When the #1 piston is at the top,you could be at TDC for #6 or #1.
There are 2 easy ways to determine if the engine is at TDC for #1.
As you're turning the engine while watching for the TDC mark on the crankshaft pulley, you can put your finger over the #1 spark plug hole to see if you can feel the motor trying to make compression, if it does, then engine is at TDC for #1
Or you can watch the rocker arms for #1 through the oil filler cap hole and if the rockers don't move as you are approaching and then getting to the TDC mark, then the engine is at TDC for #1.
If the rockers move,while approaching the TDC mark on the crankshaft, then you need to turn the engine another 360° to get the engine at TDC for #1.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502 hiperformanceautoservice.com or oldvolvosonly.com
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