Headbolt TSB PDF

A service bulletin that addresses issues with the M156 engine in certain Mercedes-Benz vehicles. The document outlines complaints such as check engine light (CEL) and low coolant indicator activation, along with symptoms like engine misfire and stalling. The cause is identified as broken cylinder head bolts, allowing coolant to enter the engine oil. Remedies include removing cylinder heads, measuring piston deck height, and changing engine oil. Parts and work units are detailed for effective repair.