Hello, I've got a question... if I may. If the crankshaft to camshaft ratio is 2:1 and you are starting from scratch how do I now what rotation the crankshaft is on? First or second time rotation, in regards to ratio... Did that or does that make any sense? 1998 V70 base, engine serial number: 14441...

The ECM determines if it is a compression stroke or exhaust stroke by the position of the camshaft and other data. Get the Crankshaft, Camshafts in mechanical alignment, the ECM will deal with the rest. There is only one mechanical condition where the three timing marks line up. Just make sure the c...

To phrase it using the language of the original question: in the power cycle, the first and second rotations of the crankshaft to which you refer are geometrically identical.

Just adding the obligatory reminder to these threads that the valve timing marks on the crank and cams are NOT top dead center marks, but non- interference marks of piston and valves.

I recently replaced the water pump and timing belt of my 04 XC70 165k. First time I've done this job. I was losing coolant from the water pump. Mechanic who did timing belt 70k miles ago did not fully screw-in one of the 7 bolts of the WP and coolant must have leaked thru gasket. Anyway, I believe I...