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Removing the Vortec 8100 496 8.1L Double Roller Timing Chain Gearset
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- čas přidán 27. 05. 2022
- In this video I'll be working to remove the double roller timing gearset and cover from the Marine 8.1 Vortec engine that will be installed in our 2004 Yukon XL 2500 project.
Watch as I remove the LS style harmonic balancer, timing chain cover, camshaft gear, and source the proper gear puller to properly remove the crank gear.
To see more videos about the 2004 Yukon XL 2500 project -
• The Incredible Vortec ...
Thanks for watching👍
#8100vortec #gmt800 #yukonxl #vettesource
I'm the one guy who has never used a harmonic balancer so thanks for this. At this point in my life I will probably never need to use one but you never know Thanks man.
Yea, on the older stuff it's not that much of a chore, bit the tolerances on the newer generation engines is tight. Couldn't believe this one gave me so much trouble😁.
The small pulley diameter on the marine engine is worth 10 HP (spinning water pump slower) over the truck version at 5000 rpm. When you have unlimited access to less than 100 F water on the lake or ocean cooling is generally not a problem. Make sure harmonic balancer is fully seated on reinstall before setting torque. Stay with a GM OE harmonic balancer if you replace with a truck style (larger pulley diameter and belt centerline offset from front face of cylinder case). The GM harmonic balancer incorporates a Vamac elastomer which is bonded to the inertia ring and hub (high quality). Aftermarket harmonic balancers may not have a proper tuned frequency (not important on most other engines, but real important on the 8.1L due to long stroke / low torsional stiffness crank design above 4000 rpm). If you use the truck harmonic balance and get belt squeal / chirp you may possibly need to machine 0.020" off of the sprocket mating surface on the harmonic balancer (sprocket shoulder on 2001 and maybe some 2002 MY 8.1L cast cranks were too far forward affecting accessory drive belt alignment). Good luck.
Man, thanks for that excellent and informative writeup👍.
I was already noticing the shoulder difference between the double roller and stock timing gear like you mentioned, so I'll keep a close eye on alignment as I plan on reinstalling the original balancer from the Yukon 2500.
I just bought the same exact engine never been ran I was wondering if you used the marine cam and how did it run with the marine cam if you did thanks
Jose, nice talking to you👍.
Interesting swap
Yep, only necessary because the double roller won't work with the passenger timing cover and cam sensor for the later 04 truck. Plus the Marine engine has a different phasing on the cam gear I'm guessing due to being run at WOT most of the time.
@@VetteSource might as well throw an 8.8l crank in while you're at it
Good idea, but probably a little more power than I need in the Yukon since my wife will be the primary driver😁.
any chance in purchasing the marine harmonic balancer
Sure, you can reach out to me via DM @VetteSource on Facebook or Instagram.
Do you have the part number for the crank pulley bolt? I pulled up a part number it was listed a GM universal bolt.
Sure, it's 14022672.
@@VetteSource thanks. Did you use a washer before the bolt? I see 2 different schematics of the 8.1L and one shows a washer.
Yep, that's correct. There is a large washer that installs with the bolt as well. Final torque is 189 ft-lbs.
@@VetteSource thank you
Shouldn’t bash the crank gear on at all, the make a press for that with a socket. #4 crank bearings don’t like bashing.
I seem to remember seeing a press tool for that, but couldn't find a listing for it to save my life. Believe it or not, the method I use is the procedure called out for in the FSM.
Why are you converting from double to a single timing chain?
Hey Matt, this engine is a 2002 Marine version of the 496, and is equipped with some heavy duty components like the double roller timing gearset.
Unfortunately this double roller won't work in the 2004 Yukon 2500, which has the single roller timing chain, and a different cover and cam sensor. The timing for the Marine 496 is also different, so I was forced to use the passenger car gearset.
@@VetteSourceYou can use a JP Performance Timing Set JP5626T, double roller works with a 2004 cover and sensor
Excellent information, I'll look into getting one. Thanks for sharing👍.
Wondering why the sensor taken off can't be used .
It looked like a 1x cam gear
It only has that one job
I'd rather change the plug on the harness than change the timing set