Drive Shaft TIR Tool

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   I have the boat in dry dock (my garage), and am doing some pre-season maintenace on it.  I have been curious about my drive shaft and whether it is bent or not.  

So, to check it while it was in the boat, I went to Harbor Freight, and bought a TIR tool for $16.  Came home and rigged up a little device all held in place with my table vice to see if the shaft was straight or not.  It worked very well.  It gave me a reading of ~.003" from 0 on the dial.  So, I think it is in spec. I used a wooden dowl rod that I used my Dremel tool to carve out a concave on the end as a place for the threaded area of the shaft to ride on while checking. It all worked very well.  Not sure if this is a proper way to do this procedure or not, but, I wanted to check to see if it was at least in the ballpark.  

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davidg Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: January-07-2008 Location: NW Chicagoland Status: Offline Points: 2239	Post Options Post Reply Quote davidg Report Post Thanks(0) Quote Reply Topic: Drive Shaft TIR Tool Posted: May-29-2018 at 12:46am
	I have the boat in dry dock (my garage), and am doing some pre-season maintenace on it. I have been curious about my drive shaft and whether it is bent or not. So, to check it while it was in the boat, I went to Harbor Freight, and bought a TIR tool for $16. Came home and rigged up a little device all held in place with my table vice to see if the shaft was straight or not. It worked very well. It gave me a reading of ~.003" from 0 on the dial. So, I think it is in spec. I used a wooden dowl rod that I used my Dremel tool to carve out a concave on the end as a place for the threaded area of the shaft to ride on while checking. It all worked very well. Not sure if this is a proper way to do this procedure or not, but, I wanted to check to see if it was at least in the ballpark.

8122pbrainard Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045	Post Options Post Reply Quote 8122pbrainard Report Post Thanks(0) Quote Reply Posted: May-29-2018 at 6:33am
	Dave, As long as there isn't any movement between the boat and floor, your method will work. I use an indicator with flex arms and then clamp it to the strut and have the prop removed.. The .003 is good.
	54 Atom 77 Tique 64 X55 Dunphy Keep it original, Pete <

Drive Shaft TIR Tool

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