Chevrolet 1949 Bedienungsanleitung PDF herunterladen

CHEVROLET

1949 ALL

PASSENGER

CARS

Engine

ENGINE

CONTINUED FROM PRECEDING PAGE

CYLINDER HEAD INSTALLATION: See Chevrolet

Special Data.

PISTONS: Passenger Cars. Cast aUoy Iron, flat head,

cam ground, tin plated type with sUpper skirt.

Truck Pistons. Same as Pass. Cars except heavier.

Truck pistons marked with smaU boss on underside

of each pin boss. CAUTION—Do not interchange

pistons (must be same type in one engine).

Weight^l.56 lbs. (Pass. Cars).Length—3.75" (min.).

Removal—Pistons and rods removed from above.

Clearance—Top: .0155-.0235". Skirt: Selective Fit.

See Fitting New Pistons below.

Replacement Pistons: See

Chevrolet

Special Data.

NOTE—To install new pistons, hone cylinder for

.005"

oversize, rebore and hone for other sizes (re-

bore .002" less than piston oversize, finish by honing

for piston clearance—see fit below). CyUnder bore

taper and out-of-round must not exceed

.001".

Fitting New Pistons: Use feeler gauge between piston

and cylinder wall at right angles to pin bosses.

Piston should pass through bore with Ught pressure

on .002" feeler, and lock on

.003"

feeler.

PISTON RINGS: Two taper face compression rings

(with greatest diameter at bottom), one slotted oU

ring per piston, all above pin. OU ring groove drilled

for oU drainage.

Ring Width End Gap® Side Clearance

Compr 1235-.1240" 005-.015" 0015-.003"®

OU Cont 1860-.1865" 005-.015" 002-.0035"®

®—End Gap Worn Limit—1/32" max.

®—Side Clearance Checking—smaUer feeler should

be free, larger feeler should give a heavy drag.

InstaUing Compr. Rings—Side marked "TOP" up.

Replacement Rings: Furnished Standard size and

.005",

.020", .030", .040" Oversize.

Expander Type Rings—Furnished for use in cyUn-

der bores of indicated oversizes as foUows: Standard

(Bore Std. to .009" Oversize), .020" Oversize (Bore

.010"

to .029" Oversize—(ring gaps must be fUed for

bores less than .020" Oversize), .030" Oversize (Bore

.030"

to .039" OS.), .040" OS. (Bore .040" to .049" OS.).

PISTON PIN: Diameter— .8645-.8650". Length 3.135-

3.165". Pin locked in rod (piston bronze bushed).

Pin Fit in Piston—Thumb push fit (at room temp.).

Replacement Pins: Std. &

.003",

.005",

.010" oversize.

NOTE—New pistons fitted with bushings and pins.

If bushings reamed, use piston pin bushing fixture

to insure reaming at right angles to piston skirt.

CONNECTING ROD: Length—6 13/16". Wgt. 30.7 ozs.

Crankpin Journal Diameter—2.311-2.312".

Lower Bearing—Spun high-lead, thin-waU babbitt.

Clearance—.0003-.0013" selective fit (see Bearing

Adjustment foUowing).

Sideplay—.004-.012" at lower end (rod to crankpin),

.015"

minimum at upper end (rod to piston pin boss).

Bearing Adjustment: SoUd shims. Remove shims

equally at both sides to secure 'snap fit* (rod tight

to hand but should snap from one side to the other

with light tap of 8 oz. hammer), then replace one

.002"

shim on one side for clearance (if unequal

number, place extra shim on camshaft side). Bear-

ing clearance correct when rod can be snapped back

and forth on crankpin with one hand (grasp bear-

ing cap between thumb and index finger to test).

Palnut Note—Palnuts used to lock rod bolt nuts.

Use new palnut (instaU with open side toward end

of bolt), turn palnut up finger tight against rod

bolt nut, then tighten palnut Yz turn additional.

InstaUing Rods: Numbers on rods and caps must be

together and instaUed in same numbered cylinder

with numbers and pin clamp bolt toward camshaft

side.

InstaU oU dippers on rods with mouth toward

camshaft side of engine. Check dipper height.

Dipper Height Adjustment—See "Oiling System" in

Chevrolet Special Data.

CRANKSHAFT: Four-bearing type with integral

counterweights and vibration dampener.

Vibration Dampener—See Chevrolet Special Data.

Journal Diameters—#1, 2.6835-2.6845"; #2, 2.7145-

2.7155";

#3, 2.7455-2.7465"; #4, 2.7765-2.7775".

NOTE—Journal taper or out-of-round limits

.001".

Run-out limits for #2 and #3 journals .002".

Bearing Type—Steel-backed "Precision" type thin-

WaU babbitt. Do not require line-boring or reaming.

m-CAUTION— #1 (front) and #2 (front intermediate)

bearings similar in appearance but must not be inter-

changed. #2 bearing marked by letter "1" in oil groove.

Clearance— .0007-.0024" selective fit. See Bearing

Adjustment (below).

•i\OTE—Precision type bearings can be replaced singly.

Bearing Adjustment: Solid shims. Remove shims untU

slight drag secured when shaft turned by hand,

then replace one .002" shim on one side for clear-

ance (if unequal number of shims used, place extra

shim on same side for ail bearings).

Replacement Bearings: New "Precision" type bearings

furnished for all engines Std. size and .002", .010",

.020",

.030" Undersize.

•Bearing InstaUation—Not necessary to remove crank-

shaft or engine from car. See "Crankshaft & Main

Bearings"

in Chevrolet Special Data.

Bearing Cap InstaUation—Intermediate (#2 & 3)

bearing caps marked for Identification. InstaU #2

cap with mark "FRONT" toward front of engine,

#3 cap with mark "REAR" toward rear of engine.

^•CAUTION—Rear intermediate (#3) bearing is special

flanged type (takes end thrust).

Crankshaft Oil Seal Servicing: See Chevrolet Special

Data for Front (Timing Gear Cover) and Rear Oil Seals.

End Thrust: Taken by #3 (rear intermediate) bear-

ing. To check endplay, force crankshaft to rear,

check clearance at rear of #3 bearing. Adjust by

replacing bearing. Endplay—.003-.009".

CAMSHAFT: Four bearing type. Helical gear drive.

Journal Diameters—#1, 2.0282-2.0292"; #2,

1.9657-

1.9667";

#3,

1.9032-1.9042";

#4,1.8407-1.8417".

NOTE—Journal out-of-round limits

.001".

Run-out

limits .002" (straighten if run-out excessive).

Bearing Type—Steel-backed, babbitt-lined bush-

ings (staked in place). NOTE—New bearings must

be line-reamed. Clearance—.002-.004".

Bearing InstaUation—See Chevrolet Special Data.

End Thrust: Taken by thrust plate behind camshaft

gear (gear position on shaft controls endplay).

Endplay Adjustment—See

Chevrolet

Special Data.

Endplay—Free fit to

.003"

maximum.

Timing Gears: Crankshaft gear steel. Camshaft gear

BakeUte and Fabric composition.

Max.

Gear

Runout—.003"

crankshaft,

.004"

camshaft.

•235"

Truck Engine Timing Gear Set^-Aluminum

camshaft gear with bonded steel hub used with

crankshaft gear having crowned teeth.

Replacement Timing Gears, and Gear InstaUation

& AUgnment—See Chevrolet Special Data.

Timing Gear Backlash—.003-.004".

Camshaft Setting: Gears punch marked. Punch marks

on both gears must be lined up and directly opposite

each other.

VALVES: Head Diam. Stem Diam. Length

Intake 1 41/64" 3410-.3417"..6.260-6.290"

Exhaust 1 15/32" ....3400-.3407"..4.839-4.869"

Seat Angle Lift Stem Clearance

Intake 30° 2941" 001-.003"

Exhaust — 30° 3118" 002-.004"

NOTE—Intake valves have flat head.

Valve InstaUation (with rubber Valve Stem

Seals):

Special synthetic rubber oU seal ring instaUed in

groove in valve stem directly below seat locks (re-

tained by valve cap).

NOTE—Longer valve spring cap is used (inter- *

changeable for intake & exhaust valves—may be

identified by 1/16" annular groove on top surface).

No cap covers used with this type assembly.

Valve Stem OU Seal InstaUation—See "Valve System"

in Chevrolet Special Data.

Valve Guides: New precision type. Pressed in head.

Valve Guide InstaUation—See "Valve System" in

Chevrolet Special Data.

Valve Springs: InstaU springs with closed-coU end

toward cylinder head. Check springs with KMO-607

Tester, replace if outside limits of 124-140 lbs. at

V/z". Spring free length 2y

Spring Pressure Length

Valve Closed 53-63 lbs 1.821"

Valve Open 124-140 lbs

1.505"

Valve Lifters: Barrel type with pushrod seat brazed

on upper end. Lifter diameter .989-.990".

Clearance—.001"

(selective free fit).

Rocker Arm Assembly: Armasteel type (no bushings).

Four types of rocker arms used as follows:

Intake—No. 839463 (Left), 839464 (Right).

Exhaust—No. 839459 (Left), 839460 (Right).

Rocker Shaft Diameter—.7910-.7917" (bore diameter

in rocker arm .7925-.7935").

Rocker Arm Assembly & InstaUation—See "Valve

System"

in Chevrolet Special Data.

VALVE

TIMING

•VALVE TAPPET CLEARANCE: CAUTION—Engine

temperature must be "normalized" before adjusting.

See "Tappet Clearance Adjustment" in Chevrolet Special

Data.

Setting (with Engine "Normalized")—.006-.008" In-

take,

.013-.015" Exhaust.

Valve Timing: See Camshaft Setting above.

Intake Valves—Open 1° ATDC. Close 39° ALDC.

Exhaust Valves—Open 42° BLDC. Close 9° ATDC.

Valve Timing Check—Remove aU tappet clearance

from #1 exhaust valve, turn engine over untU this

valve just starts to close and untU triangular fly-

wheel mark lines up with pointer in right front face

of flywheel housing, mount dial indicator on rocker *

shaft support with stem contacting #1 exhaust

valve adjusting screw, set Indicator dial at .044".

Turn crankshaft until indicator hand just stops

moving. Timing is correct if indicator reading is

ZERO plus or minus .004". Reset tappet clearance

at correct running figure (above).

LUBRICATION

Engine Oiling System: Pressure and positive splash

system. Pressure to main bearings, camshaft bear-

ings,

timing gears, and to overhead valve system

(low pressure). Connecting rod bearings lubricated

by oU dippers which scoop oU from troughs (low

CHEVROLET 1
1949 ALL 1

Inhaltsverzeichnis

Seite 1 - 1949 ALL

24 CHEVROLET 1949 ALL PASSENGER CARS Engine ENGINE CONTINUED FROM PRECEDING PAGE CYLINDER HEAD INSTALLATION: See Chevrolet Special Data. PISTONS: Pass

Kommentare zu diesen Handbüchern

Keine Kommentare

Chevrolet 1949 Bedienungsanleitung

Stöbern Sie online oder laden Sie Bedienungsanleitung nach Autos Chevrolet 1949 herunter. CHEVROLET 1949 ALL PASSENGER CARS Engine ENGINE Benutzerhandbuch

Inhaltsverzeichnis

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Autos Chevrolet 1949