326693 SPACER, IMPELLER HOUSING, LONG. 20 INCH - Do I need it?
I'm changing the impeller on a 1997 25hp J25TELEUM. It is missing the 8" Spacer tube 326693 #64 on the diagram. Do I really need this part?
In another forum I found this description of the job of the spacer: The 8" Spacer tube 326693 is there to complete the isolation tube that runs from the pump to the powerhead. Purpose of the isolation tube is to keep exhaust and water away from the upper end of the drive shaft and lower end of the crankshaft, including the crankshaft seal.
As I see it - Looking at the engine midsection and the impeller pump housing, the two ends which the spacer ends will sit. The top part, the engine midsection has a bronze bushing (which shows nowhere in diagrams, so must be pressed in place at the factory), the driveshaft goes through the bushing (both are 5/8" diameter) and into a square casting that isolatates / separates the upper drive shaft from the exhaust. The spacer #64 then isolates from that bronze bushing to the impeller pump housing. I can't see how much if any exhaust can pass through the gap between the bronze bushing and the driveshaft. So I do not see the need for this 8" spacer on the top end, maybe the mechanic who worked on the engine before concluded the same? The bottom end of the spacer has a place for it to fit into and the O-ring to seal at the pump housing top, but I do not see how the top O-ring would seal since it'll just be in the air outside of the bronze bushing, the spacer tube mouth being the same diameter as the bronze bushing. The only seal would be how tight the spacer mouth rests on the mouth of the bushing, "kissing it".
On the top side the spacer fits inside of nothing and is sealed strictly by the end of the tube, the seal serves no purpose on this end. I do not see the purpose of the seal on that side. Both ends of the 8" spacer are identical O.D. in all the pictures. Is it needed on the impeller pump side, where it does seal? Do I even need this part?
I'm changing the impeller on a 1997 25hp J25TELEUM. It is missing the 8" Spacer tube 326693 #64 on the diagram. Do I really need this part?
In another forum I found this description of the job of the spacer: The 8" Spacer tube 326693 is there to complete the isolation tube that runs from the pump to the powerhead. Purpose of the isolation tube is to keep exhaust and water away from the upper end of the drive shaft and lower end of the crankshaft, including the crankshaft seal.
As I see it - Looking at the engine midsection and the impeller pump housing, the two ends which the spacer ends will sit. The top part, the engine midsection has a bronze bushing (which shows nowhere in diagrams, so must be pressed in place at the factory), the driveshaft goes through the bushing (both are 5/8" diameter) and into a square casting that isolatates / separates the upper drive shaft from the exhaust. The spacer #64 then isolates from that bronze bushing to the impeller pump housing. I can't see how much if any exhaust can pass through the gap between the bronze bushing and the driveshaft. So I do not see the need for this 8" spacer on the top end, maybe the mechanic who worked on the engine before concluded the same? The bottom end of the spacer has a place for it to fit into and the O-ring to seal at the pump housing top, but I do not see how the top O-ring would seal since it'll just be in the air outside of the bronze bushing, the spacer tube mouth being the same diameter as the bronze bushing. The only seal would be how tight the spacer mouth rests on the mouth of the bushing, "kissing it".
On the top side the spacer fits inside of nothing and is sealed strictly by the end of the tube, the seal serves no purpose on this end. I do not see the purpose of the seal on that side. Both ends of the 8" spacer are identical O.D. in all the pictures. Is it needed on the impeller pump side, where it does seal? Do I even need this part?
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