Anyone have any ideas why I would have Oil sitting ontop my intake valve???? I have changed Vavle Seals, Intake Gasket (2), Venting my PCV to rule that out... Any Ideas???
HELP OIL IN INTAKE PORT!
- Thread starter SorsCode
- Start date
-
Sponsors (?)
yellow5.0cobra
Founding Member
Cobra Intake..... But did put the Stock 5.0 Intake on it also..... I had them angled and there almost perfect..... that wasn't it....
Badder Adder
Founding Member
There's really only 3 ways oil can get in there...
1. Bad seal on intake.
2. Valve seals.
3. Excess oil in the combustion chamber.
If you've checked the first two then option 3 may be your culprit. Any blue smoke in the exhaust? Check the compression on that cylinder. From the pic, it looks like the valve only has oil on the very base of it, which is the area exposed to the combustion chamber. How does the saprk plug look?
1. Bad seal on intake.
2. Valve seals.
3. Excess oil in the combustion chamber.
If you've checked the first two then option 3 may be your culprit. Any blue smoke in the exhaust? Check the compression on that cylinder. From the pic, it looks like the valve only has oil on the very base of it, which is the area exposed to the combustion chamber. How does the saprk plug look?
Plugs are oil covered.... Blue smoke when the car runs (only after it warms up)
I don't see how it could come from the combustion chamber do to the fact that theres a puddle of oil ontop of the valve.... How would it get in there???
Thanks Everyone...
Danny
I don't see how it could come from the combustion chamber do to the fact that theres a puddle of oil ontop of the valve.... How would it get in there???
Thanks Everyone...
Danny
HoofnIt
Founding Member
Your rings are probably shot. I would recommend doing compression test or a leak-down test to track down the problem. I would assume that you would need a valve job as well. Oil from cylinder-->past bad rings-->past valve. Does this make any sense?
Compression test is 150 on all 8..... BTW Its to hard to believe that oil would come from the combustion chamber because its going to have to fight the incoming air to get inside the intake runner of the head... and i have asked around about that it is almost impossible to do.... What a symptom of a bad valve guide???
HoofnIt
Founding Member
What venting have you done to your PCV? It's probably obvious but have you changed the PCV valve and also checked the metal screen that sits in the grommet? I've heard that this can also become plugged and cause a problem.
yellow5.0cobra
Founding Member
Do you have a breather in your valve cover?
I had a real bad oil consumption problem, but was cured with a breather and a new PCV.
I had a real bad oil consumption problem, but was cured with a breather and a new PCV.
I have all the PCV lines caped... running a Filter on the VC and the PCV in the back of the intake is venting... Reason for this was to rule it out... lines had zero oil in them but did it anyways because no oil in the intake itself just ontop the intake valve
Its just i'm ticked i had to send a brand new AFR head back to the company.... And was hopin i could get some other ideas what could be wrong so thanks everyone that has replied but keep them coming...
HoofnIt
Founding Member
Have you contacted AFR to see if they could give you any insight? You've got me scratching my head on this one! How old are the heads?
HoofnIt said:
They (AFR) don't know what it could be.... They say if a Valve guide goes bad they all do.... Yes I have been in contact with them for over 3 weeks and 250 dollars worth of gaskets later... they finally had me send the head back... Head had less that 6 hours on it (150 miles).... Also around the spring on the head it had an oil ring like it was sucking oil... (#8 intake valve) where the problem was.... all the other had no ring like i just descriped but number 7 intake valve was starting to do that but then i took the head off but the number 7 plug was a little darker than 5 and 6.... Sorry so long but its hard to describe but need to... I'm just trying to get ideas i've been workin on this for over 3 weeks... just now praying its the guides...
HoofnIt
Founding Member
Are you saying that if one of the valve guides go bad, then all the rest are bad as well?
Does this mean they got a bad batch? What is the part number for your AFR heads?
HoofnIt said:
What they mean is the valve guides are all machined once... So all the guides are identical.... So if one is bad then they all should be bad....
AFR 1402 the 165 58CC head... only one of mine where bad so far... haven't ran it long enough to find out...
