Back From the Dead!

[RCObill1]

1992 Nissan 15hp 2 stroke NSB152 Long Shaft. This motor was left in the bottom of a small dink with the lower end in salt water. The drive shaft housing and lower end were somewhat pitted and corrosion had taken a toll. The lower end was very difficult to remove and several bolts were rusted to the point the heads had to be cut off to remove parts. The lower mount brackets were broken and most of the rubber parts were rotted. The power head and everything under the cover appeared to be in pretty good condition and it was not frozen. I paid 100 bucks and guessed I could get it back in parts if needed but it looked like it could be saved. I Cleaned the Carb and filter screen and it started first pull. Also has electric start and kicks right over every time, very nice idle but could not run it for long as the water pump was shot. Anyway, everything is repaired, replaced, lubed and painted and I?m ready to bolt up the lower end. Last night I noticed the Water Pipe and Grommets are missing, this is the tube that fits over the drive shaft between the water pump and where the shaft slides up and into the power head. This appears to be a cover and only keeps water from getting to the bottom of the power head where the drive shaft enters. I think some repair shops may leave this off to make the lower end install easier and as the top end is above the water line this tube may not be required. Can anybody comment on this area, I?ll order the tube add install it to make it right but just wondering if this is common to leave this off.

 

[pvanv]

Re: Back From the Dead!

If you are talking about the exhaust pipe, yes, it is important for correct combustion chamber scavenging, and should not be left off. BTW, that actually makes it easier to raise the LU into position, as it guides the drive shaft up to near the splines in the crank.

If you are talking about the water pipe that routes the water from the pump to the power head, you MUST have that or you will not have cooling water.

 

[RCObill1]

Re: Back From the Dead!

Thanks for the comment

This is not the water tube that connects to the water pump and the exhaust pipe bolts to the top end and comes down into a different chamber then the water pump is in, it also does not lead to drive shaft splines. This is listed in the drawings as Water Pipe, it slides over the driveshaft and on to the top of the water pump where the driveshaft comes out, next to the water tube. No water is pumped through it, the smaller water pump tube is next to it on the pump. This shaft tube cover stays on the drive shaft and butts up to a housing that guides the driveshaft into the crank.

http://www.nissanoutboardparts.com/Parts-Books.html Item 32 page 66

 

[pvanv]

Re: Back From the Dead!

Gotcha. Yes, it will work OK with that tube off. Many have been left off over the years. Having it on keeps the driveshaft and lower crank seal a little cooler and cleaner.