1978 6 hp Evinrude 6804b Water

Boat water pump impeller Replacement

Changing an impeller is certainly not a disheartening task and it's the one that every boater should consider increasing their particular arsenal of Do-it-yourself maintenance. Altering and impeller, on many motors, typically takes lower than 20 moments even though you tend to be fairly slow. The absolute most complicated facet of it's use of the pump.Impellers are a wear product unfortunately they don't always abide by a "time" or "hours useful" routine. An easy accident like forgetting to open up the motors raw water intake can destroy an impeller promptly. They don't want to be operate dry in addition they dislike heat. If let it go for to long they are able to "toss" a blade or free a chunk that may lodge within the hose and/or heat exchanger. In such a circumstance you've got a much larger task in your arms of choosing the piece to stop additional damage or overheating issues.We change my impeller on a yearly basis regardless of problem. Some feel it is overkill and you'll should decide for on your own everything you maintenance schedule is. I look at it that way, impellers tend to be inexpensive insurance! I pay $16.00 for the impeller utilized in my Westerbeke diesel engine therefore takes about 8-10 mins to alter it. It took me twenty moments even when photographing it and the accessibility for my huge camera had been really difficult!

An over heated motor or a thrown blade can cost many, often more in both time and money than the few minutes as well as the "low" motorboat bucks needed with this quick upkeep. Heck, changing an impeller costs not as much as changing my engine oil and filter.. If you do it every spring, or each time you run it dried out for over a 30-45 second period, or under limited circulation because of a blockage in strainer or consumption system you should have a trouble no-cost impeller and do not throw a blade or lose flow because a worn impeller once again.


New Impeller System

This is the impeller kit i take advantage of during my engine. It comes that includes gaskkets, instructions and impeller lube which can be only glycerin.If you notice, the box does not state Westerbeke onto it. Westerbeke uses a Johnson pump on this certain motor and Hamilton aquatic shares the actual replacement system for it. They could for the motor too.The impeller in the remaining may be the modern one additionally the one regarding the right had been eliminated last autumn after winterizing the engine. I keep consitently the old ones, that are in good condition, as extra, extra spares. Yes, i really could buy this impeller through Westerbeke however it costs very nearly $38.00 vs. $16.00 at Hamilton Marine plus they are identical because of the embossed component number from the impeller it self.

I recommend keeping one fully brand-new replacement impeller on-board all of the time and no less than two gaskets as occasionally you will need to check out the impeller but it may well not need to be changed.

The Removal Of The Screws

As I stated this work is extremely, easy. If you can change oil or an air conditioner filter or cleanse a blender after making frozen "chick products" you can transform an impeller.Step 1: loosen the screws and take away all of them. If they're frozen or rusted use some PB Blaster but be REALLY, careful never to only spray it in! PB Blaster will consume pump seals, engine seals and motor gaskets for breakfast. If you need to utilize a penetrating oil I'd advise spraying it to the spray can cap then dab it from the screws with a q-tip.

Tip: buy your self some free face dish screws as you will always drop in to the bilge, to never be seen again, and it will do so leastwise opportune time. Murphy is often waiting for you...!

Pry The Plate Off

2: Pry the dish off. I take advantage of my Leatehrman knife blade for this plus it works good. There are many methods for getting the plate off exactly what ever before method you select be sure it will not damage the gasket mating surfaces.

Make sure to SHUT the motor intake seacock before prying off the plate or changing the impeller for apparent factors. Some liquid will deplete out from the hoses, once you pop the plate off, so a turkey baster, rags and or a sponge is good to have available to dry everything up afterwards.

Check For Use

The face bowl of a liquid pump can be viewed another wear product. When it is scored and used you really need to replace it or flip it. I keep a spare brand-new address dish on board in case. Even at Westerbeke's inflated prices it had been only $13.00 and once again is inexpensive insurance. Some pumps, like particular Oberdorfer designs, have face dishes with no "stamped" part numbers to them. In case the face dish is worn, as well as the contrary part does not have any paint or stampings, you can simply flip it around and re-use it. My Westerbeke face dish is well embossed and certainly will not be flipped.

Note that my paper gasket emerged off, except for one tiny chunk, in one piece.. That is not by-design but rather stupid chance... often you get fortunate!

Clean The Cover Plate

Before re-using the cover dish you ought to cleanse it and make the gasket surface smooth once again. To get this done i merely use Scotch-Brite pads. Make sure to eliminate all traces regarding the past gasket from both the pump human body face together with cover plates mating face. Becoming diligent in your cleaning responsibilities will lessen the potential for a gasket drip..

Ready To Re-Install

Once I cleaned this dish I made the decision that I would put in my new one as an alternative, and keep this as a support. The pictured plate has actually fairly minimal use and might definitely be re-used with success but also for the $13.00 I made the decision to go new.

The Old Impeller

In the event that you been reading, and attending to, you will know that We changed this impeller a couple of months ago in April and from now on, when I write this, it's just late July.So exactly why is this impeller currently cracked and ruined? That's a straightforward response. We had been motoring back zero wind on a spring wave time. Spring tides have actually a great feature that requires achieving far up on the shoreline and pulling every final little seaweed and deposited junk back off the coastline and to the bay. About a mile from our mooring I noticed the exhaust note modification like less liquid had been spit completely. We held a detailed watch on my water temp also it just moved up about 8-10 levels above normal before we got to the mooring. The next day we visited the vessel, cleaned the strainer and reamed out the intake hose pipe involving the strainer and seacock. It absolutely was truly restricting movement however it had not been running completely dry, just less. Plainly it had been enough to warm the impeller and harm it. As always, in a situation like this, in which it had limited circulation, I make a habit of examining the impeller.I happened to be really surprised that only a few minutes of limited circulation caused this kind of damage. Usually I would personally have stopped the boat and cleaned the strainer nevertheless the temp wasn't even at 190, it generally operates at 180, and then we had a hungry child agreeable thus I forced on.The main point here is this. In the event that you operate your impeller dried out, or with restricted flow, about check into it. Whether it's in good condition all it will cost you is an $.88 penny gasket. If it's bad, as mine ended up being, replace it. I might guess I most likely had another 5-10 hours before this 1 began throwing chunks!

Globe impellers tend to be reportedly capable operate dried out for brief durations however i've had two Globe impellers spin the hub preventing pumping completely. While I think the idea is fantastic i am some gun shy, having had two fail me personally. These world impellers might another option but do know for sure of my failures and that they are very nearly triple the price of the stock Johnson impeller.

Take Away The Impeller

As the notion of liquid pumps is the identical across companies the method of the way the impeller sits in, or is attached to the shaft could be various. This pump has actually a slotted shaft while the impeller has a screw that sits inside slot. To get rid of it I simply use my needle nostrils Vise hold pliers. It simply pops appropriate out and could never be any simpler.

Some pumps use set screws or c-clips. Impellers with c-clip retaining bands will need a couple of c-clip pliers. It is usually good to know very well what your pump looks like before you take it aside to possess right resources on hand. Many motor manufacturers and pump producers have actually online components guides that may show an exploded view and certainly will enable a sneak peek in to the of one's pump if your wanting to open it up..

Look At The Pump Body

Don't forget to check out the pump human body both for use and dirt. Operate your finger around the inside to feel for groves or rough places and provide it a good aesthetic evaluation.

Once you've done this apply some impeller lube towards little finger and lube within the inside surfaces associated with the pump body including the straight back wall surface as it's part of the impellers sealing surface while the impeller spins on it because it does the leading cover. Both rear of this pump and address dish must certanly be lubed before last set up or insertion associated with the impeller.

New Impeller

To install the impeller lube the entire exterior with the supplied lube (usually glycerin). Steer clear of the using petroleum based lubes while they may shorten the life span of impellers compound. After lubing compress it along with your hands aligning the vanes when you look at the course these were focused when the old one came out.I frequently hear of individuals chatting of utilizing zip connections to pre-compress the impeller for insertion but we in all honesty do not understand the reason why one could have to do therefore. I've changed impellers on large Detroit diesels, Cummins, Caterpillars and also one lung teeny tiny Yanmar's and all of these impellers went back in good without a zip tie pre-compressing it. You probably need not over think the re-insertion simply do it.

If your impeller had vanes pointing in numerous instructions whenever you took it out, because the picture of this old one reveals, DON'T BE CONCERNED. This is certainly instead regular and it is due to the little "back spin" a diesel could possibly get whilst shuts down. Often during the last transformation the engine might actually spin right back a notch or two inducing the impeller blades become out-of spin path unison. Also people put it in totally backwards of the pumps rotation it could correct itself without any long lasting trouble. I don't advise this but the reality is that it won't in fact hurt a lot.

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