About a month my 3406e engine started to run hotter than normal. I found that the surge tank had split and system would not build pressure. I put on a new tank, pressure cap, and a new thermostat This helped but did not solve the problem. Prior to any problems, truck very seldom ran over 190*. Now it runs at 196* unloaded at road speeds, and loaded will run up to 212 on the slightest grade. When I got home today, temp was 196. Checked with laser gun: water pump was 196, thermostat housing was 195; top radiator hose was 190; bottom hose was 90. I'm thinking water pump. I removed the water pump, but can see no problem. Can a water pump go bad without leaking? Any help would be greatly appreciated.
Cat 3406E heating problem
Discussion in 'Trucks [ Eighteen Wheelers ]' started by silver dollar, Jun 21, 2012.
Page 1 of 2
-
-
Trucking Jobs in 30 seconds
Every month 400 people find a job with the help of TruckersReport.
-
The water pump impeller can slip on the shaft or become eroded. Have you checked your air bleed line from the engine to the surge tank to make sure it's open? Air in the water pump cavity can cause cavitation of the pump.
silver dollar Thanks this. -
-
The impeller might not slip until heated. The air bleeds will do all the bleeding for you when filling the system. Have you cleaned everything up front, radiator, CAC etc?
-
Thats my next task. I've been told to blow air from the engine side, and i've been told to use water. What do you think?
-
I use water but it's pressurized. You could use air then water but I would wash it well with a good detergent. Trash often gets hung up between the rad and CAC so clean and inspect it well.
silver dollar Thanks this. -
-
All the luck to ya!
-
-
To clean the radiator, take it to a truck wash and with soapy spray, spray it directly into the core, not at an angle, also put the fan on manual and the engine at about 1200 rpm. spray at about 6 inches from the grill and do a pattern slowly.
You want a metal bug screen, with at least a 1/4 inch opening I prefer a 3/16 one. Those fancy plastic screens do not work.
To check a water pump for slippage I have an adapter I put on the top heater hose out of the head and shut off the return tap and clamp the hose, deducting the rad preasure cap at 1800 RPM you should have at least 27 lbs preasure. Some will slip when cold, some when hot, You also want to change the cover plate for the water pump, if it shows any corrosion.
Just a thought!silver dollar Thanks this.
Trucking Jobs in 30 seconds
Every month 400 people find a job with the help of TruckersReport.
Page 1 of 2