M30 head cover plate part question

boonies

boonies

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I have a question about the "cover" plate on the back of the cylinder head (item #19 in the picture below). One of the boldts (#20) shows that there is an o-ring (#21) that is installed on the plate.

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I have just gotten my head back after the machine shop finished with some new work for me, and they did the dis-assembly and returned all of the parts in a bag. I was cleaning everything up in preparation for installation and find that I have a bolt that has a plastic busing/sleeve near the head and another bushing/sleeve that was included in the bag that I don't recognize. I had the head together after my rebuild, but could not find any pictures of these items. Do any of you know where they are meant to be installed?
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Hopefully @sfdon can weigh in here, but I remember years ago I was going to pull that plate because I wanted to determine which cam I have in my car. That didn't happen, but Don stated that that little bushing is required in order to avoid leaking. And I think the Realoem pic indicates where is should be installed.
 
decades ago we use to say that bushing / oring went on the mouth of the duck we called them duck gaskets and you can kinda see it
 
Thanks all, I will put a fresh set of eyes on it again tomorrow.

Based on the references above, the bolt with the bushing goes on the mouth of the duck.

The other bushing on the oil pressure switch.

Let me know if I have it wrong.

Interesting that i put this together about a year ago and don’t remember these parts at all.
 
Started the assembly and understand, the hard sleeve fits around the rubber seal on the bolt to keep it from getting crushed or damaged.

The frustration now is that, after assembling a fair bit, I had to take it apart to return it to the machine shop. The intake rocker arm shafts (front and rear) are slightly out of alignment preventing the head bolts from sliding into place…

Hope to have that solved this week and re-start the process.
 
That is normal- use a tool in the head bolt bore to shift the shaft over.
Cut the threads off a bolt to have a stopper bolt in that bolt hole in the the head when you install the head.
 
Thanks guys, I will give it a try. The shafts are slightly off-center and turned so that the curve to accommodate the bolt running through the head is a few degrees off. I will try to give it a shove with something solid.
 
HB Chris said:
We shimmed mine under the Duck cover.
Click to expand...
Thanks Chris, I did the same this morning. It was the front intake shaft that was slightly off and I was able to coax it a bit with a soft punch so the bolts now make it past the shaft.

I also ordered a set of retainers for the front opening of the shafts as I saw @sfdon mentioned them in a different thread.

Now ordering a few items from Belmetric and a few more carb bits from Pierce Manifolds...
 
boonies said:
The frustration now is that, after assembling a fair bit, I had to take it apart to return it to the machine shop. The intake rocker arm shafts (front and rear) are slightly out of alignment preventing the head bolts from sliding into place…
Click to expand...
BMW provided 4 special pins to keep the rocker arm shafts in proper position and alignment.
They were part of the 7003 and 7003-1 "iron maiden" tool set.

Anyone disassembling or reassembling cylinder heads should make a similar set of pins, to avoid such problems.

They're shown in use here, at 3:05 and 24:20 in this BMW service video...

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Jon B.
Vista, CA
 
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