Cj5 Smokes When Revving Engine And When Accelerating.

This= valve seals from everything I know. This also means that I know my truck needs valve seals.

 

You must have been following my '57.

 

Well I pulled cylinder number one intake valve spring off and found the valve stem seal to be dry rotting and cracked. I pulled on it and it just split in half.

 

Well Felpro still makes them and they are .32 cents each on rock auto.

 

Ok I replaced the intake valve stem seals and it doesn't billow blue smoke any more. But there is still alittle smoke when I mash the throttle. Is it possible that oil has soaked into the carbon that is in the combustion chamber. I am going to drive it tomorrow and see how it does.

 

I drove it today and it doesn't smoke anymore like it used to. The spark plugs were black and covered in soot when I checked them alittle while ago they have cleaned up and turned back tan. I'm going to buy a can of sea foam top engine cleaner and run that through it tomorrow to clean the intake ports out.

 

Glad to hear it.

 

I've got the same smoking problem. Thick oil helps minimize it. The head was shaved and done several years ago but I may check the seals like you guys say. Is this something I can do without removing the head? How to I keep the valve from dropping when I pull the keepers?

 

Can I change the exhaust valve oil seals without special tools?

 

You will need an air compressor. I just made a tool with a busted off spark-plug and an air hose coupler brazed together.

No doubt your FLAPS would have something similar for a few dollars.

Then some kind of valve spring compressor of the forked-lever type, also easily sourced for 20 or 30 bucks.

 

No seals in the exhaust valves?

 

I'm looking up new seals. I see Fel-Pro #407 are easily found locally but are round o-rings.
Sealed Power MV-1551 are squared off o-rings if that makes sense but can't be found locally. Is on type better than the other?
Maybe the Fel-Pro picture is a generic pic and they are actually squared off.

 

Installed new valve stem seals and flushed engine with Sea-Foam in oil and down carb. Smokes more than before the new seals.
1) Changed oil a couple times using 15w-40 diesel. Last change has Engine Restore added which raised compression a couple lbs in each cyl.
2) Compression dry ranging from 100-112
3) Compression after 2 squirts of oil ranging from 105-121. 3 cylinders went up only a couple lbs while #4 went up from 112-121.
4) A/F ratio gauge reads good.
5) Haven't driven it yet but running in the driveway it smokes all the time. At idle and when getting on the gas.
6) I haven't checked the PCV valve. If I disconnect the line at the carb I should see a lot of blowby coming out if rings were real bad correct?
7) I could see the tops of the piston had a lot of carbon on them hence the seafoam
8) Before replacing the seals the plugs were black, sooty with tan color right at the very end of the electrode.
9) Plugs are now oily.
10) Oil pressure is 40 cold, idling. 30 hot, idling. Doesn't change when hitting the throttle.
11) I had the head done about 20 yrs ago and it has probably 2000 miles on it since then. The valves would barely move side to side inside the guides. Very good fit.
Any ideas?
Thanks.

 

Thanks. Good thing about the increased smoke is it drew my attention to an exhaust leak I didn’t know was there.

 

Does this mean new pump or can they be rebuilt or repaired?