Simple shaft isloation test - Electrical and Corrosion

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Simple shaft isloation test

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halseyf		#1 Posted : Sunday, May 03, 2009 1:27:35 AM(UTC)
Rank: Member - Wooden Star Groups: Member Joined: 1/2/2008(UTC) Posts: 27 Points: -7		I am trying to find the old string on the best way to test shaft isolation. I put in new cutlasses and want to make sure everything still checks out. I am specifically looking for info on the most simple and acurate way to test isolation of the shafts and rudders. Any info? Thanks!
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Please Register : To weed out spammers, new members may not post until approved. An email is usually sent after approval. This forum is for Marinette Owners and other aluminum boat boaters who wish to share boating information. Aluminum Roamer owners are also welcome. (Do not post content you do not have the right to post and mass (robots) posters are unwelcome. We also have a marine electronics page and lots of Chrysler Engine info. State by what permission you copy content and give credit properly.) The site is now fixed with some more Chrysler information. We have space for pictures on the new location. Use shinkpic to autochange size http://www.onthegosoft.com/sp_download.htm Great Sites - http://www.marinette.com Marinette Company http://web.me.com/dougmrose/Doug_Roses_Website/Welcome.html http://fastjeff.tripod.com/ Repair Tricks and Techniques for Marinettes http://www.greatlakesmarinetteclub.com/ PLEASE post in the appropriate folder. Please, do not post your actual email address in publicly readable websites. The first rule is be a class act.
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pfhlaw		#2 Posted : Sunday, May 03, 2009 4:18:13 AM(UTC)
Rank: Marinette Royal Aluminum Poster (300+) posts Groups: Member Joined: 12/10/2007(UTC) Posts: 538 Points: 1,353 Thanks: 2 times Was thanked: 8 time(s) in 8 post(s)		Fields: A simple electrical multi-meter set to measure resistence will work. One probe on the shaft and one probe on the hull. Don't touch the metal probes with your hands or your body will register some level of conductivity. If the boat is out of the water there should be almost infinite resistance depending on the accuracy of your meter. In the water there can be a very slight reading caused by the water conducting electrons across the gap. I will try to remember to take baseline readings this week before and after we launch. Peter 1981 32' sedan bridge twin Chrysler 360 cu. in. 250 hp engines Raw water cooled Nimbus II Home port: New Buffalo, MI
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halseyf		#3 Posted : Sunday, May 03, 2009 7:28:29 AM(UTC)
Rank: Member - Wooden Star Groups: Member Joined: 1/2/2008(UTC) Posts: 27 Points: -7		Thanks Peter I went out to the boat to take a look at the way to test the shaft was and it was clear. However, the rudders are a bit different in my mind. What is the best way to check isolation of the rudders? I put one probe on the rudder (under the deck in the stern ,the very top of the stem where it sticks above the steering armatures) and one on the hull and my meter went to infinity. If the rudders do not appear to be isolated from the hull, what parts of the rudders or the rudder assembly could be contacting metal? Is their a process to identify what part of the rudder assembly might be making problematic contact? Thanks much!
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dougrose		#4 Posted : Sunday, May 03, 2009 10:00:23 AM(UTC)
Rank: Marinette Royal Aluminum Poster (300+) posts Groups: Member, Administration, Admin Joined: 12/7/2007(UTC) Posts: 1,332 Points: 1,746 Was thanked: 25 time(s) in 21 post(s)		Don't forget that a "high" reading on an ohmmeter is "no conductivity". If you have a mechanical meter, then the needle should read at or near the left when on the highest "ohms" scale. If you have a digital meter, then you should see a big number, or the over-range. On many digital meters, this is " 1--- " or something like that. 1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
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