Chrysler 300/300 Touring/300C, Dodge Magnum. Instruction - page 94
198/210 Axle Components
1 - NUT, PINION FLANGE
11 - SHIM, PINION DEPTH
2 - FLANGE, PINION
12 - WASHER (2)
3 - SEAL, PINION
13 - SPACER, COLLAPSIBLE
4 - CONE, PINION TAIL BEARING
14 - GEAR, RING
5 - CUP, PINION TAIL BEARING
15 - CONE, DIFFERENTIAL SIDE BEARING
6 - CUP, DIFFERENTIAL SIDE BEARING
16 - DIFFERENTIAL
7 - HOUSING, AXLE
17 - SEAL, AXLE
8 - GEAR/SHAFT, PINION
18 - RING, SNAP
9 - CONE, PINION HEAD BEARING
19 - CUP, DIFFERENTIAL SIDE BEARING
10 - CUP, PINION HEAD BEARING
20 - COVER, AXLE HOUSING
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REAR AXLE - 198RII
LX
AXLE IDENTIFICATION
The 198 MM axle utilizes a barcoded label (1) which
is adhered to the top of the axle housing as shown.
The following information is found on the identification
label:
•
Traceability Code (Plant Use)
•
Axle Part Number
•
Axle Gear Ratio
DIAGNOSIS AND TESTING
GEAR NOISE
Axle gear noise can be caused by insufficient lubricant, incorrect backlash, incorrect pinion depth, tooth contact,
worn/damaged gears, or the carrier housing not having the proper offset and squareness.
Gear noise usually happens at a specific speed range. The noise can also occur during a specific type of driving
condition. These conditions are acceleration, deceleration, coast, or constant load.
When road testing, first warm-up the axle fluid by driving the vehicle at least 5 miles and then accelerate the vehicle
to the speed range where the noise is the greatest. Shift out-of-gear and coast through the peak-noise range. If the
noise stops or changes greatly:
•
Check for insufficient lubricant.
•
Incorrect ring gear backlash.
•
Gear damage.
Differential side gears and pinions can be checked by turning the vehicle. They usually do not cause noise during
straight-ahead driving when the gears are unloaded. The side gears are loaded during vehicle turns. A worn pinion
shaft can also cause a snapping or a knocking noise.
BEARING NOISE
The differential and pinion bearings can produce noise when worn or damaged. Bearing noise can be either a whin-
ing, or a growling sound.
Pinion bearings have a constant-pitch noise. This noise changes only with vehicle speed. Pinion bearing noise will
be higher pitched because it rotates at a faster rate. Drive the vehicle and load the differential. If bearing noise
occurs, the rear pinion bearing is the source of the noise. If the bearing noise is heard during a coast, the front
pinion bearing is the source.
Worn or damaged differential bearings usually produce a low pitch noise. Differential bearing noise is similar to
pinion bearing noise. The pitch of differential bearing noise is also constant and varies only with vehicle speed.
Wheel hub bearings produce noise and vibration when worn or damaged. The noise generally changes when the
bearings are loaded. Road test the vehicle. Turn the vehicle sharply to the left and to the right. This will load the
bearings and change the noise level. Where axle bearing damage is slight, the noise is usually not noticeable at
speeds above 30 mph.
198 Axle Identification Label
LX
REAR AXLE - 198RII
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LOW SPEED KNOCK
Low speed knock is generally caused by a worn U-joint or by worn side-gear thrust washers. A worn pinion shaft
bore will also cause low speed knock.
VIBRATION
Vibration at the rear of the vehicle is usually caused by a:
•
Damaged propeller shaft.
•
Missing propeller shaft balance weight(s).
•
Worn or out-of-balance wheels.
•
Loose wheel lug nuts.
•
Worn U-joints or CV joints.
•
Loose/broken springs.
•
Damaged axle shaft bearing(s).
•
Loose pinion gear nut.
•
Excessive pinion yoke run out.
•
Bent halfshaft(s).
Check for loose or damaged front-end components or engine/transmission mounts. These components can contrib-
ute to what appears to be a rearend vibration. Do not overlook engine accessories, brackets and drive belts.
All driveline components should be examined before starting any repair.
DRIVELINE SNAP
A snap or clunk noise when the vehicle is shifted into gear, can be caused by:
•
High engine idle speed.
•
Transmission shift operation.
•
Loose engine/transmission/transfer case mounts.
•
Worn U-joints or CV joints.
•
Worn or broken axle mount isolators.
•
Loose pinion gear nut and yoke.
•
Excessive ring gear backlash.
•
Excessive side gear to case clearance.
The source of a snap or a clunk noise can be determined with the assistance of a helper. Raise the vehicle on a
hoist with the wheels free to rotate. Instruct the helper to shift the transmission into gear. Listen for the noise, a
mechanics stethoscope is helpful in isolating the source of a noise.
DIAGNOSTIC CHART
CONDITION
POSSIBLE CAUSE
CORRECTION
Wheel Noise
1. Wheel loose.
1. Tighten loose nuts.
2. Faulty, brinelled wheel bearing.
2. Replace bearing.
Differential Cracked
1. Improper differential side bearing
preload.
1. Replace case and inspect gears
and bearings for further damage.
Set differential bearing preload
properly.
2. Excessive ring gear backlash.
2. Replace case and inspect gears
and bearings for further damage.
Set ring gear backlash properly.
3. Vehicle overloaded.
3. Replace case and inspect gears
and bearings for further damage.
Avoid excessive vehicle weight.
3 - 110
REAR AXLE - 198RII
LX
CONDITION
POSSIBLE CAUSE
CORRECTION
Differential Gears Scored
1. Insufficient lubrication.
1. Replace scored gears. Fill
differential with the correct fluid type
and quantity.
2. Improper grade of lubricant.
2. Replace scored gears. Fill
differential with the proper fluid type
and quantity.
3. Excessive spinning of one
wheel/tire.
3. Replace scored gears. Inspect all
gears, pinion bores, and shaft for
damage. Service as necessary.
Loss Of Lubricant
1. Lubricant level too high.
1. Drain lubricant to the correct
level.
2. Worn axle shaft seals.
2. Replace seals.
3. Cracked axle housing.
3. Repair as necessary.
4. Worn pinion seal.
4. Replace seal.
5. Worn/scored pinion flange
journal.
5. Replace pinion flange and seal.
6. Axle cover not properly sealed.
6. Remove, clean, and re-seal
cover.
Axle Overheating
1. Lubricant level low.
1. Fill differential to correct level.
2. Improper grade of lubricant.
2. Fill differential with the correct
fluid type and quantity.
3. Bearing preload too high.
3. Readjust bearing pre-load.
4. Insufficient ring gear backlash.
4. Re-adjust ring gear backlash.
Gear Teeth Broke
1. Overloading.
1. Replace gears. Examine other
gears and bearings for possible
damage.
2. Ice-spotted pavement.
2. Replace gears and examine
remaining parts for damage.
3. Improper adjustments.
3. Replace gears and examine
remaining parts for damage. Ensure
ring gear backlash is correct.
Axle Noise
1. Insufficient lubricant.
1. Fill axle with the correct fluid type
and quantity.
2. Improper ring gear and pinion
adjustment.
2. Check ring gear and pinion
contact pattern. Adjust backlash or
pinion depth.
3. Unmatched ring gear and pinion.
3. Replace gears with a matched
ring gear and pinion.
4. Worn teeth on ring gear and/or
pinion.
4. Replace ring gear and pinion.
5. Loose pinion bearings.
5. Adjust pinion bearing pre-load.
6. Loose differential bearings.
6. Adjust differential bearing preload.
7. Misaligned or sprung ring gear.
7. Measure ring gear run-out.
Replace components as necessary.
8. Housing not machined properly.
8. Replace housing.
LX
REAR AXLE - 198RII
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