11/19/2009
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Cylinder Heads Installation/Removal Caution for Mercedes M112 and M113 Engines
Affects all models with M112 and M113 engines.
Sealing surfaces of the crankcase and cylinder heads are provided with an 0.8 mm thick silicone layer (Loctite 5900) during standard factory assembly. Silicone sealant should be applied during repair assembly only if sink holes exist in the sealing area.
When cleaning sealing surfaces of the factory applied silicone sealant, during cylinder head reassembly, extreme care must be taken in order not to scratch or damage the sealing surfaces.
DO NOT use any gasket removal materials that are abrasive. Failure to follow this procedure could result in severe and permanent engine damage.
Some or all of this information was provided by the Automotive
Parts Remanufacturers Association (APRA). For more information on
technical bulletins available through APRA call 703-968-2772 or visit www.AutoBulletins.com.