Re: 1937 120 Water pump Packing nut - How tight?

Posted by TxGoat On 2023/11/9 17:10:35

The manual advises to tighten "just enough to prevent leaks". This seems to be trial and error. You do not want it too tight. Don't run the engine with the pump dry. I've had good luck tightening the nut with fingers until some light resistance is felt, then running the engine and checking for leaks. If it drips, tighten it just a little more with a screwdriver. Don't run the engine with the pump dry or the seal will be damaged. Fill the radiator to the top. My new pump dripped at first. Finger tightening, then tightening a little at a time, then testing, got it to hold nicely, and it hasn't leaked since. Be sure to oil the pump bearings as directed. It may take only a 1/4 turn or less to get the final adjustment. Proceed with care. After a few hundred miles, or whenever a drip is seen, it may take another fraction of a turn to keep it leak free.