Engine - Oil Seepage Diagnostics And Repair Information
NUMBER: 02-130-12RDATE: 07/18/12
REVISED: 10/02/12
APPLICABILITY:
2012MY Impreza with FB Engine
SUBJECT:
Oil Seepage Diagnosis and Repair Procedures
INTRODUCTION
The purpose of this Bulletin is to provide procedures for the diagnosis and repair of oil seepage which may be coming from the front camshaft cap, upper oil pan and /or the timing chain cover.
There are three areas that should be closely inspected if an oil leak is reported by the customer:
1. The 6mm tapped hole casting boss area in the left-hand camshaft cap
2. The sealing surface between the upper oil pan and the engine block
3. The sealing surfaces between the cylinder head and camshaft carrier
4. The sealing surfaces of the front timing timing chain cover
Note:
Refer to the April 2011 issue of TIPS for more information on Fluid Leak Detection.
If oil seepage is verified coming from the 6mm threaded hole in the left-hand camshaft cap, install the specified bolt and flat washer.
If you find engine oil seepage between the cylinder block and upper oil pan, remove the upper oil pan, clean the machined sealing surfaces thoroughly and then re-seal using Liquid Gasket ThreeBond 1280B, (Part No. SOA5499100) or equivalent*. Note: The o-rings between the upper oil pan and the cylinder block along with those between the upper and lower oil pan will need to be replaced as they are not re-usable.
If you find engine oil seepage between the cylinder block and upper oil pan, remove the upper oil pan, clean the machined sealing surfaces thoroughly and then re-seal using Liquid Gasket ThreeBond 1280B, (Part No. SOA5499100) or equivalent*. Note: The o-rings between the upper oil pan and the cylinder block along with those between the upper and lower oil pan will need to be replaced as they are not re-usable.
If oil seepage is verified coming from between the cam carrier and the cylinder head as shown in the photos below, remove the cam carrier. Clean the machined sealing surfaces thoroughly and then re-seal using Liquid Gasket ThreeBond 1280B, (Part No. SOA5499100) or equivalent*. As shown in the photos below, the o-rings between the cam carrier and the cylinder head will need to be replaced as they are not re-usable. This would also be a good time to clean the Active Valve Control System (AVCS) filter screens which are contained in the cam carriers. NOTE: The filter screens are one-time use and must be replaced if they need to be removed. The replacement filter part# is 14451AA050.
Front Timing Chain Cover resealing procedures:
Note:
Only reseal the front chain cover AFTER confirming there is no oil seepage coming from the cam retainer cap (area 1) as previously described.
1. If there are no oil droplets found on the engine under-cover or the lower radiator hose, thoroughly clean the chain cover sealing area along with the surrounding cylinder head and crankcase areas. Re-check for oil seepage again at the next service interval.
2. If the front chain cover is leaking and needs to be resealed, follow the repair procedure in the applicable Service Manual. Thoroughly clean and inspect the sealing surfaces then re-seal using Liquid Gasket ThreeBond 1280B, (Part No. SOA5499100) or equivalent*.
*See Service Bulletin 01-167-08 for recommended and alternative sealing materials.
COUNTERMEASURES
WARRANTY/CLAIM INFORMATION
For vehicles within the Basic New Car Limited Warranty period, refer to the Subaru Warranty Wizard� for claim submission information. Use the chart below for the 6mm bolt installation procedure outlined in this bulletin.
Disclaimer