charlierebel1967 Posted April 22, 2018 Posted April 22, 2018 I was wondering if anybody knows how to fix an oil fill cap on the valve cover top so it doesn't shoot oil out all over the engine?? I have taken an old inner tube from a tractor and cut a lil gap so the cap would go into its slot, but still shooting oil. its a 1986 2.5l
omega_rugal Posted April 22, 2018 Posted April 22, 2018 it`s not your oil cap, either the PCV valve is stuck, the lines are clogged or the engine is worn and blowby is pushing the oil out
charlierebel1967 Posted April 22, 2018 Author Posted April 22, 2018 6 minutes ago, omega_rugal said: it`s not your oil cap, either the PCV valve is stuck, the lines are clogged or the engine is worn and blowby is pushing the oil out thank you omega, I also have a new pvc valve but it really runs great other than the oil coming out!!
charlierebel1967 Posted April 22, 2018 Author Posted April 22, 2018 9 minutes ago, omega_rugal said: it`s not your oil cap, either the PCV valve is stuck, the lines are clogged or the engine is worn and blowby is pushing the oil out it does have 135,000 mi. lol
carnuck Posted April 23, 2018 Posted April 23, 2018 it does have 135,000 mi. lol But did the previous owner use ether to start it? (That’s what happened to mine) There needs to be a breather hose in and a pcv out. Come to think of it, they put two pcvs on mine. Sent from my iPhone using Tapatalk
Pete M Posted April 23, 2018 Posted April 23, 2018 4 hours ago, charlierebel1967 said: it does have 135,000 mi. lol that's actually low mileage for the 2.5L
Eagle Posted April 23, 2018 Posted April 23, 2018 4 hours ago, charlierebel1967 said: thank you omega, I also have a new pvc valve but it really runs great other than the oil coming out!! Nonetheless, the oil is bring pushed out because the crankcase is being pressurized. There's always some blowby but, in a healthy engine, the PCV system can handle it and suck the oil fumes through to be burning in combustion. If you have oil blowing out the fill cap, either the PCV system isn't working (which could be a clogged line or a bad PCV valve), or the piston rings are worn and there's too much blowby for the PCV system to handle. Can you run a compression check and post the numbers?
charlierebel1967 Posted March 18, 2019 Author Posted March 18, 2019 On 4/22/2018 at 6:53 PM, Eagle said: Nonetheless, the oil is bring pushed out because the crankcase is being pressurized. There's always some blowby but, in a healthy engine, the PCV system can handle it and suck the oil fumes through to be burning in combustion. If you have oil blowing out the fill cap, either the PCV system isn't working (which could be a clogged line or a bad PCV valve), or the piston rings are worn and there's too much blowby for the PCV system to handle. Can you run a compression check and post the numbers? Sorry guy's, I haven't been on here in awhile, bizzy @ work truckin the products, so I haven't been able to do a compression check yet, I just got done putting a new power steering pump on & thank the good Lord, no leaks. I am going to try running a high performance catch can system, as I do not believe my piston rings are too short as it doesn't smoke @ all. I love this lil truck & want to keep it as long as I can....
Jeep Driver Posted March 18, 2019 Posted March 18, 2019 16 minutes ago, charlierebel1967 said: Sorry guy's, I haven't been on here in awhile, bizzy @ work truckin the products, so I haven't been able to do a compression check yet, I just got done putting a new power steering pump on & thank the good Lord, no leaks. I am going to try running a high performance catch can system, as I do not believe my piston rings are too short as it doesn't smoke @ all. I love this lil truck & want to keep it as long as I can.... Blow-by does not cause the engine to smoke.
Eagle Posted March 18, 2019 Posted March 18, 2019 2 hours ago, charlierebel1967 said: I am going to try running a high performance catch can system, .... You mean like an old coffee can? That's about as high performance as I've ever seen a catch can. All it is is a drip sump, it's not like it's under any major pressure. Don't go wasting a lot of money on some high tech solution to a low tech problem.
cruiser54 Posted March 18, 2019 Posted March 18, 2019 CRUISER'S MOSTLY RENIX TIPS OIL FILLER CAP MOD NOVEMBER 17, 2015 SALAD 2 COMMENTS We all get tired of the oil film/leak on top of our 4.0 Jeep aluminum valve covers. Many times the biggest culprit is the loose fitting oil filler cap. Here’s a real easy fix: Remove the plastic oil filler cap and wrestle the original rubber gasket from it using a small pick or screwdriver. Make a duplicate of the gasket out of an old bicycle inner tube using scissors and a knife or razor blade. Install the duplicate on the cap first, and then the original over top of it. It will be a tight fit on the valve cover the first time, and may require some persuasion with a pair of pliers, but will get easier with time.
omega_rugal Posted March 18, 2019 Posted March 18, 2019 but then oil will spill somewhere else wouldn´t it?
Eagle Posted March 18, 2019 Posted March 18, 2019 2 hours ago, omega_rugal said: but then oil will spill somewhere else wouldn´t it? Yes. If the problem is blow-by pressurizing the crankcase, the excess pressure and oily fumes WILL vent wherever they can. If you seal up the fill cap, either the valve cover gasket or the rear main seal will be the next candidate for leakage.
Pete M Posted March 19, 2019 Posted March 19, 2019 some amount of gasses escaping is inevitable. that's what the CCV system is there for. but oil shouldn't be escaping with said gasses and there are steps to prevent it.
cruiser54 Posted March 19, 2019 Posted March 19, 2019 We're not sure it has blowby. Just that it's leaking from the oil fill cap, right? It can be pretty messy. This could be as simple as a CCV issue, vacuum leak issue, and a crappy sealing oil cap, which is super common. Make sure the intake manifold bolts are snug, the hoses below the throttle body on the intake manifold are in good shape, CCV tubing is in good shape and clear by spraying out with carb cleaner.
Josephangelo Posted June 30, 2022 Posted June 30, 2022 I'm looking for a solution to my valve cover leak. 1988 Comanche 2.5l 2wd base. The problem is the seal on the oil filler cap, I've got a new cap and I even doubled the gasket on the cap. It fits tightly on the valve cover, but it's still not creating a tight enough seal. The only thing I can think of is to replace the valve cover. Any suggestions would be great, thanks.
Eagle Posted July 1, 2022 Posted July 1, 2022 11 hours ago, Josephangelo said: I'm looking for a solution to my valve cover leak. 1988 Comanche 2.5l 2wd base. The problem is the seal on the oil filler cap, I've got a new cap and I even doubled the gasket on the cap. It fits tightly on the valve cover, but it's still not creating a tight enough seal. The only thing I can think of is to replace the valve cover. Any suggestions would be great, thanks. Read the thread you just posted in. The problem isn't the gasket on the oil fill cap, the problem is engine blow-by and a PCV that isn't sucking the blowby out of the crankcase.
Josephangelo Posted July 1, 2022 Posted July 1, 2022 I have replaced the ccv and the crank case ventilation hose. The oil is clearly leaking out where the filler cap is. The gasket is not sitting perfectly flat so it's not making a good enough seal.
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