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Author Topic: Cams not getting oil  (Read 1633 times)

Offline cxman

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Re: Cams not getting oil
« Reply #10 on: May 18, 2017, 16:22:06 »
i take the side cover off pull the electric sending unit

screw in a mechanical test gauge and start it up and see what the oil pressure is

that should have been step one

i would not think past that till you even see if it has pressure

it may not be pumping oil period
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline Joseph New York

  • Posts: 90
Re: Cams not getting oil
« Reply #11 on: May 19, 2017, 16:11:36 »
The're tell'n me 4-5lbs at idle. Of corse the head wouldn't get oil.

I'm just going to tow her home and rebuild it myself. It has a head gasket leak so it will have to be done anyways.

I'll post back once I find out what's going on in a few weeks, thanks for y'all help.
CB(500/4|650|750|750/DOHC)
Norton Atlas
Suzuki Savage bobber

Offline esmoojee

  • Posts: 166
Re: Cams not getting oil
« Reply #12 on: May 20, 2017, 10:01:02 »
Have you cleaned your pick up screen?  It could be blocked and the passage from the screen body is narrow.  There is a mod from a member on the cb1100f.net site that sells modified screens to allow more oil to flow through.  Your oil pipe could be blocked as well.  It delivers the oil from the case to the head.  Itís the s shape pipe on the outside of the case.  Iíd try these first.  Youíll have to drop your pan to inspect the pickup screen but it may be worth it. 

Offline teazer

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Re: Cams not getting oil
« Reply #13 on: May 20, 2017, 11:42:47 »
What is stock tickover pressure specification?  That sounds really low.

If it's as low as it sounds, teh reasons could be blocked inlet or a spun bearing that's allowing oil to just piss out back into the sump.

Offline Joseph New York

  • Posts: 90
Re: Cams not getting oil
« Reply #14 on: May 20, 2017, 12:38:55 »
Have you cleaned your pick up screen?  It could be blocked and the passage from the screen body is narrow.  There is a mod from a member on the cb1100f.net site that sells modified screens to allow more oil to flow through.  Your oil pipe could be blocked as well.  It delivers the oil from the case to the head.  Itís the s shape pipe on the outside of the case.  Iíd try these first.  Youíll have to drop your pan to inspect the pickup screen but it may be worth it.
I haven't. During my rebuild I'm cleaning everything. I'll look into that aftermarket screen, thanks. Without the bike in front of me, I totally forgot about that external pipe, interesting.

What is stock tickover pressure specification?  That sounds really low.

If it's as low as it sounds, teh reasons could be blocked inlet or a spun bearing that's allowing oil to just piss out back into the sump.
Yes, I think that's super-low. All I was told from the shop is it was 5-6 at idle and that's all I needed to know before deciding to take it back from em. Once I get her in my garage, I'm checking oil pressure, reviewing oil pan/filter, running compression and leak down test, then disassembly, remove all carbon, replacing all gaskets, adjust valves, etc. I've never inspected the cause of low oil pressure, any tests or reviews I should preform to find the culprit, before disassembly, and after?

Guys, on a side note, I'm suspecting the shop didn't check the oil pressure (I could be wrong) but during my call with them, we talked about causes of the dry cam. Then I asked about the oil pressure and he said it was very low. If the oil pressure was low, why would we even be discussing why the head wasn't receiving oil?
CB(500/4|650|750|750/DOHC)
Norton Atlas
Suzuki Savage bobber

Offline cxman

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Re: Cams not getting oil
« Reply #15 on: May 20, 2017, 16:39:58 »
like i said you had the wrong shop

60 psi is about the relief pressure

i would expect around 20 psi hot idle 30-40 cold idle
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline esmoojee

  • Posts: 166
Re: Cams not getting oil
« Reply #16 on: May 20, 2017, 19:14:07 »
From what I read on the cb1100f.net forum you want about 10psi at idle and 80 when riding.  Check your oil pressure relief valve as well.

Offline Joseph New York

  • Posts: 90
Re: Cams not getting oil
« Reply #17 on: May 21, 2017, 15:12:03 »
like i said you had the wrong shop

60 psi is about the relief pressure

i would expect around 20 psi hot idle 30-40 cold idle
Once I get it out of there I'll be happy. Wow that high, hu?


From what I read on the cb1100f.net forum you want about 10psi at idle and 80 when riding.  Check your oil pressure relief valve as well.

The shop told me they'd want around 12 idle, I'll find out soon enough what the pressure is and go from there. The fact that the bike has been running for as long as it has with low pressure (so they say), dry cams, and a leaking head and valve cover gasket, is nothing short of a miracle. Y'all wouldn't believe what this bike has been through.

Just ordered gaskets, not sure what else I will be needed, will be my first DOHC motor build. Shim over bucket  :o
CB(500/4|650|750|750/DOHC)
Norton Atlas
Suzuki Savage bobber

Offline cxman

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Re: Cams not getting oil
« Reply #18 on: May 21, 2017, 18:42:32 »
10 lbs per 1000 rpm hot is a universal minimum for 4 stroke engines till relief pressure limit is reached
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline cxman

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Re: Cams not getting oil
« Reply #19 on: May 21, 2017, 18:43:53 »
if its been running with dry cams you are going to need at least another head and cams

the cam runs right on the aluminum head no oil film you have scrap
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others