholor methanol-based antifreeze or plain water
are not recommended for use in the cooling system at
anytime.
G430 Engine recommends that the cooling system be
filled with a 50/50 mixture of ethylene glycol antifreeze
and water.
G430 Engine can use any type of permanent
antifreeze or any brand antifreeze solution that meets
GM Specication 1825M or 1899M which will not
damage aluminum parts. Refer also to Cooling
System Section for additional information.
Checking coolant Level
Do not remove cooling system pressure cap when
engine is hot. Allow engine to cool and then remove
cap slowly allowing pressure to vent. Hot coolant
under pressure may discharge violently.
1. Check coolant level in coolant recover tank. Add
