@koutsigarage: Checking for blowby on a 1HZ in an 80 Series LandCruiser 🔧💨 If you’re running a high-km 1HZ or just want to keep your diesel healthy, knowing how to check for blowby is a must. Blowby happens when combustion gases sneak past the piston rings and pressurise the crankcase — and it’s one of the clearest signs your engine is getting worn. Here’s how to check it: Start the engine and let it warm up to operating temp. Once it’s idling, carefully remove the oil filler cap on the rocker cover. Place the cap loosely back over the hole (don’t seal it) or rest your hand lightly over it. What you’re looking for: * A slight pulsing or gentle pressure = normal * The cap dancing around or getting pushed off = moderate blowby * Constant strong pressure, smoke puffing out, or oil mist spraying = excessive blowby 🚩 You can also check the dipstick: Pull it out while the engine is idling. If there’s smoke or pressure coming out of the dipstick tube, that’s another sign the crankcase is pressurised. Other signs of blowby: * Increased oil consumption * Oily residue in the intake or airbox * Loss of power or sluggish performance * Excessive crankcase fumes (especially visible smoke) * Oil leaks from seals/gaskets due to pressure buildup Why it happens: Over time, piston rings and cylinder walls wear down. On engines like the 1HZ (especially if they’ve been worked hard or not serviced regularly), this wear allows combustion gases to escape past the rings. Important note: A little blowby is completely normal on older diesels — especially high mileage 1HZs. The key is how much. If it’s excessive, it could mean worn rings, glazed bores, or even a tired engine needing a rebuild. Quick tip: If you’re buying a used 80 Series, ALWAYS do this test. It takes 30 seconds and can save you thousands 💸 Follow for more real-world 4WD tips, maintenance checks, and bush fixes 👊 #80series #landcruiser #1hz #blowby #diesel

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Thursday 19 March 2026 12:48:39 GMT