Knocking sound from drive axle tunnel - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 6 (permalink) Old 06-15-2019, 07:25 PM Thread Starter
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Knocking sound from drive axle tunnel

Hi everyone,

I've got my Spider "restoration" project close to completion (Still need to install the top), and I've been able to take some short runs to kinda test things out. Here's the problem: from a standstill, under moderate to heavy acceleration, I'm getting a knock against the drive shaft tunnel. When I inspected the driveshaft, it looks to be centered in the tunnel. I did notice that there is consiserable play coming from the driveshaft center support. Is that normal or is the rubber surround supposed to be harder? Thanks for any help.

Joe G.

'74 Spider
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post #2 of 6 (permalink) Old 06-15-2019, 07:38 PM
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I don't think that is normal. I had the center support fail on me, and had the same symptoms.

Mo in NJ
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post #3 of 6 (permalink) Old 06-15-2019, 09:23 PM
There should not be play from the center support. I'd suggest you replace the center bearing and have the driveshaft balanced. I'd also check the Universal joints.

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post #4 of 6 (permalink) Old 06-15-2019, 09:41 PM
But Mad North-Northwest
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Pretty common problem. Typically it's the transmission mount or the center driveshaft support. They're both pretty soft to start with, and as they wear eventually you get too much driveshaft movement and a thump-thump-thump on hard takeoff.

Tom

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1991 Spider
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post #5 of 6 (permalink) Old 06-16-2019, 01:58 AM
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Is the rubber doughnut between the prop shaft and the gearbox OK?

Daily drive is a Giulia 2.0 MA, wife drives a 939 Spider in the summer and a 1.6TS 147 in the winter. For special sunny days we have a S2 Spider Junior in the garage.
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post #6 of 6 (permalink) Old 06-16-2019, 03:52 AM Thread Starter
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Thanks guys. I'm going to order a rebuild kit from Centerline and have a local drive shaft shop repair it.
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