Question about Sherwood Rubber Impeller Pump

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Pump p1722a rubber impeller pumpalways leaking &wearing shaft

I have twin cummins engines in a 14 mt vessell.the starboard engine pump has only required seal replacement in 12 years.the port engine pump is on the 4th or 5th pump due to the seals leaking causing the bearings to stick to the shaft causing wear.cummins nz do the service & each time this happens they install a new pump saying that to replace the shaft would be more expensive..my main concern is why only one engine continually has shaft damage.the latest seal leakage has occured after only 300 hrs of running.the starboard engine pump is still not showing any signs of leakageit costs me about $2000.00 each time cummins replace a pump.i look forward to your reply

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Hi and welcome to FixYa,

To my understanding, there could be 2 possible reasons why the seal would always go bad:

  • the impeller was initially damaged (missing vane for example) and transfer the uneven rotation/vibration to the shaft damaging the seal (possible but not likely to happen on the same engine multiple times);
  • driving gear issue. To my understanding, a Sherwood P1722APump is gear driven. 4-5 pumps on the same engine with the same nature of fault indicates something externally is causing the seal problem resulting in shaft premature wear & tear due to bearing failure. It is doubtful if the mounting holes and the bolting holes would be at fault. The only other component/part left that interacts with the pump would be the driving gear.
Series Engine Cooling Check and perform preliminary visual or necessary inspection. Pls post back result(s). Good luck and Thank you for using FixYa.

Posted on Jan 15, 2009

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Sir,

Just tap seal in until metal ring stops on seal housing.Just be careful when putting self tapping screws in seal not to hit rear seal housing and damaging it causing a leak path.

check this link for more info.

thanks
g.luck

Posted on Jan 15, 2009

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This sounds to me like there is another problem causing the seals to leak like a bent housing unit causing them to wear on one engine and not the other! Connings should have looked into the problem further! but I guess they look foward to your 2000.00 dollors after every 300hrs of use!
O would look for another repairman if you are not able to do it yourself!

Posted on Jan 15, 2009

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Dear McGint,     The problem is likely a mis-alignment of the pump and the impeller shaft.  The pump must be exactly aligned with the attached parts in the same manner as the starboard one.  The vibration and improper alignment is likely causing excess wear on the port pump.  I recommend measuring the parts and clearance around each pump.  Re-alignment of the port pump shaft or the attached parts may be required.  Please comment and let me know if this solution helps to solve your problem.     "Cummins" can only repair and reseal the pump.  Re-alignment of the parts the pump attaches to is another matter.   Measure carefully each part and the clearances, compare port and starboard clearances and shift the port side assemblies to match accordingly.    I realize this is easier said than done, please understand that the misfit alignment may now be compounded due to excess wear from continued non-alignment plus the resultant vibration of the adjacent port side assemblies.   best wishes,  Michael Mittelsdorf

Posted on Jan 15, 2009

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Posted on Jan 02, 2017

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Thank you for posting your question here on Fixya.com.


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