Differential Clunk - Page 3 - Alfa Romeo Bulletin Board & Forums
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post #31 of 41 (permalink) Old 05-13-2019, 06:05 AM Thread Starter
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Quote:
Originally Posted by Gubi View Post
Don't Mess With It
Agree

Vin

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post #32 of 41 (permalink) Old 05-13-2019, 06:08 AM Thread Starter
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Ok any movement fore/aft in the pinion? ( I doubt there is but just finishing the Dx)
Ran out of time last night.

I will do it when I get home from work and just think about it all day

Vin

1991 Spider Veloce - Red on Tan - Rosa Bionda
1987 Spider Quadrifoglio - Red on Grey - Rosa - Sold
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post #33 of 41 (permalink) Old 05-13-2019, 07:37 AM
But Mad North-Northwest
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While you're down there, grab the shafts on both sides of each u-joint and try to turn in opposite directions. You're looking for play in the u-joint. Any play and you've got an issue.

Also check for play in the splines while you're at it.

Tom

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1974 GTV
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post #34 of 41 (permalink) Old 05-13-2019, 07:59 AM Thread Starter
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Quote:
Originally Posted by Gubi View Post
While you're down there, grab the shafts on both sides of each u-joint and try to turn in opposite directions. You're looking for play in the u-joint. Any play and you've got an issue.

Also check for play in the splines while you're at it.
I replaced the U joints and centre support in May of 2014, so under 10K miles ago, but of course I will check.

It's interesting you mention the splines. This area right?
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I say interesting because I was talking to mcola over the weekend and we talked about greasing the driveshaft. I don't think I had done that last year, so I went under and greased it.

Went for a drive and while the clunk is still there, it doesnt happen as much.

What are you thinking about when it comes to the splines and clunks?

Vin

1991 Spider Veloce - Red on Tan - Rosa Bionda
1987 Spider Quadrifoglio - Red on Grey - Rosa - Sold
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post #35 of 41 (permalink) Old 05-13-2019, 09:00 AM
But Mad North-Northwest
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Yeah, that section. Play anywhere can cause noise. If the splines are worn (perhaps because of lack of grease) they can clunk, so check there for play as well.

That knurled cap is (I think) supposed to only be hand tight, but I had a tiny bit of play in my splines that went away when I tightened it up a bit more. No idea if this was the right thing to do or not.

Tom

1963 Giulia Spider (1750 engine)
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post #36 of 41 (permalink) Old 05-13-2019, 01:39 PM
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if the splined shaft is too worn (0,2mm max play is the spec., at least for 1600/1750 it is, can't see why the 2000 would be any different) there is not much you can do, but buy a new rear prop section for 250 bucks.

the knurled nut just needs hand tight, but I do a tiny bit more with vise grips as you can't really get a good grip with your hands all covered in grease!

In fact its worth undoing it when greasing to make sure the grease is going in properly and is not all dried grease.

That sliding joint requires greasing every 4k

Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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post #37 of 41 (permalink) Old 05-13-2019, 02:48 PM Thread Starter
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Ok,

The differential input flange is solid. No fore/aft movement.

All the u joints are tight, no movement.

No movement in the splined section. The knurled nut could be turned by hand about 1 rotation. I totally loosened the knurled nut and put in more grease, tightened the knurled nut by hand and then a quarter turn or so with pliers to get it good and tight.

I will take her out for spin and report back.

Vin

1991 Spider Veloce - Red on Tan - Rosa Bionda
1987 Spider Quadrifoglio - Red on Grey - Rosa - Sold
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post #38 of 41 (permalink) Old 05-13-2019, 04:25 PM Thread Starter
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Well.........what can I say?

Took her out and did my best to make the clunk but I couldn't.

The only thing I can say I did was loosen the knurled nut and put in more grease, then tightened the knurled nut as described. Tighten by hand and a quarter turn or more with pliers.

I am thrilled that the clunk is gone but just can't believe that the grease and nut was all it took.

Want to thank everyone for contributing and teaching me a few new things.

Sincerely,

Vin
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1987 Spider Quadrifoglio - Red on Grey - Rosa - Sold
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post #39 of 41 (permalink) Old 05-13-2019, 04:47 PM
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FWIW this jogged my memory about the same on my 69 Spider. I had a noise of some sort (can't recall if it was "the clunk" like yours) and did the same with lube & tighten the knurled nut and solved whatever it was. So seems it is not uncommon.

Glad it was simple.

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post #40 of 41 (permalink) Old 05-14-2019, 01:50 AM
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I am thrilled that the clunk is gone but just can't believe that the grease and nut was all it took.
I'm gonna get under mine now

I do think the trick is to undo the knurled nut completely when greasing.

But sure glad for you Vin, that it was one of the cheap fixes!

.....though, if I'm honest, I was getting all ready for one of your great teardown threads with photos

Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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post #41 of 41 (permalink) Old 05-14-2019, 06:36 AM Thread Starter
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I'm gonna get under mine now

I do think the trick is to undo the knurled nut completely when greasing.

But sure glad for you Vin, that it was one of the cheap fixes!

.....though, if I'm honest, I was getting all ready for one of your great teardown threads with photos
I'm glad it was a cheap fix as well.

If I'm honest, I was getting all ready to that teardown thread with photos as well!

I might just do one to replace the friction disks in the differential.

Thanks again,

Vin

1991 Spider Veloce - Red on Tan - Rosa Bionda
1987 Spider Quadrifoglio - Red on Grey - Rosa - Sold
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