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Old 03-05-2021, 09:41   #1
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removing coolant hoses for water heater

my boat has a Perkins 4.236, and came with a long loop of coolant hoses that i assume used to be connected to a water heater. i'd like to remove these, as i do not plan on having a water heater connected like that, and one of the hoses has sprung a leak.

question: when i remove the coolant hoses that went to the water heater, do i need to install a new (much shorter) loop of hose in their place, or do i just plug the two holes? is there anything else i need to do?

Other engines i've seen appear to just have plugs in those holes, but i'm confused about how that would not interrupt the flow of coolant through the engine.

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Old 05-05-2021, 13:37   #2
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Re: removing coolant hoses for water heater

I took a look at the service manual. It's here if you want it:

I could not find an exploded view that would answer the question.

It occurs to me that a simple test would answer the question. Start the engine, establish water flow, and then clamp the hose to the water heater. If the hose pops off, spraying you and the engine compartment with harbor mud and landing half a squid on the admiral's knitting table, you need a loop and a new place to spend the night. If all continues as is, you're fine - plug them. On my DD 4-53, the hoses for the water heater are not in series with the entire flow, so plugging would work. Whether that is convention, I really don't know.
Never let anything mechanical know that you are in a hurry.
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Old 05-05-2021, 14:00   #3
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Re: removing coolant hoses for water heater

Forget about "other engines." The ONLY one you need to know about is the one in your boat. I always (kid) about people taking diesel classes on Yanmars when they have Universals in their boats.

I could tell you what happens on my engine and water heater. It won't help you but yes I need to connect the two with a shorter hose. I have NO clue what you need to do on your engine, because I don't have one.

BUT, but, but, follow keith's advice and RTFM.

Good luck, whatever happens I know for sure that it will be an easy fix.
Stu Jackson
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Cowichan Bay, BC, (Maple Bay Marina) SR/FK, M25, Rocna 10 (22#) (NZ model)
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coolant, heater, water

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