What does crankshaft runout mean?
The amount by which a crankshaft is bent. Runout is checked by supporting the crankshaft in V-blocks or rollers and mounting a precision dial indicator so its arm rides the end of the crankshaft as it is rotated. Runout is measured in thousandths of inches.
Which tool would you use to measure crankshaft run out?
Feuling Crankshaft Runout Measuring Tool 9015.
What is bearing nip crush?
The bearing crush (or nip) is the gap between the halves of the bearing housing after the bearing has been inserted and the housing properly tightened.
What is runout on a motorcycle?
Axial runout is ‘out of round’ or how much the rim moves in or out in relation to the axle it’s rotating on. It is measured the same way, you just point the dial indicator at the inside-facing side of the rim as shown in the lowermost of the service manual pictures above.
How to measure run-out of a crankshaft?
“Place the crankshaft in Vee blocks supported at the locations called out in the Table of Limits and using a surface plate and dial indicator measure the run-out at center main bearings. If this total indicator reading exceeds the dimensions given in Table of Limits… the shaft must not be reused.”
What happens when you shift the crankshaft on a car?
This shifting causes the crankshafts to become eccentric, causing excessive oscillation (run out) on the pinion and sprocket shafts. This results in the damaging of the cam plate, oil pump, cam chain tensioner and main bearings. On the 2007-Up engines, it also causes the automatic primary chain tensioner to over-adjust.
What does a non zero runout on a crankshaft mean?
First, verify that the datum axis is reliable by performing a runout inspection of the datum axis. A non-zero runout means your crankshaft journal is not round (oval) and changes your crankshaft runout measurement; It might increase or decrease it depending on the phase angle.
How long does it take to get runout out of crank?
There is some debate about measuring runout with the cam plate in place vis installed but, having measured both ways, if runout is excessive, the brass bushing on the pinion shaft will not stabilize a tweaked crank. Even if you had to remove the cam plate, plate, pump and cams will all come out as a unit; it takes about five minutes.