• Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!

  • Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.

Blown Head Gasket Recovery (no longer) - Massive Engine Failure (!)

Mullaney

Well-known member
Steel Soldiers Supporter
Supporting Vendor
7,662
19,663
113
Location
Charlotte NC
Good to know. I’ll have to figure out how to check the trans sooner than putting a different motor in. Maybe it did let go.

Also got the pistons out. There is some scuffing but I believe it’s from eating pieces of metal when the motor started to blow apart. There are small fragments of metal suck to the cylinder walls. The “scuff” on the crowns is carbon and can be scraped off.
View attachment 925585View attachment 925586View attachment 925587
.
Yep, those scuffs look to me like the motor letting go...
 

sue

Active member
425
344
43
Location
tulsa OK
Can anyone explain this mark on the exhaust valve?
View attachment 925208
A ½”-lockwasher would be about that size... But since this mark is so perfectly centered on the valve head and there are no evident signs on the corresponding piston, I doubt that the engine "ate" a washer... (?)
Again I have been around Reno racers, (Allisons, Merlin’s, with lots of boost)
and tractor pulling. I have to say this is very unique to me for failure of a “stock” engine.
But the beauty of a diesel over a “gas” engine is that you can’t melt a piston by going
“lean”. Ya can by over fueling.
but I don’t see the evidence of heat ……(over fueling)
and the “lock washer” , right up there with finding Bigfoot.
 

sue

Active member
425
344
43
Location
tulsa OK
I was wondering about that valve mark as well. There aren't any lock washers I'm aware of on the motor or turbo, especially ones that would have the potential from getting inside. On piston #7 there is a section on the lower left that seems to me “missing” the soot with some red color which looks odd. By combustion side problem does that include head gasket? Or more like piston/cylinder/injection problem?

Moving over to the passenger side of the block and head (pics below), I have a few valve impact marks in pistons 4 and 6. I’m assuming either the crank bent or something else bent to cause the valves to start opening when the piston was TDC. And strangely a little of the mysterious center valve ring imprinted on the piston too. Along with a red ring on pistons 4 and 8 around the intake valves. Not sure what that is. Also weird is 6 looks cleaner than the rest, with red residue on the head.

IP is a rebuilt 4911 pump that is supposed to be set to standard fueling. In the moments before failure my autometer EGT gauge was <1000. Even when pushing it hard I’ve never had it over 1050. Probe is tapped into the exhaust manifold before the turbo.

I'll lead you know about the heads. I haven't decided yet what I want to do.

View attachment 925220View attachment 925221
And the carbon above the top ring is normal because if you mic out the top of
most diesels , above the top ring diameter is normally smaller than below the
rings. ( face of the piston gets most of the heat and expands more)
which in heat failure (over fueling or cooling issue) there would normally not be
carbon.
 

CARC686

Well-known member
273
484
63
Location
Las Cruces, New Mexico
What's the plan? I thought of you today and wondered what's going on with your truck. Could always get an aluminum 6.2 instead of the iron one. Whole lotta zoom zoom if you're willing to deal with the electronic junk.
 

adf5565

Well-known member
Steel Soldiers Supporter
375
688
93
Location
Tioga, PA
What's the plan? I thought of you today and wondered what's going on with your truck. Could always get an aluminum 6.2 instead of the iron one. Whole lotta zoom zoom if you're willing to deal with the electronic junk.
Quite the timing, Saturday I actually picked up a used supposed running 6.5. I just want to get the truck driving again for now.

IMG_2608.jpeg
 

swbradley1

Modertator
Staff member
Super Moderator
Steel Soldiers Supporter
14,248
1,695
113
Location
Dayton, OH
I'm just curious, but did you share any of the information with the manufacturer? I live nearby by the plant and see it when I go up and down I75 frequently.

Not that it would help you but maybe it might help them.

IMHO
 

swbradley1

Modertator
Staff member
Super Moderator
Steel Soldiers Supporter
14,248
1,695
113
Location
Dayton, OH
I too have had an engine grenade on me. A Multifuel broke the crank in two and destroyed the block and it started righ up when I got it home. (Yes, I have a witness) It wasn't something you wanted to hear or see for that matter but it was interesting to see an engine with a two-piece crank run.

;-)
 

WWRD99

Well-known member
Steel Soldiers Supporter
1,091
1,672
113
Location
York Pa
Out of curiosity are you going to pull the 700 apart to see if a sun gear, planetary or sprag gave out? They are known for that. Tough to test a torque converter but the input shaft could have stripped out but you can see that if you pull the converter off.

Sent from my SM-S906U using Tapatalk
 

adf5565

Well-known member
Steel Soldiers Supporter
375
688
93
Location
Tioga, PA
Out of curiosity are you going to pull the 700 apart to see if a sun gear, planetary or sprag gave out? They are known for that. Tough to test a torque converter but the input shaft could have stripped out but you can see that if you pull the converter off.

Sent from my SM-S906U using Tapatalk
I'm trying to minimize the amount of work to do so I'm going to hope for the best and re-install as is. I've had the trans disconnected a few times so at this point it wouldn't take me long to pull if it does end up having issues.
 
Last edited:
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!

I've Disabled AdBlock
No Thanks