SA-031-21a

Service Bulletin Details

Public Details for: SA-031-21a

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 assem


- 2021 - 2020 - 2019 - 2018 -

Models from 2021
2021 MAZDA CX-30
2021 MAZDA CX-5
2021 MAZDA MAZDA3
2021 MAZDA MAZDA6
Models from 2020
2020 MAZDA CX-30
2020 MAZDA CX-5
2020 MAZDA MAZDA3
2020 MAZDA MAZDA6
Models from 2019
2019 MAZDA CX-5
2019 MAZDA MAZDA3
2019 MAZDA MAZDA6
Models from 2018
2018 MAZDA CX-5
2018 MAZDA MAZDA6 
BULLETIN NOTES
This service alert supersedes the previously issued service alert listed below. The changes are noted in Red text.
Previous TSBs:
Date(s) Issued:
SA-031/21
05/06/21
SA-058/20
12/21/20, 08/20/20, 08/05/20 and 7/24/20
DUE TO A SUPPLY ISSUE FOR CYLINDER HEADS, GASKET SETS, AND PARTIAL ENGINE, PLEASE CONTACT
HOTLINE FOR REPAIR GUIDANCE.
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.
DUE TO A SUPPLY ISSUE FOR CYLINDER HEADS, GASKET SETS, AND PARTIAL ENGINE, PLEASE CONTACT
HOTLINE FOR REPAIR GUIDANCE.
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
Page 1 of 2
08/05/2021 12:26 PM tlawrenc
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
Page 2 of 2
08/05/2021 12:26 PM tlawrenc

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