pressure test your coolant system, if it wont hold pressure you most likely have cracked some part of the engine internally, hence leaking coolant into the oil
You could rebuild it if you had a rebuild kit. More than likely that would be hard to find. I would just replace the pump.
I would start with changing your themostate. If it continues from there, then look into your water pump, or vise versa
999.99
NEEDS CARB REBUILD OR FUEL PUMP KIT PUT IN.
It is a pump that keeps the domestic hot water circulating back to the hot water tank so that you have hot water quickly when you turn a faucet on.
You don't rebuild it, you replace it with a new one. You have neither the skill, knowledge or parts available to rebuild an electric fuel pump.
You can find a diagram for a water pump rebuild on a 2005 GMC Sierra 3500 6.6 liter diesel in the Chilton repair manual. You can also check local auto stores.
How do I rebuild a fuel pump for a 1991 350sd mercedes benz?
Go to the parts store and buy a new one. It's much cheaper than buying a hydraulic press to rebuild this relatively cheap part.
Engine is getting fried. Water pump failures are constantly not diagnosed.
Yes, there is a (sock) on the pump intake, keeps dirt and water out of the rest of the fuel system.
If it is making a noise or leaking then it is defective. The only real fix is to replace it. You can rebuild one, but it is not advisable.