'95 850 GLT 245K


Just replaced the timing belt. The engine cranks but will not start. There is adequate spark and the engine produces no knocks while cranking. Matter of fact, when cranking, it sounds like the engine is just ready to begin firing on it's own but just wont get to that point.

I've replaced the belt on this car several times with out incident. I've made sure to align the cam marks to the belt cover before proceeding. After putting the new belt on I could see that that the intake pulley had moved 1/4 of a rotation clock wise. The exhaust was also off slightly. I rotated both a full 360 degrees clockwise till they aligned with the timing marks on the cover as well as the aligning the crank, but still a no start. Did rotating the cams throw the timing off! How many revolutions do the cam shafts make per one sequence.

Thanks!!!

 

You shouldn't be able to rotate the cams all the way around like that on an interference engine. Why didn't you just rotate them back to the correct marks?

 

Ok, does it make a difference which way or how many rotations I turned the cams as long as they line up with pulley cover? And why "no start" when all three marks in proper alignment? I've seen this problem come up several times with no solution. Thanks

 

You should not be able to rotate the cams fully in any direction without hitting valves.

You'd have to do a compression test and cylinder leakage test to see if you have bent valves.

 

any thoughts on the no start

 

Again, you'd have to do a compression test to make sure you have compression and a CLT to check where it's going if you don't.

 

Cold compression tests are unreliable. Even with a bent valve, the engine will try to fire up. I've hand rotated the engine through several cycles with out a problem. The engine cranks with out any noise. Here's another thought. Behind the lower portion of the crank pully is a round cylinder that protrudes from the block. It's always a problem to get the belt passed this. Is this the crank sensor?

 

The camshafts rotate at 1/2 speed of the crankshaft .
What types of service literature are you using to perform this operation ?

 

No, it is not the crank sensor, or any sensor at all.

Cold compression tests are just fine. If a cylinder has 25 PSI, it isn't going to jump to 175 just by being warm.

What you are saying doesn't make sense. The car doesn't have CVVT, so I have no idea how one of the pulleys just randomly moved 90* on it's own. Furthermore, being an interference engine, if you try to move the camshaft on it's own, eventually the valves hit the pistons. This shouldn't even be possible.

When you say "I rotated both a full 360 degrees clockwise till they aligned with the timing marks on the cover as well as the aligning the crank", does that mean you moved the crank as well? If you rotated the crank one full turn as well as the cams one full turn, your cams are 180* off.

 

I appreciate the advice. The issue at hand is how to reset the cams to there proper place

 

So you aren't going to clarify exactly what you did? Help me help you.

 

Duplicate thread in the 850 section.