Help installing water pump kit

[jwilkey84]

I have bought the manual for my engine, but it is not specific enough for my likings. I have a 1975 evinrude 40 hp model 40555C. I am replacing the impellor and decided to just get a whole water pump kit. The parts should be here tomorrow, so I want to make sure I know how to put it all together. I just have a few questions. The manual says to put some sealer on the base plate before setting it onto the lower unit housing. What kind of sealer would be sufficient? Also there is a rubber bushing/seal in the center of all this mess with a round spring that I believe holds the seal tight against the drive shaft. It is dry rotted and I assume a new one will come with the kit. How do I remove it? I just wanted some help before I went after it with a hammer and a small flat screwdriver as it seems to be stuck in there. Also which direction should the veins on the impellor be going when I install it? I forget how it was when I took it out and all the veins were dry rotted and fallen off, But luckily I found all of them lying on the bottom plate. Any help would be nice, Thanks.

 

[Joe Reeves]

Re: Help installing water pump kit

(Gasket Sealers)
(Usually available at any reliable automotive parts type store)
(J. Reeves)

Do Not use any type of sealer on outboard carburetor or intake manifold gaskets as this would cause blockage of various fuel/air passageways. Also, there are new type gaskets, including head gaskets, which are used through out the engines that are coated with a substance that gives a shinny appearance to them. These gaskets are coated with a self sealer and are to be installed as is.... no sealers! Older style head and fuel related gaskets that are not coated with this substance are to be simply coated with oil.... nothing else.

All other gaskets (hopefully I've not overlooked anything above) should be coated with Gasket Sealer (the type that comes in a can that has a small brush in its screw off cap). This also pertains to some water pump installations that use a gasket between the plate and the lower unit housing.

Marprox Sealer 1000 or OMC Adhesive or Boat Armor Sealer 1000 (same substance) should be used on any metal to metal or metal to plastic surface (such as impeller hsg to plate) to eliminate air leaks. It should also be used on the Spaghetti tubing that is used on many powerhead crankcase halves, lower unit skegs, etc. I have found that this substance works quite well on various "O" Rings such as what are found on lower unit carrier and upper driveshaft bearing housings (Note that this substance is obviously not to be used on all "O" Rings).

DO NOT use any sealer on the large "O" Rings that are used on the upper and lower crankcase heads (The housing/heads that slide over the top and bottom of the crankshaft). On those "O" Rings, use only a coating of grease.

The exception of surface to surface contacts pertains to the later model matching crankcase (block) halves (which does not incorporate spaghetti tubing) which call for "Gel-Seal", or any other surface that calls for Gel-Seal. This substance seals in the absense of air, and if called for, must be used. One other form of Gel Seal that can be substituted is "Loctite #518". Nothing else that I know of will do!

I advise against using silicone or permatex on a outboard engine. It simply will not function properly. The exception to this (as per OMC's recommendation), is to use the black Permatex (heavily) on the gasket 306242 which seperates the inner exhaust tube from the exhaust housing on the 1959 35hp and 1960 to 1970 40hp OMC outboards.

http://stores.ebay.com/Evinrude-Johnson-Outboard-Parts-etc?refid=store

 

[F_R]

Re: Help installing water pump kit

The drive shaft seals (there are 2 of them) do not come with a pump kit. You may be able to yank them out with a slide-hammer puller. Be careful you don't break the gearcase if you go prying on them.

The drive shaft turns clockwise, and the impeller blades trail back.

Let us know if they send you a plastic pump housing. I'm interested to know.

 

[HighTrim]

Re: Help installing water pump kit

Also oil the impeller blades when installing, it will ease the start up. Your LU oil will be fine. It doesnt matter which way you install a new impeller, only when you re install an old one. IS there a rubber grommet on top of the impeller housing on that model?? If so, be sure that the water tube slides into it nicely when re installing. You can also add some gasket sealing compound to the impeller housing screws. Finally some marine grease on the splines of the drive shaft is a good idea when sliding it back up. If your t stats are out, now is a good time to blow some compressed air up the water line to clean out any debris that may be in there. Also make sure that the water intake is clean .

 

[jwilkey84]

Re: Help installing water pump kit

I'll let you know if they send a plastic housing with the kit. I am interested to see what all comes too, as there was no picture or description of the kit. Just out of curiousity, why do you want to know if a plastic housing comes in the kit? Also, how important is that rubber seal/bushing that the drive shaft goes through as it passes into the lower unit gears. That is the one I described earlier that someone said would not be included in the kit. Will I need a new one of those as well? It is still in one piece, but I can tell it is dry rotted and cracky.