Question about Fiat Strada
Hi Ernest, It would help us to know more about the type of vehicle your are referring to. Is it a manual or automatic box? Is it fitted into a small passenger vehicle (a car) or is it a commercial vehicle? Is it front wheel drive or rear? Is it a two by four or four by four? In the event of it being a four by four, is it full time or is it selectable? A humming from the gear box will usually become more pronounced in one particular gear. If that is the case, the noise usually denotes a problem with the roller needle bearings for that particular gear. If the noise is in all gears it usually means that the problem is with the lay shaft bearing or that the gear assembly has been damaged in some way. If it is front wheel drive, the same diagnosis will apply, but added to it can be a problem with the differential (which is housed in the same housing as the gearbox. If the vehicle has a manual box, the thrust bearing can also give a humming sound sometimes when the clutch is pressed or sometimes when released. The test for that is simple. Start the engine push the clutch pedal and listen for any change in the sound. If the noise becomes more pronounced when the pedal is pressed the problem will likely be with the thrust bearing. If however the noise reduces or disappears with the same action, the problem is more likely to be with the input shaft bearing of the box. (The spigot shaft which is driven by the clutch plate or torque converter. If the vehicle is automatic The same may apply, or there may be a problem with the oil pump inside the box. These are just a few of the possible diagnostics for the limited info you have provided. The more you explain the more we can help! regards John
Posted on Feb 11, 2012
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Posted on Jan 02, 2017
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