engine and drivetrain Mystery Stud Through Water Pump

[PaulTWinterton]

So I'm doing a re&re on my timing chain guides, seals etc and replacing the water pump.  I notice that one of the water pump bolts is actually a stud going through the lower timing chain cover.  REALOEM shows a bolt not a stud. 

 

Can anyone confirm that this is correct or NOT.

 

Thanks for reading and replying.

[Guest_anonymous]

if the car had an A/C bracket at one time studs are shared in some locations. If not you can use the correct measured length bolt as specified on the schematic from realoem

Edited May 22, 2016 by dar_on

[stephers]

The water pump covers the shouldered area of this bolt so there is just enough room for a nut. Hard to have anything attached to this. I know this car very well and have taken apart probably over 100 2002 engines and have never seen this. No emissions for a 72 so thought that maybe an AC bracket as well but not enough thread showing once the water pump is on

 

?????

 

Thanks, Rick

[cda951]

Don't trip out about a stud being there. My '73 tii has a stud in the same location. My boss fabricated an A/C compressor mounting bracket for the previous owner of my car 15+ years ago, and that stud helped to locate the whole thing. There are two additional very long bolts (8x100+ mm) that hold the bracket and water pump from the front.

 

Ironically, the A/C compressor is not currently installed in my car and I have a replacement on the shelf, but i eliminated it for the time being because the previous compressor was getting noisy and the existing wiring (installed long ago by another shop) was sub-standard and I ripped it all out. Because the holes are already cut, I will someday get the A/C going again!

 

Chris

[TobyB]

...but usually, it's a bolt.

 

There should be 2 bolt- concentric dowels to align the front cover, on the bottom two bolts.

 

Bolts are sometimes less likely to get the water pump/ front cover stuck on them than studs. 

 

Neither is very good.

 

I weld mine on.

 

heh

 

t

 

[PaulTWinterton]

3 hours ago, TobyB said:

There should be 2 bolt- concentric dowels to align the front cover, on the bottom two bolts.

 

Clear as mud.    I'm about to remove the cover.  Maybe I'll understand when it's out.

[TobyB]

You'll find that the lowest 2 8mm bolts have sleeves around them, that act as dowels to locate the front cover.

 

The head uses a similar arrangement to locate it, but the dowels are bigger.

 

Your stud is oddly shouldered for an automotive stud...  studly!

 

hee

 

t

 

[stone02]

Hi,

  that is an actual AC  stud. the reason it looks too short is

because it is installed backwards. the shoulder should hit

the steel block behind the front cover and leave just enough

to get the original bracket, washer and nut on the longer

threaded end. i have removed too many of these in my

time with water pumps. just take it off and put in the correct

replacement bolt if you are not using the old ac bracket.

stone

[PaulTWinterton]

17 hours ago, TobyB said:

You'll find that the lowest 2 8mm bolts have sleeves around them, that act as dowels to locate the front cover.

 

The head uses a similar arrangement to locate it, but the dowels are bigger.

 

Now I get it.  Thanks.

 

14 hours ago, stone02 said:

that is an actual AC  stud. the reason it looks too short is

because it is installed backwards. the shoulder should hit

the steel block behind the front cover and leave just enough

to get the original bracket, washer and nut on the longer

threaded end. i have removed too many of these in my

time with water pumps. just take it off and put in the correct

replacement bolt if you are not using the old ac bracket.

stone

 

That makes sense.   I'm pretty sure this is the first time lower cover removal on this engine.  I can imagine that stud coming out during a water pump replacement and then re-installed backwards.  I will replace with a new bolt.

 

[Posaune]

Sounds like this is answered, but +1 to just replacing with the OEM bolts.  I just dealt with this on my '73. It had AC that I removed and the same studs in your pic.  I tried reusing them but even thought they were torqued properly, they leaked.  I ordered the OEM bolts and it solved the leak.

[ingramlee]

1 hour ago, Posaune said:

Sounds like this is answered, but +1 to just replacing with the OEM bolts.  I just dealt with this on my '73. It had AC that I removed and the same studs in your pic.  I tried reusing them but even thought they were torqued properly, they leaked.  I ordered the OEM bolts and it solved the leak.

Posaune,

 

Would you happen to have the part numbers for the OEM bolts? I just replaced my gaskets and reused these AC bolts and its leaking in this same area.

[Posaune]

54 minutes ago, ingramlee said:

Posaune,

 

Would you happen to have the part numbers for the OEM bolts? I just replaced my gaskets and reused these AC bolts and its leaking in this same area.

I _think_ it was 07119912471

 

It's part #10 on this diagram: http://www.realoem.com/bmw/enUS/showparts?id=ST16-USA-07-1973-114-BMW-2002&diagId=11_2384

And there is a supercession to the number above.