O&R engine serial numbers.

dgundling Mon Aug 30, 2021 3:55 pm

Does anyone know if the serial number on old O&R engines contains any information such as year of manufacture and displacement.

Thanks.
Dave

crankbndr Mon Aug 30, 2021 4:58 pm

I do not think so, but with a photo or two might could ID it by its features in the reference manual.

Ken Cook Mon Aug 30, 2021 6:29 pm

I'm not responsible for the making of this list, I remembered it from years back and saved it. I'm a big O&R fan.

O&R 60
1940 Custom W/cast tank top & roller brgs. #114 to 541
1941 Special W/common tank & BB only #1228 to 4675
1942 Special as above #5998 to 10654
1945 & 46 Special as above #10843 to 030971
1947 Special no beam mount lugs on case. Radial mount only or use opt. sht. metal mtg. unit . New castings W/ larger exh.& by-pass ports. All prior models had open slot mounting lugs.
#047628 to 054033
1948 Mounting lugs back & have holes in mounting lugs. All else same as 1947 #055749 to 067219
1949 Staked on alum. head W/1/4" instead of old 3/8"plug, no tanks.
Last of the .60 sideport engines #073145 to 077766
1950 on is FRV 1st production natural alum. head. No tank, 1/4" plug #078891 to 080830
on to # 081742 Purple.

O&R .19, .23, .29 & .33
1938 Plain , un painted head, sideport W/tank & slotted mtg. lugs
.19 #678 to 9460
.23 #2241 to 6701
1940 to early 1946 Painted black head.. .19 #9461 to 10438
.23 #15912 to 053533
1946 All same characteristics. No .19 engines made
.23 #071568 to 077741
1947 No beam mounting lugs. Radial mount. Larger ports & exhaust .19 #017202 to 029892
.23 #097653 to109139
1948Holes in mtg. lugs & staked on alum head. Also FRV
Sideports .19 #034703 to 034811
FRV .19 #406849 to 433682
Sideport .23 #130800 & on
FRV .23 #211781 to 505889
These # are through the end of production about 1953 under Harry Rice as Irvin Ohlsson left the company in 1949

1949 & on .29 #002700 to 059457
Early production had silver staked on alum. head & rubber cyl. gasket. Rice prod. had blue anodized head & alum gasket. These blue head models were de-tuned to prevent cyl. separation from the crankcase.
1950 & on .33 with red head on all prod. .33 #044830 & on
These engines were also de-tuned for the above same reason .

getback Tue Aug 31, 2021 7:35 am

That's Impressive , Kudos to the one that did make the list . If you keep telling me your a fan of the O&R Engines I am going to end up owning one LOL This Site Rocks!

dgundling Tue Aug 31, 2021 11:15 am

Thanks for the info.

Dave

Bluzman23 Wed Aug 03, 2022 9:49 am

I have a O&R 60 that was given to me when I was a kid from a family friend who was into model planes and such. I never used it. It sat in a box with some original paperwork and what looks like paperwork from other related things. I have had it about 42 years I’m thinking.
The serial number is 073038. Trying to just confirm it’s age. I read the post from Ken Cook with the numbers but something wasn’t matching up. Not sure if it’s from 1949 or maybe 1948.
Any help would be great.
I have pictures just tr

Ken Cook Wed Aug 03, 2022 2:55 pm

The glow plug was invented in late 1947. Seeing that your engine still has a ignition timer , your model is earlier. Once the glow plug was invented, that changed the hobby. O&R sold two types of conversion kits. You could convert the engine from a side port to a front rotary valve and you plugged the side of the case with a cork.

They also sold a kit to delete the front timer assembly. A cover took it's place when removed and you ran it on a glow plug.

I believe the .60 had quite a few years of production starting from about 1941.

getback Thu Aug 04, 2022 6:17 am

You may want to check this out and you can ask in the Question box , i have read all i can and looked can't find a for sure answer . Good read to .. https://www.fabtintoys.com/ohlsson-rice/

Bluzman23 Sun Aug 07, 2022 7:48 am

Thanks for the info

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O&R engine serial numbers.

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