How to check the crankshaft scooter repair
Faults crankshaft on a scooter , however, like any other vehicle , seriously affect the operation of the engine or to completely eliminate it work. That is why it is important to promptly identify the problem, fix it on their own or ask the shop for a qualified repair or replacement crankshaft .
In this article we will learn how to check the operation of the crankshaft , and will not affect the main bearings .
Start at the top of the connecting rod . For this purpose , benzene, or flushing fluid to clean the carburettor head from possible particles of oil or varnish . Then set the needle bearing into place and insert the piston pin , so how would you set it in the piston . Finger distribute the center and proceed to checkout.
We need to determine the vertical and horizontal clearance . The presence of horizontal play is determined by sliding your finger diagonally in opposite directions , with a small gap must be present. The most common failure is in the presence of vertical play . To determine this , we try to move a finger inside the bearing up – down .
Clearance between the needle bearing and the connecting rod upper head speaks about deterioration of the latter. In order to see this (if used B / U needle bearing and finger) , replace the separator and the piston pin on obviously new and perform operation again. If the play was gone, the final details are subject to change . If the gap is present , replace the full crankshaft, connecting rod sometimes only if the rest of the shaft are in good condition.
If the above check does not give cause for concern , it is necessary to check connecting rod . However, often the mutual wear takes place . Wash likewise lower rod head from possible particles of dirt , oil and petrol coke with or washing for the carburetor. Next, take out the piston pin and the separator .
Free rod head , hold both sides of the fingers , trying to determine the horizontal backlash . To do this, gently wiggle the connecting rod to the left – right. A small gap must be present and this is part of the norm. Now define the vertical play (the most dangerous) . To do this , you must set the rod exactly in the center , it does not touch the cheeks crankshaft .
Then gently try to move the rod up – down . At this stage it does not matter , there is a strong backlash , or barely noticeable , which is barely felt. It was his presence is a cause for replacement. Most of the run- rod crank cheeks can be accepted for play , so it’s important to spend some time this operation , each time exposing the rod exactly in the center , and excluding the beating .
Thus we have the basic checks that could indicate a worn crankshaft . However, there is one failure , known as the crankshaft runout . Simply put , this is its curvature . This fault is usually characterized by severe vibration of the shaft and the scooter as a whole. Run-out is checked for a special unit using specific tools , so to determine the exact value in the home is not possible. Axis deviation of 0.05 mm, the maximum allowable . After that, the shaft is subject to equalization or replacement if repair, according to experts, is impossible.