Rudder Bushing
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=22017
Printed Date: November-20-2024 at 12:25am
Topic: Rudder Bushing
Posted By: Robb
Subject: Rudder Bushing
Date Posted: June-08-2011 at 3:06am
I am repacking the rudder, and I'm still a bit confused as to the purpose of the bushing in the picture. I found it inside the packing gland between one piece of rope packing and the threaded portion. I was told that it belongs on top of the gland, but I don't understand why. In the picture, I've got (3) pcs of 1/4" rope packing installed in the gland, and it seems to fit better than the 3/16". Is 1/4" correct?? It seems that the rope packing is what governs the rudder's height, not the bushing. So, do I need it? If so, should I remove one of the pieces of 1/4" packing in order to get it to fit correctly?
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Replies:
Posted By: 8122pbrainard
Date Posted: June-08-2011 at 9:00am
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Rob,
Spacers are used between the packing nut and the tiller arm when you have too much of the rudders shaft below the hull bringing the blade portion closer to the hull. The thickness varies by the position of the packing nut which is determined by how much packing you have inside the port. Do you have any of the shaft below the hull now? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Robb
Date Posted: June-08-2011 at 11:07am
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Pete:
No, the rudder blade is pretty much tight up against the hull. How much clearance do I need (how much of the shaft should be left sticking below the hull - 1/2" or more??)? The 1/4" packing seem to fit well, but I may need to take one out depending on what your response is. Thanks! |
Posted By: TRBenj
Date Posted: June-08-2011 at 11:39am
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You dont want any shaft sticking through the hull... you want all of the vertical play taken out if possible. This is what the bushing does. Since you were able to get enough packing in the gland to make the nut flush with the end of the rudder shaft, you probably dont need that bushing.
Do measure the gland though- 1/4" packing will physically fit in a 3/16" gland if forced, but it will tighten the steering significantly. ------------- |
Posted By: Robb
Date Posted: June-08-2011 at 11:47am
| When you say measure, what are you referring to? I wrapped the 3/16" packing around the rudder shaft and cut it, but when I installed it in the gland, it was short. The 1/4" fit perfect. |
Posted By: Robb
Date Posted: June-09-2011 at 1:38pm
| Should the rudder turn pretty freely, or should there be resistance. With the 1/4" packing, it is somewhat tight when moving by hand. I'm still not sure how one tells what size packing to use, so I might just go ahead and swap out the 1/4" with 3/16" to see how that feels. My shaft gland takes 3/16". |
Posted By: 8122pbrainard
Date Posted: June-09-2011 at 2:36pm
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Robb,
I wouldn't worry about the hand hard turning at the rudder. Check how it works when hooked up to the cable and helm. Unlike the prop shaft packing that's constantly subjected to the rotation, the rudder can be pretty tight. I'd leave the 1/4" in there until you get it back in the water. A convenient way of measuring the for the correct size packing is to see if ether a 3/16" or 1/4" drill bit fits down between the shaft and packing gland. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Robb
Date Posted: June-09-2011 at 3:30pm
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Pete:
Okay, I'll leave it alone for now. Unlike the shaft packing (due to constant rotation), I don't want any leakage around the rudder packing -correct? If I have less than 1/2" of shaft below the hull - is that okay, or should I grind down the bushing I have to take this up? Thanks for your feedback. I'm getting closer! |
Posted By: 8122pbrainard
Date Posted: June-09-2011 at 3:51pm
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Robb,
The less than 1/2" is pretty close in my mind but if you do want to get it closer, bronze thrust washers work better. They are the common method of shimming out the extra shaft length. 
They are typically 1/8" thick and you would get the 1" ID. A decent hardware store should have them in their assortment of bronze bushings. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: TRBenj
Date Posted: June-09-2011 at 4:12pm
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Pete, Im going to grab a handful of those now- what would you recommend for a 1-1/8" rudder shaft? Mcmaster only carries 1" and 1-1/4".
Edit: Im actually not sure which size rudder the M17 takes either. The 16' boats use a 1" rudder, but the larger SN's use a 1-1/8". Oh and one more thing- I sure wouldnt think that 1/2" of rudder post being exposed below the hull would be acceptable... the bushing that came off our BFN was < 1/4"- how tall is yours? I wonder if they sized them specifically for each boat? Either way, minimize that distance- the closer to 0", the better. ------------- |
Posted By: 8122pbrainard
Date Posted: June-09-2011 at 4:37pm
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Tim,
I checked too and it really surprises me that McMaster doesn't have the 1&1/8" as that is a common shaft size. They do however list a brass plain flat washer for a 1&1/8" bolt but they are thin and the cost is high. An alternate is to go to a bearing supply. They would have tons of "Oil-lite" bushings/thrust washers!! We are however using them simply as a spacer and this is not a precision application. The 1&1/4" would work fine on a 1&1/8" shaft!! ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Robb
Date Posted: June-09-2011 at 5:09pm
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I'm looking for no rudder packing leakage - correct?
I think the spacer I have is close to 1 inch tall, but it was inside the gland with one piece of rope packing. |
Posted By: 8122pbrainard
Date Posted: June-09-2011 at 5:38pm
Yes
None of us have seen this before!  It's sure not the normal set up. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Robb wrote:Posted By: karen
Date Posted: June-10-2011 at 2:27am
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Posted By: lewy2001
Date Posted: June-10-2011 at 11:04am
Karen you are starting to annoy me.
IP Address 212.104.212.16 Please type in dos command line:- ping 212.104.212.16 /l 2048 /n 50 ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: 8122pbrainard
Date Posted: June-10-2011 at 12:37pm
Mark, She got me going this morning as well!!  All 7 of "Karen's" posts were reported to Keith as spam!! ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |