light SKODA OCTAVIA 1997 1.G / (1U) 1.8 92kw Engine Workshop Manual

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15Cylinder Head, Valve Gear
Edition 08.96

Servicing valve gear
Notes:
Cylinder heads with cracks between the
valve seats or between a valve seat ring andthe spark plug thread may continue to be
used without any reduction in life providedthese are slight initial cracks not more than0.3 mm wide or only the first 4 turns of the
spark plug thread are cracked.
After installing new bucket tappets, waitabout 30 minutes before starting the engine (otherwise, valves may strike the pistons);
after this, rotate crankshaft twice.
After working on the valve gear, carefully
crank engine at least 2 revolutions to ensurethat no valve strikes the piston when engine
is started.
1 - 10 Nm

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Edition 08.96



 
Valve depressor MP 1-229
Thrust piece MP 1-229/1
Puller MP 1-230
Fitting tool MP 1-233
Spark plug wrench
Removing
- Remove camshafts page 15-16.
- Remove bucket tappets (do not mix up) and place down with the running surface facing down.
- Use spark plug wrench to remove spark plugs.
- Position piston of the relevant cylinder to „bottom dead centre“.
Exhaust side
- Insert assembly device MP 1-213 and set
bearing to height of stud bolt.
Note:
The rear stud bolts on the exhaust side shouldbe unscrewed in order to install the assembly
device MP 1-213 on the exhaust side.
- Screw pressure hose MP 1-210 into the spark plug thread and apply a constantpressure at least 0.6 MPa
- Use assembly lever and thrust piece MP 1-211 to remove valve springs.
Note:
If valve collets are tight, detach with light blowsfrom a hammer on the assembly lever.
- Use puller MP 1-230 to pull off valve stem
seals.

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15Cylinder Head, Valve Gear



  Edition 08.96

Inlet side
The inlet valves have a different installation
angle in the cylinder head. The valve depressor
MP 1-229 has two different positions:
1 - Top position for centre inlet valve
2 - Bottom position, for the two outer inlet valves
3 - Threaded holes on left and right into whichan M6x25 bolt is inserted which is used for attaching the valve depressor to the cylinder head.
- Attach valve depressor MP 1-229 on the inlet
side to the cylinder head using the two M6x25 bolts.
- Screw pressure hose MP 1-210 into the spark plug thread and apply a constant pressure at least 0.6 MPa
- Set position for the corresponding inlet valve.
- Use threaded spindle and thrust piece MP 1-229/1 to press valve springs down and remove.
Note:
If valve collets are tight, detach with light blowswith a hammer.
- Use puller MP 1-230 to pull off valve stem
seals.

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19Cooling System
Edition 11.96

- Detach bracket -arrow- for refrigerant pipe. Continued for all models
- Remove both headlights: ⇒ Electrical System; Repair Group 94; Re- moving and installing headlights
- Remove the 4 bolts -arrows- for attaching
the top radiator mount.
- Remove the 4 bolts -arrows- for attaching
the bottom radiator mount.

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Edition 11.96


Models with air conditioning
- Pull out radiator slightly together with conden-
ser.
- Detach clip -arrow- for attaching refrigerant
pipe.
Continued for all models
- Remove fan shroud (4 bolts).
Note: When removing and installing the fan shroud,ensure that the radiator ribs are not damaged.
- Carefully take out the radiator downward. Installing Installation is performed in the reverse order; pay attention to the following points:
- Tighten thermostatic switch -1- to
35 Nm.
- Fit on the brackets -2- and -3- at the radiator, as illustrated.
- Tighten the bolts for attaching the fan shroud and radiator mounts to
10 Nm.
- On models with air conditioning, tighten the bolts for attaching condenser and bracketsfor refrigerant pipes to10 Nm.
- Replace O-rings in the connection fittings of the coolant hoses.
- Insert drain plug for coolant.
- Fill system with coolant ⇒ page 19-3.
- Install headlights: ⇒ Electrical System; Repair Group 94; Re- moving and installing headlights
- Electrical connections and routing: ⇒ Current Flow Diagrams, Electrical Fault Finding and Fitting Locations binder

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Edition 08.96



 
Adjusting throttle cable
Notes:
The throttle cable is very sensitive to kinking
and should be treated with particular care
when installing.
A single slight kink can subsequently resultin the cable fracturing when driving. Throttle
cables which have been kinked, musttherefore not be installed.
When installing, ensure that the throttle cableis properly aligned between its supporting
points and the cable attachment points.
Special tools, testers and aids required Spring stretcher rod
Procedure
- Attach throttle cable to the accelerator pedal and to the cam of the throttle valve control unit.
- Pull off locking element for throttle cable at the detent.
- Depress accelerator pedal to full throttle position.
Note:
A second mechanic is required for this step ordepress accelerator pedal using spring stretcher
rod supported against steering wheel.
Models with manual gearbox
- Adjust throttle cable by repositioning the detent on the support bracket so that full throttle position is reached at the throttle
valve lever.
Models with automatic gearbox
- Adjust throttle cable by repositioning the detent on the support bracket so that the throttle valve has opened fully and the kickdown switch is heard to click.
For all models
- Release accelerator pedal or remove stretcher rod.
- After completing adjustment, check idling speed and full throttle stop of the throttle valve.