KIT-SEAL 1386256 - Caterpillar

All 3500, 3500 with EUI, 3500B, and G3500 Commercial Engines Equipped with Deep Sump Oil PansDescription of Change: Several changes have been made to the deep sump oil pans on these engines. The first change was designed to improve the drain capability of the oil pans. The drain hole and the drain hole cover were redesigned in order to drain the engine oil more completely. The second and third changes strengthened the pans in order to help prevent cracking. The second change provided increased strength by adding internal baffles to the pan. The third change removed the additional baffles and strengthened the pan by increasing the wall thickness of the pan. Both the "increased baffle" pans and the "thick wall" pans help eliminate oil pan cracking on engines that are properly installed. The "thick wall" pans were introduced because they are easier to manufacture than the pans that include the extra baffles. New baffles are available to reinforce the earlier pans (without the additional baffles or thick wall). The extra baffles are not necessary on the thick-wall pans.
The distinguishing features of the new pans and the former pans are shown in the following illustrations.
Illustration 1.
(FRONT VIEW OF OIL PAN). Former drain hole on "original" pan (H).
Illustration 2.
(FRONT VIEW OF OIL PAN). Improved "teardrop" drain hole (H).
Illustration 3.
Typical "original" oil pan group with former cover (FRONT VIEW). 6V-4314 O-Ring Seal (1). 7N-6387 Cover (2).4B-2363 Drain Plug (3).
Illustration 4.
Typical new oil pan group with new cover (FRONT VIEW).125-9794 O-Ring Seal (4).149-9298 Cover (5).4B-2363 Drain Plug (6).
Illustration 5.
Top view of the 171-4563 Oil Pan Assembly ("Increased Baffles"). Additional baffles (A).Original baffles (B).
Illustration 6.
Top view of the 171-4562 Oil Pan Assembly ("Increased Baffles"). Additional baffles (A). Original baffles (B).
Illustration 7.
Top view of the 171-4561 Oil Pan Assembly ("Increased Baffles"). Additional baffles (A).Original baffles (B).Adaptable To: Table 1 lists the new and former part numbers for the deep sump oil pans on these engines. The part numbers in Table 1 are listed in the order in which the changes were implemented. The new "thick wall" pans are direct replacements for each of the former pans. The former pans have been canceled. When replacing the oil pans on these engines, use the new "thick wall" pan. For engines with pans that already include additional baffles, it is not necessary to replace the currently installed pan. Table 2 lists the effective engine serial numbers for the two latest pan designs. Engines with serial numbers prior to those listed in Table 2 can be updated to the increased-baffle design by adding the required quantity of 172-0915 Baffles.
A procedure has been developed to repair earlier pans that have cracked, and to add the new 172-0915 Baffles to the early ("first change") pans. To obtain this procedure, contact the 3500 Product Group at (765) 448-5911.