- Machine Engines:
- 3500B and 3500C High Displacement
Description of Change: New cylinder packs have been introduced for 3500 High Displacement Engines. The cylinder packs contain a one-piece forged steel piston (monotherm piston). This design is currently used on the 3500 Engines with standard displacement. A large circumferential slot separates the crown and the skirt. The crown and the skirt remain attached by the strut for the pin bore.
Table 1 illustrates the old part numbers and new part numbers. Illustration 1 shows the affected parts.
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Illustration 1 | g01916033 |
Forged steel piston (1) Piston (2) Rod (3) Piston cooling jet |
Adaptable To: The new pistons are a direct replacement for two-piece pistons which are currently used in 3500 High Displacement Engines. The new pistons have the same weight and balance as the previous pistons. The new pistons can be used in the same engine with the previous pistons. However, the following cylinder packs and pistons require the 204-5447 Piston Cooling Jet Assemblies and the 193-3282 Retainer Assemblies (Piston Cooling Jet). When you are ordering and replacing cylinder packs, the cooling jet and the retainer must also be ordered and installed.
- 10R-9224 Cylinder Pack As
- 20R-0582 Cylinder Pack As
- 331-9822 Piston
- 339-3027 Piston Assemblies
Machine     | Engine     | Old     |     | New     | ||
789C 793C 793D 994F     |
3516B HD     | Reman Cylinder Pack     | 10R-4029     |     | Reman Cylinder Pack     | 10R-9224 (1) (2) (3)     |
Piston Crown | 172-0919 |     | Piston Assemblies     | 331-9822 (1) (2) (3)     | ||
Piston Skirt | 155-5271 |     | Cooling Jet     | 204-5447 (2)     | ||
Cooling Jet | 162-3898 |     | Cooling Jet Retainer     | 193-3282 (2)     | ||
Cooling Jet Retainer | 121-3558 |     | Piston Pin     | 302-3451 (2)     | ||
Piston Pin | 138-8508 |     | Piston Pin Retainer     | 253-1238 (2)     | ||
Piston Pin Retainer | 8N-7296 |     |     |     | ||
797 797B     |
3524B HD     | Reman Cylinder Pack     | 10R-4029     |     | Reman Cylinder Pack     | 10R-9224 (1) (2) (3)     |
Piston Crown | 172-0919 |     | Piston Assemblies     | 331-9822 (1) (2) (3)     | ||
Piston Skirt | 155-5271 |     | Cooling Jet     | 204-5447 (2)     | ||
Cooling Jet | 162-3898 |     | Cooling Jet Retainer     | 193-3282 (2)     | ||
Cooling Jet Retainer | 121-3558 |     | Piston Pin     | 302-3451 (2)     | ||
Piston Pin | 138-8508 |     | Piston Pin Retainer     | 253-1238 (2)     | ||
Piston Pin Retainer | 8N-7296 |     |     |     | ||
785D     | 3512C HD     | Reman Cylinder Pack     | 10R-9258     |     | Reman Cylinder Pack     | 20R-0582     |
Piston Crown | 249-4512 |     | Piston Assemblies     | 339-3027 (1) (2) (3)     | ||
Piston Skirt | 155-5271 |     | Cooling Jet     | 204-5447 (2)     | ||
Cooling Jet | 162-3898 |     | Cooling Jet Retainer     | 193-3282 (2)     | ||
Cooling Jet Retainer | 121-3558 |     | Piston Pin     | 302-3451 (2)     | ||
Piston Pin | 138-8508 |     | Piston Pin Retainer     | 253-1238 (2)     | ||
Pin Retainer | 8N-7296 |     |     |     |
( 1 ) | Drilled rods must be used. |
( 2 ) | All parts in the new column must be used together. Mixing of two-piece piston parts with monotherm pistons will result in severe engine damage. |
( 3 ) | Monotherm pistons can be mixed in the same engine with two-piece pistons. However, be sure that the correct cooling jet and the retainer are used with each piston. |
NOTICE |
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Failure to install the correct piston cooling jet, the retainer, and the connecting rod will result in inadequate lubrication. Inadequate lubrication will cause piston seizure and catastrophic engine damage. Verify that the correct parts are installed. |
Effectivity One Piece Piston Cylinder Packs for 3500 High Displacement Engines     | |
Sales Model     | Serial Number     |
New Engines     | |
785D     | S/N:B7F00193     |
789C     | S/N:8WM02262     |
793C     | |
793D     | |
994F     | |
797     | S/N:3TN00944     |
797B     | |
Reman Engines     | |
789C     | S/N:MSX00261     |
793B     | S/N:KNS00569     |
793C     | S/N:CPW01116     |
793D     | S/N:MSK00228     |
797 797B     |
S/N:CND00430 S/N:NPM00196 S/N:SKN00294 S/N:SPM00355     |
994F     | S/N:KDK00208     |