Checking The Timing Chain Tensioner - Yamaha F225A Service Manual

POWR
Cam lobe a:
Intake:
45.30–45.40 mm
(1.7835–1.7874 in)
Exhaust:
45.35–45.45 mm
(1.7854–1.7894 in)
Cam lobe b:
Intake:
35.95–36.05 mm
(1.4154–1.4193 in)
Exhaust:
35.95–36.05 mm
(1.4154–1.4193 in)
3. Measure the camshaft runout. Replace if
out of specification.
Crank stand alignment:
90890-03107
Camshaft runout limit:
0.1 mm (0.004 in)
5-39
Power unit
4. Measure the camshaft journal diameter
c and cylinder head journal inside diam-
eter d. Replace the camshaft and cylin-
der head if out of specification.
Camshaft journal diameter c:
24.96–24.98 mm
(0.9827–0.9834 in)
Camshaft cap inside diameter d:
25.00–25.02 mm
(0.9843–0.9850 in)
5. Calculate the camshaft oil clearance e
as follows. Replace the camshaft and
cylinder head as a set if out of specifica-
tion.
Camshaft oil clearance e =
Camshaft cap inside diameter d –
Camshaft journal diameter c:
0.02–0.06 mm (0.0008–0.0023 in)

Checking the timing chain tensioner

1. Measure the plunger extended length a.
Replace if out of specification.
NOTE:
Check the timing chain tensioner every 400
hours of operation.
S69J5970
69J3D11