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Old 10-15-2017, 11:53 AM   #1
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Shaft Stuffing Size??

Hi: I'm repacking stuffing box on my 77 MT 40 DC. Not sure how old it is but I've had boat 6 years. The job is tough -impossible without corkscrew tool. Check out attached pictures. Not sure what size to use? The new stuffing in picture is 1/2' and fits in well with a small gap. Anyone know what size to use??
Thank you!
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Old 10-15-2017, 12:53 PM   #2
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The 1/2" looks pretty good from here. What size came out?
Gland ID minus shaft diameter divided by 2 should give exact size.
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Old 10-15-2017, 04:27 PM   #3
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Thanks -Not sure the size of what came out but it looks like ~1/2" squashed for 10+ years...But doesn't shaft OD minus gland ID /2 make it half the size of the gap?
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Old 10-16-2017, 12:36 AM   #4
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What are the sizes of your shaft OD and the box ID.? The packing will be half that difference.

Example:

3" shaft OD and 4" box/gland ID means 1" difference so 1/2" packing.
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Old 10-16-2017, 10:18 AM   #5
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thanks ...Mechanic at my boatyard says it needs to be tight going in. A little larger than the gap...Thats also what I did on my rudder boxes.
Similar to this video:

...But... I'm reading a lot of posts where people agree w what you say and they all are saying 1/2 the gap. That is my issue/question/quandry...
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Old 10-17-2017, 12:18 AM   #6
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Assuming the packing isn't swimming in the gap it will expand if there is a bit of clearance and fill that clearance.

Just for safety you might ask if there is an ever so slightly larger packing such as 9/16"

Larger sizes are available but what the increments are I don't know above 1/2".
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Old 11-01-2017, 09:09 PM   #7
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Probably a little late to post this now however just in case...you can use an ordinary twist drill to size your packing. Just select a drill, 3/8" for example, and hold it against the shaft with the shank towards the stuffing box. If it's 3/8' packing the drill should just slide into the stuffing box.
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Old 11-14-2017, 09:15 AM   #8
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Update on Shaft Packing size

We used 9/16. It was tight going in - but worked fine.
thanks
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