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Leaking right cylendar head
- schrader7032
- Posts: 9081
- Joined: Fri Oct 27, 2006 3:00 am
- Location: San Antonio, TX
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Leaking right cylendar head
What year/model bike are you talking about? [Edit...I see by an earlier post, you're probably talking about your '71 /5].
Exactly where it is leaking from? If it's not clear, thoroughly clean up the engine and go for a ride. Then spread some talcum powder around and see where it sticks.
Are you sure it's engine oil? Could it be gasoline? If it's leaking on your foot, then it's either coming from the carbs or the head gasket area or maybe the valve cover. If it's a /5 or later, then it could be from the cylinder side of the pushrod tubes.
In general, it's not true that they all leak. They only leak if there's something wrong. Find out where it's leaking from and then determine how to fix it. Adding rubber o-rings or gaskets is not the normal fix, unless the existing one is worn out or torn. Mating surfaces need to be flat and the cylinder to block surface usually has small amount of sealant on it. However, things like the valve cover and head gasket are put on with no sealants. If the mating surfaces are warped, the best way to fix it is to have it milled flat.
More information is needed...
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
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- Posts: 6
- Joined: Sun Jun 07, 2009 5:50 pm
Leaking right cylendar head
thanks for your help. Sorry about the misplelling of "cylinders" ijust noticed that.
I will clean it up and ride it. I am sure it is not from the carburator. it is comming from underneath the cylinder abut 4" (in towards the bike) from the covers.
It is a 1971 R75/5
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- Posts: 6
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Leaking right cylendar head
How do i stop this leak?
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- schrader7032
- Posts: 9081
- Joined: Fri Oct 27, 2006 3:00 am
- Location: San Antonio, TX
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Leaking right cylendar head
http://www.realoem.com/bmw/showparts.do ... g=11&fg=20
Anton mentions this o-ring on this page, under the /5 with bushings.
http://www.largiader.com/tech/rockers/
Has there been recent work on the heads? Maybe that's when this started. If it's the o-ring, then it can be changed by removing the rocker arms, one at a time so you don't fully release the head bolt torque.
If that doesn't fix it, you may be able to use some kind of wicking sealant...Loctite makes some...that could be used on the underside to try and stop the leak.
One thing that can cause this to happen also is a procedure which is shown in the various aftermarket manuals. A piece of tube is cut so that it can be used to drive the rings on the pushrod tube up against the pushrod tube seals to make them seal better. What this does is possibly splits the seals, making a real mess, or pulls the pushrod tube out of the head, starting a leak like you describe.
So you could try the wicking sealant, then replacing the o-rings, and finally remove the heads and replace them.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
-
- Posts: 6
- Joined: Sun Jun 07, 2009 5:50 pm
Leaking right cylendar head
- schrader7032
- Posts: 9081
- Joined: Fri Oct 27, 2006 3:00 am
- Location: San Antonio, TX
- Has thanked: 3 times
- Been thanked: 40 times
Leaking right cylendar head
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
Leaking right cylendar head
Am i missing something or should we just try to put a new gasket and seal it for starters?
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