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Cutless Propeller Shaft Bearings

Cutless Bearing Clearances

and Replacement Guidelines

When do I replace my cutless bearing?

Cutless Propeller Shaft Bearings

   

Water Flow Rate Desired for Cutless Bearing: 2 GPM Per Inch of Shaft Diameter.

  

Replace Cutless Propeller Shaft Bearing:

When 1/2 of water V groove has been worn away.

Another indicator is when shaft feels loose in the bearing.

  

Bearings Tolerances:

The following are the standards established by the US Navy, according to BuShips plan number 810-1385664:

  

How to Install and Modify a Cutless Propeller Shaft Bearing

  

How to Choose A Propeller or Rudder Shaft Bearing and the Differences Between Bearing Types
    

Hole Drilling Diagram for Flange on Flanged Propeller Bearings

    

Shaft Clearance Tolerances for New Bearings

Shaft Size (Inches)

Shaft Clearance (Inches)

3/4"

thru

1 3/8"

+.003

to

+.008

1 7/16"

thru

1 7/8"

+.004

to

+.010

2"

thru

2 3/8"

+.006

to

+.012

2 1/2"

thru

3"

+.007

to

+.014

3 1/8"

thru

3 3/4"

+.008

to

+.015

3 7/8"

thru

4 1/4"

+.010

to

+.017

4 3/8"

thru

4 7/8"

+.012

to

+.019

5"

thru

5 3/8"

+.015

to

+.023

5 1/2"

thru

5 7/8"

+.017

to

+.015

6"

thru

6 3/8"

+.020

to

+.029

6 1/2"

thru

6 7/8"

+.022

to

+.032

7"

thru

7 3/8"

+.024

to

+.034

7 1/2"

thru

7 3/8"

+.025

to

+.035

8"

thru

8 3/8"

+.027

to

+.037

8 1/2"

thru

8 7/8"

+.028

to

+.040

9"

thru

9 7/8"

+.030

to

+.042

10"

thru

10 7/8"

+.032

to

+.044

11"

thru

11 3/8"

+.034

to

+.048

11 1/2"

thru

12 3/4"

+.035

to

+.050

12 7/8"

thru

13 3/8"

+.037

to

+.052

13 1/2"

thru

14 1/2"

+.040

to

+.055

14 5/8"

thru

15"

+.042

to

+.058

     

Bearing OD Clearance Tolerances for New Bearings:

Bearing OD (Inches)

Tolerance (Inches)

1 1/4"

thru

2"

+.001

to

-.001

2"

thru

6"

+.002

to

-.001

6"

thru

7 1/2"

+.002

to

-.002

7 3/4"

thru

12"

+.005

to

-.005

12"

thru

16"

+.006

to

-.006

16"

thru

18"

+.008

to

-.008

  


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