I took a look at the oil cap again. That pinhole doesn't really lead anywhere or do anything. The pinhole is in a disc which is pushed into the cap to make it flat. I blew air into it and could see it escaping around the seam of the disc. My guess is it's there to relieve air pressure during cap assembly when the disc is being pushed in.

It seems that the cap we have, as well as that baffle that you pulled out of the fill tube is part of a TSB to combat the problem. So we have the "fixed" setup.

https://dodgeforum.com/forum/1st-gen...iller-tsb.html


This is how the cap and fill tube looked before the TSB





I didn't take a pic of it but after driving to work today, the cap looked almost clean of the emulsion without me wiping anything off. So it builds up on short weekend drives and cleared up with a full warmup. During the summer I wasn't getting any buildup and I'm getting very little buildup now, so it's really not a problem for me. Full synthetic and full engine temp is the solution.

 

My Dak had the problem. Didnt know anything about it. Thought i blew a head gasket but the motor ran great with no loss of antifreeze.

Why doesnt the pcv pull the moisture out?. I thought mine was plugged..replaced it...didnt fix it, so i just clean it off every now and then.

My 5.7 ram has a little moisture but i now drive 25 miles each way to work.

 

Its the condensation that builds up on the inside of the tube & cap.... you can see it on the cap in this pic. The problem is the cap & fill tube plastic dont retain heat and/or get up to a temp to prevent the condensation from occurring. By insulating the fill tube, now ambient air temp has less of an effect on the temp of the plastic.





Had an idea yesterday that I am going to try... have a look at the pic below... see the white filter under the intake elbow that has the neoprene sleeve on it? I have been doing that for years on the Ram to keep the fuel in the filter from temp swings. Originally the intent was to keep the fuel warm while in MN as it is after the fuel heater. The thought is to find something similar that will fit over the fill tube cap and slide down far enough keep it in place w/o having to tie it down in any way.

 

No update for today... still @ work ( 12 hr day ) and its not going to be a priority when I get home (90 min drive ATM)

 

Remember these?

The black tube from the header to the air intake snorkel was used to heat the incoming air for the engine to prevent the carb from icing over. If you need to heat the oil tube to prevent sludge from forming in the tube, it might be possible to adapt this setup to run exhaust heat around the oil tube.

An alternative, an electric heater. One of these mounted inside the tube would keep the inside of the tube heated, and being that it's a silicone rubber wafer any oil shouldn't affect it. I've never used this before, but I'm saving the link for future use. I've never liked having to wait for the engine to warm to get the cabin warm in the winter, so one of their more powerful heaters might do the trick on that.

 

yup, got one in the project tool box... that would need to be dialed down quite a bit. i originally picked mine up to wrap around the diesel fuel filter in the pic above, then realized keepi g the fuel cooler uncovered got a bigger grin all hear round so i scrapped the idea. then i thought of a coolant filter with the wrap on it feeding the heater core...

as for the exhaust, i would route that over towards the air box

 

had a bmw m3 years back that fed coolant across the throttle body to keep it from icing up

 

AFAIK, this is a common setup for most cars.

 

I used to flip cars for extra $ years back and went thru a lot of them, the BMW's were the only ones that had it. Had a VW & Audi in there as well and neither had it. The 2 BMW's were mid 90's E36's.

 

I know Toyota and Hondas have it. My 7th gen Accord has it. I believe also Toyota attaches with a valve to the TPS and it works with the coolant temp somehow. Ford, Mazda, Mitsubishi.... you can add those to the list.