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Discussion Starter #1
Hi, new user here. I did a search of this topic but found nothing. Anyway I'd be interested to know what you all think of this engine in general and what its strengths and weaknesses are.
 

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One weakness was the first timing chain tensioner design up to 08 when they came out with a ''B'' version. If you have the older design I strongly recommend you change to the newer design. Newer design has a dimple on the head. Also this engine likes oil at the full mark for better timing chain lubrication. Other than that all Pros
 

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Well, in my opinion...

Pros:
  • Low cost of the engine/car itself
  • Fuel Economy
  • Reliability
  • Ease & low cost of maintenance
  • Strong Internals on certain model years
Cons:
  • Timing Chain Tensioner (as Coby explained)
  • Lack of Variable Valve Timing
  • Less power than LSJ/LNF/LE5/LAP
  • Weaker internals in 2008
  • Expensive, unused electronic camshaft actuator (VVT not present, but half the parts are there)
  • No tuning available for the 2005 & 2006 ECM module.

Overall, I think the pros far outweigh the (admittedly picky) cons. Plus, some of the cons I listed should only be concerns if you plan on boosting the car. For a reliable daily driver, it's hard to go wrong with an L61 powered Cobalt.
 

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When I bought my 08 the first thing I wanted to do was replace the tensioner. I was too late it had already fallen apart and fallen in the cavity in front of the cover. Lucky for me' I was able to gather all the loose parts with a rod magnet and avoid hell. Also lucky for me the chain hadn't jumped. Replaced the tensioner, topped off the oil and it was as good as new.
 

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If it still has the old style tensioner definitely replace it asap, mine fell apart when I pulled it out and I only had like 60k miles on it at the time.
 

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When I bought my 08 the first thing I wanted to do was replace the tensioner. I was too late it had already fallen apart and fallen in the cavity in front of the cover. Lucky for me' I was able to gather all the loose parts with a rod magnet and avoid hell. Also lucky for me the chain hadn't jumped. Replaced the tensioner, topped off the oil and it was as good as new.
I haven't looked, but would his be an issue in my '09?
 

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When I bought my 08 the first thing I wanted to do was replace the tensioner. I was too late it had already fallen apart and fallen in the cavity in front of the cover. Lucky for me' I was able to gather all the loose parts with a rod magnet and avoid hell. Also lucky for me the chain hadn't jumped. Replaced the tensioner, topped off the oil and it was as good as new.
What do you think the total time start to finish and reasonable parts cost?
 

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If you don't have to fish pieces out of the engine, like a half hour or so you could have it done. It's not too expensive either, I think I paid 25 for mine

---------- Post added at 08:50 PM ---------- Previous post was at 08:49 PM ----------

I haven't looked, but would his be an issue in my '09?
My 08 still had the old style but mine was an early 08, pretty sure they switched mid 08 some time so your 09 should be okay. Takes 2 seconds to check though, reach back there and feel it. If it's flat it's the old style and if it has a bump on it, it's the new style
 

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Tensioner was about $75 Cdn and swap time depends if the tensioner is still together or has fallen apart. 20 minutes if it's still intack and 1-3 hours if it has fallen apart. My 07 took about 20 minutes and my 08 took about 2 hours because I had to fish the tip and the spring from the front of the timing chain cover. It would have taken longer if these had fallen to the bottom of the front of the timing chain cover.
 

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New style tensioner


---------- Post added at 08:54 PM ---------- Previous post was at 08:53 PM ----------

Might be able to find it cheaper if you shop around but
https://www.amazon.com/gp/aw/d/B0049Z8JNC/ref=mp_s_a_1_1?ie=UTF8&qid=1499907249&sr=8-1&pi=AC_SX236_SY340_FMwebp_QL65&keywords=12608580&dpPl=1&dpID=417zQn2gz8L&ref=plSrch

---------- Post added at 09:01 PM ---------- Previous post was at 08:54 PM ----------

Got mine through Amazon warehouse deals for 25 haha, looks like amazon is about the cheapest right now though
 

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Far out
I remember reading Coby7's original post about it last year

Rob, if you dont mind, do you remember where you got that
Delco part? Think I should get one for the 08
Forgot the build date

Its coming up 1 year of very pleasing driving so its time for a little PM...oil, filters, may even look again at that fresh air servo, and I still need a drivers floor mat. Ya know real big thing :)
 

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If the 08 still has the flat tensioner then I would definitely change it as soon as possible. I got mine from Amazon and I linked to it in the last post. Like 35 bucks or something like that

---------- Post added at 09:42 PM ---------- Previous post was at 09:41 PM ----------

https://www.amazon.com/dp/B0049Z8JNC?tag=vs-auto-convert-amazon-20

---------- Post added at 09:46 PM ---------- Previous post was at 09:42 PM ----------

Part number is 12608580 if you want to shop around, a quick search and amazon is the cheapest I found
 

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Just checked for 12608580 at just one place.
Beck/ Arnle 20.79
Cloves 32.79
ACDelco 33.79
And now see the bump

Without looking...are there any other gaskets or o-rings one messes with such as main valve cover?
 

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Stick with the ac Delco for sure, and unless you tear the seal for the valve cover or something you don't need to replace it. Just clean and re use
 

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Discussion Starter #15
New tensioner install complete. We struck the tensioner a few times to activate it after we torqued it in, but is there a way to verify that the tensioner was activated and installed correctly?
 

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New tensioner install complete. We struck the tensioner a few times to activate it after we torqued it in, but is there a way to verify that the tensioner was activated and installed correctly?
The chain will tighten up when the tensioner is released. So if you have no play you're good to go.
 
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Discussion Starter #18
Aluminum engine?

Any issues with the Aluminum blocks? What rpm do you shift at when driving around the city?
 
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