Valve, Grind - Isuzu C22NE Workshop Manual

6A-46 ENGINE MECHANICAL (C22NE, 22LE, 20LE)

Valve, Grind

Valves can be reused once or twice after regrinding-only if
there are no crater-like burns on the valve cone.
Excessive grinding can cause the upper valve head edge to
become too thin.
Important!
Valve stem protection must not exceed dimension "A"-use 5-
8840-2596-0.
Do not regrind valve stem ends.
For all valve reworking note that angle of valve head is 44° and
the valve seat 45°-see also "Technical Data".
Valve, Grind In
Grind-In the valve to improve valve seating.
Grind-In by rhythmically lifting valves and turning uniformly.
Use commercially available grinding tool.
Important!
Use only fine-grained pastes for grinding.
Lubricate valve stem before grinding in.
Clean
After grinding, carefully clean valve and valve soat.
Valve Guide, Ream
Measure
Diameter of valve guide-dial gauge and internal measuring
instrument.
Important!
Valve oversizes are available ex-works.
Oversize identification, on the valve guide and on the valve
stem end with the following specified identificaton
flgures/letters-see also "Technical Data".
Identification Mark
Size Production Customer Service
Normal none
0.075 mm 1
0.150mm 2
Ream valve guide from the upper side of the cylinder head to
the next oversize (use 5-8840-2599-0).
After reaming, cross out identification mark and stamp in new
identification mark.
Reamer
K
K1
K2