dual overhead cams rebuilt heads


Asked by Aug 07, 2017 at 06:34 PM about the 2001 Volkswagen Passat GLS V6

Question type: Maintenance & Repair

From the point I took the apart and when i put them back together, during that time they were moved. So the cams were mixed up. Yes I marked them. What I didn't do was mark the heads. So they are together and on the block. I am trying to set the timing. The cams are locked into position and I am attempting to set TDC on crank shaft. I rotate the crank and get about 2/3 the way and stopped. Wont go any farther. Rotate counter lock, goes all the way back to the same position and stopped. So I take it all back off except heads to see whats up. Whats happening is piston is rising up and cant continue because its stopped by valve heads that are open about halfway because the camshaft gear locking tool has them sitting. Is this correct. Am I suppose to set TDC piston first and then the camshaft key locking tool to set cams perfectly. Because the book I have says completely opposite. Set cams with tool, leaving gears slightly loose to rotate as you set crankshaft to timing marks. Thus camgears will rotate then once timing marks are aligned torque down gears setting timing perfect. So why does one of the pistons keep it from rotating especially if I need to rotate another 360 to reach compression stroke instead of exhaust. Could the cams have gotten mixed up in regards to the heads they needed to be installed in. Because when I pulled heads valves were not sticking out from bottom of head. And started to install cams in wrong heads and the valve stems were sticking so far out that they would have gotten bent. Realized that and switched cams around. Now I am stuck and need to finish this car. Dont want to end up trashing pistons or valves or the whole engine completely

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