You have a MAJOR Engine Repair Project going right now that probably would be better served if you can ask a Moderator to consolidate all of your recent questions about this work and park all of these separate, but related issues under One Umbrella. Otherwise, your separate, staggered inquiries might get missed as being isolated events ...rather than being Parts of this WHOLE Repair Project. Examples of this would be the recent individual Threads you have going concerning the following issues:
(1) The Removal issues of the Crankshaft (...Asked and Answered)
(2) The GM OEM Part Numbers for the Crankshaft and Con-Rods (...Asked and Answered)
(3) This latest issue concerning the Timing Chain Guides being loose... Answered as Follows:
This is an image of the Timing Set for the GM 4.2L LL8 Engine that shows three distinct Timing Chain Guides One on TOP, One on the Driver's Side and One on the passenger Side of the Engine, One Timing Chain, One Cam Phaser Exhaust Sprocket, One Intake Sprocket, One Crankshaft Sprocket and One Timing Chain Tensioner:
The Timing Chain guides being loose are symptomatic of having either Worn Down and Dried out... or Fractured-Cracked and Broken Nylon Chain Guides. This repair requires replacing the ENTIRE Set ...and the recommended replacement kit is made by Cloyes and costs around $160.00 from Summit and other vendors like RockAuto (RA):
Before you begin to take apart
anything related to the Timing Chain Guide R&R... Your next "Port of Call" is to view the very Excellent "How To Replace the I-6 Timing Chain Tensioner" Thread linked below that was created by
@Mooseman. While reading over his Instructions... you should also view the bottom of any of his Posts for his Signature Line to obtain more information on
How to Download a Digital OEM Factory Service Manual for your specific Vehicle. You WILL Need this Manual:
This is the last of several articles during my work to replace the timing chain and tensioner. How to replace the I6 timing chain and tensioner. Difficulty (out of 5): 8 (I'm not kidding) Tools required: Assortment of wrenches, ratchets, extensions, screw drivers. Socket sizes: 7mm, 8mm...
gmtnation.com
After viewing the Video you added here, the Motor displayed the condition of having much Baked on, Carboned Up Gas Gum residue covering the front of your Engine. This strongly indicates Excessive Piston Ring Blow By from High Mileage and from Infrequent Oil Changes. These engines demand using Mobil1 5W-30 Motor Oil or some comparable Full Synthetic and Very High Quality Oil Filters as well. This next image shows the very same area viewable on an Engine that had 160,000 Miles before the Owner totaled the vehicle in an accident. This is generally what the inside of any Atlas Engine should look like that has received Regular Oil Changes at 3,000 Miles:
If you decide to replace the entire Timing Set... Spray down and Scrub off that entire area with Berryman B-12 Spray to dissolve away all of the Gas Gum Deposits prior to re-assembling everything.: