How to adjust the valves of the Aowei 11-liter 460?
2 Answers
According to the cylinder firing order, after determining that a certain cylinder's piston is at the top dead center position of compression, the intake and exhaust valve clearances of this cylinder can be adjusted. Turn the flywheel slightly in its original direction (to prevent the cam from pushing the pushrod), and then the valve clearance can be adjusted. This is because the valves open once every two revolutions of the flywheel, so the cam will not push the pushrod.
Ah, talking about valve adjustment reminds me of the time I helped my friend with that Aowei engine. This big 11-liter, 460-horsepower beast requires letting the engine cool down first before adjusting the valves, because the clearance changes when it's hot, and getting it wrong can easily cause problems. First, remove the valve cover—don't yank it hard, or you might damage the screws. Then, manually turn the crankshaft clockwise, watching for the markings to find the compression top dead center position, aligning it with the first cylinder. Remember, Aowei diesel engines usually use a feeler gauge to measure clearance—check the standard value in the manual, around 0.3mm is common. When measuring, insert the feeler gauge gently; don't force it. If the clearance is off, loosen the screws to adjust, then tighten and recheck a few times. The whole process requires care—too much clearance and the engine will knock, too little and the valves will stick. If they burn out, repairs are a hassle. I also recommend wearing goggles and gloves—engine oil splashing into your eyes is no joke. Regular adjustments can extend engine life; checking once a year is enough.
