Page 47-Z-3
DDFP-12FT; -12FH
ENGINE MATERIALS & CONSTRUCTION
Exhaust Valve
Type ......................................Poppet
Arrangement..........................Overhead Valve
Number/Cylinder....................4
Operating Mechanism............Mechanical Rocker Arm
Type of Lifter ........................Roller
Valve Spring
Number/Valve ......................1
Valve Seat Insert
Material................................GM3544M
Heat Exchanger
Type ......................................Tube & Bundle
Materials
Tubes & Headers ................70/30 CU/NI
Shell ....................................Cast Iron
Electrode..............................Zinc
Liners
Type ......................................Wet Liner
Material..................................Cast Iron
Ports
Type ....................................Oval
Number................................18
Main Bearings
Type ......................................Precision Half Shells
Journal Diameter ..................4.50 in. (114.3 mm)
Length ..................................1.24 in. (31.5 mm)
Projected Area/Bearing ..........5.58 in.2 (3600 mm2)
Material..................................Steel Backed Copper Lead
Piston
Type and Material ..................Crosshead Malleable Iron
Cooling ..................................Oil - Cocktail Shaker
Piston Pin Bushing
Material..................................Steel Backed Bronze
Piston Rings - Compression
Type
Top Ring ..............................Chrome Faced Keystone
Remaining 2 ........................Barrel And Chrome Faced
Piston Rings - Oil
Type ......................................Double Scraper with Expander
Number per Piston ................2 Sets
Location ................................Bottom of Skirt
Piston Pin
Type ......................................Crosshead - Polished & Hardened
Air Cleaner
Type ......................................Indoor Usage Only
Oiled Fabric Pleats
Material..................................Surgical Cotton
Aluminum Mesh
Camshaft
Material..................................Steel (SAE 1513)
Location ................................In Block, 1 Per Bank
Drive ......................................Gear
Type of Cam ..........................Ground
Camshaft Bearing - End
Journal Diameter ..................1.50 in. (38.0 mm)
Length ..................................2.12 in. (53.8 mm)
Material..................................Steel Backed Bronze
Camshaft Bearing -
Intermediate
Journal Diameter ..................1.50 in. (38.0 mm)
Length ..................................1.32 in. (33.5 mm)
Materials................................Aluminum
Connecting Rod
Type ......................................Forged I Section
Material..................................Forged Steel (SAE 1141)
Crank Pin Bearings
Type ......................................Precision Half Shell
Number..................................1 Pair Per Cylinder
Journal Diameter ..................3.00 in. (76.2 mm)
Length ..................................1.20 in. (30.5 mm)
Projected Area/Bearing ..........3.60 in.2 (2323 mm2)
Material..................................Steel Backed Copper Lead
Crankshaft
Material..................................Steel (SAE 1548)
Heat Treat ..............................Induction Hardened
Type of Balance ....................Dynamic
Cylinder Block
Type ......................................Two Piece
Material..................................Cast Iron
Cylinder Head
Type ......................................Slab 4 Valve
Material..................................Cast Iron
CDDA MAR 97 JTW