PRIORITY PARTS STOCK ACTION NEEDED UNDERSIZE PUSHROD CUP CAN CAUSE OVERHEATING OF PUSHROD AND ADJUSTING SCREW ON CERTAIN 350 0 SERIES ENGINES - MAILED US AND CANADA, LIMITED CACO, COFA CFEL, COSA Caterpillar

PRIORITY PARTS STOCK ACTION NEEDED UNDERSIZE PUSHROD CUP CAN CAUSE OVERHEATING OF PUSHROD AND ADJUSTING SCREW ON CERTAIN 350 0 SERIES ENGINES - MAILED US AND CANADA, LIMITED CACO, COFA CFEL, COSA

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PRIORITY PARTS STOCK ACTION NEEDED UNDERSIZE PUSHROD CUP CAN CAUSE OVERHEATING OF PUSHROD AND ADJUSTING SCREW ON CERTAIN 350 0 SERIES ENGINES - MAILED US AND CANADA, LIMITED CACO, COFA CFEL, COSA

NOTE: The information supplied in this service letter may not be valid after the termination date of this program. Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.


UNDERSIZE PUSHROD CUP CAN CAUSE OVERHEATING OF PUSHROD AND ADJUSTING SCREW ON
CERTAIN 3500 SERIES ENGINES, 1208, PI3157
U-65
A-29.1
AU-51
C-64
E-43
O-45
priority
parts stock action needed

Termination Date

June 30, 1987

Problem

The cup portion of some 4W6682 Pushrods are undersize. This results in
overheating of the pushrod and the adjusting screw and possibly breakage of
either of these components.

Affected Product

(SEE ILLUSTRATION)

Parts Needed

Use as needed: 4W6682 Pushrod
7C204 Screw

Action Required

PARTS STOCK
Remove all 4W6682 Pushrods with package date of 2-86, 3-86 and 4-86 from parts
stock.

Affected Product

Remove the valve covers and check the cup area of the pushrods for
discoloration. If there is any discoloration, replace the pushrod and the
adjusting screw in the arm assembly. The discoloration may range from a light
amber to blueish. Also, normal wear will show as a polished area in bottom of
the cup. If the cup area is too small, there will be a polished line only
around the upper rim of the cup.
Adjust the valve lash and injector timing on all cylinders that have the
pushrods replaced.

Owner Notification

U.S. and Canadian owners will receive the attached Owner Notification.
WARRANTY ALLOWANCES
(SEE ILLUSTRATION)

Parts Disposition

Handle the parts in accordance with your Warranty Bulletin on warranty parts
handling.
MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.
Attach. (1-Owner Notification)
COPY OF

Owner Notification

 FOR U.S. AND CANADIAN OWNERS
XYZ Corporation
3240 Arrow Drive
Anywhere, YZ 99999
PRIORITY - Inspection of Pushrods
MODELS INVOLVED - 3500 Series Engines
Dear Caterpillar Product Owner:
The cup portion of some pushrods (valve and fuel injection mechanism) may be
too small. This can result in overheating of the pushrod and of the adjustment
screw in the rocker arm and possibly breakage of either of these components.
The pushrods in the engines listed below need to be inspected. If the cup
portion is too small, the pushrods and adjusting screw will be replaced. The
repair will be done at no cost to you.
Contact your local Caterpillar dealer immediately and schedule a time to have
this service performed. The inspection will take from one to two hours.
Replacement of pushrods, if necessary, will take from one to eight hours
depending on the number of pushrods that need to be replaced.
We regret the inconvenience this may cause you, but urge you to have this
service performed as soon as possible to prevent unscheduled downtime.
Caterpillar
Identification #(s)
Attached to June 28, 1986 Service Letter