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7.3 Powerstroke question

Chase39

Chase39

Active Member
Location
West Valley City, UT
UPDATE: I've been way busy finishing up my crawler to take it on its first run out which was a blast!

But today there was a minute to spare so I tore off my drivers side valve cover to see what cylinder was dead. First thing I notice is this little lonely red wire hovering over Cylinder#3. I think to myself. "I wonder where that goes. Look both the wires to the injector are there so it must be the Glow plug. Let me just plug tha...... wait where the hell is the glow plug?"

Yeah the glow plug is missing. The outer shell was still there and threaded loosely. but the probe is missing, probably chilling in oil pan.

So Alas, I found the "Blowby" haha

Now the next question is. Why would loosing a Glow plug cause a Coolant leak... Or as i'm typing this I thought of this possibility. Could the headgasket have went. filled the piston full of antifreeze. hydropopped that we little autolite glow plug out.

Let hear some theorys!!
 
T

Toad

Well-Known Member
Location
Millville(logan)
Do you have the ability to manually pressure up the coolant system? Compression test? I had coolant get into a cylinder from a injector cup. I dont know if you can get coolant mixing into the oil from a cup.
 
Last edited:
Chase39

Chase39

Active Member
Location
West Valley City, UT
Toad said:
Do you have the ability to manually pressure up the coolant system? Compression test? I had coolant get into a cylinder from a injector cup. I dont know if you can get coolant mixing into the oil from a cup.
Click to expand...

I will tomorrow when autozone opens. haha I left my wallet at home today so I couldn't rent one tonight. Hopefully be able to hear or see the leak
 
T

Toad

Well-Known Member
Location
Millville(logan)
is it possible you two separate problems? Blown out glow plug and bad oil cooler? Like you said these motors dont typically have head gasket problems.
 
Chase39

Chase39

Active Member
Location
West Valley City, UT
I bought one. That was my plan to run compression tests before i started tearing it further down. I noticed this and spent some time looking for the other end of the glow plug. and had to leave before i tested any of the cylinders
 
Chase39

Chase39

Active Member
Location
West Valley City, UT
Ok I did a compression test. It was 375 on that one cylinder. But there was one thing. When I cranked it over the first time to clear the cylinder it shot out what I thought was left over fuel and oil at the time. Did the test. Came back the next morning and for shits and gigs I cranked it again. Fuel and antifreeze shot out. Can antifreeze leak through the injector cup with out the injector opening. The motor was actually hydro locked until I pulled the compression tester to clear it again. I think it hydrolocked and the glow plug gave out.
 
T

Toad

Well-Known Member
Location
Millville(logan)
Call me. I think your having a similar problem to what I had. 435 five one two-6 nine 43. What was the compression on the rest of the cylinders?
 
broncomitch

broncomitch

dont be a sheep in a jeep
Location
west jordan,UT
Look at the links I posted.
Willing to bet your cups or head is bad..
Witch if it was hydro locked and it most likely did it before hand, your head gaskets are bad now also.

Pull the heads and have them checked out.
 
Chase39

Chase39

Active Member
Location
West Valley City, UT
I'm going to pull the injector. Test to see if I can pinpoint the leak to the cup. Replace if bad. Than do a leak down and coolant system check again. I'll be able to tell if the headgasket are bad.
 
Chase39

Chase39

Active Member
Location
West Valley City, UT
Alright got an answer to my question. So after a couple of weird test results. and a couple weeks of ignoring the hell out of this truck. Something dawned on me.

But lets start from the beginning to catch you up.

Compression test 355.

Changed the injector cup

Leakdown test. fails horribly

compression test 10

Thought I must have messed up on the cup.

Coolant pressure test. fails. cant pinpoint.

pull injector still cant pinpoint.

Give up..

Look at how shiny the truck is.

Get back at it.

So here we are at today.

After a week and a half I look back in the injector hole and its still full of oil.

My first thought is. How can something fail a leakdown almost 100 percent and give no compression but hold oil.

Got an idea

Pressurize the coolant system. #4 piston is at top of stroke with oil filling the injector hole.

Assuming it was a headgasket. Bubbles would come out the injector hole from the pressure escaping into the cylinder.

No bubbles..

Hand crank engine to about Half dead center.

Laugh cause theres no such thing.

and cause there is no bubbles.

Hand crank till close to bottom of stroke

add oil to fill the cylinder.

Pressurize again

Hey look at all those bubbles....

So from all that I think its safe to say ive got a leak in my cylinder wall to the coolant chamber near the bottom of the stroke.

Conclusion. Need a new block. But hey at least its figured out right:)
 
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