TIMING CHAIN NIGHTMARE

[JAX01X5]

Just thought I would post a little update. I received My cam timing kit yesterday and this morning decided to finish my tear down and start my rebuild.The first two pics are what was left of my timing chain guides and the rest are what I was able to get accomplished , thanks to the cam lock kit I bought from German Auto Solutions. I recommend this kit too anyone who is attempting this type repair. It is durable, accurate and very easy to use. Hopefully over the next couple of weekends I will have it running...

[BimmerM3inGA]

Good work! You don't seem to be having any trouble finding your way around that furrin' engine.

[J.Belknap]

Originally Posted by BimmerM3inGA

I'd be more concerned about a stretched and loose timing chain than the VANOS

What was your measurement of a stretched chain vs a new one?

[BimmerM3inGA]

I'm sure there's an official measurement out there somewhere. But I just compared the old chain to the new one.

[J.Belknap]

When visibly comparing the chain stretch was it a fairly large difference? I feel like when this is discussed more details would help. Bummer measurements weren't taken.

[BimmerM3inGA]

Sorry I wasn't more scientific with the measurement. In hindsight, I should have been more precise. It was not a huge difference when I compared the new chain to the old one for the 740i project, but it was noticeable. In that particular instance, there was visible damage to the primary chain from it rubbing on other engine internals. That was the prime motivating factor for replacing it (again, in this particular instance).

I think I still have the old chain in my junk drawer. If I do, I'll take some measurements. But like I said stretching, while a consideration, was not the primary reason for replacing the chain in this particular engine in this particular car.

With regard to the car being discussed in this thread, I would be worried about a stretched and loose chain due to the obvious beating this one has taken and the prior neglect. How much stretch is too much? That's a question I would like to know the answer to!

[J.Belknap]

Originally Posted by BimmerM3inGA

I think I still have the old chain in my junk drawer. If I do, I'll take some measurements. But like I said stretching, while a consideration, was not the primary reason for replacing the chain in this particular engine in this particular car.

Good deal!

Planning to take measurements when I do guides (and chains) at 200k. I wonder if the guys at Dinan or VAC have knowledge on M62 chain stretch from their racing programs.

[JAX01X5]

Well got it all back together and runs like crap.I know I set the timing correctly I was very maticulous about it! Won't even stay running at all. put a scanner on it code is "Camshaft Position Sensor 'A' Circuit High Input Bank 2". So I swaped the one from bank 2 to bank 1 to see if the problem would follow. No such luck,scanner still says the problem is in bank 2. Could both cmp be defective? Could it be the ECM ? Going to salvage yard on Saturday,they are having all you can carry for $40. I am going to pull both complete heads and the ECM . Does anyone know the location of the ECM? Is there anything else I should pull while I'm there?

[BimmerM3inGA]

I know you were concerned about possibly having some bent valves. Did you check them? That wouldn't explain the CPS code, but it would explain the poor running and stalling.

If you can get a set of heads for $40, that'd be a hell of a bargain!

[o3x5e53]

Should of changed the VANOS while you were doing this job. Other than that.. good job! love it.