Airhead oil pans

3 Mar 2015 | Author: | Comments Off on Airhead oil pans

BMW Airhead oil pans, sump pickups, and dipsticks

There were two upgrades for road models during the life of the 24x motor. In 1976 the pan was deepened slightly, and in 1981 the pan was deepened substantially and redesigned to include a baffle plate. Dipsticks were lengthened correspondingly, although the cutoff points for them are nowhere near being clear or consistent.

The enduro models retained the shallow oil pan (with threaded bosses for a bash plate), although this was deepened slightly in 1991.

Note: Enduro models for this purpose include not only the G/S and GS, but also the Roadster and Mystik since they had the same configuration.


These are the original combinations which work together properly.

1970-1975 road, early R65, and 1980-1990 enduro

11 13 1 337 330 shallow oil pan (without threaded holes was 11 13 1 251 295, now obsolete)

11 43 1 252 661 metal dipstick with 247mm MAX mark for early bikes (now obsolete)

11 43 1 337 543 B plastic dipstick on later bikes

11 41 1 252 223 steel pickup head w/16mm bolts

1976-1980 road

11 31 1 262 723 deeper pan

metal dipstick with 255mm MAX mark in ’76 and some ’77

metal dipstick with 260mm MAX mark starting ’77 or ’78

11 41 1 262 971 extension for use with 223 head, for /6. 12mm phenolic. Functionally obsolete. 28mm bolts

11 41 1 265 590 extension for use with 223 head, for /7. 10mm aluminum. 28mm bolts.

1981-on road

11 13 1 336 995 deepest oil pan, with baffle

metal dipstick with 260mm MAX mark on some bikes

11 43 1 337 542 A plastic dipstick on some bikes


11 41 1 337 536 44mm cast pickup head w/50mm bolts

1991-on enduro (inc. R Mystik)

These used a 1/2 deeper pan with the drain hole in the rear wall, possibly to work better with the PD bash plate. The dipstick has the same length and MIN marking as the earlier GS one, but the MAX mark is lower. A baffle was added inside a new, shorter cast pickup head.

11 13 1 338 620 oil pan

11 43 1 338 635 C dipstick

11 41 1 338 632 33mm cast pickup head w/40mm bolts

11 41 1 338 634 baffle inside pickup head


Early pans were shallow with no baffle. These used a simple metal pickup head.

In 1976 they were deepened, and a 10mm spacer was used to lower the pickup head. Dipsticks were lengthened correspondingly.

In 1981 they got slightly deeper still, with a baffle at the front to keep oil close to the pickup head during moments of brief deceleration. This design used an all-new one-piece cast aluminum pickup. Same dipstick as before, but now with a plastic handle.

The G/S and GS (along with the R and Mystic) always had shallow oil pans. 80-90 models were dimensionally identical to the /5 (except they had threaded holes to mount a bash plate), while ’91-’95 models had a 1/2 deeper, smooth-bottom pan with a lower MAX mark on the dipstick. The shallow pan with the threaded holes is now the replacement for the /5.


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