Symptom Chart - Transmission (Manual) Noise/Vibration

SYMPTOM CHART - TRANSMISSION (MANUAL) NOISE/VIBRATION

Condition	Possible Sources	Action
Clutch rattling noise - occurs with clutch engaged, noise changes/disappears with clutch pedal depressed	Flywheel bolts, clutch housing bolts or clutch pressure plate bolts loose.	TIGHTEN the bolts to specifications. CHECK the bolts for damage.
Clutch squeaking noise - noise is heard when the clutch is operated. Vehicle moves slowly or creeps when the clutch is disengaged. Can also be difficult to shift into 1st and REVERSE gear	Pilot bearing seized or damaged.	INSTALL a new pilot bearing.
Clutch squeaking noise - occurs with clutch pedal depressed/released	Worn clutch pedal shaft or bushings.	INSPECT the clutch pedal for wear or damage. REPAIR as necessary.
Clutch whirring/rattle noise - occurs when clutch pedal is depressed	Worn, damaged or misaligned clutch release bearing.	INSTALL a new clutch release bearing.
Clutch grating/grinding noise - occurs when clutch pedal is depressed	Clutch pressure plate fingers bent or worn.	INSPECT the clutch pressure plate release fingers. INSTALL a new pressure plate as necessary.
	Contact surface of clutch release bearing worn or damaged.	INSTALL a new clutch release bearing.
Clutch chatter - a small amount of noise when clutch pedal is released at initial take-off	Clutch engagement.	Acceptable operating condition.
Clutch chatter/grabs - in some cases a shudder is felt. Occurs with clutch pedal depressed/released	Damaged or worn powertrain/driveline mounts.	INSPECT the powertrain/drivetrain mounts. INSTALL new mounts as necessary.
	Binding or dragging plunger of the clutch master cylinder or slave cylinder.	CHECK the master and slave cylinder operation. INSPECT the components for damage or wear. INSTALL a new master or slave cylinder as necessary.
	Grease or oil on the clutch disc facing.	CHECK the input shaft seal and rear main oil seal. REPAIR as necessary. INSTALL a new clutch disc.
	Clutch disc surface glazed or damaged.	INSPECT the clutch disc surface for a glazed, hardened or damage condition. CARRY OUT a disc check. INSTALL a new clutch disc as necessary.
	Damaged or worn clutch pressure plate.	INSPECT the clutch pressure plate for wear or damage. INSTALL a new clutch pressure plate as necessary.
	Flywheel surface damaged or glazed.	INSPECT the flywheel for damage or wear. CARRY OUT a flywheel runout check. INSTALL a new flywheel as necessary.
Clutch chatter noise - noise when clutch pedal is released at initial take-off. Clutch is hard to engage and disengage	Pilot bearing worn, damaged or not correctly aligned in bore.	INSPECT the clutch pressure plate release fingers for uneven wear, clutch components burnt or a seized pilot bearing. INSTALL a new pilot bearing as necessary.
Clutch vibration	Loose flywheel bolts. Damaged or loose clutch pressure plate. Excessive flywheel runout.	GO to PINPOINT TEST L .
Transmission rattling/clattering noise - noise at idle or on light acceleration from a stop. Gear selection difficult	Gearshift lever joint worn or damaged.	INSTALL a new gearshift lever.
	Gearshift lever loose.	TIGHTEN the bolts to specification.
Transmission rattling/clattering noise - occurs in neutral or in gear, at idle	Incorrect fluid level or fluid quality.	CHECK that the transmission is filled to the correct level and with the specified fluid.
Transmission rattling/clattering noise - noise at idle in neutral	Worn or rough reverse idler gear.	CHECK the reverse idler gear. REPAIR as necessary.
	Rough running engine, cylinder misfire.	CHECK the ignition system. CARRY OUT a cylinder power test.
	Excessive backlash in gears.	CHECK the gear backlash. ADJUST as necessary.
	Worn countershaft gears.	REPAIR as necessary.
Transmission whine - a mild whine at extreme speeds or high RPM	Rotating gears/geartrain.	Acceptable noise.
Transmission whine - a high pitched whine, also described as a squeal	Transmission gears are worn (high mileage vehicle).	Result of normal gear wear. REPAIR as necessary.
	Mismatched gear sets.	INSPECT the gear sets for an uneven wear pattern on the face of the gear teeth. REPAIR as necessary.
	Damaged or worn transmission bearing.	INSPECT the transmission bearings. INSTALL new bearings as necessary.
Transmission growling/humming - noise occurs in the forward gears. The noise is more prominent when the gear is loaded. The problem gear can be located as the noise occurs in a specific gear position	Gear is cracked, chipped or rough.	INSPECT the transmission gears for damage or wear. INSTALL new gears as necessary.
Transmission hissing - noise in neutral or in forward gears. As bearings wear or break up, the noise changes to a thumping noise	Damaged or worn bearings.	INSPECT the transmission bearings. INSTALL new bearings as necessary.
Transmission knocking/thudding - noise at low speeds in forward gears	Bearings with damaged balls or rollers or with pitted and spalled races.	INSPECT the transmission bearings. INSTALL new bearings as necessary.
Transmission rumble/growl - noise at all speeds in forward gears, more pronounced in a heavy acceleration condition	Damaged or worn transmission bearing or gears (high mileage vehicles).	CHECK transmission fluid for excessive metal particles. REPAIR as necessary.