No gaskets, just form in place goop. There is a TSB on it as well. TSB number S-01_20-32A
Order No.: S-B-01.20/32a
SUBJECT:
All Models with M272 and M273 Engines Cylinder Head Cover Leaks
Field inspections of suspected cylinder head cover oil leaks, have revealed that unnecessary resealing is being performed where the cylinder head cover is not the root cause of the leak.
In cases of customer complaints of oil leakage, it is essential to determine the actual source. A proper remedy should be applied to avoid repeat repairs and unnecessary workshop visits (refer to other publications on the subject).
The new generation of Mercedes-Benz engines have chemical sealers (sometimes referred to as "formed-in-place gaskets") applied to sealing surfaces by robots during the engine assembly process. This engine sealing technique called the RTV (Room Temperature Vulcanizing) uses the silicone rubber compound. This precise and uniform application of silicone at the factory insures proper adhesion and a leak tight connection that very rarely leaks.
During necessary engine resealing repairs, care must be taken in preparing surfaces and applying silicone compound. Do not clean surfaces with any abrasive materials or sharp tools.
Only 1 millimeter (+/- 0.2 mm) thick silicone bead should be applied uniformly to one side of sealing surfaces on a precise pattern (refer to Figure 1 and 2). A small amount of oil should be applied to camshaft bearings. Sealing surfaces must be assembled within 10 minutes of sealant application.
The spec'd sealant is Mercedes - BR00.45-Z-1013-01A (AKA Loctite 5970 or commercial pack as Loctite 598) FYI BMW calls it Part - 83190404517
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May 12, 2025 at 6:57 PM
