95' Junker Drag Truck

Mine looked the same with water in oil, oil in rad. Turned out to be a crack in the rear cylinder. I hope that's not the case with you.
 
I removed the cylinder last night and took a few pictures.

Cylinder Head #5 & #6
CylHead3.jpg



Cylinder Head #3 & #4
CylHead2.jpg



Cylinder Head #1 & #2
CylHead1.jpg



Head Gasket #5 & #6
Gasket3.jpg



Head Gasket #3 & #4
Gasket2.jpg



Head Gasket #1 & #2
Gasket1.jpg



Overall
CylHead049.jpg



Block #1 & #2
Block1.jpg



Block #3 & #4
Block2.jpg



Block #5 & #6
Block3.jpg
 
USARMY12V said:
Are you still running stock valve springs? I can't really tell because of the smaller picture on my phone but I don't believe they are... Point being do you think you're losing top end due to float?

Edit: also looking forward to see where your spray is landing and condition of the internals!! Fingers crossed!!
Click to expand...

I wouldn't believe him if he said he was. He's making a lot of power for not going over 2200rpm.
 
Piston #1
Piston1.jpg



Piston #2
Piston2.jpg



Piston #3
Piston3.jpg



Piston #4
Piston4.jpg



Piston #5
Piston5.jpg



Piston #6
Piston6.jpg



Bottom of head gasket cylinders 1-3
Gasket4.jpg


Bottom of head gasket cylinders 4-6
Gasket5.jpg



Here are some close-up gasket shots between cylinders 3,4, & 5 that looked a little suspect when the head came off.
Gasket6.jpg


Gasket7.jpg


Gasket8.jpg




#3 piston looks like it was half steam cleaned, I assume this cylinder was eating some coolant. Does anyone have any input or thoughts?
Hole3.jpg


They cylinder walls on #4 are a little rough, deep enough that some marks can catch my nail. I haven't measured this bore yet but it looks like there is some damage.

#4 scuffed shared cylinder wall with #5
Hole41.jpg



#4 Scuff closeup
Hole42.jpg



#4 scuffed shared cyinder wall with #3
Hole43.jpg




The remaining cylinders appear to have good crosshatch with a little wear near the top where the rings stop and the piston does it's wobble during TDC dwell.
Crosshatch1.jpg


Crosshatch2.jpg
 
Last edited:
You would be correct in saying it looks steam cleaned and it does happen due to coolant. I've seen it in Mitsu's we work on due to blown headgaskets from higher boost and lack of clamping power thus headgasket leaks.
 
And finally, a spray pattern shot, looks like the fuel is spraying inside the bowl at 26*!!!!

SprayPattern.jpg
 
Barely in the bowl. lol

It looks like Cyl4 is entirely clean like #3 is partial? Is it the picture or does it look that way to you as well? I wonder if some debris got into #4 to cause the scrubbing. It is right over the wrist pin, if it was 90* on the cyl wall it could be bore wear from the piston rocking. That direction would require play in the rod/pin/piston.
 
USARMY12V said:
Are you still running stock valve springs? I can't really tell because of the smaller picture on my phone but I don't believe they are... Point being do you think you're losing top end due to float?

Edit: also looking forward to see where your spray is landing and condition of the internals!! Fingers crossed!!
Click to expand...


This truck has 60# valve springs on all 12 with stock retainers and locks. They are actually cheap $100 Pac Brake springs, not even true Cummins Marine Springs.


The governor springs in the pump were sourced from Darren Morrison @ ProStreet Diesel, as I recall, they are rated for 5500 rpm. They gained only a couple hundred RPM over the super-tight 4k Pac Brake springs due to the 160 pump's cam limitations, however, they did add some torque/fueling in the 1500-2200 rpm range.
 
SASDakota said:
Barely in the bowl. lol

It looks like Cyl4 is entirely clean like #3 is partial? Is it the picture or does it look that way to you as well? I wonder if some debris got into #4 to cause the scrubbing. It is right over the wrist pin, if it was 90* on the cyl wall it could be bore wear from the piston rocking. That direction would require play in the rod/pin/piston.
Click to expand...

You are right, #3 & #4 both look to have been steam cleaned. #3 is easier to see because it's partially done, maybe some coolant sat on it for a few months and removed the carbon buildup?
 
How much were his 5.5 springs? Also you're not running a girdle or main studs right? It'll be interesting to see how out of round your bores are. Also wonder how the main journals look... Just yank the whole thing to see how she looks haha just kidding. It's simply amazing how far you can go on so few dollars. I'm pretty sure I have more in my truck with 550hp and unknown ET than you do in this with nearly 50% more power. Wish I had the gumption to just yank my trans out and do the cheapo mods. Just sucks billet shafts can't be sourced cheaply.
 
Big Blue24 said:
You are right, #3 & #4 both look to have been steam cleaned. #3 is easier to see because it's partially done, maybe some coolant sat on it for a few months and removed the carbon buildup?
Click to expand...
Coolant leaking into the cylinder ends up in the combustion and creates steam due to temperatures. Honestly it doesn't look like that big of a deal. It'd be more worrisome if your walls were rusted horrendously... Wouldn't be surprised if the coolant isn't the culprit of your scuffed walls. But could be other factors.
 
USARMY12V said:
How much were his 5.5 springs? Also you're not running a girdle or main studs right? It'll be interesting to see how out of round your bores are. Also wonder how the main journals look... Just yank the whole thing to see how she looks haha just kidding. It's simply amazing how far you can go on so few dollars. I'm pretty sure I have more in my truck with 550hp and unknown ET than you do in this with nearly 50% more power. Wish I had the gumption to just yank my trans out and do the cheapo mods. Just sucks billet shafts can't be sourced cheaply.
Click to expand...

The billet input and TC were the most expensive part to my build!

But the rest is cheap and easy, as long as you aren't thrashing it or well beyond the parts means..
 
SASDakota said:
They look really dry and clean, did you fire it up prior to tearing down?
Click to expand...

No, the truck has sat in my garage since late May of this year. I live in Las Vegas so it had lots of dry hot weather, not sure if that factors into the piston cleanliness or not.

Maybe its just a super-clean burning motor!!!! :poke:
 
As with most things, installation costs for labor are the real killer in most cases. However, some pieces cannot be spared such as a billet input... Converter isn't so bad. DPC is reasonable IMO.
 
I can't believe how clean the pistons are compared to when mine was at 25*. Im a little jealous.

Sent from my DROID3 using Tapatalk 2
 
madmikeismad said:
I can't believe how clean the pistons are compared to when mine was at 25*. Im a little jealous.

Sent from my DROID3 using Tapatalk 2
Click to expand...

It looks like my injectors had a tighter than stock spray pattern. My first set of measurements came up with 134* spray pattern, I need to try a second method to 100% confirm but it is clear to me that the spray pattern is tighter than stock.
 
Big Blue24 said:
It looks like my injectors had a tighter than stock spray pattern. My first set of measurements came up with 134* spray pattern, I need to try a second method to 100% confirm but it is clear to me that the spray pattern is tighter than stock.
Click to expand...

luckyyyyy
 
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