coolant flush
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Senior User
Joined: Sep 2004
Posts: 391
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From: brooksville, florida
coolant flush
Hi Guys.
Well i finaly did it, i flushed out my 1991 4.0 cooling system and what a hell of a job it was never in my life (50 years and 20 years working on motors) have i come across such a pig of an engine compartment to get at anything. I managed to cut a "t" into one of the heater hose lines just above the thermostate. I had bourght one of the flushing kits from the auto store, the connection for the water hose into the "t" was a peace of crap it was supposed to have a back flow preventer built into it but when i connected my water hose and run the motor it leaked water all over my electrics which then shorted out, so i spent the next hour drying the electrics and fixing the short before i could carry on with the cooling flush, needless to say i junked that back flow connection. So my advice here is, if you use on of these kits dont use the back flow prevention connection, it is usless. I got about a gallon of rusty dirty water from the motor though, strange thing is though this motor has never run on the hot side, i just flushed it because my freeze plugs were rotting out from the insde and i think it has a small head gasket leak, which i am going to have to fix, but in the mean time i have put in some leak stopper, the head gaskets will have to wait untill i can get the time to replace them but she is still running fine at the moment.
Well i finaly did it, i flushed out my 1991 4.0 cooling system and what a hell of a job it was never in my life (50 years and 20 years working on motors) have i come across such a pig of an engine compartment to get at anything. I managed to cut a "t" into one of the heater hose lines just above the thermostate. I had bourght one of the flushing kits from the auto store, the connection for the water hose into the "t" was a peace of crap it was supposed to have a back flow preventer built into it but when i connected my water hose and run the motor it leaked water all over my electrics which then shorted out, so i spent the next hour drying the electrics and fixing the short before i could carry on with the cooling flush, needless to say i junked that back flow connection. So my advice here is, if you use on of these kits dont use the back flow prevention connection, it is usless. I got about a gallon of rusty dirty water from the motor though, strange thing is though this motor has never run on the hot side, i just flushed it because my freeze plugs were rotting out from the insde and i think it has a small head gasket leak, which i am going to have to fix, but in the mean time i have put in some leak stopper, the head gaskets will have to wait untill i can get the time to replace them but she is still running fine at the moment.
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
cool cbr,
more than one way to skin an Aero cat
i gave up on those flush kits, too confusing
now i just pull the thermostat and radiator....use hose and blow back thru thermostat opening until clear....turn radiator upside down on lawn and use hose nozzle to jet blast inside forward and reverse then thru the cooling fins outside...i use low pressure to blow out the heater hoses and core...old men have to keep things simple
more than one way to skin an Aero cat
i gave up on those flush kits, too confusing
now i just pull the thermostat and radiator....use hose and blow back thru thermostat opening until clear....turn radiator upside down on lawn and use hose nozzle to jet blast inside forward and reverse then thru the cooling fins outside...i use low pressure to blow out the heater hoses and core...old men have to keep things simple
Elder User
Joined: Aug 2005
Posts: 996
Likes: 0
my 91 had a coolant leak that I thought was the head gasket. The head gasket was fine but the intake and front cover gasketry was junk and rotted. I think the head gaskets on these motors get a bad rap.
These are truly the worst engine installations to work on that I have ever seen. Thank goodness they are quite reliable. It is sad that all engines are getting that way.
Ken
These are truly the worst engine installations to work on that I have ever seen. Thank goodness they are quite reliable. It is sad that all engines are getting that way.
Ken
