What goes tic tic.......

Got a Tech Question? Know something about BMWs?

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Postby Unity » Wed May 14, 2008 3:46 pm

Flying Monkey. Naaahh, you wouldn't want to be stuck with that name. :wink:

It's very interesting to follow the dissection and get a look at the insides, better than a lifeless diagram. Not too bad for having run without oil.

--John
2002 R1150RT, Silver
Silver, the "cool and aloof" color.
(Road & Track Vol. 56, No.2, p. 19)

1971 Triumph Bonneville, Gold
Gold, the "paying the restorer" color.
(Trust me.)
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Postby guitardad » Sat May 17, 2008 6:37 pm

OK, I've hit the first real snag. I measured the crankshaft journals with a micrometer. Main bearings looked fine - there are two different ranges in the manual, with one range requiring a green marked shell, and the other a yellow. Both of my journals need green shells. Con rod journals look good - measurements go like this:
Left rod - 47.984 mm
Right rod - 47.976 mm
Spec in the BMW factory manual: 47.975 - 47.991 mm
Looks OK, right? But then I get to the parts counter at Bob's, and there are two different shells to choose from. A red and a blue. And the parts fiche doesn't show the different dimensions for them. ](*,) So now I'm searching the Internet for infomation about red and blue shells. Anybody here know?
Chaz
'16 S1000XR "Raquel" - Red, the "energetic and quick-thinking" color
'79 R65 "Hans" - Red also ( I sense a pattern!)
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Postby Anton » Sat May 17, 2008 6:51 pm

Doesn't it say "Cover side: red" and "Rod side: blue"?
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Postby guitardad » Sat May 17, 2008 6:55 pm

No, it just said, "Connecting Rod Bearing Red" or "Connecting Rod Bearing Blue". So I need one of each for each rod, eh? Red one on the cap side, blue one in the rod itself?
Chaz
'16 S1000XR "Raquel" - Red, the "energetic and quick-thinking" color
'79 R65 "Hans" - Red also ( I sense a pattern!)
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Postby Anton » Sat May 17, 2008 6:58 pm

That's what my parts fiche says, but your parts supplier should earn his profit by selling you the parts you need, period. This shouldn't be your problem to figure out.
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Postby guitardad » Sat May 17, 2008 7:01 pm

I agree. Thanks, Anton.
Chaz
'16 S1000XR "Raquel" - Red, the "energetic and quick-thinking" color
'79 R65 "Hans" - Red also ( I sense a pattern!)
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Postby lionlady » Sun May 25, 2008 5:47 am

Hey! It looks like an engine!

P
Ta da!
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Postby guitardad » Sun May 25, 2008 11:45 am

lionlady wrote:Hey! It looks like an engine!

P


Well, I'll let ya'll decide how true that is. But I think it's a lot closer now. Oh, by the way, I do think I had a leaky rear main seal. I could see oily grime seeping thru the seam between engine and transmission. But here's the comparison - one side cleaned, one side as I found it:

Image

So I got home from Bob's with a big bag 'o parts, including a full set of bearing shells for Clifford's engine.

Image

Here are some comparisons of the old to new. You can see holes in the bearing shells - that's where oil is pumped into the bearing by the engine oil pump. The oil forms a thin film between this shell and the crankshaft. The crank "floats" on it - think tiny little hovercraft with a cushion of oil! The rear main bearing also takes the fore-and-aft loads - thrust loads for you engineers out there - on the crankshaft. That's where the wear showed up first. You can really see the wear on the old front main bearing, too.

Image

Image

First order of business was to install the new connecting rods onto the crankshaft. New bearing shells here, too. But there are no holes or grooves in these. Oil is supplied from the main bearings, by flowing thru a hole drilled thru the crankshaft, and then forms another cushion under these shells.

Image

Now the book says torque on the conn rod bolts is "20 Nm plus 80 degrees." 20 Nm isn't much force, and my torque wrench clicked pretty easily. But now, how do you measure that you've turned the bolt 80 degrees more? Simple - with one of these:

Image

More to follow..........
Chaz
'16 S1000XR "Raquel" - Red, the "energetic and quick-thinking" color
'79 R65 "Hans" - Red also ( I sense a pattern!)
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Postby guitardad » Sun May 25, 2008 11:55 am

So next order of buisiness is to install the mains and the cranckshaft. The bearing shells go into the machined haves of the crankcase. You can see the intermediate shaft below the crankshaft bearings. It's turned by a chain, and in turn pulls two more chains that run up to the cylinder heads. Ready for bearings, then bearings in....

Image

Image

You can see I've already oiled the bearing faces - can't have the crankshaft starting to spin dry, before oil starts to flow from the pump! In goes the crankshaft. (This was an earlier pic, from my test fit before the conn rods went on.)...

Image

And then we start to bolt together the two sides of the crankcase. I had a whole zip-lock bag full of bolts: four big 10mm bolts that clamp around the main bearings; four slightly less big 8mm bolts that clamp around the intermediate shaft; and 19 (!) smaller 6mm bolts to hold the rest of the case together. So my first empty bag, and the results....

Image

Image

So is Pam right? Does it look like an engine?
Chaz
'16 S1000XR "Raquel" - Red, the "energetic and quick-thinking" color
'79 R65 "Hans" - Red also ( I sense a pattern!)
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Postby BchrisL » Sun May 25, 2008 12:17 pm

Living my dream man...living my dream. Keep on building! :D
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Postby Maria V » Sun May 25, 2008 12:42 pm

BchrisL wrote:Living my dream man...living my dream. Keep on building! :D


Did you feel that way when he told about the sight glass blowing out? :lol:

I am in awe of Chaz's ability and willingness to tackle this. I read the posts and hear "blah blah engine blah seal blah blah blah oil".
Maria
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Postby BchrisL » Sun May 25, 2008 1:55 pm

Maria V wrote:
BchrisL wrote:Living my dream man...living my dream. Keep on building! :D


Did you feel that way when he told about the sight glass blowing out? :lol:

I am in awe of Chaz's ability and willingness to tackle this. I read the posts and hear "blah blah engine blah seal blah blah blah oil".


I thought and thought about what might cause the sight glass failure. Why did this happen?

I sometimes think about buying a R259 from Beemer Boneyard just tear it down and rebuild it. :lol:
BchrisL
 

Postby Unity » Sun May 25, 2008 2:15 pm

Very nice, Chaz, nice and clean. Clean is good. :D

--John
2002 R1150RT, Silver
Silver, the "cool and aloof" color.
(Road & Track Vol. 56, No.2, p. 19)

1971 Triumph Bonneville, Gold
Gold, the "paying the restorer" color.
(Trust me.)
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Postby Kres » Sun May 25, 2008 3:07 pm

Me thinks' you missed your calling Chaz. :D

You need to open a shop.
-Kres
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Postby Unity » Sun May 25, 2008 3:18 pm

BchrisL will happily work for you. :D

--John
2002 R1150RT, Silver
Silver, the "cool and aloof" color.
(Road & Track Vol. 56, No.2, p. 19)

1971 Triumph Bonneville, Gold
Gold, the "paying the restorer" color.
(Trust me.)
User avatar
Unity
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Location: Reston VA

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