I took on the task of changing the timing chain, guides, tensioner, and sprockets on a 4 cylinder 2.9L GM engine that comes equipped in GMC Canyon, Chevrolet Colorado, Hummer, Isuzu Ascender, and Chevrolet Envoy. It was no easy feat, but there wasn't really anything difficult about changing the timing chain. Really, the only problem was how the engine was engineered - it took an excessive amount of time to remove all the components in the way of accessing the timing chain.
Since Chevy or GMC products are not my bread and butter, I took to the internet to find a detailed guide on replacing the timing components. I didn't find much in my search except basic instructions, so I decided to write a detailed how to guide on changing the timing chain on your Chevy Colorado or GMC Canyon specifically, although the guide will work for other makes and models.
Normally here at Expertswrite, I write articles focused primarily on Ford products because of my job at a Ford dealership. I rarely get the opportunity to work on any other brands of vehicles as I do not generally work on the trade in cars. I came across working on this GMC Canyon because my brother owns it. The local shop wanted, what I thought, was an excessive amount of money so I set out to to replace timing chain, guides, and tensioner on his 2.9L engine in my personal garage to save him a lot of cash. If you want to hear more about the story on my brothers truck or see a video of my thoughts on this project, you can read about it in TechTales : GM 2.9L Engine Crazyness.
There is mentions of specialty tools to time this 2.9L engine in the shop manual, but these tools are not required. The way this timing is done on this engine you actually can do it without any specialty timing tools by following this article. This guide was written by memory of working on a 2010 GMC Canyon 4wd, so likely pictures won't be added in later unless I find appropriate pictures I'm allowed to load elsewhere. The Chevrolet Colorado model may be slightly different, also other years may be different. The 5 cylinder 3.7L and older 2.8L are very similar
A few things you are going to need. Most of the required hand tools are listed in that step of the directions. Here is a small parts list below:
Lets get your truck back on the road...