Do i need to tear down my Cummins?

[93DodgeCummins]

I went mudding with my pickup and my airbox sucked up mud and the mud got past the air filter. Then it wore down the blades on my turbo and mud got into my engine. I just cleaned the intercooler and the tubes and i put a different turbo on. I dropped the oil out of it and there was metal stuck on the plug magnet. Am i going to have to do a tear down of the engine or can I just change the oil and keep going?

[BILTIT]

Do a compression test. If it checks out, change oil+filter and run it.

[93DodgeCummins]

How do you that on a diesel?

[BILTIT]

Sorry, a blowby test.

Also what is your oil pressure like?



Taken from cummins forum

"You need a blowby tool.
The Cummins blowby orifice tool is simply a tee with one .221" (15/64-in) outlet. Connect one end of the tee to the end of the blowby tube. Put a manometer on last tee outlet. That is your blowby tool. They sell them at the Cummins, but I have made my own plenty of times, less than $10. A simple manometer can be made by looping into a 'U' 6 feet of clear tubing with water in it half way. Measure how high the water level rises with a tape measure, multiply it by 2, convert it to LPMs.

Rough conversion is 1"= 27 lpm, add 3 lpm for each one inch (1/2'' of rise in the tube) of water

The reason for multiplying by 2 is that inches of water equals the water rise in the open end of the tube plus the inches the water is pushed down on the engine side of the water tube. For simplicity my numbers below are the measurement of rise only.


Cummins new 5.9 engine numbers are:
63 liters per minute(2.5" water rise) @ 2200rpm,
76 L/Min (3.5" rise) @ 2500rpm
85 L/Min (4.5" rise) @ 2800rpm.

Worn engine that needs rebuilding are roughly double i.e.
126 L/Min(10.5"rise) @ 2200rpm
152 L/Min(14.5"rise) @ 2500rpm
170 L/Min(17"rise) @ 2800 rpm

Beside indicating a compression problem the valves could also be out of adjustment.

Another way (mine), same idea, is to block the blowby tube with a 1/2'' pipe nipple with a cap that has a 15/64 hole drilled in it. Use 3/8'' id looped clear tubing with water in it slipped over the oil dipstick tube. Other tubing end remains open. Use a sharp tipped felt marker to mark the water level with the engine off, have a helper start an already warmed up engine and run the rpms up to 2.2, 2.5 & 2.8k rpms. Mark each water level with the pen, measure the distance from engine off mark then multiply each by 2.

This is all very simple to do, just hard to explain with words. "

[93DodgeCummins]

Is there anything else i can check? I am opening to anything

[Tacoclaw]

Just change the oil and run it. If it starts smoking blue or your oil pressure is down, then it probably needs some TLC. Then ignore it and keep running it.

That's what I'd do, anyways.

A compressin/leak down test can be done on a diesel by pulling the injector and using an adapter to hook it to a normal compression gauge.

Also, how bad is the turbo worn? Got a pic of it?

[93DodgeCummins]

How do you post pictures. It says my file is too big.

[dazedandconfused]

Upload them to photobucket and link them.

[93DodgeCummins]

http://s1255.photobucket.com/albums/hh6 ... d831af.jpg

heres the turbo

[Tacoclaw]

Ouch.

I was hoping the turbo wasn't that bad and you were just overthinking it, but it's definitely missing some material. How much mud made it into the intake piping after the Intercooler?

[93DodgeCummins]

There was a film of dirt in all of the piping and intake manifold

[dazedandconfused]

Is it smoking blue or white? I would be surprised if you didn't wipe out rings sucking in that much mud.

[93DodgeCummins]

no smoke luckily

[Tacoclaw]

Well if it isn't smoking or acting funny, I'd change the oil and run it. Maybe do a short change on the oil in 1k miles or so and see if there's an abnormal amount of metal on your drain plug, but if it's holding oil pressure it sounds like you got lucky.

[93DodgeCummins]

Alright ill see what happens. I'll keep you guys posted and thanks for the info.