Posted by Rob Kleinschmidt on October 20, 2008, 7:10 pm
Traditional OHV BMW boxer engine which recently
developed a dribble of oil on one pushrod tube.
Replacing the rubber seal would probably mean
pulling the head and cylinder barrel to put the seal
in place, then replacing some O rings at the cylinder
base plus a head gasket then reassembling and
retorqueing the whole mess. Doable, but a PITA.
and probably a big chunk out of a Saturday.
I read one account where the owner had managed
to wrap plumbers string between the pushrod seal
and the lip in the pushrod tube to add some pressure
to the seal.
Anybody else tried this or any other wuick repair
technique ? If it did nothing more than fix the drip
for a few weeks until I found the time for a more
permanant solution, it would still be a very worthwhile
fix to me.
Posted by The Older Gentleman on October 20, 2008, 11:26 pm
> Anybody else tried this
I've used plumber's tape (PTFE tape, we call it) on oil unions on a
Guzzi. It worked. Never tried it on a pushrod seal, but I can't see
you've anything to lose.
--
BMW K1100LT Ducati 750SS Yamaha XT600E Honda CB400F
chateau dot murray at idnet dot com
"What you're proposing to do will involve a lot of time
and hassle for no tangible benefit."
Posted by Timo Geusch on October 21, 2008, 6:22 am
> Traditional OHV BMW boxer engine which recently
> developed a dribble of oil on one pushrod tube.
They all do that sir and if it's a 90 or a 100, it'll do it again very
soon.
> Replacing the rubber seal would probably mean
> pulling the head and cylinder barrel to put the seal
> in place, then replacing some O rings at the cylinder
> base plus a head gasket then reassembling and
> retorqueing the whole mess. Doable, but a PITA.
> and probably a big chunk out of a Saturday.
It's not that bad - the last time I had to do it on an R80 it was
something like 2-3 hours IIRC. Well, either that or I was caught in a
beer-induced time warp.
> I read one account where the owner had managed
> to wrap plumbers string between the pushrod seal
> and the lip in the pushrod tube to add some pressure
> to the seal.
It'll probably work if you can get it in deep enough (fnar).
> Anybody else tried this or any other wuick repair
> technique ? If it did nothing more than fix the drip
> for a few weeks until I found the time for a more
> permanant solution, it would still be a very worthwhile
> fix to me.
Unfortunately if it's one of the bigger twins it'll only be
semi-permanent as they all seem to start dripping sooner or later.
--
Morini Corsaro 125 | CB450K4 | XL250 Motosport | 900SSD | R1150RT
Laverda SF2 | Harley FXD BOTAFOF #33 TWA#10
The UKRM FAQ: http://www.ukrm.net/faq/index.html
"Je profite du paysage" - Joe Bar
Posted by Rob Kleinschmidt on October 21, 2008, 2:24 pm
wrote:
> > Traditional OHV BMW boxer engine which recently
> > developed a dribble of oil on one pushrod tube.
> They all do that sir and if it's a 90 or a 100, it'll do it again very
> soon.
I've actually had pretty good luck to this point.
High mileage R100GS. First pushrod drip of
this size that I recall. Possibly because it's recently
been fixed to the point where the other drips
are pretty well gone. This is a spoonfull or so
overnight.
> It's not that bad - the last time I had to do it on an R80 it was
> something like 2-3 hours IIRC. Well, either that or I was caught in a
> beer-induced time warp.
> > I read one account where the owner had managed
> > to wrap plumbers string between the pushrod seal
> > and the lip in the pushrod tube to add some pressure
> > to the seal.
> It'll probably work if you can get it in deep enough (fnar).
Took a shot at it this morning using ordinary cotton
string. I'll see how it fares. This may be the result of
some recent abuse where the bike got run hotter than
usual.
> Unfortunately if it's one of the bigger twins it'll only be
> semi-permanent as they all seem to start dripping sooner or later.
Ever try Hylomar or some other non-hardening
sealant ? Seems like it might be worth trying.
Thanks
Posted by Timo Geusch on October 21, 2008, 2:48 pm
> wrote:
>> > Traditional OHV BMW boxer engine which recently
>> > developed a dribble of oil on one pushrod tube.
>>
>> They all do that sir and if it's a 90 or a 100, it'll do it again very
>> soon.
> I've actually had pretty good luck to this point.
> High mileage R100GS. First pushrod drip of
> this size that I recall. Possibly because it's recently
> been fixed to the point where the other drips
> are pretty well gone. This is a spoonfull or so
> overnight.
Fair enough. That's quite a lot, actually. IME once they go past "damp"
you're looking at "torrential" quite soon.
>> It's not that bad - the last time I had to do it on an R80 it was
>> something like 2-3 hours IIRC. Well, either that or I was caught in a
>> beer-induced time warp.
>> > I read one account where the owner had managed
>> > to wrap plumbers string between the pushrod seal
>> > and the lip in the pushrod tube to add some pressure
>> > to the seal.
>>
>> It'll probably work if you can get it in deep enough (fnar).
> Took a shot at it this morning using ordinary cotton
> string. I'll see how it fares. This may be the result of
> some recent abuse where the bike got run hotter than
> usual.
That certain did the oil seal no good, but then again they're not
exactly built for eternity anyway.
>> Unfortunately if it's one of the bigger twins it'll only be
>> semi-permanent as they all seem to start dripping sooner or later.
> Ever try Hylomar or some other non-hardening
> sealant ? Seems like it might be worth trying.
It's worth a try and I doubt it would do any harm. "Common wisdom" has
it that BMW stretched the engine a little too far when they went over
800cc and it seems that the thermal stresses conspire to turn the bike
into an oil dispenser.
--
Morini Corsaro 125 | CB450K4 | XL250 Motosport | 900SSD | R1150RT
Laverda SF2 | Harley FXD BOTAFOF #33 TWA#10
The UKRM FAQ: http://www.ukrm.net/faq/index.html
"Je profite du paysage" - Joe Bar
XML Sitemap