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Blue smoke on Hino 300

elegantbread88

New member
Joined
May 23, 2025
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2
So my Hino 300 went through a flooded river crossing and had some water inside causing it to stall. I managed to get some water out, pulled out the heater plugs and it's starting. but there's this blue smoke coming out. is this normal? what should I look into? thanks for any advice!
 
If you see blue smoke coming from your Hino 300 after it's been exposed to water it likely means oil is burning in the engine.This can happen if water has gotten in causing problems like worn piston rings or valve seals.If the smoke doesn't go away it's a good idea to have a mechanic check the engine for damage
 
Sounds like engine damage to me. I suggest that even if it's starting, don't run it extensively. if you continue to run an engine with water contaminated oil or internal damage will only make things worse and far more expensive.

@MightyHino is right, get it to a mechanic who can check the extent of the water damage and ensure all fluids are clean and no internal components are compromised. hope this helps!
 
Water in the engine is called hydrolocking and it sounds just as bad as you think. The blue smoke is the universal sign of burning oil, so I'm guessing the watter did some damage. I don't mean to scare you but you might be looking at an engine rebuild or swap
 
Blue smoke? That usually means you're burning oil, probably because your piston rings or seals are shot, maybe from water getting in there. Don't drive it anymore! Go get the engine checked out pronto and see if any fluids are muckied up. You could have some big problems
 
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