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Timing chain stretch #4448330
07/03/17 11:54 AM
07/03/17 11:54 AM
Joined: Jun 2003
Posts: 5,949
Illinois
SHOZ Offline OP
SHOZ  Offline OP
Joined: Jun 2003
Posts: 5,949
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.



2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Timing chain stretch [Re: SHOZ] #4448336
07/03/17 12:05 PM
07/03/17 12:05 PM
Joined: Mar 2016
Posts: 1,556
Toronto
PeterPolyol Online content
PeterPolyol  Online Content
Joined: Mar 2016
Posts: 1,556
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.


Scambling for solutions is a hopelessly futile endeavour and potentially dangerous, without first coming to a solid, personal understanding of the problem. Beware riding the ideological hobby horse.
Re: Timing chain stretch [Re: SHOZ] #4448343
07/03/17 12:13 PM
07/03/17 12:13 PM
Joined: Dec 2006
Posts: 1,785
NY, NY
NYEngineer Offline
NYEngineer  Offline
Joined: Dec 2006
Posts: 1,785
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.

Re: Timing chain stretch [Re: PeterPolyol] #4448364
07/03/17 12:37 PM
07/03/17 12:37 PM
Joined: Jun 2003
Posts: 5,949
Illinois
SHOZ Offline OP
SHOZ  Offline OP
Joined: Jun 2003
Posts: 5,949
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.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Timing chain stretch [Re: SHOZ] #4448423
07/03/17 02:01 PM
07/03/17 02:01 PM
Joined: Mar 2016
Posts: 1,556
Toronto
PeterPolyol Online content
PeterPolyol  Online Content
Joined: Mar 2016
Posts: 1,556
Toronto
Wow. Did those engines with valve damage set a code for timing like P0011, P0014 etc?


Scambling for solutions is a hopelessly futile endeavour and potentially dangerous, without first coming to a solid, personal understanding of the problem. Beware riding the ideological hobby horse.
Re: Timing chain stretch [Re: SHOZ] #4448460
07/03/17 02:50 PM
07/03/17 02:50 PM
Joined: Mar 2004
Posts: 21,105
Upstate NY
Donald Online content
Donald  Online Content
Joined: Mar 2004
Posts: 21,105
Upstate NY
Back to the old small block GM V8 engine with a simple chain path. Never any timing chain issues on those engines.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Timing chain stretch [Re: SHOZ] #4448649
07/03/17 06:01 PM
07/03/17 06:01 PM
Joined: Aug 2003
Posts: 11,012
Buffalo, NY
JTK Offline
JTK  Offline
Joined: Aug 2003
Posts: 11,012
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.


2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)
Re: Timing chain stretch [Re: SHOZ] #4448721
07/03/17 06:56 PM
07/03/17 06:56 PM
Joined: Mar 2012
Posts: 2
australia
kris42 Offline
kris42  Offline
Joined: Mar 2012
Posts: 2
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.

Re: Timing chain stretch [Re: JTK] #4448757
07/03/17 07:29 PM
07/03/17 07:29 PM
Joined: Mar 2016
Posts: 1,556
Toronto
PeterPolyol Online content
PeterPolyol  Online Content
Joined: Mar 2016
Posts: 1,556
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.


Scambling for solutions is a hopelessly futile endeavour and potentially dangerous, without first coming to a solid, personal understanding of the problem. Beware riding the ideological hobby horse.
Re: Timing chain stretch [Re: SHOZ] #4448906
07/03/17 09:56 PM
07/03/17 09:56 PM
Joined: Jul 2003
Posts: 4,893
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,893
New Zealand
A morse chain will ride high on the sprocket teeth when worn. That looks pretty good.


1987 BMW R65 - Aegis SAE30
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Timing chain stretch [Re: kris42] #4448983
07/03/17 11:55 PM
07/03/17 11:55 PM
Joined: Aug 2008
Posts: 2,181
Cali
Malo83 Offline
Malo83  Offline
Joined: Aug 2008
Posts: 2,181
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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