[Sapote]

Hmm, so what will seal up between the timing cover top side to the head? Not the old head gasket that the thin sealant beads are gone or damaged during the cover removal.

 

[The_Fixer]

Hmm, so what will seal up between the timing cover top side to the head? Not the old head gasket that the thin sealant beads are gone or damaged during the cover removal.

Bubble gum and a prayer...... lol.

I'm guessing that it's perfectly fine to do that way by the TIS. If it failed a lot after doing it that way they wouldn't do it at all and recommend pulling the entire head to replace the gasket.

Even so... I'd be sweating it.

 

[Sapote]

Assuming OP has a small oil leak on the timing cover, and let just say it's possible the sweat oil is between the cover top and the head. So now he remove the cover, then put it back using the same old and worn head gasket. Is this better or worst, before and after?

Now, I can see the reason one is taking the risk doing that way if one must replace a broken chain guide, but to try fixing a leak and using the same old worn head gasket?

 

[MrMCar]

Here is the problem with BMW's systems, testing methodology and scan tools:

BMW is a BIG business. Amongst the many things they do to cut down on operating costs is to write,design the test plans in ISTA that guides the technician towards the fastest repair.
Most of the test plans are solid, some not. Given that we're "thinking technicians" here, some of the conclusions drawn up towards a resolution of the issue with the customers car are just ridiculous. Furthermore they way the 'guided tests" are written, it's no wonder that they are (trained) parts replacers.

Take the above example: If the timing cover is leaking. Just replace the pan gasket, glob up the head to cover interface with goo and if it doesn't leak..... BMW is off the hook for reimbursing the dealer for an extra 5 hours of labor.

Would this be the approach of the conscientious BMW DiY guy? Likely not.
But like I mentioned before, there's a completely different level of skill involved in replacing the head gasket, timeserting the block and bleeding the cooling system.
Many, not all will have additional issues after such work?

 

[TobyB]

Assuming OP has a small oil leak on the timing cover, and let just say it's possible the sweat oil is between the cover top and the head. So now he remove the cover, then put it back using the same old and worn head gasket. Is this better or worst, before and after?

Now, I can see the reason one is taking the risk doing that way if one must be replace a broken chain guide, but to try fixing a leak and using the same old worn head gasket?

This. Pulling the timing chain cover without pulling the head seems like a fix that's going to make the problem worse.

03

Dowel pin

5 H8X14

2

07119942283

These are going to make it pretty darned impossible to get the thing back on AND keep it sealed.

I did it with a relatively fresh M10 that had chewed up its front cover. It took several tries.

For an M42, I just pulled the head when the profile gasket gave up.

t
wouldn't do dat.

 

[Sapote]

This is why I will vote just leave it alone, not worth it.