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Old 06-16-2013, 05:12 AM   #1
Stan_R80/7 OP
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Newer ('81+) oil pan on an older (76-80) airhead?

Is a sump/pickup modification needed for installing a newer pan on an older (76-80 model) airhead? I am interested in the 81+ oil pan w/baffle and have read that it bolts right up and prevents any oil light flashing on hard stops. Welding in a baffle for the older pan is an option, but a bolt on pan is more appealing.

I have read that the stock (for my '78) dipstick length is good, which makes me think the oil pickup depth is OK. But, I am not certain. Also, anyone have a link to what a newer pan looks like on a R90/6 or similar?

Also, is there any way to change the title of the post? I can't seem to figure that out.

Stan_R80/7 screwed with this post 06-16-2013 at 07:12 AM Reason: changed years
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Old 06-16-2013, 05:50 AM   #2
Plaka
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Quote:
Originally Posted by Stan_R80/7 View Post
Is a sump/pickup modification needed for installing a newer pan on an older (70-80 model) airhead? I am interested in the 81+ oil pan w/baffle and have read that it bolts right up and prevents any oil light flashing on hard stops. Welding in a baffle for the older pan is an option, but a bolt on pan is more appealing.

I have read that the stock (for my '78) dipstick length is good, which makes me think the oil pickup depth is OK. But, I am not certain. Also, anyone have a link to what a newer pan looks like on a R90/6 or similar?
When you put a deeper pan on you have to use either a deeper pickup or add a spacer to the pickup you have. The pickup screen needs to be right down in the bottom of the pan.

The dipstick measures the top of the oil level, and that doesn't change. So you can use your existing dipstick. You are lowering the bottom (and adding oil capacity) so the pickup needs to be extended to reach down to the bottom. I think you can just go /7 on both pan and pickup and be fine.

I've used a /5 pan on my /7 and a Briel cooler (essentially a big spacer that lowers the pan) with the /5 pickup (for lateral fit reasons) and the aluminum pickup spacer that comes with the Briel. I'm currently still using the Briel but with the original /7 baffled pan, the pickup spacer and the /7 pickup. Not a lot of ground clearance.

Keep an eye on your centerstand crossbar (it can be moved and rewelded) and center stand springs. (mine rub on the sides of the pan)

If you need a pickup spacer you can just make one out of a thick aluminum plate, cut square with 3 holes drilled in it and hand cut gaskets.

All that said, I've never had a /6 pan, so I don't know if it's shallower than the /7 or not. The /5 pan is flat and MUCH shallower than the /7.
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Old 06-16-2013, 06:55 AM   #3
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Has anyone done this?

I have looked into deeper sumps and extend pickups and have two questions:

1. Has anyone put a newer '81+ oil pan on an older /6-/7 airhead?

2. If so, is the pan deeper and does the /6-/7 engine need a longer oil pickup (strainer)?

Edit: looking at the microfiche at Max BMW, it looks like the oil pan changed from the /5 to the /6-7. The baffle was added after /7 models starting in '81. It also looks like a flange was added to the /6-7 strainer, which was probably for a deeper oil pan. So, it is the /6-/7 models. Any R90/6 cafe racers make this mod?

p.s. Thanks for the comments Planka, I changed my post to clarify the question.

Edit II: Found it! Part# 11 41 1 337 536 for the deeper pickup.

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Old 06-17-2013, 03:50 AM   #4
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I have a web page describing the various sumps and the corresponding pickups and dipsticks.
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Old 06-17-2013, 04:59 AM   #5
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Thanks Anton! Is the oil drain plug at the rear of the engine for the '81+ models (i.e. the same general location as the /5/6/7)?
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Old 06-17-2013, 05:03 AM   #6
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Thanks Anton! Is the oil drain plug at the rear of the engine for the '81+ models (i.e. the same general location as the /5/6/7)?
If you look at that page I think it will be clear.
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Old 06-17-2013, 05:34 AM   #7
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Thanks Anton! Is the oil drain plug at the rear of the engine for the '81+ models (i.e. the same general location as the /5/6/7)?
Om my '83 the drain plug is at the center rear of the pan with the face of the plug facing the rear tire.
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Old 06-17-2013, 05:53 AM   #8
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Thanks guys. Looks like I am all set to upgrade my oil pan!
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Old 06-17-2013, 06:01 AM   #9
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Thanks guys. Looks like I am all set to upgrade my oil pan!
Check the new one for flatness. You have granite counters?
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Old 06-17-2013, 06:28 AM   #10
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Will do. I have a granite setup plate and an end mill table to check with. I ordered a new pan (rather than going ebay). But since it is a casting, checking for flatness is a good idea and may save me some aggravation.
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Old 06-17-2013, 07:07 AM   #11
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Will do. I have a granite setup plate and an end mill table to check with. I ordered a new pan (rather than going ebay). But since it is a casting, checking for flatness is a good idea and may save me some aggravation.
Heck, just throw some lapping compound on that surface plate and lap the thing good. Conditions the plate too...


Be sure your oil filter cover is off when you install. Make sure the R. Forward bolt doesn't go up too far and crunch the canister around the filter.
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Old 06-17-2013, 01:17 PM   #12
Plaka
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Btw....

This is the biz end of my new dipstick (bottom) VS the original.

I kept the MAX mark in the same place but dropped the MIN mark to match the deeper sump (because of the thick spacer). So the distance between the marks increases reflecting the greater oil reserve while the min mark still shows oh shit land. The dipstick also goes right to the bottom of the pan, about .85" below the MIN mark. overall the new stick grew 2.2" over the old drecky plastic A one. The distance between the marks went from .85" to 2.4" (rough, using a ruler)

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Old 06-24-2013, 07:24 PM   #13
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It is done. In the off chance my evil twin happens along this thread looking to upgrade his oil pan, here are the BMW part numbers:

07119919143 screw plug
07119963300 gasket ring
11131336995 oil pan (1981+)
11131338427 gasket (oil pan)
07119902993 hex bolts
07119932099 wave washers
11411252226 wire-strap
11411337509 perforated plate
11411337536 intake manifold (oil pickup)
11411256258 gasket

The new oil pan clears the center stand but cannot be removed with the bike on the center stand. Total installation time ~ 2.5 hours. The installation was fairly straight forward with only needing to disassemble the oil pan once after recognizing the wave washers were omitted from the pickup bolts.

Stan_R80/7 screwed with this post 06-24-2013 at 07:33 PM Reason: good->evil. I'm the good one (really).
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