Operation and maintenance manual

General Cleaning Instructions QSB4.5 and QSB6.7
Page i-10 Section i - Introduction
General Cleaning Instructions
Definition of Clean
Parts must be free of debris that can contaminate any engine system. This does not necessarily mean they have to
appear as new.
Sanding gasket surfaces until the factory machining marks are disturbed adds no value and is often harmful to forming
a seal. It is important to maintain surface finish and flatness tolerances to form a quality sealing surface. Gaskets are
designed to fill small voids in the specified surface finish.
Sanding gasket surfaces where edge-molded gaskets are used is most often unnecessary. Edge-molded gaskets are
those metal carriers with sealing material bonded to the edges of the gasket to seal while the metal portion forms a
metal to metal joint for stability. Any of the small amounts of sealing material that can stick to the parts are better
removed with a blunt-edged scraper on the spots rather than spending time polishing the whole surface with an air
sander or disc.
For those gaskets that do not have the edge molding, nearly all have a material that contains release agents to
prevent sticking. Certainly this is not to say that some gaskets are not difficult to remove because the gasket has
been in place a long time, has been overheated or the purpose of the release agent has been defeated by the
application of some sealant. The object however is just to remove the gasket without damaging the surfaces of the
mating parts without contaminating the engine (don't let the little bits fall where they can not be removed).
Bead blasting piston crowns until the dark stain is removed is unnecessary. All that is required is to remove the carbon
build-up above the top ring and in the ring grooves. There is more information on bead blasting and piston cleaning
later in this document.
Cummins Inc. does not recommend sanding or grinding the carbon ring at the top of cylinder liners until clean metal is
visible. The liner will be ruined and any signs of a problem at the top ring reversal point (like a dust-out) will be
destroyed. It is necessary to remove the carbon ring to provide for easier removal of the piston assembly. A medium
bristle, high quality, steel wire wheel that is rated above the rpm of the power tool being used will be just as quick and
there will be less damage. Yes, one must look carefully for broken wires after the piston is removed but the wires are
more visible and can be attracted by a magnet.
Oil on parts that have been removed from the engine will attract dirt in the air. The dirt will adhere to the oil. If possible,
leave the old oil on the part until it is ready to be cleaned, inspected and installed, and then clean it off along with any
attracted dirt. If the part is cleaned then left exposed it can have to be cleaned again before installation. Make sure
parts are lubricated with clean oil before installation. They do not need to be oiled all over but do need oil between
moving parts (or a good lube system priming process conducted before cranking the engine).
Bead blasting parts to remove exterior paint is also usually unnecessary. The part will most likely be painted again so
all that needs happen is remove any loose paint.
Abrasive Pads and Abrasive Paper
The keyword here is "abrasive". There is no part of an engine designed to withstand abrasion. That is they are all
supposed to lock together or slide across each other. Abrasives and dirt particles will degrade both functions.
WARNING
Abrasive material must be kept out of or removed from oil passages and parts wear points. Abrasive material
in oil passages can cause bearing and bushing failures that can progress to major component damage
beyond reuse. This is particularly true of main and rod bearings.
Cummins Inc. does not recommend the use of emery cloth or sand paper on any part of an assembled engine or
component including but not limited to removing the carbon ridge from cylinder liners or to clean block decks or
counterbores.
Great care must be taken when using abrasive products to clean engine parts, particularly on partially assembled
engines. Abrasive cleaning products come in many forms and sizes. All of them contain aluminum oxide particles,
silicon carbide, or sand or some other similar hard material. These particles are harder than most of the parts in the
engine. Since they are harder, if they are pressed against softer material they will either damage the material or
become embedded in it. These materials fall off the holding media as the product is used. If the products are used with
power equipment the particles are thrown about the engine. If the particles fall between two moving parts, damage to
the moving parts is likely.
If particles that are smaller than the clearance between the parts while they are at rest (engine stopped), but larger
than the running clearance then damage will occur when the parts move relative to each other (engine started). While
the engine is running and there is oil pressure, particles that are smaller than the bearing clearance are likely to pass
between the parts without damage and be trapped in the oil filter. However, particles larger than the bearing clearance
will remove material from one part and can become embedded in one of the parts. Once embedded in one part it will