The thrust bearing clearance should be no more than .008 thousandths of an inch or .020 mm. Thrust bearings are bearings that locate the crank shaft longitudinally in the engine block. If no noise can be heard, go on to Step 2. These bearings can sometimes wear out and as a result cause noise. After identifying the problem, you then must determine the underlying root cause. But the way it sounds in the book, is that the thrust washer is bearing number 3. STEP 2. If your vehicle has a worn out main engine bearing or rod bearing, your car will usually display some or all of the common symptoms: Knocking Noises - If your car engine knocks upon starting the car, there is a good chance that your engine bearings are worn and need to be replaced. This is most common with vehicles with manual transmissions. It is quite common for bearings to begin making noises once a defect emerges. If you hit an obstruction while underway, the thrust bearing will protect your transmission from damage. Symptoms of Worn Out Engine Bearings. Since putting grease in the bearing quiets the noise and allows for a period of relief, more than likely the issue is with the bearing. any bearing noise is heard, the gearbox bearings are at fault. 48 2015 engine professional Thrust bearing failures are not usually very common, but when they do happen the cost of repair can be significant. Throw out bearings typically only make noise with the clutch depressed, same thing with the clutch. It could be a trans input shaft bearing if it's a whining noise but it's most likely the flywheel. Are the sides of the top part of the bearing the thrust … A more distinct knock is routinely attributed to worn rod bearings. I've seen flywheels make a noise that sounds exactly like a rod knock until you push in the clutch. The thrust bearing eliminates problems with alignment of the engine and shaft. If an engine is assembled with too much end play in the crank, or if the thrust bearing fails, the forward […] The middle one. ... Had a few questions about some engine noise I have been having. End play is important because it limits the fore and aft movement of the crankshaft in the block. A sharp, irregular knock can be from a worn crankshaft thrust bearing. The pressure exerted on the crank shaft during clutch operation is what causes the bearings to wear. If you’re approaching a stop sign and you want the engine to continuously turn, then the clutch comes in handy for this. AdvertisementClick Here to Read MoreAdvertisement Thrust bearings are used to control end play in the crankshaft. This started recently but has been getting louder to the point when it actually stalled my motor out. RELEASE BEARING TEST With the gearbox still in neutral and the engine running, depress the clutch pedal only to the end of the release bearing free play. It makes the engine a lot quieter as much noise is transmitted thru the vibrating shaft. As for the clutch release bearing, this is the component that allows the engine to be disconnected after the clutch pedal is pressed because the bearing … Some detective work will need to be performed. Loudest when the engine is under load or acceleration, crankshaft knock can be diagnosed by paying close attention to the specific type of knock: A regular, rumble-like knock is often from worn main bearings. Looking for the root cause of a failure has caused some difference of opin-ions between engine and transmission builders. I was told to check my crank for in and out play due to the ppossibility of bad thrust washers. But now I have a loud noise coming from the engine bay. Go on to Step 2 a sharp, irregular knock can be from worn. The bearing the thrust washer is bearing number 3 once a defect emerges makes engine... 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