What is this next to oil filters??

HI ALL,

I have tried to locate this device in the TM's but can't seem to find it anywhere. It is next to the oil filters toward the fire wall of the LTD deisel. There is a petcock on the side of it which I get some nasty oil like substance from. Is this suppose to be drained when you do an oil change or is it something else?? The whole device is circled in orange and the petcock is shown with the blue arrow. Any help would be greatly appreciated.


Thanks , Mark

oil cooler and dont have to do a thing to it. Leave it be.

Oil cooler. The nut under the right filter should be drained.

Jinx, You are it.

wow look at that times... That was a close one

I was just looking at mine a few hours ago and wondering the same thing.
Wonder why they put a petcock on it if you don't need to do anything with it

Thanks both of you......at the same time lol

Does oil flow thru it though?? I changed my oil and it looks all nice and shiney clear but the stuff I got out of the petcock was black and nasty. Only opened it for a sec and got a lil bit out. Didn't want to mess anything up.


Mark

to draw a oil sample for the Motor pool people to find out if you need a oil change and if there are any internal problems

Mine just has a 3/4 plug in it.

The petcock is for purging the air from the cooling system. Oil in there would be BAD, check the radiator. I would recommend draining that nasty black goo from the coolant side.

Oil samples for the AOAP were ALWAYS taken from the dipstick tube, a length of 1/4" translucent poly tube, the vamp gun and a sample jar, with lid were the materials needed along with all the administrative info. The tubing was inserted into the dipstick hole, fed down until it hit bottom, then withdrawn about an inch. Next, the vamp gun was slid over the tube so the tube was nearly at the bottom of the jar, the nut tightened around the tube and the pump actuated until the jar was 3/4 full.. Screw the cap on, send it to the clerk with the form and then wait for AOAP to tell you all is good.

Should I take the side cover off and clean it all out and see if there is a problem?? There isnt any water in the oil and when I drained the radiator there wasnt oil in there, it was kinna brownish but not oily to the touch.

thanks, Mark

Just open the petcock with a jug to collect the nasty stuff and drain until it runs clean.

Is this a recent depot overhauled engine? Toole Army Depot was really proud of slapping stickers on the engine, a fresh coat of CARC on the engine is a good sign of a depot overhaul. If this is the case, the oil is probably left over preservative oil that has collected in this heat exchanger.

Since the oil pressure is most often, much higher than coolant pressure, oil can leak into the water But this is very rare.

I bought this deuce from a private party so I have no idea what its history is. It wasn't running but the IP is fixed now so it runs pretty nice. Everytime I fix something I find something new to go after. Fixed the master cylinder and wheel cylinders just to create an airpack problem which is fixed now. Fixed the radiator just to find this new problem. Someday Ill have it all ironed out lol. Thanks for the advice, Ill get on it in the morning.

Mark

Check out the pictures of this guys pre-lube pump installation. He replaces that petcock with his supply line, and keeps the petcock for oil sampling.

M35A2 Engine Prelube System Installation

I like this preluber but where did he get it at? And how much?

Hey Hellrazor1, let us know how that goes. Past posting on here has always suggested that the valve is for oil sampling. That being the oil cooler goes to reason there is oil or coolant on the other side. The coolant is contained in a seperate vessel inside of this one.The oil then transfers heat to the coolant and to the outside via the larger chamber. Look at the pics of the preluber install above and oil is routed through this port.

The petcock is on the oil system not the cooling system. I tried to drain the oil from it as suggested earlier in this post and after getting a half gallon of oil from it (no water whatsoever) and then checking my oil level in the engine (which is now 1/2 gallon lower) I have decided it is an oil sampler and not a bleeder for the cooling system . After a quart I was gettin the idea but mite as well really prove it out lol.

Mark (Learning more everyday)