2000 RPM vibration - Page 3 - Alfa Romeo Bulletin Board & Forums
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post #31 of 37 (permalink) Old 04-08-2019, 02:13 AM
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Did this vibration only occur after you changed the engine/tranny mounts, or did you change the mounts because of this vibration?

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Originally Posted by Alfara View Post
I ask my wife to maintain the rpm between 2000 and 2500 rpm while I was looking under the car for the source of the vibrations...
But you said the vibration only occurs when the car is moving?

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After a few seconds, for him, there is clearly a adjustment of the valve clearance to be done; according to him, this could be the source of these vibrations (transmitted by the exhaust line).

What do you think of that?
not a lot, tbh

(though it is worth checking your valve clearances anyway, you do not want a burnt valve!)

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 #32 of 37 (permalink) Old 04-08-2019, 04:32 AM
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Quote:
Originally Posted by spiderserie4 View Post
Did this vibration only occur after you changed the engine/tranny mounts, or did you change the mounts because of this vibration?


But you said the vibration only occurs when the car is moving?


not a lot, tbh

(though it is worth checking your valve clearances anyway, you do not want a burnt valve!)
In order :

Only after the change of the mounts ; By the way, I have also change the 1-4 exhaust manifold and all the exhaust line.

Previously, I thought it only happened when the car was in motion, but during the tests, I discovered that it also happened when the car was stationary and neutral.

I'll check it (the valve clearances...) anyway but I am also not sure that it is the source of the vibration.

thanks for your help !

Last edited by Alfara; 04-08-2019 at 05:42 AM.
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post #33 of 37 (permalink) Old 04-08-2019, 08:38 AM
Richard Jemison
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Vibration

Valve clearances will NOT cause a vibration unless one is less than "0". (causing a miss)

Commonly suspect the trans mount, or balance issue with new clutch parts. or U-joint alignment/phasing if it`s when driving.

Richard Jemison
RJR Racing

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post #34 of 37 (permalink) Old 04-08-2019, 02:18 PM
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Let it all hang lose

I had a vibration problem with my 2600 spider after I replaced the Guibo .

I think I got something out of line. So I loosened all the nuts to finger tight - then with one wheel jacked up ran the car in gear at idle , till everything had rattled it self into line . Then tightened everything up and hey presto no vibrations
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post #35 of 37 (permalink) Old 04-08-2019, 04:04 PM
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If the vibration is present when the tranny is in neutral and the car is stationary then it is not driveshaft related . Also, driveshaft problems will cause vibrations at certain road speeds rather than at certain rpm's unless the car is a GTV6 or Milano.

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post #36 of 37 (permalink) Old 04-09-2019, 10:14 AM
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Quote:
Originally Posted by Redmerlin View Post
I had a vibration problem with my 2600 spider after I replaced the Guibo .

I think I got something out of line. So I loosened all the nuts to finger tight - then with one wheel jacked up ran the car in gear at idle , till everything had rattled it self into line . Then tightened everything up and hey presto no vibrations
That's exactly what I was planning to do: check all the tightening, loosen and tighten everything I can that can be linked to this vibration.

After a discussion with my friend, we also came to this conclusion.

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If the vibration is present when the tranny is in neutral and the car is stationary then it is not driveshaft related . Also, driveshaft problems will cause vibrations at certain road speeds rather than at certain rpm's unless the car is a GTV6 or Milano.
I totally agree with you, same analysis.


Thanks guys, as usual, I'll keep you informed !
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post #37 of 37 (permalink) Old 04-22-2019, 12:15 PM
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Redmerlin, your method works !

It was simply my engine mount nuts that were not tight enough (I'm always afraid of crushing the Grower washers too much).

Since the tightening, no more vibrations

Thanks everybody !
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