MTU Raw water pumps

Your pumps are probably made by someone other than MTU. Possibly Jabsco, sherwood or the other popular brand whose name escapes me. Check depco pumps site.

x 2 on Depco

x 3 on Depco

http://www.depcopump.com

Somebody made the pump. Can not understand a non serviceable (or proprietary) water pump.
Are there any marks or numbers casted or stamped anywhere?

Pass on those numbers and some pictures. Also model/serial of the engine.
I may have another source path.

How bad shape they in? Leaking? Stiff bearing? Cam and end plates worn?
Hours?

I will probably learn a lil about these pumps myself.

Interesting. Same pictures from several old e-bay listings.

Interesting specs;
How much were you leaking?

Raw water pump – Relief bore
check
1. Check relief bore for oil and coolant discharge.
2. Stop engine (→ Page 50) and disable engine
start.
3. Clean the relief bore with a wire if it is dirty.
• Permissible coolant discharge: up to 10
drops per hour;
• Permissible oil discharge: up to 5 drops
per hour.
4. If discharge exceeds the specified limits,
contact Service.

Donzi 54 - Are you doing the work to change them yourself or do you have a mechanic you trust to do it for you?

Some 3rd Party made those pumps, they no doubt have a service agreement with MTU as does CAT and Jabsco to not supply parts of pumps to anyone else.

If you can either tale it apart yourself or have some you trust to do it ( without destroying it more doing so) talk the one that leaks the worst apart first and see what the actual problem is. Worst case scenario is you will need a new one anyway. How many hours have your engines done and do you have any noticeable vibrations when running at cruise?

There are many manufacturers of mechanical seals out there who can build you one to match what you have the tricky bit comes with the Oil seals. CAT use two of them that have/had the number 1H5959 in their lube oil priming pumps.

These have an odd outer dimension and are/were manufactured for CAT by Chicago Rawhide. There was not an alternate oil seal available anywhere when have looked. The same goes for the oil seal in the raw water pumps used on the 3306 Gensets.

That was quoted from the MTU book.
If you are not leaking that bad yet, You may not have a problem as per the factory spec.
I'm still learning.

I missed my contact and I'll find him next week. He is Volvo heavy and I remember him commenting on MTU parts before.

You ,ight be in luck, someone who read this thread sent me this: https://www.marineenergysystems.com...it-Diesel/MTU-2000-Sea-Water-Pump-Spare-Parts.

As crazy as it sounds, those notes are the same in a few MARINE manuals I found talking about that raw pump..
Checkout your user guide. I thought it was a hoot when I first found it.

My ole 2-stroke Detroits don't leak that much overall.

Looks like K1W1 and his support may have found the data you really need.
Outstanding.