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Replacing the connecting pipe (thermostat to water pump)

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Old 05-22-2008, 10:05 AM   #1
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Default Replacing the connecting pipe (thermostat to water pump)

I smelled a coolant leak, and saw a drip per second coming from the water pump area. I was hoping it was the o-ring on the end of the connecting pipe, but it turned out to be the connecting pipe itself.

the end had rusted away and the oring was actually jammed into the water pump impeller. parts cost about 40$ or so, until I broke the 100$ knock sensor when reinstalling.

This can be done from underneath, remove the oil filter and oil cooler for easier access. Cut off the hoses connected to the pipe to make things easier, pull the pipe out from the thermostat area, then clamp the new hoses onto the pipe before feeding the pipe back under the car. remove the oil pressure and kock sensors if you're smart (unlike me).

replacing part nos. 13, 22, 23


take off intake, thermostat, to expose one end of the pipe.


unbolt the pipe and cut off heater hose and oil cooler hose if replacing them(makes it easier to pull, might as well replace all hoses)
pull the connecting pipe out of the water pump
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o-ring in the pump:
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old pipe vs. new pipe


don't break a 100$ sensor while installing a 40$ part.
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Modified by Jagan'92 at 2:50 PM 5/22/2008
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Old 07-11-2008, 08:52 AM   #2
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Default Re: Replacing the connecting pipe (Jagan'92)

Thanks!
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Old 06-29-2009, 04:45 PM   #3
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Default Re: Replacing the connecting pipe (thermostat to water pump)

Where can I get these parts I am having the same problem on my 87 Accord, and the pipe is all rusted out like yours. I can't find them anywhere. Please help.

Thanks,
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Old 06-30-2009, 04:01 AM   #4
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Default Re: Replacing the connecting pipe (thermostat to water pump)

Nice write up. Thanks.
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Old 06-30-2009, 09:13 AM   #5
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Default Re: Replacing the connecting pipe (thermostat to water pump)

knock sensors are not $100....any OBD 1 knock will work. you can find them used from $40-60 all day
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Old 06-30-2009, 12:19 PM   #6
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Default Re: Replacing the connecting pipe (thermostat to water pump)

Thats not rust thats acid. Hence the need for regular coolant flushes with the proper mixture and coolant.
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Old 07-21-2009, 03:19 PM   #7
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Default Re: Replacing the connecting pipe (thermostat to water pump)

Hi, Where can I find this water pipe for my accord SEi from 89?
Thank you.
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Old 08-14-2009, 01:05 PM   #8
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Default Re: Replacing the connecting pipe (thermostat to water pump)

hi i was reading your answer on replacing the connecting pipe from the thermostat to water pump. i am currently doing this on a 92 accord and attempting to install my new connecting pipe but am having trouble keep the o rings in place( they keep falling of into the water pump) and am also un able to to remove the the hose that runs from the fire wall to the connecting pipe. any help is greatly appreciated

thanks jim
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Old 10-06-2009, 03:03 PM   #9
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Default Re: Replacing the connecting pipe (thermostat to water pump)

anyone know how to put these things back in to the waterpump?
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Old 10-07-2009, 09:53 AM   #10
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Default Re: Replacing the connecting pipe (thermostat to water pump)

Quote:
Originally Posted by Jagan'92 View Post
I smelled a coolant leak, and saw a drip per second coming from the water pump area. I was hoping it was the o-ring on the end of the connecting pipe, but it turned out to be the connecting pipe itself.

the end had rusted away and the oring was actually jammed into the water pump impeller. parts cost about 40$ or so, until I broke the 100$ knock sensor when reinstalling.

This can be done from underneath, remove the oil filter and oil cooler for easier access. Cut off the hoses connected to the pipe to make things easier, pull the pipe out from the thermostat area, then clamp the new hoses onto the pipe before feeding the pipe back under the car. remove the oil pressure and kock sensors if you're smart (unlike me).

replacing part nos. 13, 22, 23


take off intake, thermostat, to expose one end of the pipe.


unbolt the pipe and cut off heater hose and oil cooler hose if replacing them(makes it easier to pull, might as well replace all hoses)
pull the connecting pipe out of the water pump


o-ring in the pump:


old pipe vs. new pipe


don't break a 100$ sensor while installing a 40$ part.



Modified by Jagan'92 at 2:50 PM 5/22/2008
the pipe is only 40.00?
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Old 10-08-2009, 07:16 AM   #11
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Default Re: Replacing the connecting pipe (thermostat to water pump)

yeah. do you know how its held into the waterpump? is it just jammed in there and bolted down?
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Old 10-08-2009, 08:23 AM   #12
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Default Re: Replacing the connecting pipe (thermostat to water pump)

Yeah you wiggle it in there, If the motor is off its easy if motor is on have fun.
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Old 10-08-2009, 03:24 PM   #13
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Default Re: Replacing the connecting pipe (thermostat to water pump)

There is a 10mm bolt a couple of inches down the water pipe that holds it in place, but as ^ said, its basically jammed in there...
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Old 02-16-2010, 05:49 AM   #14
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Default Re: Replacing the connecting pipe (thermostat to water pump)

BTW, great post man! Anyway, i need to know where you bought that water pipe cuz i cant find it anywhere for some reason. I been searching everywhere online. A part # would help if you still have it?

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Old 05-05-2010, 12:47 PM   #15
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Default Re: Replacing the connecting pipe (thermostat to water pump)

There is a 10mm bolt a couple of inches down the water pipe that holds it in place, but as ^ said, its basically jammed in there...[/QUOTE]


I could not reach that bolt so I wiggled the pipe back and forth until the bracket broke off. I only pulled the pipe out far enough to replace the o-ring on the water pump side. Only disconnected the heater hose.

Since I don't want to ever get back in the area, before I put on the new o-rings I smeared some RTV sealant on the pipe, then put on the o-rings. Before jamming the pipe on the water pump side I also added a ring of the RTV in the housing then slid the pipe until it stopped. The sealant oozed out perfectly.

On the other end I also smeared some RTV on the thermostat housing. The pipe is wedged between the water pump and the thermostat once everything is in place so that bracket is not needed. Cooling system has been operating flawlessly since. 92 Honda Accord.
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Old 12-04-2010, 10:34 PM   #16
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Default Re: Replacing the connecting pipe (thermostat to water pump)

Hi, eveyone. I break the thermostat housing case when I tried to lock up the bleeder... So i have to install a new thermostat housing case for my h22a. (Anyone knows the part # for h22a?) My main question is how to disconnet and reinstall the water pipe to the thermostat housing? I didnt see any clamps there. Just simply push it out and jammed it back by hands?
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Old 12-05-2010, 08:03 AM   #17
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Default Re: Replacing the connecting pipe (thermostat to water pump)

i'm pretty sure all the h22 water pipes are the same. And yes it just goes into the thermostat housing. Work/wiggle it into place. Just make sure you have it in far enough.
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Old 12-05-2010, 08:39 AM   #18
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Default Re: Replacing the connecting pipe (thermostat to water pump)

There is 1 bolt though near the center, but other than that it is just held in by being pressed between the thermostat housing and water pump.
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Old 12-05-2010, 08:57 PM   #19
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Default Re: Replacing the connecting pipe (thermostat to water pump)

Thanks all.
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Old 01-20-2011, 08:56 PM   #20
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Default Re: Replacing the connecting pipe (thermostat to water pump)

Is it some what the same thing to change the water pipe on a d series?
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Old 01-21-2011, 08:52 AM   #21
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Default Re: Replacing the connecting pipe (thermostat to water pump)

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Originally Posted by hifonics View Post
Is it some what the same thing to change the water pipe on a d series?
Similar.
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Old 01-21-2011, 02:19 PM   #22
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Default Re: Replacing the connecting pipe (thermostat to water pump)

I just did mine right now,hardest part is pulling the pipe out but i had to cut the hose that connects to the pipe on the thermostat side.Does anyone know what that hose is called so i can go pick one up?
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Old 01-19-2012, 10:23 PM   #23
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Default Re: Replacing the connecting pipe (thermostat to water pump)

Hey i need your help please! im desperate to find the water pipe to my 97 honda prelude! i cant find it absolutely anywhere! nobody has it! some places dont even know what i am talking about! its the pipe that connects the water pump and the thermostat housing. i have a leak from there and it makes my car overheat after a while. i found the spot where its leaking from and i showed my auto tech teacher and it is from the pipe. so can you please help me and tell me where i can get the pipe at? i really need it! and soon! please ill appreciate it a lot!thanks!
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Old 01-20-2012, 04:18 AM   #24
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Default Re: Replacing the connecting pipe (thermostat to water pump)

Quote:
Originally Posted by GeoPrelude View Post
Hey i need your help please! im desperate to find the water pipe to my 97 honda prelude! i cant find it absolutely anywhere! nobody has it! some places dont even know what i am talking about! its the pipe that connects the water pump and the thermostat housing. i have a leak from there and it makes my car overheat after a while. i found the spot where its leaking from and i showed my auto tech teacher and it is from the pipe. so can you please help me and tell me where i can get the pipe at? i really need it! and soon! please ill appreciate it a lot!thanks!
Honda Dealership, Majestic Honda (honda parts website), junkyard. it's not that hard to find the coolant connecting pipe.

http://www.hondaautomotiveparts.com/...+PUMP+-+SENSOR #11
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Old 04-21-2014, 12:28 PM   #25
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Default Re: Replacing the connecting pipe (thermostat to water pump)

thanks for the write up helped alot.
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2005, 92, civic, connecting, honda, intake, integra, leak, pipe, pipes, replace, replacing, rusted, thermostat, thrmostat, water

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