Posted by trucker40 on October 23, 2008 at 17:23:28 from (69.149.223.152):
In Reply to: injector tubes posted by Sara Ohlin on October 22, 2008 at 13:46:44:
I would start it up,warm it up,shut it off,pull valve cover,pull injectors and you can most likely see which one it is.Or you can pull the exhaust manifold and see if one cylinder is cleaner,or if you cant tell fire it up with the exhaust manifold off for a minute and the one leaking will probably be smoking way more than the others.If you find one leaking,put all of them in because the rest will be soon.You may want to look around for an exchange head somewhere,because that was a common practice at one time to just swap your head for one that had been rebuilt because there were lots of Detroit motors being used,and they had lots of cracked heads and injector tubes.Ive seen a 2 story pile of Detroit heads at a rebuild shop before,it was in Kansas City but I dont remember the name of the place,too many years,it might still be there and the price was reasonable,maybe less than what a shop would charge you to put in tubes.Sometimes the tubes wont leak until the motor is warm,sometimes they will leak anytime.Or you can use the pressure test somebody said to use.A cracked injector tube or head can cause pressure in the radiator,loosing water,if its bad enough of a leak.Those old Detroits like that,if the water pump goes out,and it gets hot,it can crack a head real easy,or injector tube,or both,usually both,or injector tubes just crack over time.
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