5  Apply clean engine lubricating oil to the rollers, to

the face at the end of the tool and to the counterbore

in the cylinder head.

6  Insert the rolling tool in the valve guide and turn

slowly the rolling tool. Apply enough pressure to

spread the material of the cylinder head over the

chamfer of the valve seat insert. Ensure that the face

at the end of the tool is suitably lubricated before the

face at the end of the tool is in contact with the top

face of the insert (A). When this occurs, the cylinder

head is fully rolled over the insert, and the tool can be

removed.

7  Use the valve seat cutter, 21825 842, and the

relevant pilot, to machine to the correct angle, the

seats which have been renewed. Ensure that the

cutter is  correct for the angle of the valve seat, which

is giv en on page 59. Lap the valves to the seats.

Clean thoroughly the area around the valves and the

seats and use engineer's blue to check that the faces

of the valves are in full contact across and around the

faces of the valve seats.

8  Fit the valves in their relevant seats and use a

straight edge and a feeler gauge to chec k that the

clearances between the heads of the valves and the

flame face are within the limits given on page 59. If a

clearance is excessive, a new valve must be fitted.

The number of the cylinder and the position of the

valve should be etched above the collet groove on the

A

227

valve stem. Valves must not be stamped or marked

with a centre punch, because cracks may occur.

帕金斯3008發動機氣門座圈的維修拆卸安裝與測量方法

To dismantle and to assemble         

Special tools:

Drive handle, 21825 861

Replacer kit for cup plugs, 21825 866

Valve spring compress or, 21825 739

Adaptor, 21825 740

Stirrup, 21825 741

1

To dismantle

Check all cup plugs for signs of coolant leakage.

Plugs that are in doubt can be renewed by use of the

replacer kit, 21825 866, and the drive handle, 21825

861. Apply 'Loctite 575' to new cup plugs before they

are fitted to the cylinder head. If the  /8 BSP plug has

been removed because of leakage, clean the plug,

apply 'Loctite 270' to its threads, fit the plug and

tighten it to a torque of 28 Nm (21 lbf ft).

Put the cylinder head, flame face downward, on a

bench with a soft surfac e and remove the valves by

use of the valve spring compressor, 21825 739, with

adaptors 21825 740 and 21825 741. Use the

procedure which follows:

1  Fit the adaptor, 21825 740, into a suitable bolt hole

for the rocker box.

To assemble

To clean and to inspect

2

2

2        2

Apply engine oil to the valve stems, fit each valve into

its correct guide, according to the marking which is

etched on the stem. Lower carefully the assembly of

the cylinder head on to the bench with the flame face

downward, then fit the lower spring seat, spring and

spring retainer or valve rotator, as relevant, over the

valve stem.

Compress each spring assembly and fit the collets

into the collet grooves in the valve stems. Release,

carefully, the valve spring compressor, check that the

collets remain in their correct location, and then

proceed to the next unit.

the cylinder head                       12-10

Clean all of the components; use a cleaning fluid

which can be diluted with water and refer to Section

10 on page 15 for relevant information. To remove

heavy carbon deposits from most components: soak

them in solutions of 'Maxan' or 'Ardrox 667'.

Caution: Do not use the 'Maxan' or 'Ardrox'

processes on the valve springs or the surface finish

will be damaged.

If cup plugs were removed, before the cylinder head

was cleaned, they must be renewed before the

cylinder head is given a test under pressure. Apply

'Loctite 575' to the new cup plugs and insert them into

their correct locations in the cylinder head. Use the

relevant kit of removal/replacer tools for the cup

plugs.

Make, locally, enough seals to close all of the

openings for coolant and fit them to the cylinder head.

Connect a pipe from a supply of air to the coolant

galleries. Apply air at a pressure of 207 kN/m  (30 lbf/

in ).

Caution: Do NOT exceed 207 kN/m  (30 lbf/in ) as

damage may be caused

Put the cylinder head in a tank of water which is at a

temperature of 60°C (140°F) and inspect for bubbles

from around all the cup plugs and injector sleeves.

Renew plugs or sleeves which are not fully sealed.

Remove the seals from the openings for coolant.

Inspect the flame face for signs of damage. If

necessary, the face may be reconditioned by surface

grinding, in four stages, to a maximum of 0,51 mm

(0.020 in). Information about work done must be

etched on an area of the flame face which is not under

the gasket of the cylinder head.

Caution: When a cylinder head flame face has been

machined, the valve seats must be re-cut to maintain

the correct distance between the valve faces and the

flame face of the cylinder head. See fits and

clearances on page 59.

To correct a valve seat

Special tools:

Valve seat tool, 21825 841

Valve seat cutter, 21825 842

 

It is recommended that all the valve guides are

inspected, and renewed as necessary, before the

work is begun on the valve seat inserts. Ensure that

the bores of the guides are within the limits given at

the end of this sec tion.

1  Inspect the inserts for erosion and cracks. If it is

necessary to correct the ins erts, lightly lap the faces

of the v alve seats and their relevant valves. To correct

the faces of more badly damaged valve seats, use the

valve seat tool, 21825 841, and the cutter, 21825 842,

together with the relevant pilot. To use the tool, fit the

guide (A) and proceed as shown (B). Ensure that the

cutter is correct for the angle of the valve seat, which

is given on on page 59. The surface finish of the valve

seat will be improv ed if a compressed air supply is

used to remove debris during this operation.

Warning!  Ensure that eye protection is used during

the above operation.

Caution: During the correction of a valve seat it is

important to remove only the minimum amount of

material.

2  After the inspection and correction of a valve seat

and the relevant v alve, fit the valve into the guide and

chec k the depth of the head of the valve below the

flame face. If the depth is more than the limits given

on page 59 use a new valve to check again. If the

depth is then within acceptable limits, the new valve

must be fitted to the valve seat when the cylinder

head is assembled.

3  To ensure that the valve is fitted in its correct

position, the number of the cylinder and the position

of the valve must be etched above the collet groove

on the valve stem. Valves must not be stamped or

A

B

222

223

marked with a centre punch, because cracks may

occur.

If the depth still exceeds the acceptable limits, a new

valve seat insert must be fitted.

 

拆卸氣門座

Caution:

Before a valve seat insert for an exhaust

valve can be removed, the edge of the casting of the

cylinder head, which is rolled over the insert, must be

cut away (A). A special cutter, 21825 893, and holder,

21825 892, are available for this purpose.

1  If the relevant valve guide has not been removed,

and its bore is within the acceptable limits, turn the

cylinder head onto its side and slide the expendable

extractor, 21825 896, into the valve guide, until the

head is in contact with the valve seat insert.

2  Weld electrically, at two or three equally spaced

positions around the circumference, the expendable

extractor to the valve seat insert. Make the welds no

larger than is necessary in order to prevent damage

to the cylinder head.

3 Use a soft faced hammer on the end of the stem of

the expendable extractor to remove the old valve seat

insert from its recess (B).

The expendable extractor may be used again if the

welds and the old valve seat insert are removed and

the head is ground lightly to eliminate the protrusions  

3

( / in) diameter to machine two slots into the valve

1

13 mm ( / in) between their c entres. Machine the slot

Another method for removal of a valve seat insert (A1)

is given below:

1  Fasten securely the cylinder head on a milling

machine, and use a slot drill of approximately 10 mm

seat insert (A3). The depth of the slots should be 0,50

mm (0.020 in) less than the depth of the valve seat

insert. The minimum depth of the insert is 7,95 mm

(0.313 in). The slots should be apart by approximately

to within 0,5 mm (0.020 in) of the outside diameter of

the insert.

2  Use a flat chisel, at the point which is indicated by

the arrow (A2) and in the direction of the opening in

the insert, to break the insert. Do not damage the

recess during this operation.

3  Remove the insert and check that the recess is

clean and that there is no damage.

 

Special tools:

Valve seat tool, 21825 841

Valve seat cutter, 21825 842

Drive handle, 21825 861

Tool to insert valve seat, 21825 867

Holder for rolling tool, 21825 892

Rolling tool, 21825 894

1  Valve seat inserts are available in two sizes,

oversize and standard. The oversize inserts are 0,05

mm (0.002 in) larger on the outer diameter. If an

oversize insert is to be fitted, ensure that it has the

correct part number: CV 14128 for an inlet seat or OE

47574 for an exhaust seat. Check also that the wall of

the recess in the c ylinder head will maintain the

correct interference fit, as given on page 59.

2 Cool the valve seat insert in liquid nitrogen to -35°C

(-31°F). Use the special tool, 21825 867, (B1) and the

B

226

handle, 21825 861 (B2), to fit the relevant insert into

its recess as rapidly as possible.

3  Use a 0,04 mm (0.0015 in) feeler gauge to check

that the bottom of the new insert is in full contact with

the bottom of the recess.

If a new valve seat insert has been fitted for an

exhaust valve, the edge of the casting of the cylinder

head must be rolled over the chamfer which is around

the circumference of the insert. Proceed as follows:

4 Fasten securely the cylinder head on a suitable drill

machine with the flame face in the upper position and

fit the rolling tool, 21825 894, and holder, 21825 892,

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