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phil.wales
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I have a 1927 R42. Does anyone know where I can pick up a manual?

Also I have seen on the this website that it takes greese in the gearbox however the gentleman I purchased it from said it takes 20/50 mineral oil. Is either ok?

Bruce Frey
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You should be able to find a

You should be able to find a Handbuch and Ersatzteilliste on eBay.de. These will be in German, however. I don't think there was ever an English version for the R42.

I believe the "grease" they refer to is actually a heavy oil like that used in the lower units of outboard motors. From "grease" they went straight to motor oil for transmissions in the following years.

Accordingly, the mineral oil recommended by the PO, any decent motor oil or GL4 rated gear lube should work.

Cheers,

Bruce

phil.wales
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Thanks Bruce

Thanks Bruce

Barry Robin
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So Bruce-which is quieter,

So Bruce-which is quieter, "grease" or oil? My R11's tranny makes an awful racket..

and by the by...since when are you no longer in milan?

-b.

Peter
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Hi Phil, the manual is

Hi Phil, the manual is available, the introduction is in English and the remainder is German although a lot is easily understood. Grease is better in my opinion.

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Ian R11
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oil v grease

From conversations with an R47 owner (same gearbox as R42), he uses “oo” spec liquid grease.

re R11 gearbox, he also uses same grease in his similar R62 box and strongly recommends I do the same.
But….. R62 handbook says put oil same as engine in the box. It has oil in at the moment but is not road test ready and only running on it’s stand so not really tried the gearbox.

Other points that make me unsure but would like answers or peoples experience of….…. If there are there particles floating around in the gearbox, would grease keep these suspended unlike oil that allows them to drop to the bottom? Would the gear change become a lot slower due to more drag when the gears change? If you use grease will it easily drain out when needed?

fritsen
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I use in my R11 gearbox and

I use in my R11 gearbox and rearwheeldrive sae 140 gl4 oil for year now without any trouble. gr. fritsen.

Bruce Frey
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R24 Transmission Lube

Barry Robin wrote:

So Bruce-which is quieter, "grease" or oil? My R11's tranny makes an awful racket..
and by the by...since when are you no longer in milan?
-b.

Since lubricants are relatively inexpensive and the quantities we use are small, I would experiment to see if one is quieter than the other. Another tip I received a long time ago was to add 1oz of Militec lubricant (Google on it) to the transmission and engine oil. I did this to my R6 shortly after I purchased it and it did seem to quiet the transmission a bit (it could also have been a placebo effect).

After 15 years in Europe, I returned to the USA last year. After a week back in Houston, I was sent to Sao Paolo, where I worked on projects for much of 2011. 2012 finds me in Calgary. At least my time zone differential is much less!

Cheers!

Bruce

Barry Robin wrote:

So Bruce-which is quieter, "grease" or oil? My R11's tranny makes an awful racket..

and by the by...since when are you no longer in milan?

-b.

Barry Robin
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VBMWMO #52
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now THIS is what i call a highjacked thread!

"2012 finds me in Calgary. At least my time zone differential is much less!"

i guess i can't quite say "welcome back to the sates". i dunno-welcome back to north america?; it'll have to do. and calgary's not a bad place to be staying...

so back to business, in an off-topic kind of way...: i always wondered why the prewar experts always say to use grease in the tranny-if so, why did BMW include a pour spout as standard? to give people a choice?

poor phil in wales. we've hijacked his thread, i fear.

hi phil-welcome to the club.

-b

Darryl.Richman
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Surf City, USA (Santa Cruz, CA)
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BMW switched from grease to

BMW switched from grease to oil with the introduction of the R52/R57/R62/R63 models in 1928. I don't believe that there's a drain plug on earlier transmissions, only a fill plug.

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Barry Robin
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VBMWMO #52
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thanks for info, darryl. i

thanks for info, darryl.
i think we should have a straw poll: what's quieter, grease or oil? and if oil, which weight? in the bay area, and santa cruz too, i'd imagine, the rule of thumb would be to use the thickist weight sludge available.
i dunno-90wt?

-b

Darryl.Richman
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My R52's trans has always

My R52's trans has always whined, and not a little bit. Some in second and quite a bit in third, at least until it gets into the higher engine revs (nearing 4k). I attribute this to the straight cut gears. Peter Nettesheim told me that all of the bikes he has had from this era, save one, all whined to some extent. It would be nice to know what was different about the bike that was quiet...

I would guess that a grease filled trans would be much quieter than any oil filled one, but would also suck up some of the power from the engine. There's not really a lot to spare here, so I guess I will continue to live with the whine.

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Barry Robin
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well said. -b

well said.

-b

Ian R11
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Yorkshire uk
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The whine on my bike reduced

The whine on my bike reduced a little when I re shimming the rear crown and pinion gears, obviously some noise travels from these. Straight cut gears are noisy, remember the sporty Mini’s from the 60’s and 70’s with the stronger straight cut boxes? In my youth they were something to be proud of and would pay extra to have the car with the whine. Well, times have changed and I have now paid extra for some sae 140 to try in the R11 when I get chance.

bmwmyplace
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Australia
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I wonder if peter with the

I wonder if peter with the R42, R12, R51/3, R69S Could you contact me . I cant seem to find away to send you a PM .. 07 3289 2008 or gibbsp(AT)bigpond.net.au kind regards Peter G

brown3459
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my experience is that grease

my experience is that grease in gearboxes is not a good idea. then gears quickly cut a "trough" and run unlubricated.
I run a racing "quickchange" differential in my old truck and I add a small amount of molybdenum disulphide which
quietens things right down. Been running it for 30 years with no problems.

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bmwmyplace
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I did quite some research on

I did quite some research on this 10 years ago , but cant remember my sources, I think Peter N contributed to it but the gist of it was that If it had no drain plug then it was designed to run grease, NO not the thick stuff you put in the grease gun.

I was able to find an equivalent of the grease specified , where I got the specs from I cant recall, It may have been from my 1927 AJS book as they also ran grease... anyway...... but Mobil said it was still available and was now called MOBILX EP 023 semi liquefied grease

It is still runny like molasses so chips will sink as someone asked and as a result helps when changing gear . Up changes are easy and clean as long as you do them very fast down changes are easier if you leave a little throttle on and estimate the eng rpm in the next lower gear, it just slips right in… for what it is worth cheers P

bmwmyplace
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OOPPS sorry forgot this from

OOPPS sorry forgot this from Mobil there is more if you want to read about it cheers P

Mobilux EP 023 are particularly suitable for the lubrication of enclosed gears and bearings in poorly sealed gear cases on most underground mining machinery with the exception of electric motor gearings. Mobilux EP 004 and Mobilux EP 023 can also be used in many other industrial applications where conventional gear oils cannot be retained in equipment such as gear cases, chain cases, because of leakage due to worn or missing seals. Mobilux EP 004 passes the SEW 1008 hour gear test requirement DR.EM.203 mod.

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