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Old 11-05-2015, 09:00 PM
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5/8" heater hose on 3/4" water pump - is there a fix?

I have a '96 with a factory heater. The return hose goes to the water pump. The hose is a 5/8" ID going on a 3/4" fitting. It has been put on there for years and is pretty stretched out. I just replaced the water pump with a '96 corvette water pump and relocated the hot water source to the car location which is opposite side of the temperature sensor. This fitting is also 3/4". The hose does not want to go over it. I am kind of tired of fighting the hose every fall during winterization. I was looking for brass 5/8" barb to 3/4" barb but I can't find one.

Anyone come find one or maybe find a better solution?
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Old 11-05-2015, 10:19 PM
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Get a 1/2" threaded coupling, a 5/8" hose to 1/2" thread adapter, and a 3/4" hose to 1/2" thread adapter.
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Old 11-05-2015, 10:27 PM
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is the fitting a threaded fitting or a cast fitting in the pump body? If threaded, swap it for the proper barb size.
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Old 11-05-2015, 11:08 PM
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I took a little of the rubber out of the hose when I did mine. I think I used a drill or something crude like that, but I took a little rubber out, lubed it up and slid it over.
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Old 11-05-2015, 11:50 PM
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Both fittings are pressed in.

I removed some of the outside rubber off on the large one before. Was just kind of tired of fighting with it and wondered if anyone had a better solution. It has to be taken off every fall for winterization.
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Old 11-06-2015, 05:56 AM
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Quote:
Originally Posted by jakethebt View Post
I have a '96 with a factory heater. The return hose goes to the water pump. The hose is a 5/8" ID going on a 3/4" fitting. It has been put on there for years and is pretty stretched out. I just replaced the water pump with a '96 corvette water pump and relocated the hot water source to the car location which is opposite side of the temperature sensor. This fitting is also 3/4". The hose does not want to go over it. I am kind of tired of fighting the hose every fall during winterization. I was looking for brass 5/8" barb to 3/4" barb but I can't find one.

Anyone come find one or maybe find a better solution?
Why not add a coupler with 3.4" on the pump side and 5/8" on the heater side? Then, you don't have to fight anything when you winterize.
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Old 11-06-2015, 07:52 AM
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I can't find them in brass. It is a reducer with hose bards on each end and due to the temps I need brass. I have not been able to find one.
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Old 11-06-2015, 09:17 AM
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Try this?
http://www.suremarineservice.com/FIT-039.aspx
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Old 11-06-2015, 11:16 AM
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Quote:
Originally Posted by jakethebt View Post
I can't find them in brass. It is a reducer with hose bards on each end and due to the temps I need brass. I have not been able to find one.
Why do you need brass? If the thermostat is operating properly, it shouldn't exceed 180, max. It takes a lot more than that to soften ABS, Teflon, HDPE and many other plastics.

Or, you could use one of these-

http://www.napaonline.com/Catalog/Ca...532_0421631432
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Old 11-11-2015, 07:57 PM
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Thanks for the help. I picked up two of those at Napa and a foot of 3/4" gates heater hose. It works great. I will post up a few picks soon. The upper house extension worked well at about two inches. The lower hose I went about 5" long. That put the hose clamps a bit farther away from the other thermostat hoses.
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