Over pressurized coolant reservoir

[Ed Irving]

Had a break down couple weeks ago , just got around to repairs.
Pulled injectors and changed o-rings and glow plugs .
Started truck and it runs better than it has in a long time .
No rough idle and starts right up .
But now my coolant resevoir is over pressurized and spewing .
It was not doing this before I broke down.
Changed T-stat and still doing it .
Truck drives great .

Could I have missed a cracked injector cup?
I didn't visibly see any damages when I had the injectors out.

Please help

 

[greenskeeper]

Diesel in the coolant?

 

[DaveBen]

Greenskeeper has a good point. Diesel fuel will not get into the oil via a leaking/bad head gasket.