Revised Valve Train Parts to Reduce a Warm Engine Tapping Sound from the Left Cylinder Head – 2013-2014 Subaru Legacy & Outback

NUMBER: 02-150-14R
DATE: 02/07/14
REVISED: 03/3/14

APPLICABILITY: 2013-14MY Legacy & Outback Models with 2.5L FB Engine
SUBJECT: Revised Valve Train Parts to Reduce a Warm Engine Tapping Sound from the Left Cylinder Head



This bulletin announces the availability of revised valve train components developed to reduce a tapping sound (sometimes described as “a sewing machine type” sound) which may be heard coming from the left-hand (B2) side of the engine when the engine is warm.  This bulletin does not address any cold engine or start-up sounds.  The changes consist of:



INTAKE VALVE Part Number 13201AA670 13201AA640
Change Stem Length: Stem Length:
104.95mm 103.3mm
Identification I31 I22
EXHAUST VALVE Part Number 13202AA750 13202AA670
Change Stem Length: Stem Length:
96.5mm 94.1mm
Identification E3 E2
VALVE ROCKER Part Number 13249AA250 13249AA240
Change Change to Roller Portion n/a
Identification Circular groove added on pivot side n/a
INTAKE CAMSHAFT, LEFT Part Number 13037AA960 13037AA850
Change Cam Profile Change n/a
Identification 38B360 or 38B410 38B250 or 38B300
EXHAUST CAMSHAFT , LEFT Part Number 13052AA960 13052AA850
Change Cam Profile Change n/a
Identification 53B360 or 53B410 53B250 or 53B300
PIVOT, ROCKER ARM Part Number 13296AA090 13296AA051
NOTE: These revised rocker pivots were incorporated into production  October 8, 2012, starting with VIN:

Legacy: D*017921   Outback: D*242757

The illustrations below show additional information about the changes to the valve rockers, camshafts and valves to help readily distinguish them from the previous version parts.

Addition of groove



If you receive a customer concern of a tapping sound from the B2 cylinder head, confirm it is isolated to the B2 valve train area before proceeding with any repairs.  Once verified, order and replace the intake and exhaust camshafts, the 4 intake and 4 exhaust valves, and all 8 rockers.  Depending upon the VIN (see part information table) you may also need to replace all 8 rocker pivots.  To clarify, if the VIN is BEFORE VIN D*017921 for Legacy or D*242757 for Outback, you will need to replace the rocker pivots.  Vehicles built after these VINs already incorporate the new pivots.  Refer to the service procedures outlined in the applicable Service Manual for installation.

NOTE:  When setting the valve clearances, the intakes should be set to 0.13mm +0.02 / – 0.03 and the exhausts set to 0.22mm +/- 0.02.  These are revised clearance specifications and are not reflected in the Service Manual.

IMPORTANT:  Do not mix old and new parts together as it will become impossible to obtain intake valve clearances that are within specification.

TIP: An egg carton makes a perfect organizer tray. Make sure to mark it as necessary (front, intake, exhaust) to eliminate any mixing of parts.



For vehicles within the Basic New Car Limited and/or Powertrain Warranty, this repair may be claimed using the following information:



B293-130 AER-48 M/T 3.4
CVT 3.9
 LH CYLINDER HEAD R&R C293-132 All 4.9

HEAD Includes: Valve Seating, R&R of the Springs, Valve Seals & Valve Adjustment

C293-123 1.6

Download (PDF, 414KB)


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Last update on 2019-06-03 / Affiliate links / Images from Amazon Product Advertising API

Last update on 2019-06-03 / Affiliate links / Images from Amazon Product Advertising API

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