Truck is '95 PSD, 155,XXX started blowing smoke and oil out exhaust pipe. This truck had sat for a while before I bought it. I had posted on here before and had some help with the burned valve cover gaskets. Sat. she started smoking/missing real bad, and blowing oil out the pipe. Taking the oil filler cap off there is some blow-by but not as bad as a video on youtube for a 7.3.

My question is; can someone give me direction on compression check? I have a Diesel Eng. book like Haynes but not much help on PSD, also youtube does not seem to have anything either.

 

How much pressure do you have in the blow by? If you flip your oil cap upside down and place it over the hole, does it shoot off or just vibrate and slide off (engine running)?

A blown turbo will also send oil out the tail pipe. Remove the intake hose and check for play in the shaft. A little up and down or side to side play is ok as long as the fins on the wheel don't touch the housing. Any in and out play means it's shot.

 

Using the cap upside down method, the cap sits till it slowly vibrates out of the way. However, with the temp gauges at about the same location the '96(193,XXX) has what APPEARS to be less blow-by than this '95. I have no glow plug adapter to check compression and with snow coming in I will have to wait to tie up shop space till I can find one. I read some old posts on here and it looks like I could make one if I find an old glow-plug. When I get her in the shop I'll go over that turbo.
Thanks!

 

Smoke coming out the fill tube on a 7.3 is nothing to worry about. It's the pressure you should worry about. My engine will vary from no smoke to a heavy white smoke depending on the engine temp, brand of motor oil, and miles on the oil.

If the oil cap just sits there I'd skip the compression test for now and focus on the turbo.

 

Great! Sounds like a plan. Other than a donor one from a used truck is there an inexpensive way out? I mean like a rebuild kit? I was a machinist in the last century.

 

Rebuild kits are avaliable. $100 - $150. Depending on wheel condition, you may need a compressor wheel.

 

If it started missing and running poorly I'd be more inclined to think it's related to the injector o-rings or UVCH than a turbo seal.

 

True. I think there's more than one thing going on here.

 

Not to move off topic but having the cap blow off doesn't really mean anything. It only indicates that you have decent blow by. Sure, your compression is slightly lower but you'll probably still get a ton of miles out of before you start using enough oil to matter. I doubt the decrease in power is noticeable.

I'm not trying to stir anything, I agree with you F-350-6.

 

I really do appreciate ya'll coming out and helping! I had to take a few days off to push snow so have not pulled truck into shop.

On an earlier thread with this truck I mentioned it had a replacement injector. I still feel this one is the culprit as far as missing, it was the one with a broken poppet screw. I was told at the time once they break a screw it is a bad inj. and it will break again. All this is hypothetical till tomorrow(?), but, is it possible that the turbo seals are bad and with the diminished power I mashed it a little more and the poppet screw broke again and caused the missing?

Would it not be a bad thing to determine if the turbo is bad and be prepared to buy a seal kit for the inj. as well, replacing the bad one as I go?

It's easy to choose which one came first, the chicken or the egg and to deal with it; but when one has to deal with chickens, egg production, waste products and weasels that want to turn the chickens into meals then this whole thing gets a little above my pay grade. I love these IH engines, DI-IDI but I'm still learning as I go. And I have yet to find a good local mechanic.

The above is not really germane it's me waxing philosophic after a brutal 40 hours working with just a nap and bad coffee.

 

Would the EBPV send oil out the tailpipe?

I don't think this is injector related. It has to be either the turbo or the EBPV articulator.

 

The original symptom that was described sounds exactly like what I was experiencing when I blew an injector O-ring.
I'm not sayin', I'm just sayin'.

 

Pulled air cleaner and boots off down to turbo. The shaft, as compared to my other truck, is wobbling side to side and wearing a ridge in the inlet neck. I was told over the phone that a little side play was ok just not rubbing. There does not feel like end play, but of course the side play is excessive. Can this cause the oil pumping? Or should I pull the inj.'s and re-o ring? Inj. seal kits don't look expensive. Also is the housing toast?

 

time to pull the turbo off and get a good look at it on inlet and outlet sides

 

X2 on what Farm & Mike said, I would bet on the turbo being the oil source. Rebuild time or get another!