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VW Tech 1
VW Tech 1, ASE Certified Technician
Category: Car
Satisfied Customers: 412
Experience:  20+ yrs. ASE Master Auto Tech, ASE Heavy Truck Tech, VW factory trained, MINI factory trained,
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Why do the cylinder walls glaze on a diesel when the engine

Resolved Question:

Why do the cylinder walls glaze on a diesel when the engine is left idling for long periods?
Submitted: 7 years ago.
Category: Car
Expert:  VW Tech 1 replied 7 years ago.

The cylinder walls glaze due to the rings not having the higher combustion pressures from being under load pushing them outward. This allows the rings and cylinders and oil to all rub each other until they are happy and polished . This glaze is a bunch of combustion by product embedded in the walls from the lack of scraping by the rings. If the engine runs fairly well when glazed - sometimes you can pull them or work them hard enough to self correct but often it requires a rebuild. If you try and work them you must watch your oil consumption as it will be higher until / if it unglazes.


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