PSP FOR REPLACING WORN INTAKE VALVE AND/OR VALVE SEATS ON CERTAIN 3508, 3512, AND 3516 MARINE AND GENERATOR SET ENGINES - PS 0446 - MAILED US AND CANADA, CACO, COFA, BRZIL, CFEL, COSA, MARINE TEPS Caterpillar

PSP FOR REPLACING WORN INTAKE VALVE AND/OR VALVE SEATS ON CERTAIN 3508, 3512, AND 3516 MARINE AND GENERATOR SET ENGINES - PS 0446 - MAILED US AND CANADA, CACO, COFA, BRZIL, CFEL, COSA, MARINE TEPS

Usage:

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Caterpillar: Confidential Yellow

PSP FOR REPLACING WORN INTAKE VALVE AND/OR VALVE SEATS ON CERTAIN 3508, 3512, AND 3516 MARINE AND GENERATOR SET ENGINES - PS 0446 - MAILED US AND CANADA, CACO, COFA, BRZIL, CFEL, COSA, MARINE TEPS

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-120
A-80
AU-78
B-24
E-75
O-93
TM-5
1105, 1103  PS0446
NOTE: This Program can only be administered after a failure
occurs. The decision whether to apply the Program is
made by the dealer. When reporting the repair, use
"PS0446" as Part Number, "7755" as Group Number, and "96"
as Description Code.

Termination Date

June 30, 1991

Problem

The intake valves and/or valve seats may wear and result in repeated
decreases in valve clearance on certain 3508, 3512, and 3516 Marine and
Generator Set Engines. New inlet valve seats, valves and valve guides can be
installed to increase the service life of the intake valves.

Affected Product

Model Identification Number
3508 96Y1-991
23Z1-2662
69Z1-504
70Z1-713
3512 50Y1-841
24Z1-2811
66Z1-355
67Z1-720
3516 25Z1-1673
29Z1-907
72Z1-388
73Z1-294

Parts Needed

Quantities Per Cylinder Head
2 - 7E4609 Valve
2 - 7E5862 Valve Seat Insert
2 - 2M4453 Seal
1 - 7N5080 Gasket-Inlet
4 - 8N6862 Seal
4 - 8N6863 Seal
1 - 7W7730 Gasket-Cylinder Head
1 - 7W8145 Gasket-Exhaust
1 - 9Y1484 Gasket-Spacer Plate
2 - 9Y1847 Valve Guide

Action Required

Refer to the February 26, 1990 Service Magazine; page 17; "New Inlet/Exhaust
Valve With Improved Valve Seat Angle, New Valve Guide, New Cylinder Head
Assemblies With New Inlet Valve Seats".
Follow the procedures in the Service Manual to remove and disassemble the
cylinder heads.
Counterbore the inlet valve seat bore to 60.508 +/- 0.0254 mm (2.3822 +/-
.0010") to fit the new larger diameter inlet valve seat insert.
Install the new valve guides and valves in the cylinder head(s) and assemble
the engine.

Service Claim Allowances

Product Caterpillar Dealer Suggested Customer Suggested
smu Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs.
(C/L) (Sell)
Generator Set Engines
First Cylinder Head
0-4000 100% 4 0 4 0 0
4001-6000 33 1/3% 2 0 2 50% 4
Each Additional Cylinder Head
0-4000 100% 3.3 0 3.2 0 0
4001-6000 33 1/3% 1.6 0 1.6 50% 3.3
NOTE: This is an 8-hour job for the first cylinder head, and a 6.5 hour
job for each additional cylinder head.
Product Caterpillar Dealer Suggested Customer Suggested
smu Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs.
(C/L) (Sell)
Marine Engines
First Cylinder Head
0-4000 100% 8 0 0 0 0
4001-6000 50% 4 0 0 50% 4
Each Additional Cylinder Head
0-4000 100% 6.5 0 0 0 0
4001-6000 50% 3.2 0 0 50% 3.3
NOTE: This is an 8-hour job for the first cylinder head, and a 6.5 hour
job for each additional cylinder head.

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.