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Bertram31.com General Bulletin Board
Re: Engine running a little hot
Posted By: Vic Roy In Response To: Engine running a little hot (STeveZ)
Date: Sunday, 15 May 2005, at 12:06 p.m.
It is a closed system. The steel tank on the engine should be full when the engine is cold. To get the radiator cap off it, press down when you unscrew it and it will come off. Since the coolant expands when it heats up, the radiator cap unseats and allows the excess coolant to pass thru the hose to the bottom of the plastic expansion tank. When the engine cools the excess colant in the plastic tank sucks back into the steel tank. If you are losing coolant, pressure check the system. If you can't borrow a tester, I have one I'll loan you. The steel tanks are prone to cracking around the filler neck and any radiator shop can repair them - the brass neck is known as a "GM style" neck. Another place this little system can screw up is a blockage in the small orifice in the bottom of the plastic tank - rust can plug it up. Remove the hose from the barb under the radiator cap and make sure you can blow air thru it. This is a critical system.
Also follow the other guys' advice and check the raw water pump impeller, blow out the gear cooler (put a big cup under the disconnected output hose of the raw water pump to catch debris) and clean the heat exchanger. When removing the pencil zinc, hold the big nut that's brazed to the underside of the exchanger (near the front) with a wrench while you unscrew the zinc with another wrench. The shell of the exchanger is not real strong and using two wrenches keeps the torque off the shell. Another place the 6B cooling system can crud up is the fitting on the back of the turbo where it makes the 90 degree turn with the cooling water.
All in all, the 6B cooling system is way simple and overbuilt, so just logically go thru it from your raw water intakes, seacocks, strainers, then to the pump. A blown impeller in the past can leave impeller peices in the grates inside the raw water pump as will as fragments downstream. The usually get caught in the gear cooler before they get to the heat exchanger.
UV
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