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Hoodys and swim trunks
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Discussion Starter #1 (Edited)
First off, I did some searching and besides alot of threads on "..my boat is filling with water, why?" and some thread about a world record jet boat jump :54: I couldn't find a thread that had some tips on removing the old packing from a jet w/o disassembling it.

I've had my jet for 2 years and aside from checking impeller clearances when it was apart, I am unaware of the condition of the packing. When it's in the water it'll drip slightly (as I've read is correct) but anytime the motor is running or I'm under power it has two distinct streams of water coming from the packing at the shaft. I can fill the bildge with a lap around the lake. I did a 1/4 turn on both nuts the last time I was out but it doesn't seem to make a difference. I could try another 1/4 turn, for a full 1/2, but won't know results until May at the earliest being most of the MI lakes are frozen.

Keeping the above in mind, I'm more apt to just replacing the packing with a fresh set and calling it a day. So, what are your tricks for digging the old packing out without disassembling the entire thing? The pump is a JC-A. I think I read that the packing retainer splits into two pieces after you remove the two bolt assemblies? How about getting all the old pieces out? Fish Hook? A special tool? A small grapling hook?

Thanks in advance!

-Dave
 

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Hoodys and swim trunks
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Discussion Starter #2
First response via text: "Dave- use a sharp drywall screw welded on a rod for your packings, screw it in and pull. Then get a real boat!!"

Those v-drive guys sure are touchy. :)hammers
 

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Pump packing material has alot of options with some of the newer stuff being made from carbon fiber. I would call one of the jet performance shops to get the replacements, the added benefit is the advice.
 

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Good ideas and good info here already , we use a tool we call the "hook" (snap on cotter pin remover) and a very sharp fillet knife (long skinny thin blade) work very well ! Tom
 

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There is a better seal made now and would prevent you from messing with that problem for a long time worry free.

Call Duane at Hi-TechPerformance he should have some in stock, I used one on my last pump and loved it!

I put one in a friends boat last summer and he has had great luck with it as well.

Scroll down and look for Mechanical shaft seal Hi-Tech Performance : Other Performance Parts
 

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If the packing is old, tightning won't stop the leak. replacing it is easy. they sell a packing remover tool that has a bendable shaft with a cork screw at the end, they come in different sizes for different applications. do yourself a favor and buy a set, they are fairly cheap. GRAINGER is a good place to get these tools and a roll of packing, the white teflon coated stuff works well and is not as messy as the grafite stuff.
 

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Hoodys and swim trunks
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Discussion Starter #9
Pulled 4 pieces of old, stiff and burnt up packing out of the pump using a combination of Harbor Freight picks and 1 5/8" drywall screws. The first 2 pieces came out with a straight pick jammed in and then leveraged against the housing. The last two required the screw to be screwed into them using a 90 screwdriver and then using a pair of pliers to yank them out. Thanks for the suggestions everyone.

 

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Pulled 4 pieces of old, stiff and burnt up packing out of the pump using a combination of Harbor Freight picks and 1 5/8" drywall screws. The first 2 pieces came out with a straight pick jammed in and then leveraged against the housing. The last two required the screw to be screwed into them using a 90 screwdriver and then using a pair of pliers to yank them out. Thanks for the suggestions everyone.

When you install the new rings, be sure to cut the ends at a 45* angle and overlap the seem. alternate each ring 180* from the first and seat each ring before putting in the next. when you do go out to break in the packing, tighten the packing gland nut hand tight then one turn at a time until you get 1 or so drops per second @WOT. shouldn't leak just sitting in the water.
 

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I have a learning quistion.

as i no expert but have be doing my pumps and some friends (AMT and Berk )
they all have had 5 packing rings

Is he missing 1 or do some only use 4????

or last rebuild the builder only put 4 in??? ( did not seat them and only could get 4 in):confused:
 

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For some reason I couldn't get all 5 in when I did mine. Now that I have ran it and tightened it a time or two over the last season.....I am gonna try to squeeze that last one in. Maybe he...or whoever put it together ran into similar issues.
 

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For some reason I couldn't get all 5 in when I did mine. Now that I have ran it and tightened it a time or two over the last season.....I am gonna try to squeeze that last one in. Maybe he...or whoever put it together ran into similar issues.
Be very careful when you try this! The housing will only handle so much packing and when you put the packing rings on DO NOT think you can pull them down with the bolts to make them fit! You may end up with broken packing rings! FWIW!

And I don't like the teflon packing! It doesn't last long as grafite and will go to crap quick if started out of the water!
 

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I have a learning quistion.

as i no expert but have be doing my pumps and some friends (AMT and Berk )
they all have had 5 packing rings

Is he missing 1 or do some only use 4????

or last rebuild the builder only put 4 in??? ( did not seat them and only could get 4 in):confused:
if you use the correct tool, it will come out!
check the manufacture drawing to be sure how many rings are supposed to be there...
here is what I use and how I cut and install them
 

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For some reason I couldn't get all 5 in when I did mine. Now that I have ran it and tightened it a time or two over the last season.....I am gonna try to squeeze that last one in. Maybe he...or whoever put it together ran into similar issues.
thats what i was thinking, or there is still one in there:idea: sometimes that last one gets so hard you think you got them all and with it still all together it hard to see.
 

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Ok how do you know if its bad or not I've heard mine crackle noises last season.


Its bad if, you run the packing gland down all the way and it leaks more than a few drop a second at WOT, or leaks not running at all. it is supposed to leak some to cool the shaft but not more than a few drops a second. heat and oxygen make it go bad...
 

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Hoodys and swim trunks
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872 Posts
Discussion Starter #20 (Edited)
I only found four in there and I double checked with a small mirror and LED flashlight so I could see all the way back. Thanks for the visuals jet pilot! Wrap the packing around the shaft first and then cut to length.

Corbin, every thread I've read has had different information regarding how to tighten the packing and when to know if it's bad. The general concensus I've put together is:
-If it leaks a few drops at WOT or when off it's fine, if you have a steady stream at WOT then it needs to be tightened.
-Tighten it a 1/4 to a 1/2 turn at a time evenly on both sides of the packing retainer.
-If you bottom out the threads and it's still leaking a steady stream then it needs to be replaced.
-Pull the 4-5 rings out with the tools above, or picks and screws.
-Buy a graphite impregnated or standard packing (Tom at Jetboatperformance.com has it for $22 currently) and cut it to length around the shaft.
-The cuts can be on a 90 or 45, it's personal preference.
-You can choose to lube them or not but use a sticky grease if you choose to do so.
-When you install them, alternate where the ends butt together i.e. 12-6-12-6 or 3-9-3-9.
-Install packing retainer until snug.
-Run the boat on the water and tighten nuts until desired leak rate is achieved.
 
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