Leaking Oil Through Te Breather Pipe.

[Serge1952]

Hello
My bike a 1964 Bonneville 650 T120R is leaking oil through te breather pipe. What could be the reason? Can I fit a longer tube who comes aside of the rear mudguard like they do on later models?
Kind regards

 

[Rudie]

How long have you owned the bike?

Do you mean the oil is leaking from the steel pipe beside the final drive gearbox sprocket?

Or 1964 had a rear chain oiler from the primary drive case. This has a tube and a jet, or it can be closed off with a blanking screw. The oil is not "leaking" from this part because the jet or blanking screw has become dislodged?

If the oil is definitely from the steel pipe beside the final drive gearbox sprocket, how much is the quantity? Some oil will always drip from this pipe because the air vented from the crankcase will always contain some small oil droplets.

 

[Serge1952]

The bike i bought recently. The oil leek koms from a little tube as showen in te picture i will add unther nr 8. There is a drip every second.

 

[grandpaul]

You may have worn piston rings which increase compression blow-by, taking some oil with it.

The rubber tube that connects to pipe #8 should run to a "T" fitting, with the direct path going to the top of the oil tank where the oil can return, and the indirect leg of the "T" exiting to the rear mudguard.

 

[Serge1952]

You may have worn piston rings which increase compression blow-by, taking some oil with it.

The rubber tube that connects to pipe #8 should run to a "T" fitting, with the direct path going to the top of the oil tank where the oil can return, and the indirect leg of the "T" exiting to the rear mudguard.

Thank you for the replay. Do you have some pictures of the oil tank? I the T fitting as schown in the picture below?

 

[grandpaul]

Hose #18 goes out to the rear mudguard. Where it connects, the hose coming from under the engine connects on the opposite end of the "T" fitting. The "U-turn" connection goes to the oil tank

 

[Serge1952]

View attachment 49347
Hose #18 goes out to the rear mudguard. Where it connects, the hose coming from under the engine connects on the opposite end of the "T" fitting. The "U-turn" connection goes to the oil tank

Thank you verry much

 

[Rudie]

The bike i bought recently.
There is a drip every second.

Only with the engine running? Or also if the engine is not running?

If you use the Triumph parts book for your bike - https://partsbooks.britishonly.com/partsbooks/20-10182C.pdf - this picture is shown on page 14. There, in addition to tube nr.8, the hose to connect is nr.33. This hose is very difficult to connect to tube nr.8 with the engine in the frame; try to buy hose with a very stiff wall so you can push on it and it does not collapse. Or you might have to remove the bike's fuel tank and battery and lay it on an old mattress to allow access to tube nr.8.

This picture is page 56 of the Triumph parts book.

In the parts list on page 57, part nr.17 has "Part No." E5370 and "DESCRIPTION" '"T" piece'. If you enter "triumph 70-5370" into the internet search you normally use, images (and links to sellers) of part nr.17 as drawn are returned (the image in your post #5 is of a later part).

If you look in the Triumph 1963-1970 650 Workshop Manual - http://classicbike.biz/Triumph/Repair/1970s/70-Triumph-Repair-Manual-63-70.pdf if you do not have it - on .pdf pages 130 and 131/manual pages E5 and E6 are two drawings showing the connection of part nr.17 to hoses nr.16, nr.18 and hose nr.33 from the engine. If the oil tank vent on your bike is to the rear of the filler, part nr.17 and its hose connections are simply positioned to the rear of the oil tank.

Hose #18 goes out to the rear mudguard.

Your bike might have clips for hose nr.18 inside the right hand edge of the rear mudguard; if it does, hose nr.18 should end just below the mudguard's rear edge.

If the mudguard does not have clips, hose nr.18 was routed under the frame tube under the seat, part nr.19 was attached to one of the bolts attaching the "Lifting handle" to the mudguard - parts book page 62, "Lifting handle" is part nr.36, bolts are part nr.16.

Hose nr.18 was then routed between the mudguard and part nr.43, ending just below the bottom of nr.43.

 

[Serge1952]

Only with the engine running? Or also if the engine is not running?


If you use the Triumph parts book for your bike - https://partsbooks.britishonly.com/partsbooks/20-10182C.pdf - this picture is shown on page 14. There, in addition to tube nr.8, the hose to connect is nr.33. This hose is very difficult to connect to tube nr.8 with the engine in the frame; try to buy hose with a very stiff wall so you can push on it and it does not collapse. Or you might have to remove the bike's fuel tank and battery and lay it on an old mattress to allow access to tube nr.8.


This picture is page 56 of the Triumph parts book.

In the parts list on page 57, part nr.17 has "Part No." E5370 and "DESCRIPTION" '"T" piece'. If you enter "triumph 70-5370" into the internet search you normally use, images (and links to sellers) of part nr.17 as drawn are returned (the image in your post #5 is of a later part).

If you look in the Triumph 1963-1970 650 Workshop Manual - http://classicbike.biz/Triumph/Repair/1970s/70-Triumph-Repair-Manual-63-70.pdf if you do not have it - on .pdf pages 130 and 131/manual pages E5 and E6 are two drawings showing the connection of part nr.17 to hoses nr.16, nr.18 and hose nr.33 from the engine. If the oil tank vent on your bike is to the rear of the filler, part nr.17 and its hose connections are simply positioned to the rear of the oil tank.


Your bike might have clips for hose nr.18 inside the right hand edge of the rear mudguard; if it does, hose nr.18 should end just below the mudguard's rear edge.

If the mudguard does not have clips, hose nr.18 was routed under the frame tube under the seat, part nr.19 was attached to one of the bolts attaching the "Lifting handle" to the mudguard - parts book page 62, "Lifting handle" is part nr.36, bolts are part nr.16.

Hose nr.18 was then routed between the mudguard and part nr.43, ending just below the bottom of nr.43.

thank you very much, very helpful.

 

[Serge1952]

Only with the engine running. Isee now that the coplete tube system is missing; thank you very much, very helpful.

 

[keystiger]

I had a Harley that leaked (puked) oil through the breather as well....... spent HOURs-- DAYS even trying to fix the problem consulted several Harley mechanics ...and was told that is "just" what it does"

 

[Serge1952]

I had a Harley that leaked (puked) oil through the breather as well....... spent HOURs-- DAYS even trying to fix the problem consulted several Harley mechanics ...and was told that is "just" what

I had a Harley that leaked (puked) oil through the breather as well....... spent HOURs-- DAYS even trying to fix the problem consulted several Harley mechanics ...and was told that is "just" what it does"