Oil spraying in engine bay

Submitted: Saturday, Aug 23, 2008 at 10:49

ThreadID: 61000 Views:1932 Replies:3 FollowUps:1

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Mudripper

Hi all, my mate has a problem with his Kia Mentor 1997 model. After about 20-30 mins of driving the dipstick gets blown out and oil sprays out from the dipstick hole. The engine runs OK though. The crankcase is obviously building up pressure some where. I'm thinking of a blocked or faulty PCV valve?

Any info appreciated, as I'm not familiar with this kind of problem.

Cheers

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Reply By: Member - Mark G (NSW) - Saturday, Aug 23, 2008 at 10:51

Saturday, Aug 23, 2008 at 10:51

MUDRIPPER

definatly check the pcv , sounds like your problem.

AnswerID: 321822

Reply By: Tippa - Saturday, Aug 23, 2008 at 11:54

Saturday, Aug 23, 2008 at 11:54

It's either a blocked PCV valve or excessive piston ring blow-by.
Hopefully just the valve, and easy to check and clean.
Usually on top of the rocker cover, pull it out of the rocker cover's rubber grommet and remove it from it's hose. Get some carbie cleaner, thinners etc and give it a good soak and clean inside. Give it a shake and you should hear it freely rattle open and closed. When it's clean, put your mouth on the end which the hose fits onto, and give it a blow and a suck. It should allow you to suck but close to stop you blowing.
Hope this is the simple fix!

AnswerID: 321824

Follow Up By: Tippa - Saturday, Aug 23, 2008 at 12:03

Saturday, Aug 23, 2008 at 12:03

Just to add to this, if the PCV valve is fine, or it still builds up excessive crankcase pressure, then it may be time to have a compression check done, or for $50 he can buy a compression tester and have a go at it. Pull all spark plugs, screw it into one cylinder at a time and turn it over with the ignition key. Compare all readings.
Now with a syringe or oil squirter can, squirt about 30ml engine oil into the cylinder and to the comp test to all cylinders again.
Results:
* Any reading typically around 150psi is good.
* Below 120psi is not good.
* If the reading increases with the oil squirted in, its the piston rings blowing by, which you sealed temporarily with the oil, and a bottom end reco is needed.
* If the low reading stays the same, its valve seats which aren't sealing which is a head reco.
Cheers.

FollowupID: 588734

Reply By: Member - Bucky (VIC) - Sunday, Aug 24, 2008 at 03:56

Sunday, Aug 24, 2008 at 03:56

Danger, danger, danger..

I am thinking of the worst case scenario here..

Blow back/blow by, which ever school you went to, and that means big $$$$$.

I hope I am wrong.

Either a stuck PCV valve, or a major engine fault,
.............ie, rings, piston hole, valve problems...

I hope I am wrong

Cheers
Bucky

AnswerID: 321921