ok so i put a new head on the jeep. and hooked every thing else up. ran it and had a crap load of coolant come out of the extra hole on the head. it is located in front of bolt #14 (or in front of the last bolt on the drivers side). i was wondering if any of you all have had this problem and what size bolt you put in there (an old head bolt is too big) to stop the coolant from leaking.... from what i can tell the hole is fine threaded.

 

Got a pic? is it on top, at the rear next to the valve cover? If so it's for a temp sensor. early HO engines used a sensor in the tstat housing for the computer and one in the head for the gauge. I had to find a place for that sensor when I put a 97 engine in my 91. ended up putting it in a flat spot on the tstat housing.

 

so later Ho's didnt have that sensor in the head? only the one in the Therm housing?

 

97 on use the one in the tstat housing for both.

 

ok then i went to the parts store and the one they had was too big..... soo size of the bolt????? would be what?

 

you need a plug
it should be a pipe thread
1/4np
or 3/8np

 

ok I just looked a the one on my jeep and it 1/8 np
1/8 pipe plug
parts house or hardware store will have one

 

did you get it fixed

 

If you can't find a bolt just go to a parts house and get a sender for say a 91 and plug it with that.

 

yep i got it fixed.... it was a 1/8 NPT... thanks for all the help.

 

good
it sucks when a .20 cent part screws up your day