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Old 03-08-2013, 16:26   #1
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Engine anodes

My H28 has a Perkins Perama 3 cyl 26hp diesel engine. I have searched all over and around the heat exchanger for an anode and can't find it. Can any one tell me where it is located please, assuming this engine does in fact have a cooling system anode.
Thanks, Chris
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Old 03-08-2013, 16:43   #2
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pirate Re: Engine anodes

It'll be fitted in the engine block along the Raw Water route... look for a square protrusion
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Old 03-08-2013, 18:44   #3
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Re: Engine anodes

O.K., Thanks.
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Old 04-08-2013, 07:13   #4
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Re: Engine anodes

Try the
Perkins Perama Shop Manual ➥ http://motorklubben-columbus.weebly....ama_series.pdf
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Old 05-08-2013, 17:42   #5
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Re: Engine anodes

Well, I've had another fruitless search around the engine and also the engine's workshop manual. I can't find any anodes and the manual doesn't mention them. There are similar questions on other sites as to the absence of anodes on Perkins Perama engines, so I assume that this engine does not have any??
I am not particularly pleased about that.
I am thinking about drilling and tapping into the water jacket and installing one of those little pencil thick anodes that are set into a threaded brass plug. Alternatively, could I not just drop a small anode into the water jacket via the water filler cap? Or, do I assume that since the engine does not have an anode factory fitted, it doesn't need one?
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Old 06-08-2013, 02:42   #6
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Re: Engine anodes

If your engine has a heat exchanger it may not have any anodes and since they are not mentioned in the service manual this is most probably the case. You cannot just drop them in because the anode has to have a good electrical connection to the metal you are trying to protect.

Modern engines tend to have alloy parts exposed to the cooling fluid and if you run them on just water instead of the recommended cooling fluid you could have serious electrolytic corrosion problems in that the alloy parts will act as an anode to protect any other exposed metal parts particularly cast iron or steel engine blocks.

Many of the marine conversions now prevalent have the heat exchanger incorporated into the water cooled exhaust manifold and these are cast from alloy and are particularly prone to corrosion if you don't run the correct cooling fluid in the engine side of the circuit.

It is probably more important to use the correct cooling fluid than to install an anode although I tend to like anodes and have lots of them on my engine.
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Old 06-08-2013, 14:03   #7
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Re: Engine anodes

Thanks for your reply.
Prior to my taking over the vessel, the paperwork that came with her indicates that the engine had been professionally maintained. I note that the fresh water in the heat exchanger is a bright green which would indicate that some sort of additive is in it. I think that I will drain the system, flush, and refill with the manufacturers recommended fluid, and also tap into the water jacket somewhere and install a threaded anode.
Nothing quite beats a belt and braces approach.
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