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9 - 50 3.9L ENGINE
ENGINE SPECIFICATIONS - CONT.
V a l v e Springs
Free
Length
( A p p r o x . ) . . . . . . . . . . .
49.962
mm
FL.967 in)
Spring Tension . . . . . . . . . .
@ 41.66 mm = 378 N
(Valve
Closed)
{# 1.64
in = 85 lbs)
Spring Tension . . . . . . . . . . .
@ 30.89 mm = 890 N
(Valve Open)
(@ 1.212 in = 200 lbs)
Number of Coils . . . . . . . .
. 6.8
installed Height.
41.66 mm
(Spring Seat to Retainer)
(1.64 in)
Wire Diameter
4.50 mm
(0,177 In)
_ —.
J9409-98
OVERSIZE
AND U N D E R S I Z E ENGINE
C O M P O N E N T
MARKINGS
C O N D I T I O N
IDENTIFICATION
LOCATION OF IDENTIFICATION
CRANKSHAFT JOURNALS
(UNDERSIZE)
0.0254 mm (0.001 in.)
R or M
M-2-3 etc. (indicating no. 2 and 3 main bearing
journal)
and/or
R-l-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.
V A L V E 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.
J9309-81
V a l v e F I L I N G
Exhaust Valve
Closes (ATC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25°
Opens (BBC)
56°
Duration . . . . ,
264°
Intake Valve
Closes (ABC) . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . 65°
Opens (BTC)
8°
Duration
250°
Valve Overlap
31 °
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