Camshaft "Oil Guides"


Post Reply
jnnngs
ICOA Member
ICOA Member
Posts: 420
Joined: Tue Feb 10, 2015 2:05 pm
Location: Hants/UK
Location: Hants/UK

Camshaft "Oil Guides"

Post by jnnngs »

Hi,

In the outer end of the camshafts, there are supposed to be some rubber inserts (91203-422-005 "Guide, oil").

Working on two CBXs, and both engines have these missing. Is it OK to leave as is, or do I need to replace them?

What do these thing do? I assume they limit the flow of oil in / out of the camshaft?

Paul.

preston
ICOA Member
ICOA Member
Posts: 45
Joined: Wed Feb 17, 2010 10:53 pm
Location: Dunnellon, Florida, USA
Location: Dunnellon, Florida, USA

Re: Camshaft "Oil Guides"

Post by preston »

The camshafts need the oil restrictors in them for proper
pressure to lube the plain bearing surfaces in the head and caps
So yes, replace or make as needed. The hole is 7.5mm.

jnnngs
ICOA Member
ICOA Member
Posts: 420
Joined: Tue Feb 10, 2015 2:05 pm
Location: Hants/UK
Location: Hants/UK

Re: Camshaft "Oil Guides"

Post by jnnngs »

Thanks Preston.

User avatar
shiskowd
ICOA Member
ICOA Member
Posts: 139
Joined: Thu Jun 04, 2020 5:21 pm
Location: Calgary/AB/Canada
Location: Calgary/AB/Canada

Re: Camshaft "Oil Guides"

Post by shiskowd »

I recently pulled apart two engines that haven't been running in some time, both did not have the 'oil guides' in the end of the camshafts that the parts manual shows. I can understand what their purpose is but they seem to be unavailable as a part. What have other come up with as a substitution? Or, is it not worth the effort?
Oil Guide.JPG
You do not have the required permissions to view the files attached to this post.
2022 KTM 890R, 1982 Pro-Link, 1979 CBX 'Z, 1975 Moto Guzzi 850T
Long Sleeping '79 CBX Restoration > viewtopic.php?f=102&t=11699

User avatar
shiskowd
ICOA Member
ICOA Member
Posts: 139
Joined: Thu Jun 04, 2020 5:21 pm
Location: Calgary/AB/Canada
Location: Calgary/AB/Canada

Re: Camshaft "Oil Guides"

Post by shiskowd »

My mistake, the guides are in each crankshaft, I assumed that the hole diameter would be smaller and figured they weren't there. My newbie'ness with the CBX is evident... :doh:
2022 KTM 890R, 1982 Pro-Link, 1979 CBX 'Z, 1975 Moto Guzzi 850T
Long Sleeping '79 CBX Restoration > viewtopic.php?f=102&t=11699

User avatar
NobleHops
ICOA Member
ICOA Member
Posts: 3867
Joined: Mon Jan 25, 2010 7:17 am
Location: Tucson, Arizona, USA
Location: Tucson, Arizona, USA

Re: Camshaft "Oil Guides"

Post by NobleHops »

Don’t push those in any deeper than the edge of that chamfer at the end of the camshaft. We had a bike come in with one pushed in further and it blocked the oiling passage to that cam cap. That cam cap was chocolate brown from overheated oil and the bearing surface was destroyed. The head bearing surface was fine and the cam itself had light scoring we were able to polish. We dug up a replacement, bolted it up and measured it with plastiguage and it was fine. So yes you need them, but only push then in as little as you need to to get them fully seated.
Nils Menten
Tucson, Arizona, USA '80 CBX, sort-of restored :-)

Larry Zimmer
ICOA Web Post/Pix/Video Archive Mgt
ICOA Web Post/Pix/Video Archive Mgt
Posts: 2195
Joined: Mon Dec 15, 2003 2:32 pm
Location: Brighton, MI
Location: Brighton, Mich
Contact:

Re: Camshaft "Oil Guides"

Post by Larry Zimmer »

If you come up difficult trying to find something, this might work: https://coreplugs.co.uk/5-16-mild-steel ... e-plug-mic Whatever solution you find, do be careful about the depth thing.
Larry Zimmer
cbxlarry@sbcglobal.net

User avatar
shiskowd
ICOA Member
ICOA Member
Posts: 139
Joined: Thu Jun 04, 2020 5:21 pm
Location: Calgary/AB/Canada
Location: Calgary/AB/Canada

Re: Camshaft "Oil Guides"

Post by shiskowd »

NobleHops wrote:
Wed Jul 08, 2020 12:46 am
Don’t push those in any deeper than the edge of that chamfer at the end of the camshaft. We had a bike come in with one pushed in further and it blocked the oiling passage to that cam cap. That cam cap was chocolate brown from overheated oil and the bearing surface was destroyed. The head bearing surface was fine and the cam itself had light scoring we were able to polish. We dug up a replacement, bolted it up and measured it with plastiguage and it was fine. So yes you need them, but only push then in as little as you need to to get them fully seated.
I saw that on your Facebook page and was the reason I actually went looking to see where the guides were. Great photo's BTW :-)
2022 KTM 890R, 1982 Pro-Link, 1979 CBX 'Z, 1975 Moto Guzzi 850T
Long Sleeping '79 CBX Restoration > viewtopic.php?f=102&t=11699

User avatar
NobleHops
ICOA Member
ICOA Member
Posts: 3867
Joined: Mon Jan 25, 2010 7:17 am
Location: Tucson, Arizona, USA
Location: Tucson, Arizona, USA

Re: Camshaft "Oil Guides"

Post by NobleHops »

Definitely glad if you found that info useful.
Nils Menten
Tucson, Arizona, USA '80 CBX, sort-of restored :-)

Post Reply

Return to “ENGINES: Maintenance, Performance, Parts Sources”