Exhaust in coolant?

Crashmymax

Crashmymax

TJ Enthusiast
Supporting Member
Joined
Jun 28, 2020
Messages
137
Location
South Dakota
I am getting exhaust in my coolant. No coolant in the oil. No oil in the coolant. I used one of the testers that the fluid changes colors. Tried several times it changed everytime.
Not to familiar with the head on these. Does anyone know if this is more likely to be a cracked head or blown gasket? Thanks
99 Tj 4.0 supercharged
 
Could be either. The 0331 head (2000-2002?) have been known to crack. The only real way to find out is pull it down and have the head checked.
How much boost are you running?
One other suggestion, being since you're removing the head get yourself a set of ARP head bolts or studs.
 
  • Like
Reactions: Steel City 06 and flyinfish
About 9 lb of boost. I will probably just get a new head. Wouldn't hurt to do an upgrade with blower anyway. I
 
Crashmymax said:
I am getting exhaust in my coolant. No coolant in the oil. No oil in the coolant. I used one of the testers that the fluid changes colors. Tried several times it changed everytime.
Not to familiar with the head on these. Does anyone know if this is more likely to be a cracked head or blown gasket? Thanks
99 Tj 4.0 supercharged
Click to expand...

It's a CRACKHEAD:poop: or gasket-basket case
 
Any chance a cracked head or blown gasket can cause increased IAT's? I've had high intake Temps. I just ordered a new clearwater head
 
Can anyone interpret this as a bad gasket? I

20220630_111412.jpg


20220630_111349.jpg


20220630_111412.jpg


20220630_111432.jpg
 
yeah, definitely a gasket failure at cylinder 1. Not only is the gasket deformed on the passenger side but that piston looks like it's been getting some steam cleaning compared to the others.

Not sure what the brown sludge is exactly but I'm not enough of a chemist to know what sort of chemical reaction there could be between coolant and exhaust, somebody's mixed incompatible coolant types, or whether it might just be some corrosion.
 
  • Like
Reactions: Apparition
Take a closer look at your second photo. It's pretty obvious, and the reason for my rhetorical comment. Thought you might have been messin' with us :)

20220630_111349.jpg
 
  • Like
Reactions: Apparition
Thanks everyone I appreciate it. I purchased a new head but I'm guessing my old one is fine. The only problem I was having was exhaust in the coolant and crazy high IAT'S going put the new head on wrap my ARH and see how she runs. Thanks again.
 
Crashmymax said:
Thanks everyone I appreciate it. I purchased a new head but I'm guessing my old one is fine. The only problem I was having was exhaust in the coolant and crazy high IAT'S going put the new head on wrap my ARH and see how she runs. Thanks again.
Click to expand...

ARH?
 
Top Bottom
Back