Threaded block drain plugs
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=51886
Printed Date: March-12-2025 at 3:45am
Topic: Threaded block drain plugs
Posted By: 1985 Nautique
Subject: Threaded block drain plugs
Date Posted: March-09-2025 at 11:58pm
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At the end of last year, when I pulled the two drain plugs out of the block (1/4" brass) to winterize the engine, there weren't a whole lotta threads left in the block. I've already replaced the elbow from the water pump to the thermostat housing for this very same issue. Any ideas on how to fix this? Contemplating drilling out the diameter of the hole, tapping a 3/8" NPT hole, inserting a 3/8" x 1/4" NPT brass adapter, and loctiting them into the block. This would still allow the use of the 1/4" NPT plugs for draining the block at the end of the season. Please let me know how you have fixed this issue. Thanks!! ------------- Brian 1985 Ski Nautique "I've spent half of my money on women, liquor, and boats. The other half I wasted." |
Replies:
Posted By: KENO
Date Posted: March-10-2025 at 8:15am
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You should read the thread in the link below http://correctcraftfan.com/forum/forum_posts.asp?TID=46959&KW=drain+plug&title=stripped-rusted-drain-plug-hole" rel="nofollow - link Then after that, run a 1/4 NPT tap in the holes, whether you think it'll work or not  It's worked for lots of people with the same issue. |
Posted By: 2001SAN
Date Posted: March-11-2025 at 2:46am
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I had the same issue with the drain plug on my v drive. When I first winterised the plug literally fell out there was so little thread left. Ran the tap up it as suggested and been fine ever since. ------------- A little knowledge is a dangerous thing... 2001 Super Air Nautique 1989 Fairline Corniche 31 www.bannrivercruises.co.uk |