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engine thermostat bypass

July 22, 2022, 06:39:24 pm

I am changing the hose that is between the water pump and the thermostat housing.

there is a washer with a hole in the middle.

what is its purpose.

does it supposed to be there

thank you

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Re: engine thermostat bypass

Reply #1 – July 22, 2022, 06:46:42 pm

Yes, you need to put that washer back. It's purpose is to restrict water flow in the system. I think it helps to bring the water temp up faster.
 

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Re: engine thermostat bypass

Reply #2 – July 22, 2022, 07:05:42 pm

ok but then how do you cool it down.?

on my last long trip it took longer to bring  the temp down

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Re: engine thermostat bypass

Reply #3 – July 22, 2022, 08:08:06 pm

That washer is there for the retarder cooler to operate properly put it back where you found it.

Mike

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Re: engine thermostat bypass

Reply #4 – July 22, 2022, 08:14:58 pm

Here is a link to an old thread that has some info out of the Cummins book.
Still running hot
Mike

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