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I am rebuilding an engine and i need to fix the timing. The engine doesn't have a chain or belt, just a gear on the crankshaft and another one on the camshaft.
The camshaft gear has a mark but the crankshaft one doesn't. The only thing the manual specifies is when should each valve open/close. How am i supposed to do this?
First step is to get number 1 piston at TDC.
Once you have done that then you can engage the camshaft gear with the crank gear using that mark and looking at the camshaft so that you have it in the correct position or at least close to ie where both valves are closed.
Sometimes you need to turn the camshaft so that as the gear teeth engage the cam gets rotated to the final correct position. This is the case with helical teeth.
On my engine, there was a mark on the camshaft gear and an arrow on the crankcase/engine shell. I had to align these while the crankshaft was at TDC. I also found out that the best way to do what i initially asked for is to get the crankshaft to TDC and the camshaft in the midpoint of the valve overlap.
