Cylinder Head Valve Head Stand Down - Checking
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
