Oil filler tube upchucking oil into my oil bath air filter!

[RichardS]

is there a baffle on your oil dipstick ?

[1955CJ-5]

Does your old fuel pump come apart easily?

It would be interesting to see what condition the diaphragm is in, and the valves too.......

It doesn't need to run to do a compression check, though if possible it's a better indication if you do one when the motor is warm.

If you find a low cylinder a little oil added through the sparkplug hole will help seal the rings, so then if the compression doesn't change it directs you to the valves... if it improves, it's the rings.

Good luck on the re-start.......

[Mytwojeeps2020]

Richard: no, no baffle.

1955cJ5:
I did not autopsy the “old” pump. It was replaced less than 5 running miles ago. I replaced it again on a theory that the “old” one had a bad diaphragm that was allowing it to flood the crankcase with gas.  I also did the other stuff to try and cover all possibilities.

Tomorrow, I am going to briefly crank it up just to get oil back in the lines (and engine). That complete, I am going to disconnect the fuel and the coil-to-distributer wire, then crank it to test the compression.

[BillT]

My baffle was missing also. Found it when I cleaned out the oil pan. Brazed it back on.

[Mytwojeeps2020]

Ok, boys & girls, here are the results.

Richard, if you’re out there, yes my oil dipstick has a baffle. I didn’t know what that was until I looked it up.

The engine fired up wonderfully- just like in days of yore.

I let it warm for a few minutes, then did the compression test. Starting with the first cylinder (at the front of the engine) and working backwards towards the firewall:

90
90
95
110

I used an OEM tester.

I let it idle for 30 minutes. A lot of smoke at first from the tailpipe and from the joint that connects the exhaust manifold to the tailpipe.  After a few minutes, the latter stopped and the amount of smoke from the tailpipe lessened - but did not stop. I never had smoke before all this trouble started.

I checked the oil filler tube to air cleaner every few minutes and there was a vacuum, so all looks ok there. Unlike before, this time there was no gushing of oil/gas out this port.

Not one time in the 30 minutes did it “miss a beat,” at least to my untutored ear.

I’ve never had a lot of smoke before. During the run, the oil pressure (if the gauge is correct) dropped from about 41 to 38 psi.

So, the original issue “appears” to be the fuel pump.

I’ll take it out tomorrow for a run and see what happens. Right now I’m headed for the gin bottle.

Thanks all!

[Mytwojeeps2020]

PS: I just cranked it up again. No more smoke from the tailpipe.

[SteveKfl]

Sounds good.  Congrats.  Smoke seems like the PVC may be pulling some oil into the intake just above the exhaust manifold.  You might be accumulating too much oil in the valve area, and the suction pulls the oil onto the hot pipe???  I don't think it would show up when just started, but I'm guessing from here.  Good Luck! 

[1955CJ-5]

That compression is not so bad....it may come up if it's driven more

My cj had a low cylinder but some driving and Seafoam added to the gas helped bring it up....

Hope your drive goes well.

That pumping of fluid out the oil filler was bizarre....

[Rus Curtis]

Ok, boys & girls, here are the results.

Richard, if you’re out there, yes my oil dipstick has a baffle. I didn’t know what that was until I looked it up.

The engine fired up wonderfully- just like in days of yore.

I let it warm for a few minutes, then did the compression test. Starting with the first cylinder (at the front of the engine) and working backwards towards the firewall:

90
90
95
110

I used an OEM tester.

I let it idle for 30 minutes. A lot of smoke at first from the tailpipe and from the joint that connects the exhaust manifold to the tailpipe.  After a few minutes, the latter stopped and the amount of smoke from the tailpipe lessened - but did not stop. I never had smoke before all this trouble started.

I checked the oil filler tube to air cleaner every few minutes and there was a vacuum, so all looks ok there. Unlike before, this time there was no gushing of oil/gas out this port.

Not one time in the 30 minutes did it “miss a beat,” at least to my untutored ear.

I’ve never had a lot of smoke before. During the run, the oil pressure (if the gauge is correct) dropped from about 41 to 38 psi.

So, the original issue “appears” to be the fuel pump.

I’ll take it out tomorrow for a run and see what happens. Right now I’m headed for the gin bottle.

Thanks all!

(copied in case others can't see)

Congratulations on progress!!  I guess that gin bottle was earned!

You coughed and spewed oil/gas into the breather - and possibly into the intake while figuring this out.  But there are other things that could also be going on.  When I reference the Service Manual, I find at the end of the Tune Up section (Section C) that those numbers are good for an L-head.  The F-head should be a bit higher (my assumption is those numbers are for a new engine).  But, many things can be going on.  Other tests can help down the road but for now I agree, drive it!

The oil pressure should drop a bit as the temp comes up to normal.  Don't be surprised to see lower pressure on your drive - when you stop at a traffic light, etc. when the engine is at idle.

There should be a gasket between the manifold and exhaust pipe.  I had to cut mine.

[Mytwojeeps2020]

Took it out for its test drive today. Ran fine for about five minutes, then started smoking like it was burning coal!  This happened  when I put some stress on the engine by putting it into 4h and going through some sand. I immediately went back to camp.

The good thing is that oil no longer spews out the oil filler tube to the air filter.

Maybe I’ll try rye tonight...

[Rus Curtis]

Took it out for its test drive today. Ran fine for about five minutes, then started smoking like it was burning coal!  This happened  when I put some stress on the engine by putting it into 4h and going through some sand. I immediately went back to camp.

The good thing is that oil no longer spews out the oil filler tube to the air filter.

Maybe I’ll try rye tonight...

The smoke, is blue-sh vs. white?  Did it reduce when you got off the hard driving?

A sticky valve or leaky head gasket can help with making smoke.  Valves can be adjusted, but the head gasket (if bad) would need replacement.  Check oil and antifreeze (when cool) for droplets.  Oil floats so if in the radiator, it should be right on top.  Sometimes water droplets will stick to the dipstick when you pull it out, otherwise a small sample drained at the plug will tell.  Eventually, if one or the other, there should be a drop in volume after some driving. 

Sadly, these are old vehicles that require maintenance.  Eventually, it gets worked out....

[Mytwojeeps2020]

Rus, my answers to your questions are in CAPS.

The smoke, is blue-sh vs. white?  BLUE-ISH. Did it reduce when you got off the hard driving? NO

A sticky valve or leaky head gasket can help with making smoke.  Valves can be adjusted, but the head gasket (if bad) would need replacement.  Check oil and antifreeze (when cool) for droplets.  ALL CLEAR. NO WATER IN OIL OR OIL IN ANTIFREEZE.  Oil floats so if in the radiator, it should be right on top.  Sometimes water droplets will stick to the dipstick when you pull it out, otherwise a small sample drained at the plug will tell.  Eventually, if one or the other, there should be a drop in volume after some driving.  IS IT POSSIBLE THAT THE SMOKE IS BEING CAUSED BY THE ENGINE STILL BURNING OFF THE GAS/OIL MIXTURE IN THE OIL PAN FROM THE ORIGINAL PROBLEM (BAS GAS PUMP)?

Sadly, these are old vehicles that require maintenance.  Eventually, it gets worked out....

[scoutpilot]

Food for thought. If these old motors spend more time idling and/or in a lower RPM range they may not be able to breathe sufficiently to purge the crankcase of volatiles and moisture. The moisture will build up and appear in the oil filler tube as grey gunk. Even if the temp gauge says 160-180 that's not good enough. The simple solution? Drive it more and longer at, at least, 45 MPH.

[Mytwojeeps2020]

Scoutpilot, you’re right on point. This thing is rarely used on the highway, mostly on back trails. Also, rarely in third gear.

[Rus Curtis]

Scoutpilot, you’re right on point. This thing is rarely used on the highway, mostly on back trails. Also, rarely in third gear.

Blu-ish is oil.  So, at the risk of jumping to conclusions, I would guess there's no radiator leakage - just yet.  I also agree with Scoutpilot.  Short drives can be rough on engines. 

I would guess that if you've changed the oil after that last fuel pump dump, where the fuel pump is now working and no more fuel is left in the oil pan, then that is now resolved (residual will evaporate).  But spewing oil/gas up the filler neck as we've seen, could mean that oil wasn't going through the engine (without fuel dilution) as it should.  There could be either some passages partially blocked, i.e. under the valve cover - allowing oil to trickle down valves and into the cylinders or there could also be worn rings/cylinders allowing more oil along the piston travel getting into the combustion chamber (see Bruce_W's post on previous page).  A compression check with .5 oz of oil in each cylinder (SM, par E-106A) will help troubleshoot. 

But, drive for now.  Let it smoke.  Carry a quart to top off if need be.  A suggestion;  if you can't get up to 45mph, leave it in a lower gear and drive.   This will allow the engine time at a higher rpm expel gases and exhaust at a higher temp and pressure.  Not 30 mph in 1st gear, but just leave it in 2nd, as you indicated, for as much as possible.  I remember reading suggestions on vehicles needing 30mins-1hr driving to dry out exhaust.  So aim for a good drive when you can.