Overheating Problems.

  • Coolant level low. Check coolant level as described in chapter 1, if coolant is low, engine will overheat.
  • Leak in cooling system. Check cooling system hoses and radiator for leaks and other damage. Repair or replace parts as necessary. (chapter 3)
  • Thermostat stuck closed. Check and replace as described in chapter 3.
  • Faulty radiator cap. Remove cap and have it pressure checked.
  • Coolant passages clogged. Drain and flush the entire system, then refill with new coolant.
  • Water pump defective. Remove the pump and check the components.
  • Clogged radiator fins. Clean them by blowing compressed air trough the fins from the back side.
  • Engine oil level low. Check and add oil. (you don't need a manual for that, I hope?)
  • Wrong type of oil. If  you're not sure what type of oil is in the engine, drain it and replace with the correct type.
  • Air leak at carburetor manifold. Check and tighten or replace if necessary. (chapter 4)
  • Float level low. Check and adjust if necessary. (chapter 4)
  • Worn oil pump or clogged oil passages. Check oil pressure (chapter 2) Replace pump or clean passages as necessary.
  • Clogged oil lines. Remove and check for foreign material (chapter 2)
  • Carbon build-up in combustion chambers. Use of a fuel additive that will dissolve the adhesive bonding the carbon particles to the piston crowns and chambers is the easiest way to remove the built-up.
  • Otherwise, the cylinder head will have to be removed and decarbonized. (chapter 2)