DR ALL-TERRAIN Service Manual download pdf (Page 203)

100

101

ENGINE TOP END 5-21

Camshaft

Camshaft Bearing Wear Inspection

○

The journal wear is measured using plastigage (press

gauge), which is inserted into the clearance to be mea-

sured. The plastigage indicates the clearance by the

amount it is compressed and widened when the parts are

assembled.

•

Cut strips of plastigage to journal width. Place a strip on

each journal parallel to the camshaft with the camshaft

installed in the correct position so that the plastigage will

be compressed between the journal and rocker case.

•

Install the rocker case, tightening the bolts in the correct

sequence to the specified torque (see Rocker Case In-

stallation).

NOTE

○

Do not turn the camshaft when the plastigage is be-

tween the journal and rocker case.

•

Remove the rocker case and measure the plastigage

width [A] to determine the clearance between the journal

and the rocker case. Measure the widest portion of the

plastigage.

Camshaft Bearing Clearance ( 18)

Standard: 0.016 ∼ 0.052 mm (0.0006 ∼ 0.0020 in.)

Service Limit: 0.14 mm (0.0055 in.)

Camshaft Bearing Clearance (

22)

Standard: 0.020 ∼ 0.062 mm (0.0008 ∼ 0.0024 in.)

Service Limit: 0.15 mm (0.0059 in.)

If any clearance exceeds the service limit, measure the

diameter of the camshaft journal.

Camshaft Journal Diameter ( 18)

Standard: 17.966 ∼ 17.984 mm (0.7073 ∼ 0.7080 in.)

Service Limit: 17.94 mm (0.706 in.)

Camshaft Journal Diameter (

22)

Standard: 21.959 ∼ 21.980 mm (0.8645 ∼ 0.8653 in.)

Service Limit: 21.93 mm (0.863 in.)

If the camshaft journal diameter is less than the service

limit, replace the camshaft with a new one and measure

the clearance again.

If the clearance still remains out of the limit, replace the

cylinder head and the rocker case.

CAUTION

The cylinder head and rocker case are machined as

a set, and must be replaced as a set.

1 2 ... 198 199 200 201 202 203 204 205 206 207 208 ... 593 594

Comments to this Manuals

No comments

DR ALL-TERRAIN Service Manual Page 203

Comments to this Manuals

Related products and manuals for Lawnmowers DR ALL-TERRAIN