Oil Seepage Diagnosis and Repair Procedures – 2012-2013 Subaru Impreza

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NHTSA ID Number: 10186345

Manufacturer Communication Number: 02-130-12R

Summary

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.

 


2013 Subaru Impreza
2013 Subaru Impreza

 


NUMBER: 02-130-12R
DATE: 07/18/12
REVISED: 01/22/21

APPLICABILITY: 2012-2013MY 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 surfaces between either the left or right-hand camshaft cap and camshaft carrier

3. The sealing surface between the upper oil pan and the engine block

4. The sealing surfaces between the cylinder head and camshaft carrier

5. 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.

Bolt:  Part# 800206180

Washer:  Part# 031106000

Tightening Torque:   6.4 +/- 0.5 Nm (57 +/- 4 inch-pounds)

Bolt: Part# 800206180 Washer: Part# 031106000

 

If oil seepage is verified coming from the front camshaft cap or cam carrier as shown in the photos below, remove the cam cap and clean both surfaces thoroughly before applying sealer.  Note: The 2 o-rings between the camshaft cap and the cam carrier will need to be replaced as they are not re-usable.

Oil seepage

Apply Liquid Gasket, ThreeBond 1217H (SOA868V9610eBay) or equivalent* as shown below:

Liquid Gasket, ThreeBond 1280B, (Part No. SOA5499100)

 

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 1217H (SOA868V9610eBay) 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.

oil seepage from the upper pan to engine block sealing area

seepage from upper oil pan to engine block sealing surfaces

 

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 1217H (SOA868V9610eBay) 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 14451AA050eBay.

Cam carrier seepage seen from top left and lower right side of engine

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.

reseal the front chain cover

 

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 1217H (SOA868V9610eBay) or equivalent*.

 

*See Service Bulletin 01-167-08R for recommended and alternative sealing materials.

 

COUNTERMEASURES

VEHICLE INSPECTION AREA COUNTERMEASURE MODEL STARTING VIN# STARTING ENGINE #
Impreza 1 Elimination of 6mm tapped hole in boss of camshaft cap 4-Door C*020238 0266216
5-Door C*224602
2 and 4 Additional sealer added 4-Door C*027623 0345502
5-Door C*238061
3 Additional sealer added 4-Door C*027623 0345489
5-Door C*238061

 


2 Affected Products

Vehicle

MAKE MODEL YEAR
SUBARU IMPREZA 2012-2013

 


1 Associated Document

Manufacturer Communications

NUMBER: 02-130-12R
DATE: 07/18/12
REVISED: 01/22/21

https://www.nhtsa.gov/recalls?nhtsaId=10186345

MC-10186345-0001.pdf 1262.686KB

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