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Alex Leu

Selespeed idle noise and grinding reverse

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Hello guys.

Issue: When idling there is a rattle noise in the transmission area, under the battery. When changing into reverse it makes a loud grinding noise (same as when trying to change a gear on a manual when while disengaging the clutch). The car runs smooth and changes the gears perfectly when driving. Thankfully the cam belt is fine and I didn't kill the engine.

Story: I love my Alfa and take great care of it. Though (I am ashamed to admit this) today I was parallel parking my car uphill, I was reversing just by releasing the gas pedal while being in first. When I had to make the maneuver up the hill (to finish parking), just out of habit I switched the gear up, thinking it is in reverse, pressed the gas, the engine stalled showing the "Oil pressure low" warning.

I am worried that I might have destroyed the transmission. I hope it is just the clutch release bearing.

Any of you guys had a similar issue? How likely is it that the transmission itself is damaged? I will get it to a service, because it is winter outside and I don't have a warm garage to check it out myself.

Cheers!

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Chances are that you need a clutch change, but first check there is oil in the gearbox and top it up if needed, connect the diagnostics up and ensure the clutch rod is the correct length, 28 - 28.5 mm, if the grinding persists then I'm afraid it's going to be gearbox off time, the reverse gear is buried right in the center of the box, so unless you are experienced in gearbox refurbishment then I suggest you have a specialist do this, but when you say there is a rattling at Idle... I fear that this is more than just a worn gear, this in fact sounds more like a collapsed front bearing and the clutch is now being used instead, acting as a bearing to hold the shaft roughly in position and amazingly this will allow the car to drive. The easy check for this is to remove the clutch speed sensor from the gearbox and look at the tip (It's the brass 22mm sensor with the red socket on the front of the gearbox next to the filler plug), it should be perfectly flat along the end, if there is ANY sign of a groove in it then I am afraid your front bearing has gone, it takes 2 minutes to check this with a double depth 22mm socket from the top.

 

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