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By HotrodRebel - 13 Years Ago
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Well my 239 in my 54 finally died this past monday. I put a 61 292 from a F100 into it. Didn't have too many problems getting it in. Had to switch a few things around. But its in there and starts and run. I have a issue with my water temp gauge. In the 239 I had a 3/8 npt opening for the mechanical water temp gauge. In the 292 its only a 1/4 npt opening. Is there an after market temp gauge that I can get that will fit in there or is there somewhere else on the block that I can hook the temp sending unit into? Any help will help. Thanks.
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By oldcarmark - 13 Years Ago
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Drill and tap the intake back from the stat housing.Should give a pretty accurate reading.
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By HotrodRebel - 13 Years Ago
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Yea I would have done that when the block was out of the car. But its already in there. That will be my last option if I can't find anything else that will work.
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By GREENBIRD56 - 13 Years Ago
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Which hole was the temp probe in? Usually the first water jacket plug back of the intake on the driver's side cylinder head. You'll see a matching "blind" plug on the passenger side just ahead of the distributor. The jacket hole typically has an insert pressed in there to provide the tapped hole - it isn't threaded into the block. There are pullers made that will pull it out - but you could just make your own version. Like stick a bolt (threads out) in a short nipple. Once you have a clean hole - make a new insert......lots of handy work - but you'll get it pretty quick I'd say. nothing as hard as the motor swap.... the T-bird parts houses actually sell the insert - but i can't tell you which one is the right pipe thread - they are different between the 55/56 and the 57 - but one of them is 3/8 pipe I'll bet.
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By Daniel Jessup - 13 Years Ago
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Usually a Sunpro or Autometer mechanical temp gauge works just fine. I am pretty sure that they come with a variety of fittings for different npt sizes. I know this will be an aftermarket fix for you, but the ones I have purchased in the past have been pretty accurate....
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By paul2748 - 13 Years Ago
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If I remember correctly, The 55/56 is the correct bung/insert for the head. In 57 they went to the smaller size. If you order one from any of the TBird stores, as them to measure it before buying.
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By MoonShadow - 13 Years Ago
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Try your hardware store for an adapter. Also look around the front of the intake there is often a plugged hole there. Is the small hole you are talking about in the drivers side cylinder head at the rear? Some of them have a down adapter installed from the factory. Chuck
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By bergmanj - 13 Years Ago
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Why not just use a brass 3/8 to 1/4 bushing? Some hardwre stores carry them. I would install it in with red ("permanent") Locktite, then grind-off the outside flush with the existing head bushing. Just a thought. Regards, JLB
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By GREENBIRD56 - 13 Years Ago
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I believe this link will take you to a page where you can see one...... Concours calls it a "TEMPERATURE SENDER ADAPTER BUSHING"- p/n 10911-AR - $15.25 Also a handy tool to look at - the Temperature Sender Remover http://www.concoursparts.com/ There is probably one of the right size stuck in the old head......they are press-in rings with pipe threads to match the sender.
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By Hoosier Hurricane - 13 Years Ago
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JLB: A bushing is backwards from what he needs. He has the large (3/8 npt) sender and the small (1/4 npt) hole. It is possible to drill and tap the bushing in the head while the engine is in the car, but requires some effort.
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By The Master Cylinder - 13 Years Ago
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Hoosier Hurricane (7/3/2012)
JLB:
A bushing is backwards from what he needs. He has the large (3/8 npt) sender and the small (1/4 npt) hole. It is possible to drill and tap the bushing in the head while the engine is in the car, but requires some effort.
Haha, I tried that once, more trouble than it's worth because it is hard to get to. Much easier to but tool and correct bushing.
GREENBIRD56 (7/3/2012)
I believe this link will take you to a page where you can see one...... Concours calls it a "TEMPERATURE SENDER ADAPTER BUSHING"- p/n 10911-AR- $15.25 Also a handy tool to look at - the Temperature Sender Remover http://www.concoursparts.com/There is probably one of the right size stuck in the old head......they are press-in rings with pipe threads to match the sender.
I actually have installed bushings in both of my heads, one for the gauge and one for the thermal switch for my electric fan.
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By MoonShadow - 13 Years Ago
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The bushing in the head could be removed. Check this tool on CASCO. http://www.parts123.com/parts123/yb.dll?parta~partsort~A2~cadeheka They also have the 56 sending unit. Chuck
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By bergmanj - 13 Years Ago
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Hoosier, OP print must have been too small -- OOPS! Regards, JLB
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By GREENBIRD56 - 13 Years Ago
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This is the animal............ 
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By HotrodRebel - 13 Years Ago
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I went to the hardware store today and got a brass 1/4 npt male to a 3/8 npt female. Only set me back a few bucks and worked out perfectly. Just gotta set the timing tomorrow and the old girl will be back on the road again.
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By The Master Cylinder - 13 Years Ago
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Just a thought, If the bulb of the temperature sending unit is not in the coolant you will not get the correct reading. If by using your fitting it raised the sending unit out of the water and created an air bubble around it... just saying.
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By Richard - 13 Years Ago
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I have a similar problem 57 312 in a 54. I do see a location near the distributor and the temp sender does fit, but is tight for the distributor ( mallory dual point ) I may be able to buy a curved pipe from the hard ware store.
I thought about the 4 barrel manifold at the back has the same pipe thread as the sensor..
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By Hoosier Hurricane - 13 Years Ago
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The pipe thread at the back of the manifold is a vacuum source, not hot water. Also, I wonder if the '54 bulb will fit inside a 1/4" fitting such as your reducer. My opinion is that you will either have to tap the old original bushing or install a new one.
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By Richard - 13 Years Ago
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Looks like the sender on my application will go into the passenger side head at the rear. Seems to fit all be it a little tight.
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By alanfreeman - 13 Years Ago
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Yes John, you are correct. I drilled and tapped the temp. sender bushing on the 1961 292 that I put in my '54 Mercury so I could use the stock 6 volt sending unit. I did it with the engine in the car and it worked out fine. Alan S. Freeman
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