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Detroit 471 diesel head gasket Help
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Posted by Hobo,NC on July 17, 2005 at 08:09:32 from (67.141.239.254):
Got a good friend that has a 471 power unit to run his saw mill and think the head gasket izz leak'n. It never runs hot by the temp gauge but when under a load fer a few min. will start to push water out the over flow and build pressure (5 lbs or so) in the radiator along with lots of foam in the water, water flow izz very good and system holds pressure with no leaks. when running their izz a constant bubble of air so would lead me to think compression is leak'n by the head gasket. No water izz git�n in the oil and engine runs good, enny tips would be appreciated.
look'n at the engine it has housing on the front and rear of the engine that covers the ends of the head and I think they actually do dot seal to the head but do have a few bolts that bolt to the head. So my think'n izz to remove the front and rear bolts that go thru the housing at the head and the head would come off in a normal fashion. Correct me iffin I am think�n wrong �bout this.
BTW shoot'n the exhaust manifold with a temp gun the front cyl. runs 145 deg. and back 3 run 195 deg. ext. temp. the engine temp runs around 120 to 130 and no real temp difference in the out let of the radiator and i am sure the rad is not stoped up and fan has good air flow althow the fan belt could be thighter. I even went as far as to block the air flow up in front of the radiator to restrict air flow so he would not have to work the saw mill to load up the engine but it made no differenc in engine temp. I had to load the engine to git it to push water out the over flow tube. Water level izz not to high in the rad tank. I believe at the time of the diagnosis the thermostat wuz removed.
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