Oil Disappearing
- Thread starter Snortin Vache
- Start date
-
- Tags
- burning oil leaking oil
Brit Bike's that suffer from excessive crank case pressure can be a slight challenge to keep oil tight 
- Joined
- Aug 19, 2021
- Messages
- 1,391
My '74 MK II was using a quart of oil every 300 miles with no significant smoking. There was however evidence of oil being sucked into the intake port on the starboard cylinder.
concours
VIP MEMBER
- Joined
- Dec 29, 2011
- Messages
- 8,805
Izzit back together Dan?
- Joined
- Aug 19, 2021
- Messages
- 1,391
Slowly but surely I'm inching my way towards that goal. I had to get some valve seat cutting tools so I focused on several minor issues. Every 30 minute job turns into weeks as parts or tooling are acquired. I'll get there.
Tornado
VIP MEMBER
- Joined
- Dec 5, 2017
- Messages
- 4,551
So oil must have been burning. Perhaps no visible smoke has to do with type of oil being used. Or perhaps the smoke happens at specific moments on rides, goes unseen by anyone.
If a Norton smokes at speed and no one sees it, does it make a stain?
- Joined
- Mar 25, 2023
- Messages
- 31
Last weekend I went on a ride with a friend and through several iterations of laying off the throttle while coasting in gear and then opening it up, he told me he did not see any smoke. Not sure how much I trust his eye sight, but what can you do. Because my right plug gets oily, I am sure I am burning oil at least some of the time, but it is safe to say that there is no obvious smoking.
On the other hand, I was talking to the shop where I bought the bike and he recommended I install a PCV valve. Now I have read a little bit about it, but like many of the topics presented to the uninitiated, I am not sure how much of it I have actually understood. I have noticed oil dripping from my breather when parked, so perhaps I am losing some here. How much could oil could be puking out the breather during running?
Should this valve be inline on the breather going up to the oil tank? Or inline on the hose from the oil tank vented down to the right side of my bike? Or on the sump plug?
On the other hand, I was talking to the shop where I bought the bike and he recommended I install a PCV valve. Now I have read a little bit about it, but like many of the topics presented to the uninitiated, I am not sure how much of it I have actually understood. I have noticed oil dripping from my breather when parked, so perhaps I am losing some here. How much could oil could be puking out the breather during running?
Should this valve be inline on the breather going up to the oil tank? Or inline on the hose from the oil tank vented down to the right side of my bike? Or on the sump plug?
Tornado
VIP MEMBER
- Joined
- Dec 5, 2017
- Messages
- 4,551
This is the one many here use:
PCV Reed Valve - Crankcase Breather
Color/Finish: Silver Material: Metal Dimensions: Overall Length: 86.50mm Width (at widest point): 28.85mm Engine Inlet OD: 14.15mm Engine Inlet 11.85mm Filter (Air) Outlet OD: 12.00mm Filter (Air) Outlet ID: 9.45mm Fits: Universal Note: Easy Installation (Linked Below)
www.mikesxs.net
I fit mine to the hose coming off the timing case breather barb and pipe its output up to the oil tank breather connection. Helps with various pressure related seeps/weeps from places like the rocker covers etc.
If money is not a concern, there in the CNW or Holland Norton Works sump breather, which replaces the large sump drain plug on 850 engines only....hose pipe runs up to tank breather connection. These run $200-$300 USD last I checked....
- Joined
- Dec 28, 2009
- Messages
- 5,151
Cheap , spend the money , do the somewhat awkward connecting / routing of it . You may need some extra hose and a couple of clamps . Cables ties too . Mikesxs.com sells it cheap .This is the one many here use:
PCV Reed Valve - Crankcase Breather
Color/Finish: Silver Material: Metal Dimensions: Overall Length: 86.50mm Width (at widest point): 28.85mm Engine Inlet OD: 14.15mm Engine Inlet 11.85mm Filter (Air) Outlet OD: 12.00mm Filter (Air) Outlet ID: 9.45mm Fits: Universal Note: Easy Installation (Linked Below)
I fit mine to the hose coming off the timing case breather barb and pipe its output up to the oil tank breather connection. Helps with various pressure related seeps/weeps from places like the rocker covers etc.
If money is not a concern, there in the CNW or Holland Norton Works sump breather, which replaces the large sump drain plug on 850 engines only....hose pipe runs up to tank breather connection. These run $200-$300 USD last I checked....
- Joined
- Aug 19, 2021
- Messages
- 1,391
Works for me.This is the one many here use:
PCV Reed Valve - Crankcase Breather
Color/Finish: Silver Material: Metal Dimensions: Overall Length: 86.50mm Width (at widest point): 28.85mm Engine Inlet OD: 14.15mm Engine Inlet 11.85mm Filter (Air) Outlet OD: 12.00mm Filter (Air) Outlet ID: 9.45mm Fits: Universal Note: Easy Installation (Linked Below)
I fit mine to the hose coming off the timing case breather barb and pipe its output up to the oil tank breather connection. Helps with various pressure related seeps/weeps from places like the rocker covers etc.
If money is not a concern, there in the CNW or Holland Norton Works sump breather, which replaces the large sump drain plug on 850 engines only....hose pipe runs up to tank breather connection. These run $200-$300 USD last I checked....
- Joined
- Dec 28, 2009
- Messages
- 5,151
Yup , that's the baby .Works for me.
Mine routes more to the right side . As long as it's away from the battery terminals .
- Joined
- Aug 19, 2021
- Messages
- 1,391
Since I'm still running + ground, the proximity to the + battery terminal doesn't really concern me.