Camshaft, Inspection
Camshafts and valve lifters, inspection
Using a steel ruler, check that valve lifter (1) contact
surfaces facing the camshaft are convex or flat. If the
surface is concave, change the valve lifter.
If
the
valve lifter is worn right across the lifting surface,
the valve lifter must be scrapped. The "depression”
shows that the lifter has not been turning.
On the other hand, a dark line outermost on the valve
lifter shows that the surface is not worn. It is valve lifter
condition that determines whether it is necessary to
check for camshaft wear.
Check that the lifting surfaces on the camshaft and
valve lifters do not have large pitting defects. Pitting
defects can occur for various reasons. The defects are
caused when small pieces of metal loosen from the
hardened surface. Lifters and camshafts with minor
pitting defects may be used. Pitting defects seldom
becomes worse.
Check that the camshaft bearing surfaces and cam
curves are not abnormally worn.
Change the camshaft if major damage or wear is evi-
dent.
NOTICE! When the camshaft is changed, all the valve
lifters must also be changed.
Measuring the camshaft
Cam height A
(inlet and exhaust)
26.5 mm (1.04”)
Cam height B
(for injection pump)
41.8 mm (1.65”)
Cam height C
(for feed pump)
27.0 mm (1.06”)
Change the camshaft if the wear limits have been
exceeded.
21-5 Timing Gears and Shaft
47701798 05-2013 © AB VOLVO PENTA 85
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