Perkins 1300 EDi Series, Workshop Manual, Page: 114 / 264

6
102 Workshop Manual, TPD 1353E, Issue 3
Peregrine EDi and 1300 Series EDi
CMS verification of clearance
To check the air gap Operation 6-12
1 Remove the CMS sensor, see Operation 6-11.
2 Clean the CMS mounting surface on the timing cover.
3 Using a calibrated depth gauge device, measure the distance from the CMS mounting surface to a tooth on
the timing disc and note the reading.
Note: When taking this measurement, ensure that the depth gauge device is measuring to a tooth of the timing
disc and not the window between the teeth, this applies also to steps 4, 5, and 6.
4 Rotate the crankshaft
1
/
2
turn clockwise and repeat step 3, note the reading.
5 Rotate the crankshaft a further
1
/
2
turn clockwise and repeat step 3, note the reading.
6 Rotate the crankshaft a further
1
/
2
turn clockwise and repeat step 3, note the reading.
7 Add the measurements from steps 3, 4, 5, and 6.
8 Divide the total by 4 to obtain an average reading.
9 Measure the CMS sensor length from its tip to the mounting flange surface.
10 Subtract the dimension at step 9 from the average dimension at step 8. This is the CMS ‘air gap’.
11 The desired air gap is given in the relevant Data and dimensions for the "Camshaft" on page 15.
12 Subtract step 11 from the result of step 10, this is the air gap / interference.
Note: Extra shims are available in a kit that contains four shims, two of 0,127 mm (0.005 in) thickness, and
two of 0,254 mm (0.010 in) thickness.
13 Select one or more shims to get as near as possible to the air gap measurement in step 11.
14 Fit the shims to the ‘CMS’ sensor and then fit the sensor, see Operation 6-11.
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