When cleaning engine gasket sealing surfaces or cleaning parts from one engine that space to be reused, it’s an essential to no use surface ar conditioning discs, such together abrasive pads or bristles. These discs can reason damage to the sealing surface or create debris that will reason damage come bearing surfaces in cast iron and also aluminum engine blocks.

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TIP: Dealerships that usage improper gasket cleaning approaches that an outcome in engine failure will certainly be debited the expense of the replacement and repair.

Abrasives cause Engine Damage

Abrasive pad or bristle devices (Fig. 8) — typically made of woven fiber or molded bristles — should not be used because:

Abrasive pads will develop fine grit the the oil filter will certainly not have the ability to remove from the oil. This grit is abrasive and may cause internal engine damage. Abrasive pads can easily remove enough material to ring cylinder head surfaces, i m sorry can affect the gasket’s ability to seal, especially in the narrow seal areas between the combustion chambers and also coolant jackets.Abrasive pads, wire, and rubber finger wheels have the right to remove sufficient metal to affect cylinder head, block, oil pan rail, and intake manifold runner flatness, i m sorry can cause coolant and oil leaks and air leaks. The takes around 15 seconds to remove 0.203mm (0.008 in.) of steel with an abrasive pad.Abrasive pads, rubber finger wheels and wire wheels v high-speed grinders create air-borne debris that deserve to travel transparent the shop and contaminate other job-related being performed outside of the immediate work area.


Fig. 8

When using surface conditioning discs that contain abrasives, aluminum oxide (a common component the sandpaper) is dislodged indigenous the disc in addition to metal particles from the engine component. Even the finger-type discs, which don’t appear to have actually any kind of abrasive material, contain aluminum oxide. The visibility of aluminum oxide in engine oil has been displayed to cause premature engine bearing failure, in some cases, in as tiny as 1,367 miles (2,200 km) or less after the repair has been made.

Surface conditioning discs additionally may grind the ingredient material and also imbed it into the key when much more aggressive grind of the gasket surface ar takes place.

Any debris indigenous these surface conditioning discs cannot be correctly cleaned indigenous the oil passages through shop waiting or solvents.

Recommended cleaning Procedures

GM recommends the usage of a razor blade or plastic gasket scraper to clean the gasket surface on engine materials that space to it is in reused. Once using a razor blade-type gasket scraper, use a new razor blade because that each cylinder head and also corresponding block surface. Organize the blade as parallel as feasible to the gasket surface ar to ensure the the razor blade does not gouge or scratch the gasket surfaces. Do not gouge or scrape the combustion chamber surface or any type of engine-sealing surface during the cleaning process.

To effectively clean the sealing surface before reassembly, GM low VOC Cleaner, part number 19287401 (in Canada, component number 88901247), have to be pce on the adjustment surface. Avoid acquiring solvent in any type of area other than the mating surface ar to it is in cleaned. Allow it come soak in for several minutes to ease old RTV sealer/gasket material.

TIP: GM recommends making use of a plastic razor tongue or non-metallic scraper to remove all loosened sealer/gasket material.

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When clean engine components, the feel of the sealing surface ar is critical, no the appearance. After all the gasket product is removed, there will be indentations indigenous the gasket left in the cylinder head. The new gasket will fill these tiny indentations when it is installed.