Opel Frontera UE. Manual - part 262

 

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Opel Frontera UE. Manual - part 262

 

 

6A–12

ENGINE MECHANICAL (6VD1 3.2L)

Engine Noisy

Abnormal engine noise often consists of various noises
originating in rotating parts, sliding parts and other mov-

ing parts of the engine. It is, therefore, advisable to locate
the source of noise systematically.

Condition

Possible cause

Correction

Noise from crank journals or from
crank bearings
(Faulty crank journals and crank

Oil clearance increased due to worn
crank journals or crank bearings

Replace crank bearings and
crankshaft or regrind crankshaft and
install the undersize bearing

y

j

bearings usually make dull noise that
becomes more evident when
accelerating)

Crankshaft out of round

Replace crank bearings and
crankshaft or regrind crankshaft and
install the undersize bearing

Crank bearing seized

Crank bearing seized. Replace crank
bearings and crankshaft or regrind
crankshaft and install the undersize
bearing

Troubleshooting Procedure
Short out each spark plug in sequence using insulated
spark plug wire removers. Locate cylinder with defective

bearing by listening for abnormal noise that stops when
spark plug is shorted out.

Condition

Possible cause

Correction

Noise from connecting rods or from
connecting rod bearings
(Faulty connecting rods or

Bearing or crankshaft pin worn

Replace connecting rod bearings
and crankshaft or regrind crankshaft
pin and install the undersize bearing

y

g

connecting rod bearings usually
make an abnormal noise slightly
higher than the crank bearing noise,
which becomes more evident when

Crankpin out of round

Replace connecting rod bearings
and crankshaft or regrind crankshaft
pin and install the undersize bearing

which becomes more evident when
engine is accelerated)

Connecting rod bent

Correct or replace

g

)

Connecting rod bearing seized

Replace connecting rod bearings
and crankshaft or regrind crankshaft
pin and install the undersize bearing

Troubleshooting Procedure
Abnormal noise stops when the spark plug on the cylinder
with defective part is shorted out.

Condition

Possible cause

Correction

Piston and cylinder noise
(Faulty piston or cylinder usually

k

bi

d

h

i

l

Piston clearance increased due to
cylinder wear

Replace piston and cylinder body

makes a combined mechanical
thumping noise which increases

Piston seized

Replace piston and cylinder body

g

when engine is suddenly accelerated
but diminishes gradually as the

Piston ring broken

Replace piston and cylinder body

but  diminishes  gradually  as  the
engine warms up)

Piston defective

Replace pistons and others

Troubleshooting Procedure
Short out each spark plug and listen for change in engine
noise.

Condition

Possible cause

Correction

Piston pin noise
(Piston makes noise each time it
goes up and down)

Piston pin or piston pin hole worn

Replace piston, piston pin and
connecting rod assy

6A–13

ENGINE MECHANICAL (6VD1 3.2L)

Troubleshooting Procedure
The slapping sound stops when spark plug on bad cylin-
der is shorted out.

Condition

Possible cause

Correction

Timing belt noise

Timing belt tension is incorrect

Replace pusher or adjust the tension
pulley or replace timing belt

Tensioner bearing defective

Replace

Timing belt defective

Replace

Timing pulley defective

Replace

Timing belt comes in contact with
timing cover

Replace timing belt and timing cover

Valve noise

Valve clearance incorrect

Replace adjusting shim

Valve and valve guide seized

Replace valve and valve guide

Valve spring broken or weakened

Replace

Valve seat off–positioned

Correct

Camshaft worn out

Replace

Crankshaft noise

Crankshaft end play excessive
(noise occurs when clutch is
engaged)

Replace thrust bearing

Engine knocking

Preignition due to use of spark plugs
of inadequate heat range

Install Spark Plugs of adequate heat
range

Carbon deposits in combustion
chambers

Clean

Fuel too low in octane rating

Replace fuel

Wide Open Throttle enrichment
system failure

Refer to Section 6E

Selection of transmission gear
incorrect

Caution operator of incorrect gear
selection

Engine overheating

Refer to “Engine Lacks Power”

Others

Water pump defective

Replace

Drive belt slipping

Replace auto tentioner or drive belt

6A–14

ENGINE MECHANICAL (6VD1 3.2L)

Abnormal Combustion

Condition

Possible cause

Correction

Trouble in fuel system

Fuel pressure control valve defective

Replace

Fuel filter clogged

Replace

Fuel pump clogged

Clean or replace

Fuel tank or fuel pipe clogged

Clean or replace

Fuel injector clogged

Clean or replace

Fuel pump relay defective

Replace

Power supply cable for fuel pump
broken or poor connections

Reconnect, correct or replace

Mass Air flow (MAF) sensor circuit
open or defective

Correct or replace

MAF Sensor defective

Replace

Manifold Absolute Pressure (MAP)
Sensor circuit open or shorted

Correct or replace

MAP Sensor defective

Replace

Engine Coolant Temperature (ECT)
Sensor circuit open or shorted

Correct or replace

ECT Sensor defective

Replace

Throttle Position Sensor (TPS)
adjustment incorrect

Readjust

TPS defective

Replace

TPS connector poor connections

Reconnect

Vehicle Speed Sensor (VSS) cable
poor connections or defective

Correct or replace

VSS loosely fixed

Fix tightly

VSS in wrong contact or defective

Replace

Powertrain  Control Module cable
poor connections or defective

Correct or replace

Trouble in emission control system

Heated Oxygen (O

2

) Sensor circuit

open

Correct or replace

O

2

 Sensor defective

Replace

Signal vacuum hose loosely fitted or
defective

Correct or replace

Exhaust Gas Recirculation (EGR)
Valve circuit open or shorted

Correct or replace

EGR Valve defective

Replace

Engine Coolant Temperature (ECT)
Sensor circuit open or shorted

Correct or replace

Canister Purge Valve circuit open or
shorted

Correct or replace

Canister Purge Valve defective

Replace

ECT Sensor defective

Replace

Positive Crankcase Ventilation
(PCV) valve and hose clogged

Correct or replace

Evaporator system

Refer to Section 6E

Trouble in ignition system

————

Refer to “Engine Lacks Power”

6A–15

ENGINE MECHANICAL (6VD1 3.2L)

Condition

Correction

Possible cause

Trouble in cylinder head parts

Carbon deposits in combustion
chamber

Remove carbon

Carbon deposit on valve, valve seat
and valve guide

Remove carbon

Engine Oil Consumption Excessive

Condition

Possible cause

Correction

Oil leaking

Oil pan drain plug loose

Retighten or replace gasket

Crankcase fixing bolts loosened

Retighten

Oil pan setting bolts loosened

Retighten

Oil pan gasket broken

Replace gasket

Front cover retaining bolts loose or
gasket broken

Retighten or replace gasket

Head cover fixing  bolts loose or
gasket broken

Retighten or replace gasket

Oil cooler adapter cracked

Replace

Oil cooler center bolt loose

Retighten

Oil cooler O–ring broken

Replace

Oil cooler piping loose or  broken

Retighten or replace

Oil filter adapter cracked

Replace

Oil filter attaching bolt loose or rubber
gasket broken

Retighten or replace oil filter

Oil cooler broken

Replace

Crankshaft front or rear oil seal
defective

Replace oil seal

Oil pressure unit loose or broken

Retighten or replace

Blow–by gas hose broken

Replace hose

Positive Crankcase Ventilation Valve
clogged

Clean

Engine/Transmission coupling failed

Replace oil seal

Oil leaking into combustion
chambers due to poor seal in valve

Valve stem oil seal defective

Replace

chambers due to  oor seal in valve
system

Valve stem or valve guide worn

Replace valve and valve guide

Oil leaking into combustion
chambers due to poor seal in cylinder

t

Cylinders and pistons worn
excessively

Replace cylinder body assembly and
pistons

parts

Piston ring gaps incorrectly
positioned

Correct

Piston rings set with wrong side up

Correct

Piston ring sticking

Replace cylinder body assembly and
pistons

Piston ring and ring groove worn

Replace pistons and others

Return ports in oil rings clogged

Clean piston and replace rings

Positive Crankcase Ventilation
System malfunctioning

Positive Crankcase Ventilation Valve
clogged

Clean

 

 

 

 

 

 

 

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