Dodge ram truck 3500 1996 Service Manual page 1044

I - 54 3.9L ENGINE B R
SPECIFICATIONS (Continued)
Valve Springs
Free Length (Approx.) 49.962 mm
(1.967 In)
Spring Tension . . . . . . . . . . . . . . . . . @ 41.66 mm = 378 N
{Valve Closed) (@ 1.64 in = 85 lbs)
Spring Tension @ 30.89 m m = 890 N
(Valve Open) (@ 1.212 in = 200 lbs)
Number of Coils . . . . . . . . . . . . . . . 6.8
Installed H e i g h t . . . . . . . . . . . . . . . . 41.66 mm
(Spring Seat to Retainer) (1.64 in)
Wire Diameter 4.50 mm
(0.177 in)
Valve Timing
Exhaust Valve
Closes (ATC) • 16°
Opens (BBQ .............................. 5 2 °
Duration 248°
Intake Valve
Closes (ABC) 50°
Ooens (BTC)
10°
Duration 240°
Valve Overlap 26°
J9309-33
ENGINE SPECIFICATIONS—CONT
CONDITION IDENTIFICATION
CRANKSHAFT JOURNALS
(UNDERSIZE)
0.0254 mm (0.001 in.)
R o r M
M-2-3 etc. (indicating no. 2 and 3 main bearing
journal)
and/or
R-1 -4 etc. (indicating no. 1 and 4 connecting rod
journal)
Steel stamped (near notch) on no. 6 crankshaft
counterweight.
HYDRAULIC TAPPETS
(OVERSIZE)
0.2032 mm (0.008 in.)
•
Diamond-shaped stamp
Top pad - front of engine and flat ground on
outside surface of each O / S tappet bore.
VALVE STEMS (OVERSIZE)
0.127 mm (0.005 in.)
X
Milled pad adjacent to two tapped holes
(3/8 in.) on each end of cylinder head.
J930S-81
OVERSIZE AND UNDERSIZE ENGINE COMPONENT MARKINGS