![]() In all cases the rear internal face of the boss should protrude ~ 1⁄4” or 6 mm aft of the small end of the taper, which is the SAE and ISO standard, to ensure the nut pulls up on the boss correctly and doesn’t first bind on the thread giving only the appearance of correct mounting. Check that the taper length will allow the nut to pull the propeller tight on to the shaft. Wipe all mating surfaces clean and lightly smear with a marine grease including both keyways. Nuts on SAE 1.250” shafts protrude ~ 1⁄2” aft to allow for the fit of the spigot extension on SAE standard shafts. Mark the front face of the propeller on the taper in each case.Īll SAE 1.125” 1.250” 1.500" and ISO 40 mm units mount with the front face 0.250” 0.625” and 30 and 20 mm respectively down from the taper start. The unit must fit exactly with a neat fit to the taper and zero clearances on the taper surfaces. The boss will need to be lapped carefully with grinding paste to ensure a neat fit if this is not the case. The outer face of the key should have clearance and not be touching the matching outer recessed face of the boss.Ĭheck that the boss is tight on the shaft taper without any lateral movement even when pushed only lightly up the taper. This can be caused by insufficient depth in the keyway recess that has been milled into the shaft. This will show as the boss not returning to the same position as marked previously required - an indication that the key is binding and preventing the taper seating correctly. To ensure the key is sized correctly, mount the unit without the key, to ensure the taper is tight, marking the front face position on the shaft with an indelible pencil, and then again with the key to ensure it is not binding on the keyway which can then be ground down if required. Remove the key from the keyway on the shaft to enable correct mounting checks. Remove any burrs or impediments to the smooth operation of the nut. This will ensure the nut can subsequently push the rear face of the boss tightly onto the taper when mounted. The front face of the nut must come very close to the small end of the taper. Remove the nut with 1/2" square drive from the internal recess in the aft section of the Boss of the propeller by releasing the 2 x M8 locking set screws.Ĭheck the fitting of the nut prior to finally mounting the propeller with key by ensuring the nut will freely screw right down the thread. forumlist td.forum_title a.This section is also available in the OPERATING MANUALīefore fitting your new Kiwiprop™ to a shaft - first check that the shaft is free to rotate and can be spun easily by hand to ensure correct feathering. * Forum formatting (by -Algorithm & -Splaka) */īackground: url(/images/4/4e/Forum_new.gif) center left no-repeat ![]() * Giving headers and TOC a little extra space */ * Mark redirects in Special:Allpages and Special:Watchlist */ * Font url('/load.php?articles=MediaWiki:Base.css|MediaWiki:Otaku.css|MediaWiki:Wiki_Staff.css|MediaWiki:Navbox.css|MediaWiki:Portal.css&only=styles&mode=articles&action=purge') /***** CSS placed here will be applied to all skins on the entire site.
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