PRIORITY - PARTS STOCK ACTION NEEDED - A NEW OIL REGULATOR AND OIL REGULATOR HOUSING NEED TO BE INSTALLED ON CERTAIN 3606, 360 8, 3612, AND 3616 ENGINES - PI3486 - MAILED US AND CANADA, CACO, COFA, CFEL, COSA, LIMITED BRAZIL Caterpillar

PRIORITY - PARTS STOCK ACTION NEEDED - A NEW OIL REGULATOR AND OIL REGULATOR HOUSING NEED TO BE INSTALLED ON CERTAIN 3606, 360 8, 3612, AND 3616 ENGINES - PI3486 - MAILED US AND CANADA, CACO, COFA, CFEL, COSA, LIMITED BRAZIL

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Caterpillar: Confidential Yellow

PRIORITY - PARTS STOCK ACTION NEEDED - A NEW OIL REGULATOR AND OIL REGULATOR HOUSING NEED TO BE INSTALLED ON CERTAIN 3606, 360 8, 3612, AND 3616 ENGINES - PI3486 - MAILED US AND CANADA, CACO, COFA, CFEL, COSA, LIMITED BRAZIL

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.


U-5
A-4
AU-5
B-1.1
E-5
O-5
PRIORITY
PARTS STOCK ACTION NEEDED
1330  PI3486
NOTE: Check to see if the Affected Product falls into
one group. If it is included in more than one of
the groups, do all applicable portions of the
rework at the same time.
COMPLETION DATE

Termination Date

July 31, 1991  January 31, 1992

Problem

A new tube assembly and oil regulator housing need to be installed on certain
3606, 3608, 3612, and 3616 Engines. The improved monitoring capability of
these parts will reduce the possibility of inaccurate temperature readings
and alarms.
**** Group 1 ****
Oil may leak past the oil temperature regulators on certain 3606, 3608, 3612,
and 3616 Engines. A new regulator housing that has improved sealing
capability needs to be installed.
**** Group 2 ****
The location of the oil temperature contacting sensors and oil temperature
gauge sensors on certain 3606, 3608, 3612, and 3616 Engines may permit
inaccurate readings and may not give alarms at the correct temperature. A
new tube assembly needs to be fabricated and installed.

Affected Product

Model Identification Number
**** Group 1 ****
3606 8RB292-310
3608 6MC1-250
3612 9RC15-32
3616 1PD18-24
**** Group 2 ****
3606 8RB1-358
3608 6MC1-288
3612 9RC13-64
3616 1PD1-36

Parts Needed

Dealers will need to order parts for this program.
**** Group 1 ****
1 - 7C6021 Housing
4 - 3S9643 Seal
2 - 6V5101 Seal
1 - 9Y9842 Gasket
**** Group 2 ****
4 - 2B0858 Plug
1 - 9Y9842 Gasket
2 - 3P0654 O-ring Seal
Fabricated Bosses

Action Required

**** Parts Stock ****
Remove all 7W3552 Regulator Housings from dealer and customer parts stock.
**** Affected Product ****
**** Group 1 ****
Remove the existing 7W3552 Regulator Housing and install the new 7C6021
Regulator Housing. Install the new 3S9643 Seals around the oil temperature
regulators and install the rest of the related parts.
**** Group 2 ****
Remove the existing 7W2493 Tube and modify the tube as shown in the
illustrations. Install the tube and the related parts. Relocate all of the
oil temperature sensors from the top of the 7W3553 Regulator Cover to the
ports in the modified 7W2493 Tube. Plug the open ports in the 7W3553
Regulator Cover.
****** IMAGE: SEBE4488.01001.001
CAPTION: Illustration 1 - Location of tube
****** IMAGE: SEBE4488.01001.002
CAPTION: Illustration 2 - Fabricate bosses
****** IMAGE: SEBE4488.01001.003
CAPTION: Illustration 3

Owner Notification

Not Applicable

Service Claim Allowances

Caterpillar Dealer Suggested Customer Suggested
Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs.
**** Group 1 only ****
100% 3  0 0 0 0
**** Group 2 only ****
100% 3  0 0 0 0
**** Group 1 and 2 ****
100% 6  0 0 0 0
NOTE: This is a 3 to 6 hour job.

Parts Disposition

Any parts removed (with the exception of cores used for Caterpillar
Remanufactured parts) can be rendered useless and scrapped immediately upon
completion of the repair.
MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.