11. Remove the main bearings with the bushings.
12. Measure the "plastigauge" thickness at its
maximum point.
If clearance does not comply with the specification
values, measure the diameter of the main journal
area and select the bushings, or replace the crank-
shaft.
13. Remove the "plastigauge" from the main jour-
nals.
Characteristic
Clearance
0.024 ÷ 0.042 mm
Main bushing category selection.
1. Read the references to recognise the category
of cylinder block main bearings.
N.B.
- REPLACE THE MAIN BUSHINGS AFTER ALL THE IN-
SPECTIONS HAVE BEEN CARRIED OUT.
- TO SELECT THE MAIN BUSHINGS AFTER REPLACING
THE CRANKSHAFT, REFER TO, "CRANKSHAFT RE-
PLACEMENT".
- THERE ARE FOUR TYPES , IDENTIFIED BY NUMBERS 5,
6, 7 AND 8.
- REFERENCES ARE AS INDICATED IN THE FIGURE.
2. Measure the crankshaft main journals. The measurement must be carried out on 4 points distanced
90° one from the other, for each crankshaft pin, at the points shown in the figure.
The maximum value is considered to be the measurement of the main journal.
Nevertheless, if the variation among the diameters measured on the pin exceeds 0.026 mm, replace
the crankshaft.
The values indicated in the figure are in millimetres.
Engine PORTER 1.3 16V
EN - 318
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