Though you might have to change the tubes if they go bad from age. It looks like a pretty easy job....but I know the minute I say that. We don't often refer to it as a "stuffing box" but more commonly call it a "prop packing" or "prop shaft seal". 04-23-2010, 01:26 PM #7. Lew Barrett. By the way, you need to take those readings at cruise rpms. Ninety percent of all sailboats with auxiliary inboard engines have a flexible stuffing box with traditional packing gland that usually goes unattended until it ⦠Harbor Freight has a very inexpensive set of picks that will make this job easy. If the pump uses a flush injection and lantern ring be sure to remove the lantern ring and the packing below it. I went online to find more information on how to repack the driveshaft stuffing box and found what I think is a good site with a very good graphical explaination. Im sure you meant change the packing You never have to change the gland itself. The stuffing box is a critical part of the boat. These units are often deep down in the boat, behind the engine and with limited access. You can add to the likely resulting damage rusted shaft/transmission couplings that will have to be cut off and replaced the next time you have to pull a shaft. Quite often when removing old through hulls I have seen 'black holes' which is mainly a sign of rotten laminates and in those cases the cut out has not been coated before installation of the through hull. The stuffing box is the seal around a boatâs propeller shaft that keeps the water out and allows the shaft to rotate freely. Link to post. Repacking equipment during a system outage is often performed under time constraints. Can you guys take a look at this site and tell me if that is pretty much what I am going to see on my boat? Like the guys said just tighten it up until it drips about 1 drip a minute. For example, if the stuffing box you are packing has a pressure of 30 lbs., you need at least 50 lbs. I like to be able to keep my hand on the stuffing box without being too hot to touch. It is a reliable option to hold your packing seals and shaft as well as keep your pumping system from leaking. The importance of knowing the proper cleaning and packing procedures becomes evident during a shutdown event when you need to keep your pump running efficiently. 04-23-2010, 02:11 PM #16. All because of a stuffing box throwing water and the lack of an ounce of prevention that costs no more than $5.00 and a half hour of time. It allows a driveshaft to spin through the hull without allowing water to pour into the vessel. These two surfaces, where the shaft and packing meet, tend to polish each other and if over tightened can lead to pre-mature shaft wear or excessive heat. stuffing box You said change the stuffing box right? A stuffing box that's cool at 2000 rpm might be too hot at 3500. Lew Barrett. Instead, get to the bottom of it! footnlongline 3 footnlongline 3 Crew Devotee; 3 ⦠A stuffing box separates the non-rotating parts from those that rotate. Quote; Go to top ; Share this post. of flush water pressure minimum. Resist the temptation to simply remove a few rings of packing that are near the top of the stuffing box. In order to establish the proper flush set-up, you must know the pressures of the stuffing box and of your water line at the equipment. I've been told that anything over 120 degrees or so is too hot. This particular stuffing box is a 1 inch box from a 1985 Catalina 36 and uses three rings 3/16 flax packing. In continuation with previous article it is a guide in the usage of gland packings. 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