- Posts: 7470
- Thank you received: 2806
Scratches on cam lobes after ~30 km ride
- Nessism
-
- Offline
- Sustaining Member
Please Log in or Create an account to join the conversation.
- zed1015
-
- Offline
- User
- Posts: 3015
- Thank you received: 1548
Yes! The correct name for the bearing inserts are plain bearing shells.Cam shells?
You mean bearings? I just lubed it with engine oil that's all. No special stuff used.
What do you think about 4th cap?
Is the lobe scoring only on the right side of the in and ex cams ?
If so this may indicate a restriction to that side of the head.
This may be caused by dislodged /distorted cylinder head gasket 'O' ring which is causing a restriction around the right rear cylinder stud..
Before going any further you should inspect the condition of the shell bearings in 2 and 4 cam caps.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-
Please Log in or Create an account to join the conversation.
- KZ 1100
-
Topic Author
- Offline
- User
- Posts: 18
- Thank you received: 1
There's one tiny scratch on intake 1 lobe but it may be old.Yes! The correct name for the bearing inserts are plain bearing shells.
Is the lobe scoring only on the right side of the in and ex cams ?
If so this may indicate a restriction to that side of the head.
This may be caused by dislodged /distorted cylinder head gasket 'O' ring which is causing a restriction around the right rear cylinder stud..
Before going any further you should inspect the condition of the shell bearings in 2 and 4 cam caps.
Personally I don't see any oiling problem on cap 2 and I really don't want to mess with it cos the next time I'll be most likely holding on 3 bolts instead of 4.
My only concern with oiling is cap 4. Do you think its oiling looks too bad or it's acceptable?
Please Log in or Create an account to join the conversation.
- zed1015
-
- Offline
- User
- Posts: 3015
- Thank you received: 1548
Do you mean intake lobe 4 as the cylinders are numbered left to right ( lobe 1 is fed from cap 3 on the left)..There's one tiny scratch on intake 1 lobe but it may be old.
Personally I don't see any oiling problem on cap 2 and I really don't want to mess with it cos the next time I'll be most likely holding on 3 bolts instead of 4.
My only concern with oiling is cap 4. Do you think its oiling looks too bad or it's acceptable?
If there really is no recent damage to the righthand side inlet lobes (3 and 4) then there isn't a problem with oiling on cap 4 ..
Also which shims were replaced when you first overhauled the head and were they used, new ,genuine or pattern and if pattern do these correspond to the damaged lobes..
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-
Please Log in or Create an account to join the conversation.
- KZ 1100
-
Topic Author
- Offline
- User
- Posts: 18
- Thank you received: 1
Do you mean intake lobe 4 as the cylinders are numbered left to right ( lobe 1 is fed from cap 3 on the left)..
If there really is no recent damage to the righthand side inlet lobes (3 and 4) then there isn't a problem with oiling on cap 4 ..
Also which shims were replaced when you first overhauled the head and were they used, new ,genuine or pattern and if pattern do these correspond to the damaged lobes..
I meant the first cylinder's exhaust (accidentally wrote intake) lobe.
As I wrote before, there's a bit of damage on third's cylinder intake lobe (inlet lobe 3 as you wrote) but my last question about oiling is regarded to oil pool visible when running the engine without cam cover. Caps 1,2 and 3 have good rich oiling with the "bucket area" underneath the cap is fully filled with oil as well as lobes. Cap 4 and inlet lobe 3 have it a bit worse but they are still lubricated.
I hope it can be seen on photos. I made a video as well but dunno how to post it.
So I'd really appreciate an opinion on how should it look to be good enough to work.
The shims that work with damaged lobes are the old ones. Two of three of them also have a slight but visible scratch.
The new ones made by TourMax I believe. Hard to buy them here and only with 0,1 difference are available like you can buy 2,55 and 2,65 but not 2,50 and 2,60.
Please Log in or Create an account to join the conversation.
- Scirocco
-
- Offline
- Premium Member
- Never change a running system
- Posts: 4166
- Thank you received: 2053
They have the same adjustment range (2,00 -3,20 mm), so go and visit your local BMW shop on monday.
Don´t forget to use assembly lube next time.......
My 1975 Z 1 B 900 Project
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
Please Log in or Create an account to join the conversation.
- asphalt900
-
- Offline
- User
- Posts: 691
- Thank you received: 271
Please Log in or Create an account to join the conversation.
- asphalt900
-
- Offline
- User
- Posts: 691
- Thank you received: 271
hearing a squeal, eminent seizure is on the horizon.
Please Log in or Create an account to join the conversation.
- KZ 1100
-
Topic Author
- Offline
- User
- Posts: 18
- Thank you received: 1
Ran the bike bike without cam cover and oiling was okay even though on 4th cap a little bit weaker. Pulled the cap to check but both of the galleys were perfectly clean and the shells were oiled so I put it back and went for a ride. So far so good.
Big thanks to everyone for the answers!
Btw any "life hack" on how to make fuel cap seal better?
Please Log in or Create an account to join the conversation.
- Scirocco
-
- Offline
- Premium Member
- Never change a running system
- Posts: 4166
- Thank you received: 2053
A new and soft rubber gasket will give the fuel cap a tight fit and will seal the best!
My 1975 Z 1 B 900 Project
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
Please Log in or Create an account to join the conversation.
- Rolf1976_KZ900
-
- Offline
- User
- Posts: 398
- Thank you received: 159
Please Log in or Create an account to join the conversation.
- KZ 1100
-
Topic Author
- Offline
- User
- Posts: 18
- Thank you received: 1
Please Log in or Create an account to join the conversation.