Mazda 13B-MSP Technical Information Seite 107

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Powertrain Engines
Crankshaft
The crankshaft is equipped with a key for the installation of the crankshaft timing pulley
and the crankshaft pulley.
The crankshaft timing pulley has a magnetic pulse wheel for the CKP sensor signals.
NOTE: When removing or installing the crankshaft timing pulley care must be taken, since
scratches or impacts can de-magnetize the magnetic pulse wheel.
To ensure optimum bearing clearance of the crankshaft, main bearing shells with
different thickness and hence different tolerance class are fitted in one engine. The
upper main bearing shells are only available in one tolerance class and feature a black
color coding on the edge.
The lower main bearing shells are available in three different tolerance classes (A, B and
C) and feature one of the following color codings on the edge:
Blue (tolerance class A)
Black (tolerance class B)
Green (tolerance class C)
To determine the tolerance class for the lower bearing shell of each main bearing, the
diameter classes of the main bearings and of the main journals have to be verified.
The diameter class of the main bearings can be verified by the engraved letters (A to Z)
on the cylinder block, whereas the first letter is equivalent to the diameter class of main
bearing no.5 (the symbol ^ locates the timing belt side).
The diameter class of the main journals can be verified by the printed letters (A to Z) on
the crankshaft, whereas the first letter is equivalent to the diameter class of main journal
no.5 (the symbol ^ locates the timing belt side).
Curriculum Training 01-97
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