More Time On The Water. Preventative Maintenance Schedule For Cummins QSB6.7, QSC8.3, QSL9 and QSM11 Engines.

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Cummins Inc. Box 3005 Columbus, IN 47202-3005 U.S.A.

Phone: 1-800-CUMMINS™ (1-800-286-6467)Internet: marine.cummins.com

Twitter.com/CumminsEngines YouTube.com/CumminsEngines

Bulletin 5410779 Printed in U.S.A. 5/17 ©2017 Cummins Inc.

Component or SystemQSB6.7 QSC8.3/QSL9 QSM11

Action Required Interval Action Required Interval Action Required Interval

Zinc anode Replace 250 hrs or 6 months Replace 250 hrs or 6 months Replace 250 hrs or 6 months

Drive belts Check 250 hrs or 1 year

Lubricating oil and filter Drain up to 500 hrs* or 1 year Drain up to 500 hrs* or 1 year Drain up to 500 hrs* or 1 year

Engine mounted air cleaner assembly Clean 500 hrs or 1 year Clean 500 hrs or 1 year Clean 1500 hrs or 1 year

Spin on fuel filter Replace 500 hrs or 1 year Replace 500 hrs or 1 year Replace 250 hrs or 1 year

Seawater pump impeller Replace 500 hrs or 1 year Replace 500 hrs or 1 year Replace 1500 hrs or 1 year

Seawater hoses Check 500 hrs or 1 year Check 500 hrs or 1 year Check 1500 hrs or 1 year

Fuel-water separator Replace 500 hrs or 1 year Replace 500 hrs or 1 year Change 1500 hrs or 1 year

Engine coolant antifreeze Check 500 hrs or 1 year N/A N/A N/A N/A

Coolant filter N/A N/A Change 500 hrs or 1 year Change 1500 hrs or 1 year

Suplemental coolant additive (SCA) and antifreeze concentration N/A N/A Check 500 hrs or 1 year Check 1500 hrs or 1 year

Heat exchanger pressure cap Inspect for reuse 500 hrs or 1 year N/A N/A Inspect for reuse 1500 hrs or 1 year

Radiator pressure cap N/A N/A Inspect for reuse 500 hrs or 1 year

Battery cables and connections Check 500 hrs or 1 year Check 500 hrs or 1 year Check 1500 hrs or 1 year

Engine wiring harness Check 500 hrs or 1 year Check 500 hrs or 1 year Check 1500 hrs or 1 year

Cooling system Flush 2000 hrs or 4 years Flush 2000 hrs or 4 years

Vibration damper, viscous Clean 2000 hrs or 4 years Check 2000 hrs or 4 years Check 6000 hrs or 4 years

Crankcase ventilation filter Inspect for reuse 1500 hrs N/A N/A

Overhead set Adjust up to 5000 hrs** Adjust up to 5000 hrs** Adjust up to 5000 hrs**

Aftercooler assembly (seawater) Inspect for reuse 3 years Inspect for reuse 3 years Inspect for reuse 1500 hrs or 3 years

Turbocharger Check 1500 hrs or 1 year

Crankcase breather element (commercial engines) N/A N/A N/A N/A Replace 1500 hrs or 1 year

Crankcase breather element (recreational engines) N/A N/A N/A N/A Replace 6000 hrs or 4 years

More Time On The Water. Less Downtime For Maintenance. Lower Total Cost Of Ownership.

It’s a commonly held belief that boats are high-maintenance, yet

when your vessel is powered by a Cummins diesel, the truth is

just the opposite.

A recent analysis of routine maintenance practices on Cummins-

powered vessels, along with a meticulous review of the impact

on performance, reliability and durability of our engines, has

resulted in substantial increases in the recommended intervals

for required maintenance on our marine diesel engines in both

commercial and recreational use. That includes all Cummins

QSB6.7, QSC8.3, QSL9 and QSM11 engines, regardless of

model year.

As you will see from the maintenance chart, virtually all of the

normal maintenance items are now extended out to a year or

more if the hourly limit is not reached. Some procedures, such

as the cooling system flush and vibration damper cleaning,

need to be done only every four years or 2,000 hours. For most

owners, that means that you simply do an annual checkup. The

only exceptions to the list are the zinc anodes, which need to be

replaced every six months or 250 hours of operation. Having less

downtime for engine maintenance means a lower total cost of

ownership and an increase in the amount of time you can spend

on the water.

Operating Hours Versus Time-Based Intervals.

As you use this chart, please note that even though many specific

maintenance items should be performed at annual intervals,

the number of operating hours can vary between 250 hours

(draining and refilling the lube oil and filter and checking drive belts)

or 500 hours (most other service items). The required maintenance

should be performed when either threshold is reached. Some

items, such as the overhead set adjustment, are based solely on

hours of use while others, such as inspection of the aftercooler

assembly only on the QSB6.7, QSC8.3 and QSL9 are strictly on

a calendar basis. Aftercooler assembly has an hour interval of

1500 hours on the QSM11.

Check Online Before Casting Off Lines.

This chart is presented as a guideline based on information

available at the time of publication. Maintenance intervals are

subject to change, and could be updated to even longer periods

or more usage. Please check quickserve.cummins.com for the

most current maintenance procedures. When in doubt, contact

your authorized Cummins service provider. To find your local

provider, check marine.cummins.com or call Cummins Care to

speak with a Marine Specialist at 1-615-871-5101.

*500 hour oil drain intervals are available when exclusively using Ultra-Low-Sulfur Diesel (ULSD). **Recreational ratings should adjust the overhead set every 1,500 hours while commerical ratings can be extended out to 5000 hours.

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