WD 45 Bypass hose

Ted in NE-OH · Aug 9, 2015

My WD 45 has a bypass hose coming out of the top of the water pump but my WD does not have this hose. What is its purpose?

blue water massey · Aug 10, 2015

where does it go too
my 1955 45 doesn't have one but it does have a plug on it same as my 1953 WD
but my 1950 doesn't
my IT shop manual shows 3 pics of water pumps of which only the one with ball bearings used on lade WD's & WD45's has the plug in it but mention of what it's for

Bob Bancroft · Aug 10, 2015

The bypass allows coolant to circulate back into the engine, prior to the thermostat opening, allowing for a more uniform warm up. At least that's what I've read. Can't prove it by me! I suppose it would eliminate hot spots? I never experienced any problem on the WD without the bypass.

I know on the E Gleaner, with the same basic engine, it made for a handy place to plumb in the heater.

Ted in NE-OH · Aug 10, 2015

Thanks for the info.

WD 45 Bypass hose

Ted in NE-OH

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blue water massey

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Bob Bancroft

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Ted in NE-OH

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