Triumphrat

KD5QOQ

My `99 Adventurer has done something new: After riding into work this morning I noticed a small puddle of oil from the airbox vent hose.
It's been a few thousand miles since I changed the oil so if it were an overfill situation I think I would have seen this before.
Any ideas fellas?

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Jimbo
Kroger Plus Member
99 Adventurer
05YZ450F
89 CR500
81CR250

cafetbird

It is a periodic maintenance item to drain the airbox. A little bit of oil collects there over time from the breather tube. My T-Bird originally had a cap in the tube from the factory, which was to be removed for the drain. At some point, the cap fell out. Perhaps this has happened to yours?

So, I would say this is normal and not to be concerned with.

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Scot Dail, IBA #31553
Pack Member, Charlotte RAT
Old Photo Album : New Photo Album

lovecuba

Is an absolute pig of a design. And, exhausting 'used' engine breath into the air box (prior to the filter element) is even more stupid! Especially if one has a K & N filter fitted.

If oil is running out of the drain tube then the filter is contaminated with engine oil. Why you might ask? Because the hose from the engine crankcase enters the air box at the front (of the box) and the drain is at the rear. Between which is the filter element.
Add to the equation the seal that sits around the breather shaft, the size of a dime and cost of bullion, that is a tenuous part of the system and you have an oil puddle frequently.

The fix. To prevent oil entering air box. In my case paid out a considerable amount for a new seal and breather disc. Followed instructions carefully re fitting seal in particular. No change. Oil still contaminating air box.

Real fix. Blank off inlet into air box (large self tapping screw). Run breather pipe to atmosphere and fit a small K & N glass encased filter to the end of the hose, or inline, to prevent backfeeding of crap into the engine.

No worries now. Clean out glass filter every now and again. I believe that the actual induction of the three carbs. causes such a vacumn in the air box that the sealing qualities of the aforemenioned seal are overcome and oil is actually sucked up the tube along with the shockingly toxic after products of combustion.

This system was designed no doubt to satisfy environmental limitations.

Go too www.britishcycle.com

click on engine breather kits and read up on the Bunn Breather. Mines in the mail.

Good Luck.

jimmyj900

And another good reason for airbox mods...

Jim

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Bronzeback

My new to me '99 Legend I've noticed a few drips from what looks like a breather hose under the bike...not oil though...looks like water?? Haven't traced the line to see what it goes to yet...

RickN

I am so confused .... Why are you installing an $87.60 Bunn crankcase breather kit when you have already installed a K&N filter on the breather hose? Was the filter on the breather hose only a temporary solution or are these two separate issues? Sorry about the dumb questions.

Rick

lovecuba

Yes. Only a temporary fix placing the K&N on the end of the breather hose. All this does is prevent 'crap' from backfeeding into the cranckcase as the engine cools.

As described, the modified breather, will not only accomplish that, but also, allow the crankcase to breath and retain an equal pressure getting rid of toxic fumes into the atmosphere as they occur. I am not into this nonsense of keeping the 'crap' in the sump. As the blurp says, the engine is the heart of our beast, and needs to breath not just via the carbs and blowby, scavange, renew the air in the crankcase makes sense to me.

It appears over the years not much thought has been given to cranckcase ventilation. This view is slowly changing. Triumph owners here in NZ had the benefit at their recent National Rally of hearing Rex explain his ideas on this matter. Now not wishing to sound like a 'Midwest Bible Bashing God Botherer' I have taken on board his rather radical views, and shall preach accordingly.

RickN

Ok, I'm beginning to understand. The kit has two valves: one to exhaust fumes and one to let filtered air into the crankcase. Assuming you would put the filter and inlet valve on the breather hose, where would you put the exhaust valve?

Preach away, that's what makes this forum so informative, for me anyway.

lovecuba

Am going to remove the rocker cover then drill and tap in a suitable spot to allow a 90 degree threaded brass angle to be fitted. To this I will attach the breather hose and Bunn exhaust valve then run the hose down the main spine of the frame along with the other myriad of hoses.

So in effect, the inlet for engine breathing will be via a filter, tube, Bunn inlet valve, tube and then to the crankcase where the existing system exhausts from. Fresh air will enter the crankcase at the bottom flow up across the rotating parts and exhaust from the vent in the rocker cover.

To me, this sounds perfectly logical especially getting rid of the fumes and heat that must accumulate at the high point of any internal combustion engine.

Shall photograph at each stage of fitting and post the hopefully successful results here.