How to measure shaft on outboard motor

If its about five inches longer than that its a long shaft. Outboard Motors for Sale.

Use figures and measure your shaft please no confusion is possible with figures.

How to measure shaft on outboard motor. To measure your outboard motor shaft length measure from the bottom of the mounting bracket where it rests on the transom to the top of the cavitation plate this is the horizontal surface of the lower unit immediately above the propeller. Later in the article is an image that shows you exactly where to measure. To sum up there is a simple calculator of the shaft length for outboard motors.

Outboard Shaft Length Transom Height - Factors. The Factors indicates the adjustment affected by on your boat type the outboard working environment and the transom distance as discussed above. Helpful Hints - How to Measure for Outboard Shaft Length - YouTube.

For this matter the propeller shaft length is measured from the inner top side of the motors mounting bracket to the horizontal anti-ventilation plate thats above the propeller. Note that sometimes the anti-ventilation plate is called anti. Measure from the bottom of your outboards engine compartment down to the bottom of the cavitation plate – the horizontal metal wing above the propeller.

If the measurement lies between 19 and 21 inches its a short shaft. If its about five inches longer than that its a long shaft. The shaft lengths will usually be 15 short shaft 20 long shaft or 25 extra long shaft although some of the very large outboards may have longer shafts.

Measure from the top inside of the mounting bracket to the plate above the propeller. If measuring an existing outboard. Measure from the inside top of mounting bracket down to anti-cavitation plate above propeller this is the largest platefin directly above the propeller.

You will notice a variable distance in the listings below. Likewise how do I know if my outboard is short or long shaft. Measure from the bottom of your outboards engine compartment down to the bottom of the cavitation plate – the horizontal metal wing above the propeller.

If the measurement lies between 19 and 21 inches its a short shaft. If its about five inches longer than that its a long shaft. If you are measuring for a lower unit replacement and your original lower unit is off of the engine simply measure from the top of the waterpump to the top of your driveshaft.

A shaft length that falls closest to 15 inches is short closest to 20 inches is long and so on. The buyer is supposed to be aware about the boat measurements as it helps in deciding the best transom height. For short shaft engines the transom height should be of 15 inches for long shaft the height should be of 20 inches and for extra-long shafts the transom height is supposed to be around 25 inches.

Picture the outboard bolted on a transom. You would measure from the top of the transom to the cavitation plate. A short shaft should be around 15 a long shaft should be 20 and an extra long shaft should be around 25For some reason these measurements are not exact maybe plus or minus an inch or so.

The outboard motor shaft length and transom length need to match in order for the motor to be at the right height while it is operating in the water. Short shafts are 15 to 19 inches long. Long shafts are 20 to 24 inches long.

Extra long shafts are 25 to 29 inches long and extra-extra long shafts are 30 inches and above. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft.

Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. Long Shaft Extra Long Shaft and Short Shaft Outboard Motors. As you can tell from the diagram and photo the shaft length is from the top of the mounting clamp bracket to the bottom of the cavatation plate.

THE SHAFT LENGTH IS NOT FROM THE BOTTOM OF THE POWERHEAD ALL THE WAY TO THE BOTTOM OF THE SKEG THAT MEASUREMENT IS USELESS. Top of the engine mounting bracket insideunderside to the anti-ventilation plate. 2000 Yamaha OX66 250HP SX250TXRY 61AX103847T 1982 Grady WeekenderOffshore removed stern drive modded to be an OB.

Use figures and measure your shaft please no confusion is possible with figures. Standard shaft lengths are 15 20 and 25 38 50 and 63 cm. Those shaft lengths are an industry standard but there are exceptions.

For mid-range engines the most common shaft length is 20 508 mm. Just measure your boat from the top of the transom to the bottom of your boat to get the transom height. A 20 is considered to be a standard or long length.

I guess you could use a different size shaft for your kicker motor. But you would want to place your kicker mount where the cavitation plate is close to even with the bottom of your boat. How does one measure shaft length.

You should find values near 15 20 and 25 short long extra long. Although on my outboard I was never able to get an exact match when I measured it IIRC. I think I came up with something around 17 so it wasis a short shaft.

To do so you will want to measure at the exact center of the transom from the very top to the very bottom. If it measures 15 or with in a inch of that you will need a short shaft outboard. If it measures anywhere from 17 to around 22 then your going to want to go with a long shaft motor.

For electric outboards the shaft length is measured from the top of the clamp bracket to the center of the propeller. For gas outboards its measured from the top of the clamp bracket to the anti-ventilation plate. As you can see our XS is close to S from Mercury.

Our S is close to L from Mercury. Long Shaft Outboards and Short Shaft Outboard Motors Or 1 Measure the height of the boats transom from the center down to the lowest point of the hull. This will tell you the height of the shaft for the outboard.

2 Measure the outboard motor from the top of the mounting bracket clamp to the bottom of the cavitation plate over the propeller. Ideally to measure the correct shaft length needed for your boat. You should measure the distance from where the motor will be mounted down.

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