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GEAR TRAIN, SHAFT, BEARING SERVICE
CHAPTER 4 LAB MANUAL PAGE 61
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DIAGNOSIS OF NOISE, VIBRATION
Abnormal noise can be caused by
Faulty bearings Damaged clutches Worn oil pump Improper fluid level
Damaged planetary gears
Worn bands Contaminated
fluid
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VIBRATION
Most vibration problems are caused by torque converters.
Bad torque converters. Improperly mounted torque
converter. Cracked flex plate
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NOISE
Customer complaints about transmissions can be incorrect.
Other causes could be Bad CV or U-joints Wheel bearings Brake calipers
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VIBRATION DIAGNOSIS
Pay attention to
Engine speed Vehicle speed Engine load Trans range
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NOISE DIAGNOSIS
If noise occurs at all times and engine speeds– Trans oil pump– Converter
If noise only occurs in one range– Planetary gear set– Clutch or Band
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INSPECTION
Determine what particles are made of Use a magnet to see if particles are
steel or aluminum. Plastic can come from torque
converter Each piece must be carefully
inspected.
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TRANSMISSION REMOVAL 1. Remove pan to drain oil and inspect debris. Remove drive line Disconnect cooler lines Disconnect shift linkage, TV linkage or
Modulator. Disconnect neutral safety switch, if Trans
mounted.
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TRANSMISSION REMOVAL
Remove inspection cover, converter bolts.
Remove starter Place Trans jack, remove
crossmember Remove 6 Trans to engine bolts
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TRANSAXLE REMOVAL
Removal of axle shafts Removal of sub frame
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TRANS INSTALLATION
Make sure dowel pins are in the engine block.
Not in the transmission. Make sure converter is free at all
times. Don’t allow Trans to hang.
Put bolts in the hole they came from. Page 66
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COMPUTER RELEARN
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DISASSEMBLY
Things to check before disassembly. Measure depth converter fits into
transmission case. Inspect felxplate for cracks or warpage. Inspect ring gear teeth for damage.
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CONVERTER
Check converter attaching bolts or bolt holes.
Check converter neck where seal rides. Check converter neck where bushing
rides. Check oil pump drive lugs. Check splines on input, stator, and
pump drive. Page 70
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DISASSEMBLY
Things to check before disassembly. Look up how to Check end play Measure end play, write it down. End play should be set to the low end of
specification. Some transmissions may have more
than one end play check.
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CLEAN WORK AREA There is no such thing as being to
clean. The correct position of all parts is of
great importance. Internal components can be washed
with solvent and dried. Each subassembly should be
completely disassembled.Page 73
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INSPECTION
Inspect each piece tree times. Inspect once during disassembly. Inspect during cleaning of the parts. Inspect during reassembly.
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BASIC DISASSEMBLY
When possible use a holding fixture. Remove bellhousing if possible. Remove all external switches,
modulators, governor. Remove speedometer driven gear and
adapter.
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BASIC DISASSEMBLY
Remove pan and valve body. Any servos or other devices from oil
pan area. Remove front pump. Loosen band adjustment, remove struts. Remove drums, front & rear.
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BASIC DISASSEMBLY
Remove snap ring. Remove gear train. Planetarys, internal gears, sun gear. Remove rear band. Overrunning clutch, and rear clutch
piston.
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Final Drive Components
The unit is a transaxle disassemble the final drive.
Inspect all components.
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Speedometer Drive Service
Check for wear on the driven gear seal area.
Check to see if teeth are “applecored”. Check adapter for wear. Check to see if the adapter has to be
“indexed”
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Parking Pawl
Examine the engagement lug on the pawl, making sure it is not rounded off.
Make sure return spring is in proper place.
If parking components do not operate correctly, the car may roll or drop into reverse, causing serious injury.
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Drive Chain
Drive chains should be inspected for stretch.
Inspect sprocket teeth for wear. Check bearings for smooth operation.
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Thrust Washers
Inspect for scoring, flaking, and wear. Always check end play and set to low
side of tolerance. Use assembly lube to hold in place. Never use grease.
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Bushings
Check all bushings for:– Clearance– Flaking– Scoring– Smearing
Check installed depth before replacing. Align any oil holes.
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Bearings
Check bearings for :– Pitting– Galling– Roughness
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Planetary Gear Sets
Check planetary gear sets for:– Stripped teeth– Chipped teeth– End play– Loose pinions– Rough pinions
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Shafts
Check shafts for:– Bushing & bearing surfaces– Seal surfaces– Open passageways– Sealing ring side clearance
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TRANSMISSION CASE
Should be thoroughly cleaned & passages blown out.
Check Bushings. Fluid passages. Bolt hole threads. Governor bore.
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TRANSMISSION CASE Check all Accumulator, Servo Bores for
scoring. Bores must also be checked for
scratches or gouges. Gasket surfaces must also be checked
for scratches. Check case for porosity. Check for warpage across valve body
surface. Page 89
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EXTENSION HOUSING
Check for cracks. Check Bushing, with feeler gauge. Install seal with proper driver.
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