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Old 02-22-2014, 10:46 PM   #21
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Seems they have been lucky because that hose clamp is not really good enough for the job. Any misalignment puts load one one side of the seal and will damage it. Any tendency to move away from the bearing housing (ie, through tight hoses etc.) will also damage the seal. Safest bet without replacing the housing is to drill & tap three equidistant holes in the bearing housing, align the pump, then dimple the pump housing with drill & fit loctited grub screws (do not over tighten). I've had to do this on numerous pumps on clients' boats over the years. The reality is that these pumps are often so shagged that complete replacement is the only economic repair. Housings & cam plates worn, shafts worn etc.
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Old 02-23-2014, 11:28 PM   #22
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I think I'll just put a better clamp on it and see how it behaves before I drop 500$ on a new one. The problem was with the lack of a gasket to the engine housing, leaking oil. Thanks for all the info guys, much appreciated.
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Old 02-24-2014, 07:23 AM   #23
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Good choice.
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Old 03-04-2014, 11:08 AM   #24
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I am about to do this impeller job myself on 2 80hp lehmans. one has a johnson f5b-9 the other a jabsco as pictured above...never done this before so I have some stupid questions if you dont mind me hijacking this thread. The coolant and raw water systems must be separate yes? How do I drain JUST the raw water? or do I just close the cock and open the pump? Is it better to remove the pump entirely for servicing or should I work with the pump on the engine? one is easy to access the other is not.
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Old 03-04-2014, 11:16 AM   #25
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I am about to do this impeller job myself on 2 80hp lehmans. one has a johnson f5b-9 the other a jabsco as pictured above...never done this before so I have some stupid questions if you dont mind me hijacking this thread. The coolant and raw water systems must be separate yes? How do I drain JUST the raw water? or do I just close the cock and open the pump? Is it better to remove the pump entirely for servicing or should I work with the pump on the engine? one is easy to access the other is not.
Coolant is separated from the raw water by the heat exchanger. Close the sea cock and remove the back plate on the pump. Some water will come out until the raw water side is drained. Impeller should be removable after taking off the back plate. If you are only changing the impeller, you shouldn't need to remove the pump.

If water keeps coming out of the pump with the cover off (couple of minutes), put it back on, you have a sea cock problem.

Ted
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Old 03-04-2014, 12:10 PM   #26
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thanks O C - on my way to the boat now...the only other impeller I ever did was on an outboard...a lucky meeting with an outboard mechanic at the time scored me a tip about installing it by rotating the shaft as it was pressed into the pump housing...worked great. anyone got any tips for this kind of job?
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Old 03-04-2014, 12:54 PM   #27
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thanks O C - on my way to the boat now...the only other impeller I ever did was on an outboard...a lucky meeting with an outboard mechanic at the time scored me a tip about installing it by rotating the shaft as it was pressed into the pump housing...worked great. anyone got any tips for this kind of job?
Joy

Before you pull the old one out, make a mental note which way the vanes lay. Greese or "never seive" the shaft before you slide the new impeller on (makes it easier to remove it next time). Wipe the inside of the pump housing and coat the impeller with Joy dish washing detergent. Makes everything slip and slide together easily. Joy is environmentally friendly, and won't hurt anything on your engine.

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Old 03-04-2014, 04:29 PM   #28
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The vanes will align themselves in the first revolution.
I never tried Joy, I always use Pam or similar cooking spray oil.
No pun intended
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Old 03-04-2014, 05:33 PM   #29
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Why not put them in in the right orientation and avoid that extra stress?

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Old 03-04-2014, 07:06 PM   #30
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thats what I did...got one done but did not have right screwdriver for the other ( I hate that!). the old original jabsco had an aftermarket 'quick seal or sure seal" or something like that and was attached with thumb screws just a little over hand tight...hardest part was getting on the starboard side of that starboard engine - access was difficult but Im a little guy...hard to apply any grease when water was continuously trickling out...thanks for the advise guys
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Old 03-04-2014, 07:43 PM   #31
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I use Dawn as impeller lube. Get some between the vanes with a stick or qtip, then roll engine by hand half a turn or so, makes impeller easier to pull.

Don't worry about which way the vanes point going in, they will straighten them selves out once motor fires. Soap suds out tailpipe tell you it is pumping.
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Old 03-05-2014, 10:04 AM   #32
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. anyone got any tips for this kind of job?
Note which way the vanes face and install the replacement the same way. They would realign when you start the engine but why not avoid that extra stress on the part?

Use glycerine or KY jelly as a lubricant on the housing and the impeller.

Use a plastic wire tie to compress the impeller blades (facing the correct way) to get the impeller started into the housing. The tie can be pulled off and discarded after the impeller is almost all the way into the housing.
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Old 03-05-2014, 11:00 AM   #33
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Every time you shutdown the engine, it kicks back a quarter turn or so and vanes reverse. Then straighten out on startup. That's why you can ignore vane position.

Zip ties also handy for squeezing vanes together.
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Old 03-05-2014, 11:31 AM   #34
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great tips guys...will try today on pump#2
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Old 03-05-2014, 12:08 PM   #35
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Thanks for keeping them straight, Ski!!!!

Folks, Ski will not bang on his own drums but I am here to tell you this is a very competent fella when it comes to recreational marine diesels. He is one of the most knowledgeable contributors over on boatdiesel.com....and there are some smart dudes over there. Anyway, he is likely too humble to beat his chest about what he knows...but he does know what he is talking about.

It's a pleasure(and an asset)to have you here, Ski!!!
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Old 03-06-2014, 12:42 AM   #36
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I agree..his advise was used today with total success. the zip tie trick worked great...just the kind of weird tip I like
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