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Old 02-06-2015, 04:10 PM   #1
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The man...the myth...the legend!!!

I will be replacing my Sherwood pumps on my Cummins 6BTAs with Seaboard SMX pumps. The engines only have 650 hours on them and the starboard pump has already been replaced once before. I just don't want to have to worry about it. I will maybe use the starboard pump as a spare and sell the other one on EBay or something. Anyway, I got Mr. Athens on the line when I called and it was the first time I had talked to him. I have dealt with him online thru Boatdiesel.com but it was nice to be able to talk to him. He can sometimes be a bit sharp on line simply because he deals with the same stuff over and over and over. But super duper EXTREMELY helpful over the phone. Anyway, just nice to be able to deal with him in a more personal manner and glean a bit of knowledge from him. Seems like a great guy!!!
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Old 02-06-2015, 04:55 PM   #2
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Yes. Had a helpful conversation with him three years ago when we put the same pump on the same engine as you are doing. No leaks or problems with the new pump to date and impeller changes are much easier.

Replacing the pump meant lifting the port forward part of the Cummins off the mount a bit and that was a bugger as the mount's threads were all rusted from the leaking Sherwood.

I think I recall that the SMX has as slightly different shaped housing that will allow it to be removed without shifting the mount, but that may be just wishful remembrance.
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Old 02-06-2015, 04:57 PM   #3
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I think I recall that the SMX has as slightly different shaped housing that will allow it to be removed without shifting the mount, but that may be just wishful remembrance.
I read that as well. Hopefully that is the case!!! And hopefully I will never have to remove it again!!!!
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Old 02-06-2015, 08:25 PM   #4
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Slight thread hijack.

I had a similar type of fellow who advised me on installing a Victron inverter/charger.He didn't know me from Adam, but the time and patience he gave me in answering questions that he must have been asked hundreds of times before is very gratifying.

You hang on to people like that.

Now, back to the leaky pump.
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Old 02-06-2015, 08:28 PM   #5
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My CAT 3116s have Sherwood 1700 pumps. Wonder if these would fit as replacements. The SBMAR website only talks about Cummins.
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Old 02-06-2015, 08:45 PM   #6
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I believe they use the same impeller

The Cummins pumps are gear driven off the timing gears, is yours belt driven?
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Old 02-06-2015, 08:57 PM   #7
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No, they are not belt driven. They are gear driven
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Old 02-06-2015, 09:53 PM   #8
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There's a fair chance they would fit on the 3116. Ask SB. Base Sherwood Cat and Cummins are the same, but adapter plate and probably gear are different. Maybe swap the plate and gear from the Cat/Sherwood to the SeaMax?? Not sure if shaft noses are the same amongst all three.
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Old 02-07-2015, 01:17 AM   #9
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I've yet to have a problem on my new ( to me ) 6BTA (560 hours) but I'll be changing out my Sherwood with the Seaboard pumps.
I think I'll have to move/modify the motor mount though.
I'm lucky that Tony Athen's shop is 10 minutes from my boat!
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Old 02-07-2015, 07:07 AM   #10
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You mean those pumps have impellers in them..? And they need changing..? Actually I jest, but only slightly, because I had the impeller in the raw water pump on my trusty 1975 Lehman changed when I bought it 13 yrs ago, and as it appeared to be working faultlessly all that time, I only had it changed again while it was out December 2013. Admittedly we don't do huge distances, but anyway, they changed it, and the mechanic who did it, commented it was pretty stuffed. The interesting thing was it still performed as it always had right up to the time it was changed, and the temp reads exactly the same when warned right up to op temp as well.
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Old 02-07-2015, 08:21 AM   #11
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I'll echo Baker's experience with Tony on the phone. I've talked to him several times, super nice guy on the phone.

Both my raw water pumps are SeaMax - worry free now.
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Old 02-10-2015, 06:26 AM   #12
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Quote:
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The interesting thing was it still performed as it always had right up to the time it was changed, and the temp reads exactly the same when warned right up to op temp as well.
Pete, you have checked the temp gauge haven't you?
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Old 02-10-2015, 08:26 AM   #13
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Baker and HMason: You might both have pumps which are made to fit on SAE size A-2 mounting pads, originally engineered to connect hydraulic pumps to those engines in their industrial configuration. The SAE standard specifies the dimensions of the mounting pad (diameter, bolt spacing, etc.) and also the dimensions of the drive "tang" that the pump shaft engages on the accessory drive gear.

If that's the case, would you mind posting the part number of the raw water pump? I'm considering using an industrial engine on a boat, and it would be handy to be able to access a raw water pump for the wet exhaust. (At the moment, I'm kinda planning on a keel cooler, so no heat exchanger in the picture, at least yet.)

Thanks!

JS
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Old 02-10-2015, 08:34 AM   #14
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I have a 6BT5.9 210 HP Cummins. The guys at SBMAR have helped me several times. I had a belt slip issue with new alternators that they recommended a belt tensioner and pulley mod that worked great. They provided parts for a cooling mod that improved coolant flows. I just went to magnetic pickups for tachs that they provided. I enjoy knowing that what they tell me is they best option for Cummins.

I wish I could change my raw water pump set up. To change my OEM impeller you have to pull the pump casing. Its a PIA on the outboard pump. I don't think my 1989 210 HP 6BT will take the SBMAR pump upgrade.
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Old 02-10-2015, 09:36 AM   #15
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Quote:
Originally Posted by Driftless View Post
Baker and HMason: You might both have pumps which are made to fit on SAE size A-2 mounting pads, originally engineered to connect hydraulic pumps to those engines in their industrial configuration. The SAE standard specifies the dimensions of the mounting pad (diameter, bolt spacing, etc.) and also the dimensions of the drive "tang" that the pump shaft engages on the accessory drive gear.

If that's the case, would you mind posting the part number of the raw water pump? I'm considering using an industrial engine on a boat, and it would be handy to be able to access a raw water pump for the wet exhaust. (At the moment, I'm kinda planning on a keel cooler, so no heat exchanger in the picture, at least yet.)

Thanks!

JS
On the Cummins 6BT engine the raw water pump mounts where the power steering pump would mount on a (Dodge) pickup truck engine. It is a football shaped pad that mounts with 2 bolts below the injection pump.
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Old 02-10-2015, 11:11 AM   #16
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The Sherwood pump on my CAT 3116TA is a model 1700.
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Old 02-10-2015, 01:36 PM   #17
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Quote:
Originally Posted by fryedaze View Post
I have a 6BT5.9 210 HP Cummins. The guys at SBMAR have helped me several times. I had a belt slip issue with new alternators that they recommended a belt tensioner and pulley mod that worked great. They provided parts for a cooling mod that improved coolant flows. I just went to magnetic pickups for tachs that they provided. I enjoy knowing that what they tell me is they best option for Cummins.
Dave - we have the 2001 version of this engine (same HP, no aftercooler). I'm familair with the tensioner mod, but what is the coolant mod?
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Old 02-10-2015, 05:32 PM   #18
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Dave - we have the 2001 version of this engine (same HP, no aftercooler). I'm familair with the tensioner mod, but what is the coolant mod?
It involves increasing hose and fitting sizes on the coolant system.
Cummins B Series Coolant Plumbing

My engine is a 1989. Your newer model may not need this.
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