The Forward Look Network
The Forward Look Network
Search | Statistics | User Listing Forums | Chat | eBay | Calendars | Albums | Skins | Language
You are logged in as a guest. ( logon | register )

what does the water pump bypass hose do?
Jump to page : 1
Now viewing page 1 [50 messages per page]		View previous thread :: View next thread
   Forward Look Technical Discussions -> Heating, Cooling and Air ConditioningMessage format
 
udoittwo
Posted 2024-12-10 4:36 PM (#638173)
Subject: what does the water pump bypass hose do?


Expert

Posts: 1368
10001001001002525
Location: Valley Forge, Pa.		I replaced the water pump and the new pump had the wrong size threaded opening for the bypass fitting[3/4" threaded opening] so I plugged the hose & water pump and drove to get an adapter for the 1/2" nipple[3/4 x 1/2 bushing].
The car heated up in a 1/3 the time it normally took and I had heat by 2 miles as compared to several miles with the hose installed.
The temp shot up to hot and I guess when the thermostat opened, it dropped back down. To me, that seems like what a car should do anyway?
I don't understand what it does or is supposed to do?
Top of the page Bottom of the page
56D500boy
Posted 2024-12-10 7:16 PM (#638175 - in reply to #638173)
Subject: RE: what does the water pump bypass hose do?



Exner Expert 10K+

Posts: 10652
500050005001002525
Location: Lower Mainland BC		.
????

I might be missing something but as far as I know there is no water pump bypass hose.

However, there are two small diameter hoses that go to/from the heater core with flow in them controlled
by the heater valve.

A 56 Dodge V8 water manifold and water pump showing the two heater hoses.

If your's is different, I apologize.



Close up of the two heater hoses at the location of the thermostat housing on the water manifold:



A better photo of the heater hoses at the thermostat housing



Heater hoses at the heater core and heater valve:





Edited by 56D500boy 2024-12-10 7:18 PM
Top of the page Bottom of the page
58coupe
Posted 2024-12-11 12:31 PM (#638182 - in reply to #638173)
Subject: Re: what does the water pump bypass hose do?



Expert

Posts: 1770
10005001001002525
Location: Alaska		I believe the main reasons for the bypass are so the pump doesn't cavitate and the water can circulate through the engine before the thermostat opens,so you don't have hot spots. you didn't mention which engine but probably referring to the 277-318 poly.
Top of the page Bottom of the page
57chizler
Posted 2024-12-11 1:10 PM (#638183 - in reply to #638182)
Subject: Re: what does the water pump bypass hose do?



Expert

Posts: 3835
2000100050010010010025
Location: NorCal
58coupe - 2024-12-11 9:31 AM

I believe the main reasons for the bypass are so the pump doesn't cavitate and the water can circulate through the engine before the thermostat opens,so you don't have hot spots.


Correct. On engines without an external bypass hose, a small hole below the thermostat is the bypass. The external hose is usually found when the thermostat is in the intake manifold...not the block or pump housing.
Top of the page Bottom of the page
mikes2nd
Posted 2024-12-11 1:34 PM (#638184 - in reply to #638173)
Subject: Re: what does the water pump bypass hose do?


Expert 5K+

Posts: 5154
50001002525
yeah it just allows water to move a little at least...instead of being completely stopped
Top of the page Bottom of the page
56D500boy
Posted 2024-12-11 5:47 PM (#638187 - in reply to #638183)
Subject: Re: what does the water pump bypass hose do?



Exner Expert 10K+

Posts: 10652
500050005001002525
Location: Lower Mainland BC
57chizler - 2024-12-11 10:10 AM

58coupe - 2024-12-11 9:31 AM
On engines without an external bypass hose, a small hole below the thermostat is the bypass. The external hose is usually found when the thermostat is in the intake manifold...not the block or pump housing.


Sounds like a Plymouth V8 issue more than a Dodge issue.

I think my non-bypass 56 Dodge water pump, which has the thermostat in the water manifold, uses a thermostat with a tiny hole in the plate.

I learn something new every day.

Top of the page Bottom of the page
udoittwo
Posted 2024-12-12 8:27 AM (#638191 - in reply to #638173)
Subject: RE: what does the water pump bypass hose do?


Expert

Posts: 1368
10001001001002525
Location: Valley Forge, Pa.		Alright, that make sense.
I don't recall any bypass hoses like that on any other makes I've owned. Usually 1 hose off the pump to the heater an the heater returned to the intake.
Hopefully it's not something that will damage the motor. I need to drive 10 miles to HOME DEPOT and back for a fitting. No other vehicle.
It heats up right away. Almost to the top and then opening it drops down to almost 3/4. Little hotter at intersections and lower on the highway.
A little warmer than usual but I guess the thermostat on it's own doesn't provide the best flow on it's own?
Top of the page Bottom of the page
Shep
Posted 2024-12-14 2:23 PM (#638217 - in reply to #638191)
Subject: Re: what does the water pump bypass hose do?



Expert

Posts: 3470
200010001001001001002525
Location: Chestertown, NY ( near Lake George)		My friends 59 Dodge 326 has a bypass hose , water pump to below the t'stat.
Top of the page Bottom of the page
Jump to page : 1
Now viewing page 1 [50 messages per page]
Jump to forum :
Search this forum
Printer friendly version
E-mail a link to this thread

* * * This site contains affiliate links for which we may be compensated * * *


(Delete all cookies set by this site)