Land Rover engine 300 TDi. Manual — part 11
ENGINE
24
OVERHAUL
3. Lightly lubricate the tool with engine oil.
4. Insert pilot into valve guide from combustion
chamber side of cylinder head until shoulder of
pilot contacts guide.
5. Check that collet is fully inserted into valve
guide and expand collet against the guide
using a suitable tommy bar.
6. Assemble the 45
°
cutter, MS621 (exhaust
valves) and 60
°
cutter, MS627 (inlet valves) to
tool LRT-12-501.
7. Position tool LRT-12-501 and appropriate
cutter to valve seat insert to be refaced.
8. Using the Allen key, adjust position of cutter so
that centre of cutter contacts area of seat insert
to be cut.
ENGINE
OVERHAUL
25
9. Cut valve seat insert using light hand pressure.
CAUTION: Remove the minimum amount
of material necessary to obtain correct
valve seat face.
10. Smear Prussian Blue to seating face of a
correctly ground valve.
11. Insert valve into guide and press it firmly,
without rotating on to seat insert, remove valve.
12. Check that an even line of Prussian Blue has
been transferred to centre of valve seat insert,
continue cutting operation as necessary until
this has been achieved.
13. Upon completion, remove all traces of swarf.
Valve seat inserts - renew
1. Remove original valve seat insert taking care
not to damage cylinder head.
2. Thoroughly clean valve seat insert recess.
3. Heat cylinder head to 65
°
C.
WARNING: Take care when handling hot
cylinder head.
4. Place cylinder head on bed of hand press and
using a suitable mandrel, press replacement
seat insert into recess.
5. Allow cylinder head to air cool.
6. Check that seat insert is seated squarely in
recess.
ENGINE
26
OVERHAUL
Lapping-in valves
1. Lap each valve to its seat using grinding paste.
2. Apply Prussian Blue to valve seat insert. Insert
valve into guide and press it firmly, without
rotating on to seat.
3. Remove valve and check that a continuous,
even line of Prussian Blue has been
transferred to valve face, continue lapping-in
valve as necessary.
NOTE: Line does not have to be across
whole width of valve face.
4. Remove all traces of grinding paste on
completion.
5. Check valve head stand down of each valve.
Valve head stand down - checking
1. Insert each valve into its respective guide.
2. Using a straight edge and feeler gauges, check
and record stand down of each valve head.
3. Compare figures obtained with those given
below. If any valve head has a stand down
outside that specified, valve and/or seat insert
must be replaced.
Valve head stand down:
Inlet valve A= 0.81 to 1.09 mm
Exhaust valve B= 0.86 to 1.14 mm
ENGINE
OVERHAUL
27
Valves and springs - refit
1. Lubricate valve stems, guides, spring seats,
valve springs, spring cups and collets with
engine oil.
2. Lubricate new valve stem oil seals with engine
oil and fit to valve guides.
3. Fit spring seat, insert valve into its respective
guide, fit valve spring and spring cup.
4. Compress valve spring using tool LRT-12-034
and fit collets.
5. Remove tool LRT-12-034.
6. Tap spring cup with a soft mallet to ensure that
collets are correctly seated.
7. Repeat above procedures for remaining
valves.
Cylinder head gasket selection
CAUTION: New cylinder head gasket
should be same thickness as the original.
If, however, cylinder head, pistons or
crankshaft have been replaced, it will be
necessary to check piston stand proud in order
to determine the correct thickness of gasket.
1. Position a magnetic base DTI to cylinder block
top face adjacent to number 1 cylinder bore.
2. Position stylus of gauge to cylinder block top
face on edge of number 1 cylinder bore; zero
gauge.
3. Rotate crankshaft in a clockwise direction until
numbers 1 and 4 pistons are at TDC.
4. Position stylus of DTI gauge near edge of
piston crown, measure and record number 1
piston stand proud. Measurement must be
taken at front and rear of piston and highest
protrusion figure recorded.
5. Repeat above procedures for remaining
pistons.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст