1957 Evinrude Big Twin 35 impeller replacement help!!!

[whitty6071]

I finally got my motor to run at a decent idle. Now, I am not sure if its circulating water. I have the engine on a stand and its lower unit is about halfway submerged. It is in about 30 gallons of water, inside a plastic garbage container. when its running the exhaust causes the water to splash violently and i dont see a steady stream or any water coming out. i feel alot of air/exhaust, from the exit . im not really sure how it all works but maybe the impeller is bad. Or could i be in to shallow of water. can anyone explain how the cooling process works. i just dont wanna burn up my engine, after all this time to get it running. the water is just over the transom. help me

 

[joey maneri]

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

you should be able to put your hand on the cylinder head at all times. if its too hot to touch its overheating. you should at least pull the lower unit and check the water pump. its probably a pile of crumbled up rubber. if it happens to be ok its peace of mind.

 

[tmcalavy]

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

Don't fry that old girl...if you don't see water coming out of the large hole on the back of the leg, your impeller is not working. Not hard to replace. The water level should be up over the intake plate on the side. When I run mine in the barrel, I basically fill the barrel up...no question then.

 

[whitty6071]

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

thanks i will check the impeller. hopefully it is just jammed or somethin simple. can u still find impellers for this motor? does it have a impeller or water pump or both?

 

[Stachi]

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

thanks i will check the impeller. hopefully it is just jammed or somethin simple. can u still find impellers for this motor? does it have a impeller or water pump or both?

oh boy ........... the impeller is the heart of the water pump...before I would think about running that old sweetheart again , I would carefully dismantle the lower unit and inspect the water pump, removing the water pump housing and check the condition of the impeller... if it happens to still be in one piece , I would remove it , and bring it to my local marine parts dealer and try and match it up to something that will fit... if only to have a spare...good luck bro , that engine is older than I am...not by much, but still older than me...lol... lets see some pics of it !

 

[Chinewalker]

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

This goes for ANY motor that is new to you... Unless the previous owner can document that the waterpump was serviced and (at minimum) the impeller was replaced within the last year, REPLACE IT. Don't go by "it looks okay." REPLACE IT. Don't go by "it pumped okay when I tested the motor." REPLACE IT. It's cheap insurance!

 

[lindy46]

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

thanks i will check the impeller. hopefully it is just jammed or somethin simple. can u still find impellers for this motor? does it have a impeller or water pump or both?

Impeller is readily available at a Johnnyrude dealer, or right here in iboats:
http://www.iboats.com/mall/partfind...gd_poid=109115&gd_row=35&**********=605710635
Impeller is part of the water pump. The housing is on top of the lower unit, and the driveshaft passes through it. Once the lower unit is off, just remove the three small bolts which hold the water pump housing on, and pry up on the housing and remove it from the driveshaft. Impeller is inside. It is driven by a small pin or key in the driveshaft. Easy to replace. The housing seldom goes bad in those old motors but be careful removing the bolts. If they are stubborn, soak them with a little penetrating oil. They break off easily. Make sure the rubber grommet on the housing is good - the water tube fits into it. A little dish soap on it will make the water tube slide in easily when you replace the lower unit.

 

[jay_merrill]

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

The good news is that the water pump in that motor was also used in later motors, so you shouldn't have any problems finding an impeller or an entire water pump kit (housing, etc), if you need one.

While I agree that the housings are usually OK, sometimes they are not. Look for pitting on the inside from corrosion, especially if it has been a salt water motor. Also, if I remember correctly, there is an o-ring at the top of the driveshaft. Make sure that it is in place and is in good condition, before reassembly.

For removal of the gearcase, look for a rectangular plate (rounded shoulders) on the leg, with two screws in it. Once again, my memory is fuzzy, but it should be on the port side of the motor. Open that and look inside - you will see the shift rod connector. Remove the lower screw completely, so that the upper and lower rods can separate, when you lower the gearcase.

Although there are different ways of doing things, I like to loosen the larger bolt (top, down) on the back of the gearcase and then remove the six, smaller bolts (bottom, up) from it. You can then hold the gearcase with one hand, while loosening the large bolt with a rachet and/or your hand. During reassembly, I do this in reverse.



???

 

[whitty6071]

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

I guess i got to drain all the new gear lube i just put in it huh? So I am going to start disassembling. I am really clueless on marine outboards. Im only 22 and I have tinkered on motors all my life. I baught this motor from my old mechanics teacher from high school. I only paid 25$ and had no idea what to do with it. I pulled out the air intak, then the cab. It was surprisingly clean. The motor had a mice nest in it and it smelled horrible. I realized recently that the tiller handle conector was broke off. its a big part of the motor to just replace easily. I was'nt sure how to start on a impeller replacement. im guessing drain it and then pull the prop off first. then the bottom fin part with 6 screws? then work your way up. I have pictures now and i dont wanna start this without some help. please post i wouldn greatly appreciate it. another thing. the barrel of water had alot of oil/grease in it after running it several times.....problem? i will send pics as soon as i figure out how to. there on my computer but i dont know how to post them. hold on

 

[jay_merrill]

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

You do not have to remove the prop and drain the gear oil. First, make sure you understand which bolts to remove - I am not talking about the screws in the lower gearcase half! Don't take that apart!

Do yourself a favor and get a factory service manual before you attempt impeller replacement. It obvious to me that you, as you said, know nothing about OB motor repair. There is nothing wrong with that, but you need to educate yourself a little before tearing into the motor - there is just too much that you can screw up through lack of knowledge.

Try right here at iboats for a manual. If you can't find one try EBay, Ken Cook, etc.



???

 

[whitty6071]

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

here we go i have more but this was a start.....

 

[whitty6071]

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

couple more. i have a old johnsons sea horse 10hp. runs great. not sure what year. think maybe a 1962 but im not sure

 

[whitty6071]

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

Re: 1957 Evinrude Big Twin 35 running but not sure if cooling

oh sorry i finished reading all my replies. i wont spill any hypoid oilwhen unbolting those 6 bolts? i am starting that right now.

 

[whitty6071]

Re: 1957 Evinrude Big Twin 35 impeller replacement help!!!

i cant get the lower gearcase to seperate. i removed 6 hex bolts and a screw on the fin holding the connecter rod but its not coming apart.

 

[coolguy147]

Re: 1957 Evinrude Big Twin 35 impeller replacement help!!!

theres a little oval plate on the midesction on the side remove it and there should be 2 screws inside that our on the connector. remove the bottom screw. then should pop out

 

[tmcalavy]

Re: 1957 Evinrude Big Twin 35 impeller replacement help!!!

In your second pix, the bolt at the rear top...just up from the six hex bolts...did you remove that too? It has to come out too, then wiggle it around until it drops a little...be ready to catch it when it comes off/drops.

 

[jay_merrill]

Re: 1957 Evinrude Big Twin 35 impeller replacement help!!!

I recommend that you post a photo of the screw "at the fin" that you removed. Show the location that you took it out of also. I have a bad feeling that what you removed is the pin that holds the "shifter lever" in place. This is a part that looks somewhat like a cradle and is located inside of the gearbox. Its function is to move the clutch dog back and forth, in order to position it for forward, neutral or reverse operation. If you have pulled this pin, you have most likely created a problem for your self.

In the mean time, don't try to do any more work and don't try to shift the motor - you may get lucky and be able to put the pin back in place.



???

 

[lindy46]

Re: 1957 Evinrude Big Twin 35 impeller replacement help!!!

i cant get the lower gearcase to seperate. i removed 6 hex bolts and a screw on the fin holding the connecter rod but its not coming apart.

The Phillips head screw on the skeg? That is not the screw you want to remove. The shift rod connector is beneath a small oval window (held on by two flat head screw bolts) on the leg of the motor, above the lower unit bolts. Remove that plate. Then you need to completely remove the bottom bolt from the connector - that will free the lower shift rod, allowing the entire lower unit to come off. In addition to the six bolts which hold the L/U, there is a large bolt at the rear of the leg which goes in from the top. That has to be removed also. If you did remove the Phillips head screw, you'll need to put that back in once the lower unit is off. It pivots in a hole in the shift cradle. Lay the L/U on it's side and carefully move the shift rod until the holes line up in the skeg. Use a flashlight, and a small pick to line it back up. Then put that screw back in. Don't forget the O-ring on that Phillips head screw.

 

[whitty6071]

Re: 1957 Evinrude Big Twin 35 impeller replacement help!!!

ok i finally figured it out. i removed the impeller and housing. it was a little dirty and it was stuck in debrit. it was serprisingly clean and no damage is visible. the second rubber seal for the water tube outlet was still good too. i took some pics. does the impeller fit tight int the small hole in the housing? and should it spin clockwise or counterclockwise? should the fins spin like a fan as in the way the fins bend? do u think i can still use these parts? i will post pics soon.

 

[whitty6071]

Re: 1957 Evinrude Big Twin 35 impeller replacement help!!!

http://i831.photobucket.com/albums/zz233/whitty6071/IMG_0502.jpg
http://i831.photobucket.com/albums/zz233/whitty6071/IMG_0503.jpg
here are the pics. let me kno what u think?