What does a shear pin do on an outboard motor?
An Evinrude outboard motor uses a shear pin to protect the propeller from accidental impact. The shear pin will break off when the propeller hits something underwater, such as a rock, tree stump, or other large or heavy object, allowing the driveshaft to keep turning while disengaging the propeller.
What is a motor shear pin?
A shear pin is a mechanical detail designed to allow a specific outcome to occur once a predetermined force is applied. It can either function as a safeguard designed to break to protect other parts, or as a conditional operator that will not allow a mechanical device to operate until the correct force is applied.
What does a shear pin do?
A shear pin (also known as a shear bolt) is a weak bolt that connects your auger to the auger shaft. That connection allows the augers to rotate, collect snow and send snow into the impeller fan where the snow is thrown from the chute.
Do Mercury outboards have shear pins?
However, Mercury has made so many significant advances — from the sublime to the simple — that improved the quality of boating, that the world of boating sometimes takes them for granted. For example, in 1952 Mercury introduced the first splined propeller shaft, eliminating the need for a shear pin.
Do Tohatsu outboards have shear pins?
Pack of three shear pins That fit all models of the Tohatsu and Nissan 2 HP, 2.5 HP and 3.5 HP two-stroke and four stroke outboards.
Why does my shear bolt keep breaking?
NO, The fact that the shear bolt is broken is an indication that the impeller or auger has impacted against something that the machine is not designed or capable of processing. The shear bolts are considered to be a sacrificial part to prevent greater damge from occuring to the gearbox or shafts of the unit.
When was the first Mercury outboard?
Mercury Marine® has been making world-class outboards and sterndrives for more than 75 years. We started back in 1939 in a small machine shop in Wisconsin, and we’ve grown into the largest builder of marine propulsion systems in the world. Number one on the water.
Are tohatsu and Mercury parts interchangeable?
So, if Tohatsu makes Merc, are the parts not interchangeable, is a merc shop not equally equipped to service a Tohatsu as it is a Merc if they are essentially the same motor.
How do you measure a tohatsu shaft?
Tohatsu outboard shafts are measured from the bottom of the engine mounting bracket to the cavitation plate on the lower unit.