SA-031-21c

BULLETIN NOTES
This service alert supersedes the previously issued service alert listed below. The changes are noted in Red text.
Previous SAs:
Date(s) Issued:
SA-031/21
10/15/21, 08/05/21 and 05/06/21
SA-058/20
12/21/20, 08/20/20, 08/05/20 and 7/24/20
Dealers can now utilize the Limited Parts Ordering (LPO) page on eMDCS to order the repair parts for 2.5L (with
cylinder deactivation) and 2.5L turbo cylinder head repairs. There is no longer a need to contact hotline for part
ordering and MASH authorization is not required to order parts or perform this repair. If there are any questions
on part ordering or part status, contact the DAG group for assistance.
APPLICABLE MODEL(S)/VINS
2018-2021 CX-5 2.5 SKYACTIV G with cylinder deactivation only (US spec)
2018-2021 Mazda6 2.5 SKYACTIV G with cylinder deactivation only (US spec)
2019-2021 Mazda3 2.5 SKYACTIV G with cylinder deactivation only (US spec)
2020-2021 CX-30 2.5 SKYACTIV G with cylinder deactivation only (US spec)
Searching Key Words: Cam Journal, Valve Guide, Intake Valve, Exhaust Valve, Valve Spring, Hydraulic Lifter, Coolant
leak, Coolant smell, Warp head, Engine Oil Leak, Oil Smell, Oil leak, Misfire, Low Compression, Excessive Leak Down,
Burnt Valves, Rocker Arm.
DESCRIPTION
A new cylinder head assembly for service parts has been newly established for SKYACTIV-G 2.5 with cylinder
deactivation when replacement is needed. Valves, valve springs, valve spring seats, and cotters (IN/EX) are included in
the new assembly.
Dealers can now utilize the Limited Parts Ordering (LPO) page on eMDCS to order the repair parts for 2.5L (with
cylinder deactivation) and 2.5L turbo cylinder head repairs. There is no longer a need to contact hotline for part
ordering and MASH authorization is not required to order parts or perform this repair. If there are any questions
on part ordering or part status, contact the DAG group for assistance.
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REPAIR PROCEDURE
CAUTION: Inspect the replacement cylinder head for scratches, damage, and proper valve keeper installation before
installing the head. Photograph and contact Hotline if any problems are found.
Several videos have been created to aid with the cylinder head replacement
VIDEO REVIEW IS REQUIRED BEFORE PROCEEDING WITH HEAD REPLACEMENT.
NOTE: Videos are for reference only. Refer to the instructions on MGSS for more detail.
CAUTION: Care should be taken when handling the wire harnesses. Bending or stretching the harnesses could break
the wires and this type of damage is not covered under warranty.
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Timing Chain Replacement
Colored Timing Chain Links
Camshaft Inspection
Cylinder Inspection
Bolt Hole Prep
SHLA Installation
SHLA Installation - Correct vs Incorrect
Fuel Injector Seal Replacement
CAUTION: Remove both heat shields from the exhaust manifold to thoroughly clean the exhaust manifold and shields of
oil and debris.
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