I apologize if I am re-hashing the same problem, but I could not find anything on my particular issue. 1998 S70 GLT. I bought the car with a blown head gasket. First, I aligned the cams and when I got the crank pulley off, I noticed that the crank timing gear was NOT in alignment with the engine timing mark. The crank appeared to be exactly 1 tooth advanced (to the right). Well, I had to tear the engine down and figured I would address the timing issue later. It is now time to figure it out.

With the head off, I can see that cylinder 1 is at TDC. Looking down at the crank pulley, it is exactly 1 tooth advanced. If I rotate the crank so that the timing marks align, then piston #1 is about 1/4" from the top of the bore.

I have checked and re-checked the internal splines of the timing gear pulley...perfect condition. The gear goes on only 1 way.

There is evidence the belt has been changed in the past. Is it possible the gear has been replaced?

So, what's going on? Any ideas? If I could just figure out how to attach pictures...

Thanks, Greg

 

The piston is NOT suppose to be at TDC when on it's mark. Put the crank on its mark and align the cams correctly. It is possible that the car was running with the crank off by 1 tooth. Probably not good but it will run without interference.

If you did NOT pull the sprockets from the cams you will be better off. I would double check the cam timing since the crank was off.

Not sure who's instructions you are using but I never remove the crank pulley when pulling the timing belt. Here is my tutorial. You may see a good picture of my #1, the crank is on the mark.

http://atthetipwebs.com/technologyin...ead_gasket.htm

 

I am not just replacing the t-belt, but doing a head gasket repair I bought the car this way and since this car is new to me, I feel it is important to perform an inspection of pretty much everything under the hood to check for concealed seal leaks, old/weak hoses, etc. Removing the pulley was needed to look at the seal behind it and to check the condition of the internal teeth.

I worked on a 2004 V50 T5 earlier this year that would not keep it's timing. It turned out that the internal teeth of the timing gear were nearly gone! The crankshaft splines looked perfect, so a new timing pulley gear was installed and all was well.

Anyway, thanks for the input as I was not aware the timing marks for the crank were NOT TDC.

 

Wow, that is the first I have ever read about a bad crank/balancer on these cars.