How can you tell if a Woodruff key is sheared?
SYMPTOMS. The symptoms of a sheared flywheel key range widely from a barely noticeable misfire to a no-start condition. In between these extremes the engine may misfire noticeably, run rough, backfire, be difficult to restart hot, or lack power. Advanced timing can cause engine overheating.
Why does my Woodruff key keep breaking?
if key is too large or inserted improperly, the key will keep the flywheel from fully seating on the crankshaft, even though the retaining nut is quite tight. other causes are burrs on either of the matching surfaces or wear. if the crankshaft is too small or worn or the flywheel hole is too large.
How tight should a Woodruff key be?
It is important for key to be somewhat snug and stable in the key seat. If key is not snug/stable then key can easily slide out of key seat due to the curved profile on the bottom. This is very inconvenient in cases where it is difficult to see as the pulley is installed.
What is the main use of Woodruff keys?
Woodruff keys are semicircular shaped, such that, when installed, leave a protruding tab. The keyway in the shaft is a semi-circular pocket, the mating part, a longitudinal slot. They are used to improve the concentricity of the shaft and the mating part, which is critical for high speed operation.
Why is it called a Woodruff key?
ETYMOLOGY OF THE WORD WOODRUFF KEY Named after the Woodruff Manufacturing Co, in Hartford, Connecticut, who first manufactured it in 1892.
How does a Woodruff key work?
Woodruff Keys are used for locking gears and pulleys to shafts. On the shaft, they fit into a keyseat, which is a circular pocket that retains the key. An exposed portion of the key fits into a rectangular groove, often called the keyway, in the gear or pulley.
Which key is fitted in hub only?
Explanation: Sunk key fits halfway in the hub and halfway in the shaft. 4. Hollow saddle key is superior to flat saddle key as far as power transmitting capability is concerned.
How do I change my Woodruff key?
You can try tapping a nail on one end of the key, drilling into the center of the key and removing it with a nail, or even heating the key up with a blowtorch and letting it cool repeatedly to loosen it. Remember that damaging the key is a far better alternative than damaging the shaft or other part around the key.
How do you remove a stuck key?
Turn the key so that the keyway slot is in the exact position it was in when you inserted the key; this is the correct position for the pin tumblers to align in the cylinder. With your other hand, use the tip of your finger to push firmly on the face of the plug next to the key. Gently twist and pull the key out.
How do you remove key stock?
The normal way to remove the key is to use a small cold chisel to impact the edge of the key in order to force it from its slot in the shaft. The exposed end of the key can be ground with a die grinder so that a “v” grove is formed in the end of the key.
What is standard keyway size?
Metric – Rectangular B.S. 4235 : PART 1 : 1972
| Nominal Shaft Diam | Dimensions (mm) | |
|---|---|---|
| 10 | 12 | 3.970 4.000 |
| 12 | 17 | 4.970 5.000 |
| 17 | 22 | 5.970 6.000 |
| 22 | 30 | 7.964 8.000 |