scope:

This specification covers material composition and properties requirements of the carbon scraper ring material for diesel engine cylinder liners

Restricted Chemical Substances

All product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification.

APPLICATION

This specification covers material for a diesel engine cylindrical component known as a carbon scraper ring, protection ring, fire ring, or anti-polishing ring that is inserted in the upper part of an engine cylinder liner in the position of a top dead centre above the top land of the piston (Figure 1). Its functions and characteristics are:

• Scrapes off the hard carbon deposit which forms on the top land of the piston.

• Helps to prevent the inner cylinder wall from wearing and to keep lubricating oil consumption low level.

• Same heat expansion as a cylinder liner by using same material.