Sd-195 diesel engine replacement valves, catheters, pistons, piston rings, fuel injectors, after the plunger can not start, or the operation is not normal, knocking cylinder sound and crash sound is quite serious, demolition found: valve rod always bent At the top of the piston there is an impression of a valve collision and the valve clearance adjustment has also changed. Many people repair without fruit.
After this failure occurs, without dismantling the machine, remove only the cylinder head cover, turn the flywheel, and check the valve rocker arm to open the valve to the maximum, check that there is no clearance between the upper valve spring seat and the valve guide, and hit the rocker with a hammer. Head, so that there is a little gap! (>0.3 mm, not too large) Re-adjust the gap and trouble can be eliminated.
The main reason for this failure is: When the valve guide is installed, the top of the cylinder head is exposed, and the valve spring upper seat collides with the valve guide tube. This is also a lesson! Hope that the majority of repair teachers to replace the valve catheter can not be sloppy!
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