View Full Version : rebuilding outboard jet pump
Salmon Loser
01-20-2005, 08:29 AM
I am real sure I need to rebuild my jet pump on my 100 hp merc. So who does this I live in Salem so portland is not that far of a drive. Thanks for any input.
SL
Bait O' Eggs
01-20-2005, 10:48 AM
Are you thinking rebuild as it new impellor and sleeve? or the motor itself?
The sleeve and impellor is pretty simple for a do it yourself kind of person.
Replacing the bearing carrier isn't that hard either.
Boat Doc'
01-20-2005, 12:15 PM
Any repairs needed to the pump could be done by somebody with a mechanical aptitude, however you may run into seized fasteners that require care and heat to remove. You might try the Alumaweld dealer in town.
k9jeff
01-20-2005, 12:20 PM
I was recomended a shop in West Salem. He is in the book.
however you may run into seized fasteners
WILL
Salmon Loser
01-20-2005, 01:15 PM
Thanks for the input the motor runs great just sucked up to many rocks this duck season and it just doesn't seem to have as much get up and go as it use to. That's what happens when that gravel bar sneaks up on you at dark o thirty tring to get to that duck spot.I would like to do it my self but don't have any place to work on it. So will try to find a place to do it for me. Going to need it for springers soon.
SL
Bait O' Eggs
01-20-2005, 02:00 PM
Not sure about your pump, but I did mine several times in the driveway.
Drop off the shoe, (probably 6 or 8 bolts) getting the impellor off might be tricky if it is stuck. Kind of hard to grab a 3 fin impellor, a little heat might help, but dont melt the seal on the top side on the shaft of it or you will be replacing bearings sooner than later. If the impellor slides off fairly easy you are on your way. You can sharpen the top side of the fins to match the same profile they came with, that alone will help, or you may need a new impeller if it is pitted bad. Look at the wear ring bolted inside the shoe. If should be fairly smooth. If you find big divots and pits it may need replaced. A couple bolts and it is out. there is a plastic bushing inside the impellor against the shaft that may need replaced, expecially if you used some heat to get it off. :wink: Reassemble to desired tightness. There will probably be washers on both the top and bottom of the impellor that can be jumped from one side to the other of the impellor to make the impellor spaced properly from the wear ring. I have heard 10 - 15 thousands, As long as it dont rub and is nice and close you should be good.
Ideally you would just sharped the impellor and have no material cost, worst case scenario, some boat mechanic gets in your wallet and you know the rest :wink:
Good luck, if you need professional assistance, godspeed. :flowered:
Gizmo Man
01-20-2005, 08:37 PM
If your engine lost power all of a sudden, you may want to make sure you do not have any rocks in the bottom grate or in the outlet tube. Either of these, even one or two rocks will take you down in the power curve.
Giz...
Good point Giz, I had a "skipping rock" go up my grate and jam in my impeller causing flow restriction and loss of power. I had to pull the impeller to get it out and it dammaged the liner.
pump links;
http://scottandjenn.com/tiki/tiki/tiki-read_article.php?articleId=1
http://sites.state.pa.us/PA_Exec/Fish_Boat/boatcrs/jet/jetboard.htm
Beer Waggin
01-25-2005, 03:01 PM
Unless you damaged something, you just need to shim the impellor. Very easy to do as all the parts (washers) are inside the pump already. Switch the washers from the top to the bottom and you're on your way again.
An easy way to make sure the impellor is shimmed correctely is to coat the sleeve with Dykem or a colored marker. When you start to see scratches on the sleeve you can either back off by one shim (washer) or leave it alone and let the impellor wear to fit. Just make sure it's not to tight as you'll wear your impellor and sleeve.
When you take the file to the impellor, make sure you only file one side. I'd tell you which side to file, but I can't remember.
There is a guy in OC just north of Fisherman's that's very well known for his pump work. Only problem is getting him to work on it...
KChookem
01-25-2005, 07:51 PM
Salmon Loser...
Might give Dennis' Boat Shop in West Salem a call. He works on Merc, and recently became authorized to do Yamahas. If he can't do, he can give you someone to call.
Allen Marine does Honda's, and has done well on my prop motor, but I have no experience with them on jet pumps.
freespool
01-26-2005, 09:54 AM
Salmon Loser, Keta is right, you will have stuck mounting bolts. My pump had grease seal failure last spring, due to improper grease being applied by the bonehead boat operator. I tried to do it myself, but several of the bolts required a machinest extraction. Tom's Outboard specializes in jet pumps, cost me about $350, but I only lost a few days fishing. Plus he stands behind his work. :cheers:
salmon hugger
suckerfish
01-26-2005, 11:59 AM
I have overhauled a few pumps. Most of the pumps have fasteners that are stubburn in removal. Also the bearing carrier housing has a tendency to hang up in the pump. This can be a pain to pull but can be done with some heat.
suckerfish
This can be a pain to pull but can be done with some heat.
...carefully applied.
When reassembling smear the bearing carrier and the fasteners with DeOx and they will come apart better next time.