SEAL-FOOTBALL 2667459 - Caterpillar

Engine:
C18 (S/N: GJE1-UP; EJG1-UP)
Industrial Engine:
C18 INDUSTRIAL (S/N: JDA1-UP; NBB1-UP; WJB1-UP; WJH1-UP; WRH1-UP)
Petroleum Engine:
C18 PETROLEUM (S/N: WJW1-UP; WJY1-UP)
Engine News SEBD9802, 8 August 2013, "A New Piston Is Used in Certain C18 Engines". This article has been updated to add new part numbers to the table. Description of Change: The new piston is now guided by a full piston skirt. Also, the new piston design eliminates the oil trays from the previous piston design.Adaptable To: The new 368-7818 Piston Body As and 368-7816 Piston Body As are a direct replacement in sets for the existing pistons in the serial numbers listed above. The change is adaptable back to first production. Refer to Table 1 for the compression ratios of the new part numbers.
Illustration 1 g02728212
(1) Existing piston body assembly (2) 368-7818 Piston Body As with the full piston shirt
Table 1
New Piston     Old Piston     Compression Ratio    
368-7818     329-4511     18:01    
368-7816     329-4510     16.3:1    
368-7815     319-6715     14.5:1    Note: The new pistons must be changed as an entire set. The weights between the new and existing pistons do not match.