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  #16 (permalink)  
Old 08-06-2008, 12:27 PM
Dan T Dan T is offline
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engine vibration question

Well, my Alfa is up and running, and I still have some nice weather to enjoy it!!! Thanks to everyone that helped with their advice.

The car is running well, but there seems to be a slight engine vibration. Does anyone have any suggestions as to where to start looking for the cause?

Also, I am going to flush the gearbox and differential, and was wondering if there is anything special about the Gear Lube I should use to refill? My manual says SAE 80 S/90 API GL 5, which is standard Gear lube. Is that correct, or are there any additives used?

Thanks as always for your help!

Dan
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  #17 (permalink)  
Old 08-06-2008, 12:56 PM
ghnl ghnl is offline
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Shell Spirax is supposed to the stuff the gearbox was designed to use. But that may be hard to find (and the formula may have changed anyway...).

I have read good reports from those that use a RedLine product. I don't recall the exact one off hand however. And I think different (RedLine) lubes are used in the gearbox & differential.

Re: vibrations. Check the motor mounts, transmission mount, rubber driveshaft donut, etc. How are the fan blades? If the fan is old & yellowed there is a risk of the fan loosing a blade. That will throw it off balance and a flying fan blade can cause lots of damage.

How about the tires? Check for lumps/bumps in both the tread and inner/outer sidewalls. That could indicate a broken cord.
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- Eric
don't read this!
- 1984 Spider Veloce -
~ North Carolina, USA ~

L-jetronic Spider diagnosis (1982-1989)
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  #18 (permalink)  
Old 08-06-2008, 01:46 PM
Dan T Dan T is offline
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Posts: 27
engine vibration question

Hi Eric,

Thanks for your help! I am planning on changing the motor mounts, and will check the transmission mount and donut as well. Also have new tires on my list, so that shouldn't be a problem. The fan looks ok.

Just thought of something else... I can hear the fuel pump (kind of a high pitched buzz) when driving the car, and I replaced them both. Are some noisier than others, and is there any way to quiet it down?

Best,
Dan
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  #19 (permalink)  
Old 08-06-2008, 02:29 PM
ghnl ghnl is offline
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Is the main fuel pump (under the car) mounted through rubber bushes? If it is solidly mounted that would likely transmit a lot of noise into the cabin. With the engine running I don't hear the pump(s).
__________________
- Eric
don't read this!
- 1984 Spider Veloce -
~ North Carolina, USA ~

L-jetronic Spider diagnosis (1982-1989)
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