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dBDawg
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VBMWMO #8575
Joined: 01/18/2013
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Does anyone have any info on doing a valve job for an R11/R62 engine? I have to get the cylinders worked on and want to possibly put valve sleeves, seals, and replaceable seats in it. Anyone done that?

If not, does anyone know what the tolerances on the valve stems should be?

Also, does anyone have the parts book page to this section of the motor? My book is 200mi away and I haven't had a chance to look and see if all the parts are actually there for this part of the bike.

Thanks

brown3459
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maybe this will help

maybe this will help

  • r11_cylinders_2.jpg
  • r11_cylinders_1.jpg
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Barry Brown
Canada

Ian R11
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Yorkshire uk
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Photo showing the part Barry

Photo showing the part Barry Robin is looking for. Also valves in place showing springs etc. The parts book doesn’t show the guides or seats as separate items. You can see the guides protruding under the springs. Mine are steel but maybe bronze guides would be good.
I don't know the clearances, I left that to the machine shop.
Would be interesting to know what others have done before you go forward with the job.

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bmwmyplace
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Australia
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I dont believe the original

I dont believe the original engine had either separate guides or seats, they were part of the barrel , separate seats and guides were only used after many years of work when the original cast in one failed. as a young man I can remember lapping and grinding many valve seats that were just part of the original casting, and using over size valves to accommodate the wear in the guides, MY low mileage R12 has no seats or guides cheers Peter

VintageSalesand...
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VBMWMO #7368
Corona, CA
Joined: 03/24/2008
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Oversize Valve stems

Hi,

Wolfgang at RRC Tuning sells several valves with oversized stems for this. You ream the existing guide to size and the new "fat" valve stem is a perfect fit. The seats are part of the barrel casting.

Jeff

dBDawg
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Thanks for the replies, guys.

Thanks for the replies, guys. I appreciate all the input so far. Half the problem is finding a shop that will handle it all, but I've finally narrowed one down. I'm Definitely interested in putting in the guides and seats even though they're not originally part of the assembly.

Jeff, thanks for mentioning RRC. I've never come across these guys.

Ian and Barry, I definitely do not have that final drive nut in the pic. If Ian cares to draw it up, as I know he's great at doing, I'd be happy to spin two off...

brown3459
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I think the BMW engineers

I think the BMW engineers were brilliant to not use removable seats and guides thus obviating any possibility of them coming loose and avoiding thermal gradients. Just my 2 cents , I am not an engineer.

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Barry Brown
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Darryl.Richman
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Surf City, USA (Santa Cruz, CA)
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After I bought my R52 10

After I bought my R52 10 years ago, I had a machine shop install valve guides, but did not have seats installed. In part because it was expensive, and also the cylinders were in pretty good condition and didn't need extensive work to seat the valves, but also because it wasn't clear to me how well steel seats could be shrunk into the cast iron, since their rates of expansion are so similar (vs. shrinking steel seats into an aluminum head).

Besides, the consequences of a valve being stuck open on a sidevalve motor aren't so terrible.

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Ian R11
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VBMWMO #8148
Yorkshire uk
Joined: 10/22/2011
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From the photo I have seen of

From the photo I have seen of your cylinder, the valve seat area is in poor condition and fitting seats may be your only option. Keep us posted on what the shop suggests.

Barry Robin
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VBMWMO #52
San Francisco, Ca.
Joined: 10/27/2006
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Hey Ian- whatty'a think of

Hey Ian- whatty'a think of drawing up that dustcap I was looking for and having dbdawg make one up for me?

-b

dBDawg
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It took 9 months to have

It took 9 months to have these cylinders repaired but they're back!!! The guys at Midwest Cylinder and Machine here in the states did a great job. They were great to deal with and very thorough tho a bit laid back. haha but I'm in no rush. I am a little nervous because obviously this stuff is old as $&% and because one cylinder was cracked (and horribly repaired) but there's no point in not having faith now. The valves have seats (the crack was right on the seat) but no guides. It was sleeved and all the fins were repaired too. I put some before and after shots but it doesn't do the work justice. Keep your fingers crossed for me.

Not sure how some of you guys finish your restorations so quickly but at this pace I probably won't have this going until next year.

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