engine SKODA OCTAVIA 1997 1.G / (1U) 1.8 92kw Engine Manual Online

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Edition 08.96


Valve dimensions

Dimensions for inlet and exhaust valves
Note:
Inlet and exhaust valves must not be reworked.It is only permissible to grind them in.
Dimension Inlet valve Exhaust valve
a mm 26.80 ... 27.00 29.80 ... 30.00
b mm 5.95 ... 5.97 5.94... 5.95
c mm 104.84...105.34 103.64...104.14 °45 45
Instruction for scrapping exhaust valves
Important! Worn exhaust valves filled with sodium must notsimply be disposed of as normal scrap.
The valves have to be sawn into two parts with ahacksaw between the centre of the stem and the
valve disc. They must not come into contact withwater when carrying out this step. Once the valves
have been cut in this way, place not more than teninto a bucket filled with water. Then, stand back as a sudden chemical reaction takes place in which
the sodium in the valves combusts.
Valves which have been treated in this way canthen be disposed of with normal scrap.
Inspecting hydraulic bucket tappets
Notes:
Always replace bucket tappets complete(cannot be adjusted or repaired).
Irregular valve noises during starting are
normal.
After installing new bucket tappets, wait
about 30 minutes before starting the engine(otherwise, valves may strike the pistons);
after this, rotate crankshaft twice.
After carrying out work on the valve gear,carefully crank engine at least 2 revolutions
to ensure that no valve strikes a piston whenthe engine is started.

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Downloaded from www.Manualslib.com manuals search engine Cylinder Head, Valve Gear15
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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