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Old 03-28-2017, 10:24 PM   #1
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Raw Water Pump Lube Thingy?

This is on both of my Perkins 6.354 raw water pumps. Opposite end of the impeller. It's got a zirc fitting for lubrication and two wires coming from the cylinder. I haven't traced the two wires to see where they go yet, but thought someone might know what this thing does off the top of their head? I can't read anything on the label.

Sorry about the sideways pics. My iPhone always does this even if I rotate them.
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Old 03-28-2017, 10:40 PM   #2
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Greetings,
Mr. F. In lieu of any other opinion, yes it's a thingy...

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Old 03-28-2017, 10:51 PM   #3
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My first thought was a solenoid of some sort but no idea what it might do. It also looks like a tachometer drive, but that doesn't seem right either.


I'll be following this thread with interest.
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Old 03-28-2017, 10:54 PM   #4
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The second photo is looking down on it with the red cap removed?
I'm back to tachometer drive.
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Old 03-28-2017, 11:09 PM   #5
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Quote:
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The second photo is looking down on it with the red cap removed?
I'm back to tachometer drive.
Yes. Second photo is with red cap removed.
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Old 03-29-2017, 03:00 AM   #6
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following with interest
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Old 03-29-2017, 05:28 AM   #7
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Sure looks like a tach drive. If the wires are plugged into it, remove the plug, start the engine and see if the tach works.

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Old 03-29-2017, 06:14 AM   #8
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Looks like a tach drive for a Glendinning Synchronizer
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Old 03-29-2017, 06:32 AM   #9
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You sure they are on your raw water pumps?

I agree they look like tach drives.
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Old 03-29-2017, 06:32 AM   #10
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Quote:
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Looks like a tach drive for a Glendinning Synchronizer
Agree.......
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Old 03-29-2017, 09:02 AM   #11
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I'm going to take a real swag and if it is indeed connected via a shaft to your impeller, perhaps it is some way to prime the salt water side without running the entire engine?
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Old 03-29-2017, 10:29 AM   #12
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Perhaps a devise that shuts down the engine if no water flow?
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Old 03-29-2017, 11:01 AM   #13
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It is definitely designed to accept a tachometer cable under the red cap.
It doesn't seem to be connected to the pump. In fact it looks like it's placed to make it difficult to change the impeller.
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Old 03-29-2017, 11:16 AM   #14
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I think Highwire nailed it. I found a picture of the piece with the grease fitting on the Glendinning website. Rotary Drive Components - Glendinning Products

My guess is that the black part is a tach generator that allows a mechanical tach cable to attach as well. The synchro would use a mechanical cable and the tachometer would us the electrical signal.
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Old 03-29-2017, 11:56 AM   #15
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That's a signal generator for a tachometer. If there was a Glendinning sync involve, there would be a tach cable hooked up to where the red cap goes. Zerk fitting is to lube the spinning gears.

Never seen one driven by a sea water pump.
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Old 03-29-2017, 01:22 PM   #16
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I do have digital tachometers on the flybridge and analog tachs at the lower helm. So the wires could go to the digital tachs. I'll have to see if I can trace the wires up to the FB.
I don't have a synchronizer. Next time I start the engines I'll remove the red cap and see if I can locate something spinning.
Thanks to all for your help.
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Old 03-29-2017, 02:35 PM   #17
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It is a tach generator that is driven off the front of the engine by the gear that drives the injector pump......
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