internal coolant leak
 

I have a 93 s-10 blazer w/a 4.3 vortec cpi unit it seems to be leaking internaly I replaced the upper gaskets within 10,ooo miles and had the heads shaved.head bolts are 5-7 lbs beyond specs and the intake is right on specs there is no coolant on the oil dipstick but is sighns onthe oil filler cap am going to replace intake gaskets as soon as i can but see this as an onging problem couse i realy can't find the leak there is nothing coming out of the exhaust but the usual.can anyone tell me were to go from here?[&o]i am totaly lost as what to do..[&o]

RE: internal coolant leak
 

Get a coolant pressure test done.

Check the transmission dipstick. If there is any rust on it, coolant is getting into the tranny. A new radiator is needed along with a tranny flush/fill.

RE: internal coolant leak
 

trans dipstick is fine replaced radiator within past year as well hoses are new heater core is new and not leaking upper hose is collapsing when i check fluids in the morning the pc valve is fine theres vacuum on the oil filler cap so thats fine no extenal leaks have ckecked with a fine toothed comb it leaves the intake or the heads .is this a well known problem for the 4.3?and what else can be done?:(

RE: internal coolant leak
 

Good, got the bases covered. Intake then. My old '98 was weeping the crap in the rer of the motor.

RE: internal coolant leak
 

yes bases are some what coverd is this motor known for this and what can i do to keep this from happening again in a few miles?can the intake be plained down?and the surface were the intake fits on the heads can they be plained down as well? still at a loss..:(

RE: internal coolant leak
 

How fast does the coolant leave the engine? (ie. 1 gallon over 100 miles...)

How much was machined off the heads when you had them decked? Did it look like the intake still matted up right after the machine work was done? Why did you have the heads decked? To ensure a nice flat head sealing surface? Also, why did you overtorque the head bolts?

RE: internal coolant leak
 

right know it only uses a few teaspoons of coolant .I don't know how much was machined off.but the person did say he seen some vallys in them and they were pressure checked at 70 psi and are /were ok i had them machined down and checked becouse i had this problem last year.everything matched up when i put it together and i over torqued the heads becouse i couldn't find new bolts and figured the old ones were streached. so far the coolant is not burning out the exhaust and it has not shown on the oil dipstick only on the filler cap..it the coolant is going back inthe overflow but is not being sucked back from it and the top hose is being sucked in...[&o]and the coolant doesn't leave verry fast yet ..

RE: internal coolant leak
 

If you install a PCV catch can, it may show some coolant traces.

RE: internal coolant leak
 

what is a pcv catch can???this is an internal leak so were would i put it???:eek:

RE: internal coolant leak
 

[color=blue]It's mounted externally. It suppose to collect even more of the oily gases that gets past the PCV. It should collect any coolant if any, that is in your engine oil. Hopefullly there won't be any coolant in there. clickety click.[color=black]