Author Topic: timing chain wobble  (Read 396 times)

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LoGiTo

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timing chain wobble
« on: August 03, 2020, 05:51:32 PM »
Hi there,

I have taken apart the oil filter side of the engine, and I think the timing chain is very loose.
Please correct me on this, should the chain have any play at all?

I've attached a link of a video, so you can see what's going on.
https://www.youtube.com/watch?v=QyW6Lz2WKJU

Furthermore, can this play of the chain cause my timing to be off, and misalign itself after I set it up?

Thank you in advance.


Guldbergdk

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Re: timing chain wobble
« Reply #1 on: August 03, 2020, 08:16:04 PM »
I wouldnt suspect a little slack to do any difference. It would mean a minute change in the opening/closing of the valves, but since there is a good deal of time the valverods are not being engage by the cam, I doubt it would mean much. Somebody with more knowledge might know better.

If you talk about timing of cylinder ignition you might have to readjust this after.

ChrisRLewis

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Re: timing chain wobble
« Reply #2 on: August 03, 2020, 09:39:51 PM »
Looks very slack and I would have no hesitation to replace the chain, just in case the worse happens.

Njkip

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Re: timing chain wobble
« Reply #3 on: August 03, 2020, 10:52:58 PM »
Just for my own info......I take it there is no timing chain adjuster/tensioner on the fiat 126 bis....and when it's becomes stretched it's a case of replacement?

andyzeetec

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Re: timing chain wobble
« Reply #4 on: August 04, 2020, 01:02:48 PM »
I checked mine recently using this mechanics method. Basically "If it takes more than 7degrees of crankshaft rotation before the distributor shaft moves or rotates, you have excessive timing chain slack" 

It's much like the backlash on a lathe cross slide.

https://youtu.be/4_f5ukZVri8

I'm no expert but I would go with Chris, replace it.




« Last Edit: August 04, 2020, 10:22:50 PM by andyzeetec »

LoGiTo

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Re: timing chain wobble
« Reply #5 on: August 04, 2020, 02:25:24 PM »
Hi.

Thank you all for your answers.

It definitely takes more effort on mine to move the distributor shaft, somewhere around 10 degrees.

I've ordered a replacement part so I'm hoping that changing it will fix the issues.


ChrisRLewis

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Re: timing chain wobble
« Reply #6 on: August 04, 2020, 04:08:26 PM »
To do the job properly you also need to renew the drive gears when fitting a new timing chain.

andyzeetec

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Re: timing chain wobble
« Reply #7 on: August 04, 2020, 04:35:33 PM »
Any idea what sort of job it is to fit the whole kit including sprockets and shaft seals. Full or partial strip down?

https://webshop.fiat500126.com/en/engine-parts-und-gaskets/timing/timing-chain-gear-set-including-shaft-seals-und-gaskets

Guldbergdk

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Re: timing chain wobble
« Reply #8 on: August 04, 2020, 09:55:19 PM »
Pretty easy since you have youto  undo the sprockets anyway to get the chain off. Would be a waste not to do it if you change the chain anyway

andyzeetec

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Re: timing chain wobble
« Reply #9 on: August 05, 2020, 12:43:25 PM »
I've changed the link which was dead in a previous post; this is on how to check for timing chain slack. Here it is again..   https://youtu.be/4_f5ukZVri8


Not using the previous method but worth noting...When the cover is off its quite easy to miss seeing the slack if the crank isn't turned and checked, as you get tight and loose spots, so may have a series of stretched links or frozen links that are making the chain tighten and loose.

thanks.
« Last Edit: August 05, 2020, 05:11:37 PM by andyzeetec »

 

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