PIN AS 1106167 - Caterpillar

Inspect All 1117217, 1301066, 1483043, 1483056 And 0R4687 Cylinder Heads In Parts Stock
SMCS - 1103 PI7396
October 28, 1997
(Revised December 1997)
U-322
A-288
AU-258
S-155
H-83
O-275
TM-18 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.
This Revised Service Letter replaces the October 28, 1997 Service Letter. Changes have been made to the Termination Date and Action Required.
Termination Date
March 31, 1998Problem
All 1117217, 1301066, 1483043, 1483056 and 0R4687 Cylinder Heads in parts stock need to be inspected and may need to be reworked.
Action Required
Inspect all 1117217, 1301066, 1483043, 1483056 and 0R4687 Cylinder Heads in Parts Stock. The letter "B" will appear on the cylinder head after the serial number if the head has been previously inspected. Complete the following procedure on those cylinder heads which have not been previously inspected.
1. Position the cylinder head with an appropriate support.2. Remove the exhaust valves and position the cylinder head with the combustion side facing up.3. The exhaust valve face should be "blued" by applying a thin coating of Dychem bluing compound to the seating face area.4. The valve with the "blued" face should then be placed into the valve guide and slapped against the valve seat insert. This operation will transfer the bluing compound to the valve seat insert.5. The pattern on the valve face should extend across most of the valve seat insert face width.6. The pattern on the valve face should be a minimum of 3 mm wide and positioned toward the center of the seating area on the valve face. A thin line of contact at either the outside diameter or inside diameter of the valve seating face is UNACCEPTABLE. The valve should be replaced with a new part (1114680) and the "bluing" process repeated.
7. After the valve seating face has passed the 'bluing' inspection, the cylinder head should be stamped with a "B" after the serial number. The head can then be reassembled and returned to stock.Service Claim Allowances
Submit one claim for all 1117217, 1301066, 1483043, 1483056 and 0R4687 Cylinder Heads reworked.
Allow 4 hours labor for each cylinder head reworked.
When filing a claim, include the serial number of the parts inspected on the claim.
Parts Disposition
Return all replaced valves that were removed from parts stock and a copy of the claim to:
Caterpillar Inc.
Attn: Ralph Munguia - PI7396
Bldg B Claims Room
3701 State Road 26 East
Lafayette, Indiana 47905