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Discussion Starter #1
The chain rattle is getting much worse over the last few months. As I'd like to keep my car for a few more years I thought I would be proactive in this repair. Purchased new in 2010 it has 142K miles.

I live in Raleigh, NC and am looking for a shop that has (successful) experience with this job on this car. I've worked with Creech Import before and they are fine. They quoted me a price of 2,200 using a mix of OEM/off-brand. I have quotes from two other shops - 1,850 - 2,800 same OEM/off-brand mix. Southern States Hyundai was much more expensive.

Any help and advice is appreciated.

Haigmeister
 

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2010 GC 3.8 Track 6MT
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132 Posts
Harvey, I'm not far from you being over in High Point. Our 2010 3.8 also has a bad TC rattle on a cold start. What did you ever do about your TC rattle?

Since this is a thread about the 2010 3.8 timing chain, let me post my concern here. We have a 2010 with just over 129k miles. On a cold start up, the timing chain rattles... and has gotten progressively worse where it will rattle for a couple seconds after start up. I don't notice it when the engine is warm. But that cold start rattle is getting to the point where I think it's time to deal with it.

So I called my local indie shop and got an estimate for the job... about $2500. Yikes. Since we also have the famous 5th gear scrape, I thought maybe we should change out the trans gear lube and see if there's much metal debris indicating a possible tranny rebuild too. During the lube change, no abnormal metal was noted, so I thought we would go ahead with the timing chain repair (and assorted components).

When the shop called to order all the parts, we found out that Hyundai had updated the parts and they would not bolt onto the stock camshaft... and new camshafts and assorted parts were now needed in addition to the timing chain. So now the bill is approaching $4000 for all this.

We backed off the repair and are meditating on our choices... to include selling the GenCoupe and moving to another vehicle.

This is my son's car and he's getting ready to head away to school to start his junior year in college and I'm not excited about the possibility of the worn chain guides/whatever letting loose and stranding him as well as trashing the engine.

What have you guys seen in regards to that timing chain rattle and the potential for trashing the engine? Should we just let it go to failure? (I'm generally not inclined that way, but the interior is in great shape and the engine is otherwise in good shape). The only other issue is the trunk water leak I have NOT been able to solve.

So with the timing chain rattle, the 5th gear scrape, and the trunk leak.... I'm sorta not happy about putting a bunch of money in this car which is still gonna leave the last 2 items unsolved.
 

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I'd rather do it myself
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18,556 Posts
Have you tried a different trans fluid? I had great luck with AC Delco syncromesh and Ceratec additive. And if the leak is the tail lights some black tape will fix that.
 

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Should have looked at the owners manual before buying the car.

IIRC, is says to have major service done at 100,000 miles, such as the timing chain.

$2500 for a timing chain job, and then another $1500 for their mistake? Yikes. Doesn't sound right to me.
$2500 is on the high side of a timing chain job, but not unheard of (depending)

All the 3.8 hyundai/genesis/kia Tau engines, use pretty much the same timing chain AFAIK. So they either, ordered parts for a completely different engine, or they are trying to drain you.
I would have asked to be shown how it doesn't fit.

As for the transmissions, try bleeding the clutch. With almost 150k miles on it, if bleeding it doesn't fit it, then likely the throwout bearing/clutch slave will need to be replaced (They are 1 part)
 

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2010 GC 3.8 Track 6MT
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132 Posts
Have you tried a different trans fluid? I had great luck with AC Delco syncromesh and Ceratec additive. And if the leak is the tail lights some black tape will fix that.
I've been dealing with this leak for about 3 years. I fixed the initial leak around the left rear tail light. But the leak I haven't been able to track down is coming from overhead in the trunk. I've posted about it (with pics) several places here. I've even had the rear glass pulled to look for issues (none noted by the shop that pulled the glass).

Hmm. Just had the trans fluid changed. If we keep it, I'll have to consider that synchromesh and Ceratec.
 

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2010 GC 3.8 Track 6MT
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132 Posts
Should have looked at the owners manual before buying the car.

IIRC, is says to have major service done at 100,000 miles, such as the timing chain.

$2500 for a timing chain job, and then another $1500 for their mistake? Yikes. Doesn't sound right to me.
$2500 is on the high side of a timing chain job, but not unheard of (depending)

All the 3.8 hyundai/genesis/kia Tau engines, use pretty much the same timing chain AFAIK. So they either, ordered parts for a completely different engine, or they are trying to drain you.
I would have asked to be shown how it doesn't fit.

As for the transmissions, try bleeding the clutch. With almost 150k miles on it, if bleeding it doesn't fit it, then likely the throwout bearing/clutch slave will need to be replaced (They are 1 part)
Reviewing my copy of the OM, there is no mention of service for the timing chain. At least, not that I could find.

5th gear is the only gear that scrapes... which is a known issue based on what I've read here on the GenCoupe forums. So I would expect it to be a synchronizer issue.

I'll stop by the Hyundai shop and see if I can get more info on the parts change that bumps up the cost so much. The parts were never ordered and the owner is a friend of mine, so I have confidence in the info he was providing. He was on the phone to the Hyundai shop when I was there. So before the job began, I was informed about the parts issue and the additional cost attributed to part changes by Hyundai.
 

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Reviewing my copy of the OM, there is no mention of service for the timing chain. At least, not that I could find.

5th gear is the only gear that scrapes... which is a known issue based on what I've read here on the GenCoupe forums. So I would expect it to be a synchronizer issue.

I'll stop by the Hyundai shop and see if I can get more info on the parts change that bumps up the cost so much. The parts were never ordered and the owner is a friend of mine, so I have confidence in the info he was providing. He was on the phone to the Hyundai shop when I was there. So before the job began, I was informed about the parts issue and the additional cost attributed to part changes by Hyundai.
Apparently I had things jumbled up in my head. From looking at the owners manual, it's part of the valve train inspection (valve clearances) and is suppose to be inspected every 60,000 miles
Page 7-9 of the owners manual.

FYI just because a part number is different for the same part from 1 year to the other doesn't mean it will not work.
The 2.0 for example the timing chains have different part numbers between the bk1 and bk2, but are interchangeable. Only difference is the link stack order, for better wear longevity.

Transmissions on the BK1s were put together with a hammer. What I mean is, when the car first came out and people were having issues, there was a tear down done on one, and it was found that the synchros weren't aligned when assembled, basically smashing the synchros when they were bolting it together at the factory.

If the car didn't have this issue and then suddenly started having the 5th gear issue, ESPECIALLY at 142k miles on it, it's likely a worn clutch and/or throwout bearing (clutch slave)
 

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2010 GC 3.8 Track 6MT
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132 Posts
IIRC, the valves on the GC use shim and buckets (going from my poor memory) and as such, aren't easily adjustable... or so I recall. I wanted the valves adjusted when we got it. But that didn't seem feasible.

Haven't had a chance to go by the Hyundai shop yet. I'll try to get more info when I can. The 5th gear synchro has been a problem for a long time for us... and based on posts here, is a long standing issue on the GC. It is what it is. And we're at 129k miles, not 142k, fwiw.
 

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2010 GC 3.8 Track 6MT
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132 Posts
Typically the exhaust valves wear into the seat reducing lash... and possibly causing valves to burn. I just had the valves adjusted on my Honda Ridgeline with 120k on the clock (along with a timing belt, water pump, etc.) and was very surprised to find all valves within 0.001 of spec. I was especially shocked that the exhaust valves were good.

The cold start timing chain noise on the GenCoupe is getting a bit alarming. Not sure how bad it can get before something lets loose. But I don't see spending $4k on this car at this point. It's a shame really because it's in really nice shape. Pondering my choices right now whether to let it run to destruction or trade or sell it.
 
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