For diesel engines the best injector/valve/lifter cleaner is plain old ATF added to the fuel tank. Way cheaper than the prepared crap and has more detergents. My old 2001 Chevy Altec bucket truck had a Cat 3126 with 7000 hours when I bought it. Injectors/lifters tapped like crazy! I added a...
Hah! Made me look up the coolant change interval on my Avant loader with a Kubota engine. Kubota says every 2 years and mine is 2 years old. Then I realized I have had my F150 for 4+ years and never changed that, either. So off to Amazon to order coolant for the truck and loader.
The reason I asked about coolant changes is because I have seen water pumps with the impellers eaten away from corrosion. They don't leak and look ok from the outside but don't push very much coolant. If this has come on gradually over a long period of time then the water pump is a distinct...
How expensive is the water pump? With the age of the machine, I would probably just change it anyway. How often have you flushed and refilled with fresh coolant over the last 19 years?
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