Engine - Brief Knocking Noise On Cold Engine Start Up
NUMBER: 02-113-11RDATE: 01/26/11
*REVISED: 10-07-11*
APPLICABILITY:
2011 MY Forester 2.5L N/A
SUBJECT:
Noise In Engine on Cold Start
Updated information is noted by asterisks and shading
INTRODUCTION
If you encounter a customer complaint that there is a knock type sound in the engine for about one second on initial start-up after the vehicle has been parked for an extended period of time, there is the possibility the left side timing chain tensioner is causing the sound. If the check ball within the tensioner doesn't seat completely, it may cause the tensioner to leak down, decreasing the amount of pressure to the timing chain guide.
The sound is non-detrimental and has no effect on the reliability and durability of the engine While we do not recommend disassembling the front of the engine for replacement, the sound can be eliminated by exchanging the original left side tensioner with a modified one.
COUNTERMEASURE IN PRODUCTION
A countermeasure was made to better seat the check ball. The *final countermeasure* timing chain tensioner was used in production mid-*May, 2011* starting with engine # *097611*.
PART INFORMATION
NOTE:
Engine Repair Parts Kit, Part # *10130AA150* contains the following parts which are listed as a reference only.
MATERIALS NEEDED
THREE BOND 1280B, Part # SOA5499100 or equivalent
3M(TM) Ultrapro(TM) High Temp Silicone Gasket 08672 Black, 3 oz
REPAIR PROCEDURE/INFORMATION
For disassembly and reassembly, please refer to the applicable Subaru Service Manual found on STIS for detailed instructions When reassembling, make sure to torque bolts to proper specifications
CLAIM INFORMATION
For vehicle within the Warranty period, this repair can be claimed using:
Note:
For claim purposes use Part # S0A635065 for THREE BOND 1280B, which may only be charged once per repair.
Disclaimer