Timing chain replacement - Page 3 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #21  
Old 01-14-2010, 04:36 PM
Atlwrk's Avatar
Atlwrk Atlwrk is offline
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2006 Chevy TrailBlazer LS
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This proceudre should be in the Hayne's manual.
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  #22  
Old 01-14-2010, 04:59 PM
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Atlwrk Atlwrk is offline
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2006 Chevy TrailBlazer LS
Summit White 4.2L I6 4X4
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Looking at the parts explosion for your engine you're at least looking at removing the fan/waterpump, harmonic dampener and timing chain cover.

http://www.compnine.com/largeimg/060316TS00-403.gif

Looking at http://www.compnine.com/largeimg/030826TS00-404.gif
I wonder if it's possible to remove and replace just the cam actuator by removing the valve cover and overpowering the tensioner. You would have to be VERY careful not to move or drop the timing chain though.
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  #23  
Old 02-02-2010, 09:13 AM
han2542 han2542 is offline
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2005 GMC Envoy SLE
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Quote:
Originally Posted by Atlwrk View Post
Looking at the parts explosion for your engine you're at least looking at removing the fan/waterpump, harmonic dampener and timing chain cover.

http://www.compnine.com/largeimg/060316TS00-403.gif

Looking at http://www.compnine.com/largeimg/030826TS00-404.gif
I wonder if it's possible to remove and replace just the cam actuator by removing the valve cover and overpowering the tensioner. You would have to be VERY careful not to move or drop the timing chain though.
hi i am a new member and i am from puerto rico i recently had to a timing chain instalation on a trailblazer 2003 and it had an i6 engine and what you shoul know its that many parts have to be removed like for starters the oil pan has to be taken off because the timing cover has a bolt attached to it from what we call here is the oil neck and for you to get it off this has to come otu first and then there is the timming setting on the chain wich is simplket to set for the exepcion of something that says that the exaust actuator has to be set forward to be installed i still am trying to figure that one out i did install everything back but feels like there is a lack of power on my engine i dont get any codes and it runs but still trying to figure that out hope this helps
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  #24  
Old 02-03-2010, 12:04 AM
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smalltownrp830 smalltownrp830 is offline
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2002 Chevy TrailBlazer LS
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too much work for me with internal parts. i'd just get a used motor for under 1g
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  #25  
Old 02-03-2010, 12:29 AM
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KNBlazer KNBlazer is offline
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2004 Chevy TrailBlazer LS EXT
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I did not read all of this... but a timing chain? if you have multiple codes coming up, I would look for a CAL update, that might fix your problems... other than that, good luck...
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  #26  
Old 02-03-2010, 01:33 PM
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wardak33 wardak33 is offline
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2002 Olds Bravada
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I got those same exact codes when my idiot cousin put an additive in the oil, I think it was called something like RESTORE. About a mile of driving later, engine would chug and stall and I would get the SES and REP lights. I just changed the oil and disconnected the battery and all is fine now. If you're using a good oil and not those cheap $5 additives, then read below.

Your timing chain is fine. There's people on this forum that have well over 200k miles and did not mention anything about a timing chain being replaced simply because they don't need to be. Changing the camshaft actuator and sensor was something i would've done too. If anything, you may just need a CASE relearn from the dealer to fix everything up.

There is a how-to on the site for replacing the camshaft actuator solenoid. Its not that hard and takes about 30 minutes. You need to take off the serp belt and get to the power steering pump and take that off as well. That way you'll have a lot more clearence for the actuator.
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