1hdft cracked piston (1 Viewer)

[sexualchoc80]

Hi guys
Looks like I have cracked a piston, about to pull the head off Tuesday night and see the damage.
Crazy amount of blow by, I’m running 18 psi and a GTurbo red wheel, injection pump set to 1.55mm and egt in manifold 700°c max.
Just thinking about the cause ? Injector ?
Anyone else had this happen ?
Thanks team

 

[sexualchoc80]

Ps what pistons is everyone fitting ? Anything better than OEM performance wise ?

 

[3_puppies]

maybe some better help in the diesel section:

Diesel Tech / 24 volts

BJ/HJ diesels (3B, 13BT, 1KZ, 1HZ, 1PZ, etc) and other diesel conversions (ie: Isuzu, Hino, 4BT, 6BT, etc)

forum.ih8mud.com

 

[AussieHJCruza]

What year is your 1HDT?

 

[KiwiDingo]

What year is your 1HDT?

He says it's a FT in thread title?

 

[AussieHJCruza]

He says it's a FT in thread title?

Argh, don't mind me then...need to go back to reading school.

 

[sexualchoc80]

Thanks guys yes will post in diesel , 1996

 

[Dusten]

How long were you seeing 700+?

What afr?

I'd suspect that cylinder got hot. That's usually the reason for cracking.

 

[mudgudgeon]

700⁰c shouldn't be a problem in itself.

It is possible to have a leaky injector, and have high EGTs in an individual cylinder.
When was the last time injectors were refreshed?
I think you'd see signs if one injector was bad. Rough idle, Smokey exhaust

EGT probe in the manifold is only gonna give you an average/combined temperature.
Same is true for an AFR reading from the exhaust.


PS, it looks like a moderator shifted this to the Diesel Tech section

 

[Dusten]

700⁰c shouldn't be a problem in itself.

It is possible to have a leaky injector, and have high EGTs in an individual cylinder.
When was the last time injectors were refreshed?
I think you'd see signs if one injector was bad. Rough idle, Smokey exhaust

EGT probe in the manifold is only gonna give you an average/combined temperature.
Same is true for an AFR reading from the exhaust.


PS, it looks like a moderator shifted this to the Diesel Tech section

This is why I asked how long at 700*. As it's an average one cylinder could have easily seen excess temps.