Replace timing chain

We are trying to replace the timing chain on our vehicle because the engine quit running after making a lot of friction noise. We discovered that the plastic material on the top and side guides were totally worn out and the chain's tension-er was seized. When installing the new timing chain kit as per the Haynes Book's instructions we were able to align the two top camshaft sprockets so that the two sprocket pin holes could be filled with a drill bit to stop the two camshafts while the new chain's black links can be positioned at twelve o'clock of each camshaft sprocket; however, now I cannot align the bottom crankshaft sprocket with the twelve o'clock mark on the engine block. It is as if there is some kind of internal crankshaft blockage which prevents me from turning the crankshaft. I am able to reach approximately the 12:05 position instead. At this point I can not move the crankshaft counter-clockwise. Initially, when I tried this procedure I was able to reach the twelve o'clock position and I manually turned the crankshaft several complete turns. Then when I put everything back together I disconnected the fuel pump's relay and cranked the engine to test the pressure in the cylinder. Then I realized there was no pressure. I attempted to manually turn the crankshaft and discovered that I could not pass the twelve o'clock mark on the engine block. It was at this point when I discovered the crankshaft blockage. We would appreciate any one who could give us some advice on how to resolve this problem. Thank you.

Jim

1993 SATURN SL2 Difficulty Reaching Top Dead Center

Thank you for your prompt response. I will definitely use your suggestion to remove the head cylinder to resolve the blockage in turning the crankshaft to reach the 12 o'clock mark on the engine block. But for now what I did was remove the chain, the two camshafts, and all the covers for the valve springs in an attempt to see if there was any valve shaft in the down position. I discovered that all the springs are o.K. But I wonder if there is a way to confirm that all the valves are still attached to the springs without removing the head cylinder at this point. Thank you for any suggestion you may have.

Jim

Thank you for the information. We tried the camera and confirmed all the intake valves are bent. We removed the cylinder head and placed an order for all the intake valves and gaskets. My question at this point is if we can reuse the cylinder head bolts. We would appreciate your comments. Thank you.

Jim

Thank you once again for your help. We decided to buy a new set of cylinder head bolts. In the mean time while we are waiting for the eight new intake valves to arrive I would like to know if the new intake valves from Sealed Power (part # V4507) require any adjusting for the stem length. We are going to reseat these valves just as we did with the exhaust valves. According to the tech gurus at Federal Mogul the new intake valves are built to spec. And do not need any adjustment in the valve stem length as long as the head cylinder seat is O.K. I would appreciate your comments especially if we still have to file the valve stem length. ( If so, what gauge measurement do you recommend?). Thank you.

Jim