I'm going to have my mechanic change the timing belt / water pump soon. Car is a 92 SC400 with 100k miles. Just bought it so I don't know what has or has not been changed.

Just wondering if I should have him change or replace anything else out in there while he has the engine apart?

 

Might as well do a full tune up while the timing belt covers are off. Caps, rotors, plugs, and wires if they are worn. Since you have to disconnect the radiator hose flush the coolant also. Check the idler pulleys as well for play and replace as needed and the water pump usually should be replaced with the timing belt as well. The last thing you want to do is have to take the car apart again.

 

Might want to do the Cam Seals and Front Main Seal (Crankshaft Oil Seal) also. Any oil seeping on the front of the engine?