Camshaft And Tappets; Camshaft - Yanmar 3JH4E Service Manual

5.6 Camshaft and tappets

5.6.1 Camshaft

The camshaft is normalized and the cam and
bearing surfaces are surface hardened and
ground. The cams have a curve that minimized the
repeated shocks on
maximizes valve seat life.
(1) Checking the camshaft side gap
Measure the thrust gap before disassembly.
As the cam gear is shrink-fitted to the cam, be
careful when replacing the thrust bearing.
Camshaft side gap
(2) Measure the cam height, and replace
the cam if it is worn beyond the limit.
Intake
Cam height
Exhaust
the valve seats and
mm
Standard Limit
0.05-0.20 0.35
3JH4E/4JH4E
Standard
38.600-38.800
5. Inspection and servicing of basic engine parts
Camshaft
Thrust metal
Limit
38.350
209
Push rod
Tappet
Camshaft bushing
Camshaft gear
006566-01E
Camshaft gear
Thrust metal
Side clearance
010643-00E
007709-00X
4JH4-TE/4JH4-HTE
Standard
39.800-40.000 39.550
37.800-38.000 37.550
mm
Limit