On June 15, 1988, Hastings Manufacturing
Company issued a bulletin warning against cleaning pistons
using pressure blast machines with glass beads or various
We continue to see rings with high
degrees of abrasive damage even in instances where cylinder
blocks have been bored and new pistons used. We see pistons
with the rings stuck in the grooves. We remove the rings and
clean them with solvent. The solvent is drained through an
absolute filter and the residue examined under a microscope.
We find glass beads in the absolute filter!
Bead and grit blast cleaning is a highly
cost effective and efficient method of cleaning other engine
parts such as blocks, heads, and intake manifolds. These parts
have many internal passages that are irregular with blind
ends and are virtually inaccessible to mechanical cleaning
methods. After bead or grit blasting it is imperative some
method of cleaning the castings is employed which removes
all the cleaning media from the internal passages. Even a
minute amount of cleaning material left in an oil or intake
passage will be ingested by the engine upon start up and severe
damage to all engine parts will result.
REMEMBER - ANY AMOUNT OF ABRASIVE
LEFT IN AN ENGINE IS TOO MUCH!