2000 s80 acts like timing but marks line up

Elvisian · Post by **Elvisian** » 22 Apr 2015, 18:04

Hey folks,
I got a 2000 S80 that just quit running one day while idling. It acted like timing belt but the belt didn't break. My question is, "when the crankshaft mark is lined up, is that suppose to be TDC? because all my marks ling up but I have to turn the crank an additional 90 degrees to get the #1 piston to tdc. I thought maybe the Keyway was shaved on the Crank pulley but there isn't one, it's splined. (my first Volvo can you tell?) Any ideas what could be wrong? It the crankshaft mark on a Volvo 2.9 isn't necessarily TDC that my timing is lined up but I have no compression.

I'm a little baffled so I'm trying this forum for help.
Thanks
E

draser · Post by **draser** » 24 Apr 2015, 13:40

It won't be TDC, normally is ignition point for that cylinder, not sure on Volvo though. And usually ignition happens before TDC, by a number of crank degrees. But it can't be 90, so in Volvo's case mark alignment is just a checkpoint. Or so it looks. Back to the question, you run a compression test and have none or I'm reading this wrong?