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Author Topic: Engine Vibration/Drumming.  (Read 5316 times)
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gengis
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« on: August 04, 2013, 10:56:27 PM »

The honeymoon period is over...now that I'm using my recently restored 2000ie more, I've noticed that there's a vibration/drumming that's getting transmitted through the floor/bulkhead...like the exhaust is touching the body.

This vibration only occurs whenever I come off throttle, especially at motorway speeds.  But is slightly noticeable at idle.  I was wondering if this is indicative of failing engine /gearbox mounts/dampers.  Any thoughts?
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Neil-yaj396
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1979 1300 Coupe 1983 2000ie Coupe


« Reply #1 on: August 05, 2013, 06:53:47 AM »

My car had a nasty vibration that I thought was exhaust related but it turned out to be just the heater intake flap and would stop if I closed the flap. Worth a try?
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rossocorsa
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« Reply #2 on: August 05, 2013, 09:28:27 AM »

of course with an Italian car you should never take your foot off the throttle  Cheesy but seriously it sounds like that engine is rocking and something is catching, it could be mountings or dampers or maybe just something loose, the exhaust can also suffer due to flexing 
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gengis
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« Reply #3 on: August 05, 2013, 10:23:58 PM »

Thanks for that lads...I'm pretty sure it's engine mounts/dampers, but how do you check which is failing?  The dampers are dry, and no visible signs of the front one deteriorating.  Does anyone have a diagram of all engine mounts/dampers?
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1983 - Lancia Beta Coupe
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2012 - Alfa Romeo Mito
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MattNoVAT
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« Reply #4 on: August 05, 2013, 10:51:23 PM »

The engine dampers are easy to take off, if they are seized solid then that's an obvious problem.  If they are seized then the vibration is transferred through the chassis.

It's worth doing a visual check on the condition the engine mounts, I've seen some dry and fatigued through old age and others soaked with oil so much that the rubber bonding has separated from the metal body of the mount.



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1981 2000 Coupe S2/FL
1976 1600 Coupe S1

Understeer is when you hit the wall with the front of the car. Oversteer is when you hit the wall with the back of the car. Horsepower is how fast you hit the wall and torque is how far you send the wall across the field once youve hit it.
gengis
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« Reply #5 on: August 06, 2013, 08:35:55 PM »

Thanks Mattnovat... That never crossed my mind, a seized damper.  That would give me the conditions I describe...I'll check that.
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1983 - Lancia Beta Coupe
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MattNoVAT
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« Reply #6 on: August 06, 2013, 10:31:02 PM »

It's only two bolts, per damper. Best if you pop each front wheel off to remove and check.


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1981 2000 Coupe S2/FL
1976 1600 Coupe S1

Understeer is when you hit the wall with the front of the car. Oversteer is when you hit the wall with the back of the car. Horsepower is how fast you hit the wall and torque is how far you send the wall across the field once youve hit it.
gengis
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« Reply #7 on: August 07, 2013, 05:22:44 PM »

I have taken the two dampers off...see pics.

They look in good condition, the rams are free of rust and go in/out with the expected resistance.  The bottom mount sleeve has more movement within it's rubber, but I think this is designed this way as the rubber is tapered towards the center. 

Next question...is the stroke correct?  I think it is..as the rams can be pulled out till a definite stop.  Can anyone confirm this?



* Lancia Dampers 1.jpg (67.03 KB, 640x480 - viewed 600 times.)

* Lancia Dampers 2.jpg (68.57 KB, 640x480 - viewed 694 times.)

* Lancia Dampers 3.jpg (61.26 KB, 640x480 - viewed 600 times.)
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1983 - Lancia Beta Coupe
1982 - Fiat 124 Spider
2012 - Alfa Romeo Mito
2011 - Fiat Fiorino
2006 - BMW F800st
MattNoVAT
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« Reply #8 on: August 07, 2013, 06:28:22 PM »

Yes, given the info you have provided the dampers are operating correctly.


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1981 2000 Coupe S2/FL
1976 1600 Coupe S1

Understeer is when you hit the wall with the front of the car. Oversteer is when you hit the wall with the back of the car. Horsepower is how fast you hit the wall and torque is how far you send the wall across the field once youve hit it.
WestonE
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« Reply #9 on: August 15, 2013, 07:22:47 AM »

Look at the engine mounts for them going soggy from oil (crank pulley one) or dry and splitting on the others. Also look under the car for touch and rub points from the exhaust as it should not be in contact with the shell except at the mounting points.

Eric
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gengis
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« Reply #10 on: September 02, 2013, 09:05:52 PM »

Found the source of the vibration...front engine mount.  Stripped it out the other night, and found that one of the metal mounting cheeks was no longer bonded on to the rubber insert, allowing the top plate to drum on the cross-member.  I have made up a temporary fix, until I find a suitable alternative.   

Photo of healthy mount...



* Lancia Beta Mount.jpg (19.82 KB, 400x267 - viewed 553 times.)
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1983 - Lancia Beta Coupe
1982 - Fiat 124 Spider
2012 - Alfa Romeo Mito
2011 - Fiat Fiorino
2006 - BMW F800st
glovebeast
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« Reply #11 on: September 02, 2013, 10:13:24 PM »

Bought one from http://www.oldlanciaspares.com/beta/motore.php (cav534) in March this year. They will sell individual mounts, cost me 100 euro with the postage
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gengis
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« Reply #12 on: September 04, 2013, 09:33:40 PM »

Thanks glovebeast, I may end up getting a new one.  I picked up a mount from the scrappies today, it's off a Renault Laguna, had to cut the rubber slightly to fit inside the crossmember.  Seems to be fine, but time will tell.

See photos...


* Front Engine Mount 008.jpg (93.97 KB, 640x480 - viewed 435 times.)

* Front Engine Mount 009.jpg (93.05 KB, 640x480 - viewed 548 times.)

* Front Engine Mount 001.jpg (94.84 KB, 640x480 - viewed 590 times.)

* Front Engine Mount 003.jpg (93.86 KB, 640x480 - viewed 533 times.)

* Front Engine Mount 006.jpg (81.83 KB, 640x480 - viewed 680 times.)
« Last Edit: September 04, 2013, 09:36:34 PM by gengis » Logged

1983 - Lancia Beta Coupe
1982 - Fiat 124 Spider
2012 - Alfa Romeo Mito
2011 - Fiat Fiorino
2006 - BMW F800st
WestonE
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« Reply #13 on: September 12, 2013, 06:26:13 AM »

Get a replacement from Mark W with only 2 bolts fixing you will crack the subframe in time.

Eric
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gengis
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« Reply #14 on: September 12, 2013, 08:38:54 PM »

Good point Eric...I will get a new mount.
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1983 - Lancia Beta Coupe
1982 - Fiat 124 Spider
2012 - Alfa Romeo Mito
2011 - Fiat Fiorino
2006 - BMW F800st
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