waterpump?

[readyakira]

Re: waterpump?

all together it took me 3hrs. But I ran into unexpected complications. If everything is as should be this job should be easy to do in under an hour. I hadn't been told but figured out is was easiest to install the impeller in the pump housing and slide the both down onto the shaft. It was very easy to see which way the blades needed to be. As a matter of fact after everything was done and I was cleaning up for the night the old impeller was still curved in the direction of travel a bit. I did the whole pump kit to be safe. You can get by with just the impeller if the plates are not scratched I suppose. But I didnt want to take any chances. Tommorrow is compression tests and carb cleaning... maybe by the weekend (mine starts on monday) the boat will be ready for water.

 

[readyakira]

Re: waterpump?

ahh reading another post about water pumps reminded me of a question. In the kit I got was an O-ring. the pump I disasembled did not have any place for this oring to go. I couldnt find a suitable place on the new one either...... hmm...

 

[McGR]

Re: waterpump?

Perhaps it's the o-ring that goes on the driveshaft (just under the splines)??

 

[moderator1]

Re: waterpump?

Or....possibly the o-ring that goes in the top of the pump housing. There's a small groove where the oring goes, and is held in place with a touch of type-M...Or yes, it could be the o-ring for the top of the drive-shaft.

 

[readyakira]

Re: waterpump?

is there a place on this motor I can throw a water temp guage? I would really like to have guages for this thing and this boat has nothing....

 

[rodbolt]

Re: waterpump?

Ron<br /> start another thread. we can assist but to many threads in one post gets to confusing for mush brains like me

 

[rdgallo]

Re: waterpump?

Rodbolt, I assume this message is for me. Sorry for complicating this post. I should have known better. Thanks! I will post a new topic whenever I get my boat out of storage and tackle this project.

 

[rwcreigh1]

Re: waterpump?

it should have three o-rings 1 goes in the pump and two are for the black plastic (tube)that the shaft slips in to.

 

[Dave Abrahamson]

Re: waterpump?

Originally posted by rodbolt:<br /> dave<br /> gotta ask ya to stop spreading misleading info. on that jonny like most all jonnys mercs and yams and zukis and almost all other outboards ther is not room for the blades to assume the correct position. if the vanes are installed incorrectly they stay that way..

Sorry rodbolt, I thought I had heard that they will assume the correct position upon first start. As a matter of fact...heard it here from bubbakat..hooty...etc... but I'll take your word for it since I'm sure you have us all covered as far as "hands-on time" on these motors. I'll try and be a little more careful when I open up my big pie-hole from now on <br />Just so ya don't think I make this stuff up.. <br /><br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=28;t=019910#000001 <br /><br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=28;t=029420#000001

 

[rodbolt]

Re: waterpump?

dave<br /> its no worries. some pumps actually can reverse. i believe the new style high volume low pressure merc types can but i have never tried it nor seen it tried. i have taken many merc,jonny yammy and zukis back apart,some after a so called pro did it, due to incorrect vane direction. even had the so called pro call me a liar. wont get into that one on this post. but I did have his customer standing at my shop 2 days after leaving his with an overheat problem above 2K. found the pump impeller installed with the vanes backards. installed a new impeller and no futher cooling proplems. have done it many many many times ofer the years. sometimes uou willsee 3or 4 vanes with a clockwise set and 1 or 2 with a counter clockwise set cause it worked for some years and was never checked. years ago there were some bi-directionalpumps but none in the past 30 years or so. years ago the old merc dock busters used to start the engine backwards for reverse, hence the name dock buster.and quite a bit of the inboard and stern drive crankshaft or belt driven pumps were bi-directional. but not on the outboards. next time you have yours apart look at the clearence between the tight spot between the pump housing and the center of the shaft hole and you will see.

 

[McGR]

Re: waterpump?

rodbolt, dave:<br /><br />I've always placed the vanes in the correct direction, just because it seemed like the right thing to do. However, I don't know how many times I've read statements on this site regarding the self straigntening nature of impellers. So, I felt compelled to search the site using the search critera "impeller direction". As expected, I came up with several posts stating not to worry about impeller direction. Some of these posts were by some pretty "heavy hitters" on the site including pros. Maybe its OK for some brands, not for others? Or perhaps this is one of those topics that can only blossom into one of the never resolved issues such as VRO vs. premix or synthetic vs. dionsaur oil. etc. etc. I guess for the time being I'll play it safe and make sure the vanes are aligned properly.

 

[Chuck Gibson]

Re: waterpump?

You guy's are awesome. I have been looking for info like this for a while..without luck. Can i use these same instructions for my 1978 Johnson 70 hp seahorse?<br />Thanks!

 

[McGR]

Re: waterpump?

I believe your 70hp will have a somewhat different setup on the linkage connection under the bottom carb. Nonetheless, take a good look at it and you should be able to figure it out. Also, you will have a single water tube as opposed to the dual on the older V4s. Other than that the procedure is very similar.

 

[Chuck Gibson]

Re: waterpump?

After taking a look at the motor, you are right about the different setup. The carbs are on the front of the motor and the linkage is on the side. Should the shifter be set to neutral during disassembly? What is the purpose of removing the shifting levors?<br />Thanks!

 

[McGR]

Re: waterpump?

The reason you need to disconnect the linkage is because the shift rod extends from the lower unit through the swivel mount all the way up through the lower cowling. Without disconnecting the shift rod you'll never get the lower unit off. The shift cable and various shift linkage components are located on the starboard side of the motor as you observed, but they ultimately should lead to the shift rod located under the bottom carb in the front of the motor. This is what needs to be disconnected. Leaving the motor in neutral should work fine.

 

[Xcusme]

Re: waterpump?

Just for the record, I too, like Rodbolt and others, agree that impeller vanes won't 'right themselves'.<br /><br />Here's an impeller I just replaced from a Mercury 25hp.<br />This clearly shows vanes A-B-C D were properly positioned.<br />Vanes E and F were pointing the wrong way.<br />Actually, these vanes have relaxed a bit, being out of the pump housing, but still clearly shows improper installation.<br /><br />