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onan mdl4 impeller kit

  • Thread starter Thread starter JEw
  • Start date Start date
  • Replies Replies 7
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JEw

Member
Joined
Jan 24, 2017
Messages
10
Status
  1. OWNER - I own a Hatteras Yacht
Hatteras Model
50' CONV -Series III (1990 - present)
Boat is 1994 50c Anyone know the part # and where to order thanks I am 5 hours from boat.
 
When's the last time the pump was gone over and checked. Impeller aren't the only things that wear out. Smart move is to pull the pump and have it assessed. Bearings, wear surfaces and seals can cause catastrophic failure.
 
I believe I have a couple that I no longer have use for. I'm going to the boat today and will check.
 
Cummins/Onan MDL4 20 kW equipped with Sherwood raw water pump (Onan pump assembly 132-0275 or 132-0278), the correct raw water impeller is Part Number: 132-0293
The factory parts manual identifies:
  • Raw water pump assembly: 132-0275
  • Raw water pump service kit: 132-0276
  • Individual impeller: 132-0293
 
Cummins/Onan MDL4 20 kW equipped with Sherwood raw water pump (Onan pump assembly 132-0275 or 132-0278), the correct raw water impeller is Part Number: 132-0293
The factory parts manual identifies:
  • Raw water pump assembly: 132-0275
  • Raw water pump service kit: 132-0276
  • Individual impeller: 132-0293
I will take a look at which pump I have when I get to the boat. Thanks
 
Everything was functioning properly on my 8KW generator when it came time to replace the impeller at a normal service interval. After replacement, with the correct parts and done correctly, the pump would no longer would pump water. After a conversation with Scott and at his assist insistence, I replaced the old pump with the brand new one Scott sent me, voilà back to ops normal. So there is some value in having your current pump checked out thoroughly along with the normal service of the impeller.
 
On my 7.5 MDJE I had allot of problems with raw water pump. I was ordering new old stock OEM Impellers that would barely work at first, then stop working all together. I believe the rubber shrinks over time and they become out of tolerance. I started ordering new impellers from these guys https://staycoolpumps.com/index.html and everything has been great ever since.
 
I believe I have a couple that I no longer have use for. I'm going to the boat today and will check.
I didn't find the impellers I thought I had but I did find a brand new sherwood pump, I added it to my Onan parts thread in parts forum.
 

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