First you need to identify the source of the deposits, one of the first ways is to see what color they are. White deposits are usually Siloxanes. Tan colored deposits arenormally associated with lube oil ash. Black or dark gray is usually carbon. In most cases its usually a mixture. Maybe you can post some pictures of your plugs?
What is your typical load? Are you running below 50% load for extended periods of time? Have you monitored lube oil consumption? Is it stable or increasing? Are there also cylinder deposits on the crown of the piston and fire deck of the head? What is you fuel source? Is it clean dry, free of contaminents? Are you using the correct lube oil for the application? Has this always been a problem for these engines, or have they been in service for awhile and now showing the problem? How many hours on the units? How often do you perform maintenance? How do you adjust air fuel ratio, do you use an emissions analyzer, or just use a target setting?
All of these things can affect the combustion process and in turn the deposit rates on internal components.
With some more information from you we may be able to offer some possible solutions or things to check further.
Mike L.
United States / Canada
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