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#4448330 - 07/03/17 12:54 PM Timing chain stretch
SHOZ Offline


Registered: 06/28/03
Posts: 5746
Loc: Illinois
How much is too much? Is there some value based on the link length?

Here's my Gen Coupe that is know for chain stretch.



This is another car but shows the whole chain system.

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2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual

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#4448336 - 07/03/17 01:05 PM Re: Timing chain stretch [Re: SHOZ]
PeterPolyol Offline


Registered: 03/06/16
Posts: 1345
Loc: toronto
What are the specs on deflection? Timing chains are really troublesome these days, regardless of brand but if you don't have any weird noises or timing codes, no need to worry.

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#4448343 - 07/03/17 01:13 PM Re: Timing chain stretch [Re: SHOZ]
NYEngineer Offline


Registered: 12/12/06
Posts: 1570
Loc: NY, NY
I had a 1998 Yukon that around 230,000 miles would stumble under hard acceleration and throw a code that worked out to be Random Misfire. This was pre LS engines so it had a distributor driven off the cam. I swapped in a new Cloyes chain and gears and that was the end of that. Truck ran silky smooth again. It was the sloppy stretched out chain causing the distributor to bounce.
Those older Chevy engines did not have any chain tensioners. I'd imagine your engine is a little more forgiving.

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#4448364 - 07/03/17 01:37 PM Re: Timing chain stretch [Re: PeterPolyol]
SHOZ Offline


Registered: 06/28/03
Posts: 5746
Loc: Illinois
Originally Posted By: PeterPolyol
What are the specs on deflection? Timing chains are really troublesome these days, regardless of brand but if you don't have any weird noises or timing codes, no need to worry.
I can't find any in the manual. And some early engines (like mine) have had valve damage from too much slack in the original chain.
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2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual

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#4448423 - 07/03/17 03:01 PM Re: Timing chain stretch [Re: SHOZ]
PeterPolyol Offline


Registered: 03/06/16
Posts: 1345
Loc: toronto
Wow. Did those engines with valve damage set a code for timing like P0011, P0014 etc?

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#4448460 - 07/03/17 03:50 PM Re: Timing chain stretch [Re: SHOZ]
Donald Offline


Registered: 03/21/04
Posts: 20456
Loc: Upstate NY
Back to the old small block GM V8 engine with a simple chain path. Never any timing chain issues on those engines.
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#4448649 - 07/03/17 07:01 PM Re: Timing chain stretch [Re: SHOZ]
JTK Online   content


Registered: 08/14/03
Posts: 10580
Loc: Buffalo, NY
Don't most have hydraulic tensioners that tension the chain up once the engine is running? Some slack with the engine off is meaningless then.
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#4448721 - 07/03/17 07:56 PM Re: Timing chain stretch [Re: SHOZ]
kris42 Offline


Registered: 03/12/12
Posts: 2
Loc: australia
I think a lot of the problem is modern oils, I use a high Zinc level oil to help stop pin and bush wear.

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#4448757 - 07/03/17 08:29 PM Re: Timing chain stretch [Re: JTK]
PeterPolyol Offline


Registered: 03/06/16
Posts: 1345
Loc: toronto
These things have a ratcheting mechanism in them. The oil pressure just keeps positive tension on the chain to enable the ratcheting action as chain stretches over it's life span and also dampen sub-ratchet-incremental? slack, that is the slack that exists in between ratchet locks that isn't enough to engage the next 'click'. Sometimes the ratchet mechanism fails, sometimes guide wear and chain stretch max the tensioner out.

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#4448906 - 07/03/17 10:56 PM Re: Timing chain stretch [Re: SHOZ]
Silk Offline


Registered: 07/26/03
Posts: 4560
Loc: New Zealand
A morse chain will ride high on the sprocket teeth when worn. That looks pretty good.
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1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
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#4448983 - 07/04/17 12:55 AM Re: Timing chain stretch [Re: kris42]
Malo83 Online   content


Registered: 08/08/08
Posts: 2000
Loc: Cali
Originally Posted By: kris42
I think a lot of the problem is modern oils, I use a high Zinc level oil to help stop pin and bush wear.

Not the oil but the longer oil change intervales, annual oil changes?, no thanks bop

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