Help... 6.2 Denali engine noise
#1
Help... 6.2 Denali engine noise
Ok so my truck has been running fine, 2009 Sierra Denali 6.2, 185k miles, oil changed every 5k. Tune and muffler only. Was driving to a friend's house, it was fine, no noise at all. Pulled up, shut the engine off, then when I went to crank it, it was making this noise. Engine shakes a good bit and running really bad. Sounds like it's in the valve train, I'm hoping it is. What should I do when I get inside the engine? I tow a little bit, have 33" mud tires and a leveling kit. 3.42 gears awd. Really don't want to get a converter due to not having much to spend. Really just need to get it fixed but figured I might as well upgrade since I'm in the engine. I drive a good bit, got the truck about a year and a half ago and have put 55k miles on it. So needs to be reliable.
#3
Just got done doing that, no Springs are broken. I'm thinking towards the lifter. I have a p0306 cylinder 6 misfire code
#6
TECH Veteran
iTrader: (36)
Lifter let go pull the heads is the next step. Inspect the cam really close to see if it is galled or pitted if it is anything but perfectly smooth gotta replace the cam. I don't remember which ones did or didn't have DOD they are all running together too damm many iterations these days. But if it has the valley plate that is not smooth on top it's got DOD. I'd delete the DOD. Install standard lifters and tray's and smooth valley cover turn off dod in tune and rock and roll. As long as the cam didn't get ate that's going to be your cheapest route. Dont get lazy or try to save a buck and do one side only you will only cost yourself down the road. It may be worth pulling the oil filter and cutting it open before you do all of that work to see if it's even worthwhile to pull the heads. If it's full of metallic paint shes screwed pull the motor.
#7
Head is pulled off, valve seat dropped and it hit the piston but not very bad. Got lucky. Very strange though. Never heard of a valve seat droppinh. Will post a pic when I get time
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