Bypass valve operation - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 12 (permalink) Old 11-30-2009, 01:15 AM Thread Starter
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Bypass valve operation

Can someone explain the operation of the bypass valve on the 5R100 transmissions? What parameters cause it to open or close and what are the ranges? Is it strickly ambient temp or trans temp that controls the valve? Reason I asked is today I drove about 80 miles, mostly freeway and a little city and the outside temps were never above 45 degrees. I have a bypass filter system on the truck and the filter never got hot to the touch even though the DashDaq was reading 170ish for the trans temp.

Mark don't beat me up. I know now this truck/tranny, Job 3 build, doesn't need an external filter. I learned about the newer better internal trans filter after I installed the bypass filter and may take this bypass filter off if it's not needed and causing harm.

2008 F-250 Lariat CC 4x4. EPA stock.
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post #2 of 12 (permalink) Old 11-30-2009, 01:19 AM
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Re: Bypass valve operation

The trans has an internal thermostat. I think MK has said it is a 175 thermostat. You won't get much flow to the cooler until you get to that temp.

If only those who knew what they were talking about replied, this thread would still be on page one.
2000 F-250 CC 4x4 PSD Auto
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post #3 of 12 (permalink) Old 11-30-2009, 02:04 PM
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Re: Bypass valve operation

The nominal thermostat temperature is 165F. They vary a bit in either direction. It works on transmission temperature. It should hold the trans at about 165F.

On a cool day with an unloaded truck the cooler lines may never get very warm.
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post #4 of 12 (permalink) Old 11-30-2009, 02:25 PM
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Re: Bypass valve operation

Kind of off topic, but is there a "too cold" transmision temp for operation? My daily driver won't break 140 degrees unloaded even after driving for an hour. Is that too cold for a 4r100?
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post #5 of 12 (permalink) Old 11-30-2009, 03:25 PM
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Re: Bypass valve operation

No, that's not too cold.
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post #6 of 12 (permalink) Old 11-30-2009, 05:22 PM Thread Starter
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Re: Bypass valve operation

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Originally Posted by Mark Kovalsky View Post
The nominal thermostat temperature is 165F. They vary a bit in either direction. It works on transmission temperature. It should hold the trans at about 165F.

On a cool day with an unloaded truck the cooler lines may never get very warm.
Thanks Mark. I'm going to keep a closer eye on the trans gauge now since I didn't think the trans temp stayed at 165 F the whole time - maybe got to 175 F before coming down.

2008 F-250 Lariat CC 4x4. EPA stock.
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post #7 of 12 (permalink) Old 11-30-2009, 05:49 PM
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Re: Bypass valve operation

That's normal. The thermostat is not exact, plus or minus 10 degrees is nothing to worry about.
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post #8 of 12 (permalink) Old 11-30-2009, 10:35 PM
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Re: Bypass valve operation

Ok then, i have a question for you guys. Im looking at an external transmission filter from dieselsite. Would this be a good idea or just a waste of money??

06 F250 Lariat CC SB FX4 6.0, EGR Delete by FCDP , 58v FICM by Quick Tricks, Autometer Gauges (Boost, Pyrometer, Trans. Temp), SCT X3 W/ IDT, 4" TB Straight Pipe, S&B CAI, ZOODAD, Retro-Solutions HID Kit (4300k), CCV Mod, Coolant Filter

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no reason to get butt hurt like someone shoved a lamp up ur butticusrumpus or somthin
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post #9 of 12 (permalink) Old 12-01-2009, 12:23 AM
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Re: Bypass valve operation

You already have an external bypass filter. How is that one better than the one your truck came with?
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post #10 of 12 (permalink) Old 12-01-2009, 12:27 AM
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Re: Bypass valve operation

I didnt know mine already came with an external tranny filter.

06 F250 Lariat CC SB FX4 6.0, EGR Delete by FCDP , 58v FICM by Quick Tricks, Autometer Gauges (Boost, Pyrometer, Trans. Temp), SCT X3 W/ IDT, 4" TB Straight Pipe, S&B CAI, ZOODAD, Retro-Solutions HID Kit (4300k), CCV Mod, Coolant Filter

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no reason to get butt hurt like someone shoved a lamp up ur butticusrumpus or somthin
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