I did my final check on my Tb change and I put the Crank balancer on backwards. I have the belt off again and corrected the issue, the settings are as follows:
TDC 0" Pass cam 45 degrees as described in book, Drivers at 45 Degrees before TDC just the opposite.
My ? is can I turn the cam backwards to align it or If I turn it over the crank completely will the valves hit the pistons?
Help

 

If I understand correctly, pre 32v is non-interference engine so should be OK. 32V engine needs to be at 45° before ( I think) TDC before the cams can be rotated safely. YMMV

 

Hi turn the crank position to 45 degrees before top then you turn the cams

 

I had already installed the belt and removed the crank lock and rotated the crank 2 times to adj tension. I just caught this when the air pully was not tight when removing the system I then saw the timing issue. That means I already rotated the motor. Zuse told me to remove the plugs and reconnect the belt and rotate it back to 45 Degeees. If I damaged something I already did it. Once back in place Recorrect the cam on on drivers side and turn over again and check for compression.
Any one is welcome to chime in!!
86 928s

 

Looks like the drivers side was advanced 3 teeth 22.5 Degrees. Do you think this did any damage when I turned it over by hand? Plugs are out and it turns over ok Should I turn the cam and see how it feels?

 

Get it timed up properly and do a compression check. Barring that, just start it up and see how it runs once the marks are lined up. 3 teeth isn't TOO bad, you may have gotten away with it as you probably would have felt inordinate resistance turning the crank had you been colliding hard with valves.

 

Mark,
I am sure you would have felt the resistance when you were turning the crank.
Get your crank back at 45 and then get your cam gears lined up properly.
Make sure you are lining up the cam gears with the mark at the back of the cam gear not the large one at the front of the cam gear.
Roger

 

In the WSM, page 15-15, Porsche says "never turn engine anticlockwise since this could destroy the camshaft drive belt tensioner."

They are talking about the cam chain tensioner.

I doubt the valves smacked anything. You would have felt that.

 

Yup, just like the other said. If you already turned the engine over by hand and didn't feel it locking up (hitting the valves) then you are ok. If it's a 16V engine than it doesn't matter, just re align it with the O/T. If it's a 32V, the you can set it at 45 and guestimate the aligment of the cams or try to set everythign up at O/T. You will feel when or if the valves hit the piston. If they do don't force it.

I did the same thing on my first 928('83) took me nearly a day to figure out that the balancer was on backwards. Turned it around an aligned it, then the engine fired right up. My brother bought the car after me and has been running fine ever since.

 

Roger

I see the little v- on the cam teeth that is the one I used. I pray I did not damage it it was hard to crank with the plugs in. I am going to align my 45 Degree Crank with the previously marked 45 Degree on both cams. This happened because I changed the cam seals could the cam be placed on any other position on the rear Y connector that is used for the rotor? I matched the back rust or impression on the Cam to keep the timing correct, but could I have placed the Y in the wrong position is that possible? That would throw off my rotor timing, it does have a wooddrif so that maynot be the problem !!!!!!!!!!!!

 

You left the plugs in while cranking?!? Wow! This takes away most of the control, but even with them in, the engine would have stopped turning if the vavles were in the way.

This latest post starts to scare me. I'm not sure if you should try to put the engine back together or just leave it as is and take it to a 928 mechanic, let them finish it.

 

The woodruff key ensures it can be aligned only one way so your ok.............this is a 32v engine?

 

(28 Mech good luck around the Tampa area do you recommend one?

 

Ok fair enough. Are there any rennlisters in your area with t-belt experience that can give you a hand?
From now on, untill you have the timing alighned, only turn the engien over by hand with the plugs out.

 

Assuming you "rust" marks or "impressions" were very clear, slap the balancer back on (correctly) and check it at 45 degrees BTDC (22 cam degrees) using your marks. If the cam timing is in the ballpark, rotate to zero and check for final alignment.

The first time I did the timing belt I didn't realize the cams gears were adjustable. Pulled the gears off to replace them and saw my error when I noticed the big keyway. So, I had to rely on the same corrosion shadows. They were actually pretty clear and definitive or I would have had to pull the cam covers and do the factory timing check. Subsequently I have been more careful about marking the gear position.