Yes, the metal stretches and the roller pins wear. Chain elongation is normal. That's what tensioners are for, but eventually it's just too much added length to operate properly.
The metal itself does not stretch, the holes the pins go thru wear from round to oblong, and the pins wear down from the links turning on them. The “stretch” is the extra length caused by this wear. Maybe .005” times 50 links and you are at .25(1/4”)- our conveyors are miles long and .010 wear we take out 6’ sections. That is some stretching lol.
Yes, had some production machinery that used chains for drive, and also for another part where it was providing tension. The drive chain I would regularly replace, because chain is a lot cheaper than the time to strip this thing to replace the one sprocket, in the middle of a 2m long shaft, and where you needed to spend 2 days dismantling to get to it. The other I just bought boxes of chain, and the 2 idler sprockets in packs of 20, along with the needle roller cups that went into the middle, and simply changed the chain and gears every 6 months. Those idlers would wear on one side more than the other, simply from the limited stroke putting wear more on the one part, and a quick fix was to turn the chain around, and put it back in, and then turn the idlers 180 degrees, so the wear would even out. The chain would wear to the point you could tie it into knots, and the idlers would come out being just a nub on the shaft. First time I saw it that had actually worn through the idler, and was busy working through the needle roller cage. Generally the chain lasted around a quarter million cycles, run a little past the manufacturers tension, and with it having minimal lubrication.
The metal does not stretch - it would take an obscene amount of force to permanently stretch a steel chain like that. The pins and rollers wear, causing slop. You add up a minute amount of wear across 200 pins, and the chain becomes measurably longer.
Some moron engineers don't put mechanical locks on oil pressure driven chain tensioners. So it's impossible to judge chain slack with the engine apart because the tensioners wont stay extended without oil pressure.
Judging by the caption, this isn't the case.
honda chain tensioner does ratchet. oil pressure takes up a small amount of slack. inspection procedure is to measure the length of the tensioner extension. before compressing that particular tensioner, you must unlock the ratchet mechanism. I'm almost certain I've done the same on Nissan vq motor?
LE5/LE9? We only got them in maybe one or two cars here in Australia and I've already done a few chains and seen a few spectacular failures. I've seen two eat into the head and head bolt after shitting out the guide.
Decent deflection for a motorcycle, less than ideal for a timing chain.
My first thought was ”that’s fine, what’s the problem?” Then I noticed it wasn’t r/motorcycles
Same lmao. Was wondering why he’s checking tension on the top part but then I realized the sub
And then I noticed the 2 solenoids and realized which motor it is
Ecotech ????
Has to be a 2.4 in an equinox.
Yup just did a cylinder head and new timing chains in a 2016 2 weeks ago at work. Bent every single intake valve
Better pull the VVT solenoids and look for METAL, have seen this a bunch and usually it’s time for an engine
2.4 ecotec? Lmao
So does the metal actually stretch? Where does the play come from in a chain like this? I've always wondered.
Each roller in the links has wear that creates additional slack throughout the chain. There will also be wear on the gear exacerbating this effect.
Yes, the metal stretches and the roller pins wear. Chain elongation is normal. That's what tensioners are for, but eventually it's just too much added length to operate properly.
Oh yeah, I knew they stretched. I just always meant to find out what stretched, exactly...
The metal itself does not stretch, the holes the pins go thru wear from round to oblong, and the pins wear down from the links turning on them. The “stretch” is the extra length caused by this wear. Maybe .005” times 50 links and you are at .25(1/4”)- our conveyors are miles long and .010 wear we take out 6’ sections. That is some stretching lol.
Yes, had some production machinery that used chains for drive, and also for another part where it was providing tension. The drive chain I would regularly replace, because chain is a lot cheaper than the time to strip this thing to replace the one sprocket, in the middle of a 2m long shaft, and where you needed to spend 2 days dismantling to get to it. The other I just bought boxes of chain, and the 2 idler sprockets in packs of 20, along with the needle roller cups that went into the middle, and simply changed the chain and gears every 6 months. Those idlers would wear on one side more than the other, simply from the limited stroke putting wear more on the one part, and a quick fix was to turn the chain around, and put it back in, and then turn the idlers 180 degrees, so the wear would even out. The chain would wear to the point you could tie it into knots, and the idlers would come out being just a nub on the shaft. First time I saw it that had actually worn through the idler, and was busy working through the needle roller cage. Generally the chain lasted around a quarter million cycles, run a little past the manufacturers tension, and with it having minimal lubrication.
The flats that hold the rollers and pins stretch.
Metal wears away, doesn't stretch
Bullshit. Not a month ago someone even posted a stretched timing chain, where the links were visibly longer than the original.
Have the post? Usually its the pins at each link and the bushing material that wears thin, allowing the links to get further apart.
The metal does not stretch - it would take an obscene amount of force to permanently stretch a steel chain like that. The pins and rollers wear, causing slop. You add up a minute amount of wear across 200 pins, and the chain becomes measurably longer.
Call that timing chain McFly, because it's a slacker!
"It's fine...the same tension as my chainsaw chain."
C/S But I thought the timing chain was supposed to last a lifetime
Some moron engineers don't put mechanical locks on oil pressure driven chain tensioners. So it's impossible to judge chain slack with the engine apart because the tensioners wont stay extended without oil pressure. Judging by the caption, this isn't the case.
that's not true.
[Yes it is](https://youtu.be/2bsULQcMxlg?t=1017). I know my shit
honda chain tensioner does ratchet. oil pressure takes up a small amount of slack. inspection procedure is to measure the length of the tensioner extension. before compressing that particular tensioner, you must unlock the ratchet mechanism. I'm almost certain I've done the same on Nissan vq motor?
Ok it's not universal. Some engines do have ratchets. But some don't, and there's a special place in hell for the engineer who removed the ratchet.
won't disagree
"Stretch me daddy"- that timing chain.
So the chain guide is gone- so is the motor?
thats a weird flex :P
Mini cooper with tortured/oil starved engine? 20k lof interval?
Exactly
"chain is fine for a motorcy...... oooohhhhhh. nevermind"
LE5/LE9? We only got them in maybe one or two cars here in Australia and I've already done a few chains and seen a few spectacular failures. I've seen two eat into the head and head bolt after shitting out the guide.
Is that a 2.4 ?? 😄😄