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Why did they add the bypass hose on the WD-45?
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garden_guy View Drop Down
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Joined: 05 Jul 2013
Location: Illinois
Points: 1163 		Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Topic: Why did they add the bypass hose on the WD-45?
    Posted: 08 Nov 2019 at 9:14pm
How come at some point between the WD and the WD-45, they added a small bypass hose from the thermostat housing to the top of the water pump?

I have a '53 WD (curved shifter model but still a WD) and it has the older style without this bypass hose. When did it get added and why?
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Points: 22285 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 2019 at 9:38pm
Bypass hose was to allow more even warm-up of a cold engine, as it kept the water moving around thru the block and cylinder head until the thermostat opened. While the late WD's had the tall cylinder head and the newer thermostat housing, it doesn't appear the bypass hose was ever factory installed on any WD, only the WD-45's.
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Points: 1163 		Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Posted: 09 Nov 2019 at 10:32am
Makes sense. Thanks for the info!
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