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Thermostat jiggle valve 4.0l OHV

JMF661

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Ford Ranger XLT
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Hello All,

I’m doing an intake manifold gasket replacement on this 4.0l OHV 93 ranger. I’ve ordered a mahle intake gasket set. Anyway, the stat thermostat I’ve ordered doesn’t have a built in jiggle valve like the installed stat valve. Should I drill a small hole in my new one, or attempt to shop for a new thermostat with the proper configuration?
Thanks!
 

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Dirtman

Former Middleweight Moss Fighting Champion
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It's up there.
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It's not that big of a deal either way. It's just to help purge air from the system but many cars dont have it. If it bothers you, drilling a single 1/8" hole will be perfectly safe and effective.
 

19Walt93

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If you don't have time to do it right will you have time to do it over?
I drill a 1/16 hole in every thermostat that doesn't have a vent and install it at the top to purge air. It doesn't hurt anything and might help. I've seen engine with a port to bleed the air when filling the cooling system, Renault Lecar's and 4 cylinder 80's Taurus' come to mind. It prevents the coolant from puking out the first time the stat opens. This will be the final time you see me say something positive about a Renault.
 

JMF661

Active Member
Joined
Feb 6, 2020
Messages
325
Reaction score
120
Points
43
Location
Montana
Vehicle Year
1994
Make / Model
Ford Ranger XLT
Engine Type
4.0 V6
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
Stock
Tire Size
31” x 10.5”
Good info, thanks guys. I’m going to go ahead a drill that hole and orientate it to the top of the port.
 

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