Crank Degrees Nine Cylinder Engine; General; Reading Crank Position - Diesel WARTSILA F 240 Manual

Manual
F 240

1. General

2. Reading
crankposition
Ver. 01
BACKGROUND INFORMATION
2C 2C

CRANK DEGREES NINE CYLINDER ENGINE

CRANK DEGREES NINE CYLINDER ENGINE
Crank Degrees off the Flywheel on 9F240 Engines :
The nine cylinder engines have irregular crank angles, i.e. an irregular number of de-
grees between T.D.C.'s on the flywheel. However, 3 successive crank angles always
add up to 120 crank degrees.
The distance per crank degree can be found by measuring the circumferential dis-
tance across the 120 crank degrees mentioned, with the help of a measuring tape.
5
2
9F240 Crank angles in flywheel
-- Number of crank degrees after Top Dead Centre = X
-- Assume the distance across 120 crank degrees is 848 mm (flywheel diameter
810 mm).
-- The distance per crank degree is : 848 / 120 = 7.07mm
It follows that the circumferential distance across crank angle X amounts to X
x 7.07 mm.
1
8
O
38
O
44
O
38
O
38
O
44
O
38
9
9F240 Crank angle diagram
--o--o--o--o--o--
7
O
38
6
O
44
4
O
38
3
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