Water Pump (18-3320) Assembly Assistance needed

[g_speran]

Hello ALCON,
I purchased the Lower unit water pump (18-3320) from iboast.com for my Alpha One "Gen 1" outdrive SN: 0b698339. The water pump I received from iboats has 6 gaskets (5 paper type, 1 metal). The original one I pulled out of the lower unit has 4 gaskets (3 paper type and 1 metal). In addition, I have no clue where all these O-rings go that came with the new water pump. If you can assist me, please do help. Below are the pictures from the Old water pump (disassembled) and the new water pump (disassembled). I have made comments on each picture.

TIA,
Gary

 

[Don S]

Re: Water Pump (18-3320) Assembly Assistance needed

The pump kit has gaskets for several different applications. Use only the ones you need for your drive and discard the rest.

 

[ktbarrentine]

Re: Water Pump (18-3320) Assembly Assistance needed

Follow the instructions in the manual. (if you have the "right" manual, it does a great job of showing you what goes where). Logically, you will replace the same items removed. The kits generally come (from my experience) with an extra item here and there. One thing in your case, is the O-ring that would go near the top of your drive shaft (where it goes into the upper half seals). Looks to be one of the smaller o-rings near the lower right side of your second photo. No need to even try and replace that o-ring, because it will most likely hang up in the seal of the upper when you try and go back together, and cause problems (like letting water get into the splines). Later model Alpha drives dont even have that O-ring groove anymore. Does yours? Remember to follow the manual guidance for gaskets and seals (lubricants, sealants, etc) and how to make sure your impeller vanes are bent the "right" way when installing your pump cover. I'm sure others will chime in on this thread. I love replacing water pumps!

 

[ktbarrentine]

Re: Water Pump (18-3320) Assembly Assistance needed

man! Don always gets to the Point!!! and beats me to the punch! (You've also got a new upper-lower quad ring, and new gaskets for your gear-oil vent/drain plugs.... be sure to use 'em).

 

[g_speran]

Re: Water Pump (18-3320) Assembly Assistance needed

View attachment 152533Thanks for the replies.

I am so new to the boating scense so all of this is a foreign language to me. I do have the Clymer Service manual for the Alpha Drive and the service manual for the motor.

I know where the gear-oil vent/drain plugs are and will replace them...thanks

I do have a groove near the top of the shaft for an O-ring. So do you still recommend not putting one there. There was not one there when I removed it.

What and where are the "upper-lower quad ring".


TIA,
Gary

 

[ktbarrentine]

Re: Water Pump (18-3320) Assembly Assistance needed

Achris can chime in on the o-ring issue on the drive shaft (there are other threads regarding this issue...you can search them). Recommended not to put the o-ring there. Good that you dont have one there.... but I would look really close up inside the splines up in the upper half...that's where I found mine! (Loose). The "quad" ring is the oil seal between the upper and lower halves, on the starbaord side of the water pump at the joint between the two halves. This o-ring gives people trouble, especially if it slips out of place when putting your drive halves back together (your post-maintenance air-pressure test will help ensure you got this in place)...some people tack it down with a bit of grease or bellows adhesive.
Oh...and most important! Get rid of the Clymer manual!!! There are better manuals on-line for free (I dont have the link right here with me, but I am sure someone else can supply). Just sayin'! HTH!

 

[Don S]

Re: Water Pump (18-3320) Assembly Assistance needed

I do have the Clymer Service manual for the Alpha Drive and the service manual for the motor.

Those aren't manuals, those are used for kindling.

Download this manual. It's the OEM manuals, and will actually give you some useful information.

http://www.4shared.com/office/L17_ufPa/06__Drives_R-A1_83-90.html?

 

[g_speran]

Re: Water Pump (18-3320) Assembly Assistance needed

Thank you all for the replys and Thanks Don for the manual. I had followed the manual and got the water pump back together, I think . Just for clarification, once the water pump was reassembled, I was not able to turn the drive shaft easily, like I was able to do when the pump was not installed. Am I correct to assume that this is because the key has the impeller locked in place AND since the impeller is a VERY tight fit, this is preventing the drive shaft to be able to turn by hand?

Also, indeed I did find the drive shaft O-ring up un the upper unit. I was able to successfully remove it from the upper unit and installed the slinger on the drive shaft and then the new O-ring.

Any recommendation, tip, tricks on reinstalling the upper and lower unit back together?

TIA
Gary

 

[ktbarrentine]

Re: Water Pump (18-3320) Assembly Assistance needed

Yes...hard to turn because of the resistance from the new impeller. Did you get the vanes pointed in the right direction?

Why did you install the new o-ring on your shaft? the recommendation is to not install it. It will most likely hinder you when trying to join the upper and lower, and may lead to water leakage into the shaft spline area, due to deforming the water seal up there. Your choice, though.

Biggest tip for joining the two halves is to ensure your shift shaft stays in fwd gear (lower shift shaft turned as far as you can CW, and your prop shaft is locked CCW (and most people hold it that way with a bungee cord, if you still have your prop installed). Then make sure your intermediate shaft lines up properly with the lower shaft, and that you have installed the stainless steel washer on the lower shift shaft (typically falls off when people do this maintenance). If you need to turn the drive shaft to line up the drive shaft splines, you can turn the prop CCW and it will stay in fwd gear. I find it comes in handy to have help guiding things into place, and always be checking on things from the viewpoint into the exhaust plenum/shaft area from the front of the drive. If you leave your o-ring on the shaft, this is the view where you will see it hang up on the shaft seal in the upper housing. HTH and good luck!

 

[g_speran]

Re: Water Pump (18-3320) Assembly Assistance needed

I will remove the O-Ring as recommended. I will post it if I am successful or need additional assistance.

Also, where can I find the procedure or process for the post-maintenance air-pressure test will help ensure I have got the Upper/Lower unit in place properly?

I cant say enough abouth this forum. It is great to join a forum where individuals are more than willing, and patient, to assist others!

Thank you all so much

Gary

 

[ktbarrentine]

Re: Water Pump (18-3320) Assembly Assistance needed

Recommend you review the "stickys" at the beginning of this forum area.... it has just about all the info you would ever need for maintaining your drive....

here is the thread (in one of those stickys) that discusses the pressure test.

http://forums.iboats.com/showthread.php?t=233546

 

[ryan1978]

Re: Water Pump (18-3320) Assembly Assistance needed

Recommend you review the "stickys" at the beginning of this forum area.... it has just about all the info you would ever need for maintaining your drive....

here is the thread (in one of those stickys) that discusses the pressure test.

http://forums.iboats.com/showthread.php?t=233546

I am also attempting to install this kit the lower housing is different have gotten to different sierra 18-3317 and 18-3320. The old housing was a large recess where the lower seal sits for the drive shaft (below lower housing) is this seal eliminated with the 3320 kit or do I have the incorrect parts. From all info I can get I have an alpha one no preload pin can not read and serial numbers 1985 wellcraft 23nova. Any help greatly appreciated.

 

[ktbarrentine]

Re: Water Pump (18-3320) Assembly Assistance needed

I am also attempting to install this kit the lower housing is different have gotten to different sierra 18-3317 and 18-3320. The old housing was a large recess where the lower seal sits for the drive shaft (below lower housing) is this seal eliminated with the 3320 kit or do I have the incorrect parts. From all info I can get I have an alpha one no preload pin can not read and serial numbers 1985 wellcraft 23nova. Any help greatly appreciated.

Ryan1978: Please copy and paste your post into a new thread.... Thanks!