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ENGINE
9 - 1
ENGINE
C O N T E N T S
Page
3.9L ENGINE SERVICE PROCEDURES
10
5.2L/5.9L ENGINE SERVICE PROCEDURES . . . 39
ENGINE DIAGNOSIS
7
Page
GENERAL INFORMATION
STANDARD SERVICE PROCEDURES
1
4
G E N E R A L INFORMATION
INDEX
Page
. . . 1
3.9L Engines
.
3.9L ENGINES
The 3.9 L i t e r (238 CID) six-cylinder engine is a 90°
V-Type, l i g h t w e i g h t , single cam, overhead valve en-
gine (Fig. 1). T h e cylinder block and cylinder heads
are cast i r o n . S p l i t crankpins are offset b y 22°. T h e
f i r i n g intervals alternate between 128° and 112°.
This engine is designed for unleaded fuel.
The cylinders are numbered f r o m f r o n t to rear; 1,
3, 5 on t h e left bank and 2, 4, 6 o n t h e r i g h t bank.
The f i r i n g order is 1-6-5-4-3-2 (Fig. 2).
C R A N K S H A F T : T h e nodular i r o n crankshaft is
supported b y four m a i n bearings. T h e No. 2 bearing
is t h e t h r u s t bearing. Crankshaft end sealing is pro-
vided by a f r o n t rubber seal a n d a rear "rope t y p e "
seal. The crankshaft r o t a t i o n is clockwise,
w h e n
viewed f r o m t h e front of the engine.
5.2L/5.9L Engines
Page
. . . 3
P I S T O N S : The pistons are cast a l u m i n u m (alloy
t i n coated). Three rings are used. Piston pins (press
f i t t e d i n t o t h e rods) j o i n t h e pistons to forged steel
connecting rods.
C A M S H A F T : The cast i r o n camshaft is mounted
i n four steel backed babbitt bearings. A t h r u s t plate
located i n front of the first bearing, and bolted t o the
block, controls end play. A helical gear located be-
tween t h e 12th cam lobe a n d rear bearing j o u r n a l ,
operates t h e o i l pump driveshaft a n d d i s t r i b u t o r . E i -
t h e r a d u a l roller chain or a n improved silent c h a i n
is used to drive t h e camshaft. These chains are en-
closed b y a cast a l u m i n u m cover. This cover holds
t h e front crankshaft seal, provides front o i l p a n clo-
sure, water pump m o u n t i n g a n d is embossed w i t h
raised t i m i n g m a r k s for strobe t i m i n g .
C Y L I N D E R H E A D S : Cylinder heads incorporate
valve shrouding to create turbulence-producing com
8909-70
Fig. 1 Six-Cylinder Engine—3.9 Liter
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