TIMING CHAIN NIGHTMARE - Page 7

swissfrank · #1 08-16-2015, 04:45 PM

Nope just disconnect the two bolt per bank that connect the manifold to the down pipe and maybe a little wiggling they go.in and out quite easy. Twomsets of hands definitely make it a lot easier. Pic showing the manifold attached to the head either when I pulled it out or put it back in.

JAX01X5 · #2 08-16-2015, 04:57 PM

That's a pic of the P/S I am speaking about the D/S . not that it matters if you say you got it in and out I'll try putting it back in that way , It might go in easier then it comes out.

BimmerM3inGA · #3 08-16-2015, 08:37 PM

I didn't pull the heads when I did the work on the 740. So unfortunately, I don't have any tips for you. But the suggestion that swissfrank made seems logical.

PapoChicharra · #4 08-25-2015, 10:37 AM

JAX01X5/ Tried to send you a private message with a question but it disappeared on me, so here it goes:
Hi again/ I've read every single one of your post hoping to find an answer on how to correct the misalignment of the camshafts. Like you, I also drove like ten miles after the symptoms of chain slides failure which resulted in a loose bolt at the intake camshaft in bank 1 destroying the camshaft.
I now have bank 1 on TDC correct, and the Intake camshaft on Bank 2 markings facing up, but the Exhaust camshaft in bank 2 is off like 45 degrees. Weather I move it clockwise or counterclockwise it is still 45 degrees off and it comes to a stop going no further. Could you share your procedure to correct this...?

BimmerM3inGA · #5 08-25-2015, 10:59 AM

The cam is coming to a stop because the valves are touching the pistons.

I had a similar problem with my 740 because I made a mistake taking it apart and got then engine badly out of time. To get it back in time, I noted the position of the crankshaft and then rotated it a little at a time by hand and then turning the cams a little at a time until I got everything lined up. It was tedious, but worked.

PapoChicharra · #6 08-25-2015, 12:03 PM

Thank you BimmerM3inGa for your immediate response.
This procedure should be perform with tension in chains or without...?
Moving the camshaft clockwise or counterclockwise matters...?

BimmerM3inGA · #7 08-25-2015, 12:08 PM

It helps to have enough tension on the chains to keep them from skipping on the sprockets. But I did it with no tension at all and it worked fine.

You should try to turn everything in the same direction. I don't think it matters if it's CW or CCW, as long as you turn everything the same way.

EDIT: I would turn it whichever direction is closest to TDC.

PapoChicharra · #8 08-25-2015, 12:12 PM

Thanks again friend. I'll try that.

BimmerM3inGA · #9 08-25-2015, 12:21 PM

You're welcome. Good luck!

JAX01X5 · #10 08-25-2015, 08:50 PM

If you move the crankshaft to 45 deg OT you will be able to rotate the camshaft all the way around. The Bentley manual and Beisan procedure are not totally clear on the position of the cam shafts although they both elude to the "E" AND "A" markings facing up when installing the cam locks . The G.A.S instructions make it very clear that the markings should be facing up when installing the cam locks and this is the way I did it the first time. I am almost done rebuilding my heads the first week of September and will be putting it back together at that time. I will let you know how it turned out when it is running.