BRP Johnson J30TEL4SUA 2007 Service Manual page 142

POWERHEAD
CYLINDER HEAD
Camshaft
Inspect the cam face, the camshaft journals, and
the journal bores for pitting, scratches, wear, or
damage. If any such conditions are found, replace
the camshaft and/or the cylinder head.
Use a micrometer to measure the cam height. If
the measurement exceeds the specification,
replace the camshaft.
Cam Height Specifications
Model Standard
1.4203 – 1.4266 in.
IN
(36.076 – 36.236 mm)
30
1.3886 – 1.3949 in.
EX
(35.271 – 35.431 mm)
2
1
1. Cam
2. Micrometer
IMPORTANT:
30 HP model camshafts have a
dent.
1. Dent on camshaft (DF30 models only)
Use a set of "V" blocks to support the camshaft on
a surface plate. Use a dial gauge to measure the
camshaft runout.
140
The service limit for camshaft runout is 0.004 in.
(0.10 mm). If the measurement exceeds this spec-
ification, replace the camshaft.
1
2
Service Limit
1.4164 in.
(35.976 mm)
1.3847 in.
(35.171 mm)
1. Dial gauge
2. Camshaft
Use a micrometer to measure the outside diame-
ters of the journals in two directions at four places.
001475
1. Camshaft journal
Use a bore gauge to measure the inside diame-
ters of the journal bores in the cylinder head.
1
1
001476
1. Camshaft journal bore
001477
1
001479
001480