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on 4.7. have all marks lined up. remember pulling off sprocket from cam that it did rotate a little bit. now I have to move the cam some to get the sprocket back on. is this right? Just seems so weird t have to do that. even the manual says it will rotate some. why? can you help...
I need to replace my timing cover gasket. Do you have to remove oil pan to get it off? That's what I keep reading but doesn't look like it in your pics
I have rebuilt two 4.7's. First of all, if someone brags about their 4 bolt Chevy, you laugh in their face because your engine has 27 bolt mains. Also, strange enough, they both had spun bearings.
That "main timing sprocket" is the idler sprocket and if your planing on re-using the engine your going to have to replace the main tensioner you broke and the timing chain guides I just did my 4.7 cost around $500 in parts with new timing chains and all gaskets ands seals took about 6 hrs you have to get both cams and crank at TDC align the chains properly on idler and crank sprocket slide it all in place without moving chains then remove cam sprockets w/out moving cams to put the chains on them aligning the dots then reinstall sprockets on cams again w/out moving cams from TDC then hand turn the crank w/wrench 2 full engine rotation and check that all sprockets are back at TDC and that's just to set the timing! It's not a job that just anyone should take on especially someone that don't even know what the parts they are removing are called!
As I said, I've rebuilt two of the 4.7s. Those timing chains will help you learn new curse words! Make sure the intake is torqued down properly. When my cousin started his up, it sounded like the pump in the transmission was going implode. It wasn't just a vaccum noise, it sounded more like a Pneumatic Die Grinder. Once the bolts were loose, and torqued down in the proper order, all was well!