GM 3.5 timing chain too loose? (see video)

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GM 3.5 timing chain too loose? (see video)

Postby dryvr12 » Wed May 17, 2017 7:43 pm

I picked up a replacement engine for an 06 g6 3.5 that I am going to flip. I have posted on the pontiac forum, but there isn't much activity. Do you think this is too loose? Engine supposedly has 52k miles.

https://www.youtube.com/watch?v=y3kMS1d ... e=youtu.be
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Re: GM 3.5 timing chain too loose? (see video)

Postby Von » Thu May 18, 2017 8:54 am

Nah, I'd run that.
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Re: GM 3.5 timing chain too loose? (see video)

Postby Ed Mc. » Thu May 18, 2017 3:02 pm

Doesn't look that bad. Main thing is how much rotational slop does it have, i.e. if you turn the crankshaft, how many degrees does it turn before the cam turns. If minimal, then it's OK. My old 2.8 Trooper had at least degrees of slop with over 150,000 miles on it. It retarded the cam timing and had really good top end but never made any chain noise. It had almost 170,000 on it when I sold it and still ran good with the sloppy chain & didn't make any noise.

But one thing to consider, I would change the timing damper since the rubber shoes get hard then crack/fall off. After that the chain is metal-on-metal until it breaks. Check the shoes, if they're soft & pliable probably OK. But if hard as a rock, change it. The damper is cheap.

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Re: GM 3.5 timing chain too loose? (see video)

Postby dryvr12 » Thu May 18, 2017 9:04 pm

Thanks, will check rotational slop and the condition of the damper.
Zack
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1988 Trooper LS 2.6L Auto to manual swap, Asin hubs, 228k+
http://forum.planetisuzoo.com/viewtopic.php?f=15&t=50707
LED gauges, sony h/u, alpine speakers, jl audio w3's, grant steering wheel, cup holders, procomp 98s

Odometer correction: http://forum.planetisuzoo.com/viewtopic.php?f=1&t=67546
Dome light fix: http://forum.planetisuzoo.com/viewtopic.php?f=17&t=62898
LEDs:http://forum.planetisuzoo.com/viewtopic.php?f=1&t=51643
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Re: GM 3.5 timing chain too loose? (see video)

Postby Hawaiian Whore » Thu May 25, 2017 8:23 am

as a GM enthusiast, I can tell you that they have issues with their timing chains on pretty much all of their platforms. I replace mine every 50K miles. It's not hard to do and will save you headaches in the long run. As for flipping it, if you tore it down to inspect it, I imagine that you heard some chatter from it?
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Re: GM 3.5 timing chain too loose? (see video)

Postby dryvr12 » Fri May 26, 2017 12:13 pm

Hawaiian Whore wrote:as a GM enthusiast, I can tell you that they have issues with their timing chains on pretty much all of their platforms. I replace mine every 50K miles. It's not hard to do and will save you headaches in the long run. As for flipping it, if you tore it down to inspect it, I imagine that you heard some chatter from it?


I have heard it's a good idea to replace them at around 100k. If I were keeping it I would put a new chain on along with a few other things. I have never heard this engine run. I bought the car from a friend as he ran the old engine out of oil and it was knocking. I picked this one up from a junkyard
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1988 Trooper LS 2.6L Auto to manual swap, Asin hubs, 228k+
http://forum.planetisuzoo.com/viewtopic.php?f=15&t=50707
LED gauges, sony h/u, alpine speakers, jl audio w3's, grant steering wheel, cup holders, procomp 98s

Odometer correction: http://forum.planetisuzoo.com/viewtopic.php?f=1&t=67546
Dome light fix: http://forum.planetisuzoo.com/viewtopic.php?f=17&t=62898
LEDs:http://forum.planetisuzoo.com/viewtopic.php?f=1&t=51643
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Re: GM 3.5 timing chain too loose? (see video)

Postby Hawaiian Whore » Fri May 26, 2017 12:58 pm

that's on you then. the tensioners on these cars have been updated at least 3 times in the past 5 years because they all kept having issues. I'd for sure at least replace that...
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