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chrisrich...
chrisrich...

Posted: Thu Sep 01, 2011 11:53am

Post Subject: Stern Gland Problems

The stern gland on my Market Harborough 38' narrowboar leaks afterevery use; it drips heavily so requires tightening. It is a single screw thread 'C spanner type'. Although repacked 2 years ago(before purchase) there is only a little adjustment left. I bought some packing which appears too thick. 1. are there 2 sizes of packing? 2. is it safe to renew packing whilst still in the water or does the boat need to come out thankyou Chris

Tony-B...
Tony-B...

Posted: Thu Sep 01, 2011 2:03pm

Post Subject: Stern Gland Problems

You can roll out gland packing to make it one size thinner - use a wine bottle or something. Do not even think about liberating a rolling-pin from the galley. There is a good chance you will never be able to clean it! Packing typically comes in the sizes 1/4, 5/16, 3/8 inch or 6, 8, 10mm for narrowboats. Barge packing goes much thicker. It is important to remove the old packing before fitting the new otherwise you are likely to get rapid wear. I think it would be a good idea in your case to fit the new packing as rings (procedure in Maint. notes on Tb-Training.co.uk. If you are experienced in changing packing then yes you can do it perfectly well with the boat in the water but with an older boat the amount of water than comes in relates to the degree of wear in the aft bearing and the shaft. Certainly put lots of grease into the tube before starting the job and you may also like to use something like plasticine, cling-film, or mastic bandage wrapped around the shaft between the prop and rear bearing to seal the tube. Please remember to remove it BEFORE starting the boat. It would be a good idea to check the shaft alignment because if the engine is flexibly mounted collapsed rubbers tend to put the shaft out of alignment and cause excessive packing wear, as does excess wear in the shaft and bearings. Tony Brooks

chrisrich...
chrisrich...

Posted: Fri Sep 02, 2011 12:57pm

Post Subject: Stern Gland Problems

Many thanks for the advice, Chris

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