Cylinder Head Gasket (Residual Carbon Deposits And Rubber Coating Removal) (02-100-06R)

Publication date: 2006-10-31
Reference number: 02-100-06R
Supersedes refnos: 02-100-06

CYLINDER HEAD GASKET (RESIDUAL CARBON DEPOSITS AND RUBBER COATING REMOVAL)

CYLINDER HEAD GASKET (RESIDUAL CARBON DEPOSITS AND RUBBER COATING REMOVAL)

TECHNICAL SERVICES BULLETIN

Reference Number(s): 02-100-06R, Date of Issue: October 31, 2006

Affected Model(s):	All Models
Supercedes:	02-100-06

INTRODUCTION

The purpose of this bulletin is to provide Subaru's recommended procedure of removing the residual carbon deposits and the rubber coating after the cylinder head/gaskets are removed. If not removed properly, the new cylinder head gaskets may not seat properly when installed. There are two approved methods, using a scraper as illustrated or using 3M(tm) RoloC(tm) Bristle Discs, part # 051131-07528, Size 2 inch, Grade 120, Color White. Subaru does not recommend any other cleaning method.

NOTE: Using any other method which results in damage to the surface of the cylinder heads or block is not a matter for warranty.

REPAIR PROCEDURE/INFORMATION

For demonstration purposes the photos are of a 2.5L SOHC engine, however, the procedure applies to all engine types.

Fig 1: Removed Cylinder Head

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Courtesy of SUBARU OF AMERICA, INC.

Fig 2: Cylinder Block After Head Removal

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Courtesy of SUBARU OF AMERICA, INC.

Fig 3: Accumulated Carbon Deposit On Bore Sealing Portion

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Courtesy of SUBARU OF AMERICA, INC.

Fig 4: Carbon Deposit On Cylinder Block Bore Sealing Portion

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Courtesy of SUBARU OF AMERICA, INC.

Fig 5: Rubber Coating Residue On Coolant Sealing Portion

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Courtesy of SUBARU OF AMERICA, INC.

Fig 6: Rubber Coating Residue On Oil Sealing Portion

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Courtesy of SUBARU OF AMERICA, INC.

Using a gasket scraper, carefully clean any carbon deposits and rubber coating found on the surface of cylinder block and cylinder head.

CAUTION: Keep the scraper as flush as possible to the surface to avoid damage to the mating surface of cylinder block and cylinder head.

Fig 7: Carbon Deposits Being Removed

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Courtesy of SUBARU OF AMERICA, INC.

Fig 8: Rubber Coating Being Removed

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Courtesy of SUBARU OF AMERICA, INC.

Fig 9: Rubber Coating Being Removed

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Courtesy of SUBARU OF AMERICA, INC.

Fig 10: Finished Cleaning (Head)

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Courtesy of SUBARU OF AMERICA, INC.

Fig 11: Finished Cleaning (Block)

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Courtesy of SUBARU OF AMERICA, INC.

NOTE: After removing carbon deposit and rubber coating, clean the surfaces using a rag and cleaning solvent.

Fig 12: After Cleaning Bore Sealing Portion

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Courtesy of SUBARU OF AMERICA, INC.

Fig 13: After Cleaning Coolant Sealing Portion

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Courtesy of SUBARU OF AMERICA, INC.

Fig 14: After Cleaning Oil Sealing Portion

G00439009

Courtesy of SUBARU OF AMERICA, INC.