Club126UK
Fiat 126 Chat => Fiat 126 Mechanical Problem Solving => Topic started by: magnumpi on January 10, 2014, 05:35:09 PM
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Hi all
I own a 126 Bis and i have changed the gearbox mounts and the engine mount.
But i still get this serious vibration/droning noise threw the body at around 1800 2500rpm :o it is really bad
is there anyone who has come across this?
Thanks
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Hi Welcome to the forum :)
I asume you mean that the car is in motion so does pushing in the clutch & coasting make any difference?
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Hello thank you for reply the vibration is there even when is idling the engine was removed before xmas and a new timing chain and head gasket fitted the vibration was there then. we changed the engine mount but found it got worse so fitted the old spring back on all this before engine was removed but today fitted the engine and OMG!! The vibration is shocking even on idle with the doors open you can see them shaking up and down :headscratch:
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Have you checked the engine timing,(ignition timing also) fairly idiot proof and as you have just done it you may recall the ease of the job, or the choke, could the engine be "hunting". Mike.
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Hello yes the timing is good it's almost like the sound of an exhaust touching a car chassis but i ain't kidding a 100 times worse big drone and vibration at the same time.
Thank you for taking the time to help me with this :)
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Did the engine vibrate before you replaced the timing chain and head gasket? also did you remove the flywheel?
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Yes vibration was there before we did the work. the flywheel was removed as had really bad oil leak behind it.
The flywheel never had like a groove so you could only fit one way and we checked to see if there was like any of set holes but none you could bolt it on at whatever angle.
Thank you
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If a flywheel has been removed from a Bis you must mark the original position on the crankshaft as the flywheel works in conjuction with the crankshaft pulley to balance the engine. Otherwise you are playing Russian Roulette with the engine with a 1 in 6 six chance of getting the flywheel back in the right place.
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Soooo what your saying is i'm screwed? :cry:
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There is a big possibility that the flywheel is in the wrong position :cry: which would UN-balance the engine and cause severe vibration :( Before you go any further check the alternator is not faulty by removing the fan belt and start the engine, see if the vibration stops, if it still the same you may have to take the engine out to check the flywheel, With the front pulley set at TDC the 4 holes should be at the top facing the cylinder head ;)
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Thank you pete126 i really appreciate you taking the time to help me with this problem i will take the alternator belt of in the morning and see but my guess is it's all going to have to come out again :-
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Don't worry allot of bis owners have been there, me included ;D If you get stuck give us a shout :)
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Can i do all this by removing the gearbox pete and just follow the instructions you have given me and put the flywheel back where it should be?
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You can do it that way, But i find it easier to pull the engine out
PS don't forget to check the alternator first :thumbup
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well you are not alone , I removed my engine on my bis this week to replace seals , check clutch etc. I took the flywheel off, when I went to refit I did have the presence of mind to think , hey this must go on a certain way due to the four big holes drilled out of it on one side, having stripped one engine down completely in the past I knew the big end has a massive weight on it so I knew this must mean it should go on in one way only. straight away I knew I should have marked the position when I removed it !! doh
but using the search on here for previous posts I found this thread , it has answered my question , thanks for the help guys.
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Is this a common issue? the bis i picked up this weekend has this same vibration issue and i know its had the engine out in the past. Is it an easy thing to check the flywheel position? has anyone got any pictures that could help me reset the flywheel. Its my first fiat 126 please be gentle with me
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There you go :D
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Ive also done the classic flywheel thing, then removed it all again engaged brain and corrected it, also you get a drone if the rear engine mount is too tight, it stops the spring absorbing the rattle and transfers it to the body, one to check, good luck, it is worth it when there sorted
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much appreciated thank you
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ok engine is out, its on my garage, what does the TDC mark look like? and should it be pointing at the timing mark/teeth or towards the top of the engine?
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If i put the mark from the front pulley on what i think is TDC (please correct me if im wrong) the flywheel holes arn't the fully up position matching the pistons. Im again assuming all the holes will be at the end where the piston is and up at TDC. Im just double checking as i don't want to put it back in the bay to find ive done it wrong though to me it looks to be in the wrong place on my car?
(http://i58.photobucket.com/albums/g278/adey1984/flywheel_zpsrkfn1e7f.jpg)
(http://i58.photobucket.com/albums/g278/adey1984/TDC_zpshrlu2hnk.jpg)
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The best way to make sure your flywheel is on the right way is to have it lined up so that the four holes are exactly at opersite ends to the big weight on the crank shaft - so when the pistons are at tdc the four holes should be at the cylinder head end. Also if you look at the flywheel you'll see a dot inprinted in it. That should be at the cylinder head end as well.
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The front pulley mark is at 10' BTDC - 2 notches to the right is TDC
Can't really tell if the flywheel is in the correct position as the photo does not show the the top of the engine, do you have a photo of the flywheel and head looking straight on?
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I will get fresh pictures up soon. But it was wrong from what i can tell. The top/cylinder head would be on the left of my flywheel picture.
I have now put the pistons at tdc, the front pulley mark lines up with the strobe teeth. I then removed the flywheel and put it so the 4 holes are closest to the cylinder head. Hopefully that is it and the crazy vibration is sorted.
Thanks for the help everyone, really appreciate it. Very surprised how easy it was to get the whole lot out too. Tomorrow mornings job is a refit of the engine.
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thanks again for all help with my issue guys. back in and not shaking anywhere like it was. will set the timing and give it a quick service today and hopefully start enjoying it