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Old 09-05-2012, 12:02 PM   #1
sacto67
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What is this on my I6 250?
What is this and what is it for? 68 inline 250......driver's side
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Old 09-05-2012, 12:06 PM   #2
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Re: What is this on my I6 250?
looks like a broken sending unit. Probably water temp
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Old 09-05-2012, 03:49 PM   #3
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Re: What is this on my I6 250?
That is a broken water temp sending unit just like the previous poster said.

Those 68 chevy stepsides with the I6 must have been popular with the government. I've got a parts 68 that says Dept of Interior.
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Old 09-05-2012, 03:57 PM   #4
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Re: What is this on my I6 250?
Cool, thanks for the replies.
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Old 09-05-2012, 04:22 PM   #5
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Re: What is this on my I6 250?
If it's not leaking it's not broke!
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Old 09-05-2012, 08:58 PM   #6
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Re: What is this on my I6 250?
Quote:
Originally Posted by Daner View Post
Those 68 chevy stepsides with the I6 must have been popular with the government. I've got a parts 68 that says Dept of Interior.
I had a '67 that had this on the glovebox door:



Hard to read in the picture, but it has all the pertainate info.
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Old 09-05-2012, 09:43 PM   #7
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Re: What is this on my I6 250?
Mine still has that plate on the glove box also
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Old 09-06-2012, 04:22 PM   #8
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Re: What is this on my I6 250?
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If it's not leaking it's not broke!
I'd say that one is broke. The complete electrical parts are broken off.
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Old 09-06-2012, 04:55 PM   #9
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Re: What is this on my I6 250?
The bulb with sensing line is gone for sure. The thermowell is there. If it's not leaking it's not a problem. Could put a plug in it I suppose.
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Old 09-06-2012, 05:30 PM   #10
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Re: What is this on my I6 250?
Yeah it's not leaking fluids. I just didn't know what it was for and wasn't sure if it might contribute to the engine not running right. Just a thermostat wouldn't affect that though.
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Old 09-06-2012, 05:36 PM   #11
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Re: What is this on my I6 250?
Quote:
Originally Posted by Daner View Post
Those 68 chevy stepsides with the I6 must have been popular with the government. I've got a parts 68 that says Dept of Interior.
Yes they were. Have a had a few retired Army guys say upon seeing my truck that they drove a lot of them on base back in the day.
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Old 09-06-2012, 05:44 PM   #12
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Re: What is this on my I6 250?
It possibly might have been an emission control senser but most likely it was for a gauge or warning light. It would be a good idea to replce it with the corresponding sending unit. There should be a green wire around there that hooks to it.
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Old 09-06-2012, 05:58 PM   #13
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Re: What is this on my I6 250?
Quote:
Originally Posted by Wrenchbender Ret View Post
It possibly might have been an emission control senser but most likely it was for a gauge or warning light. It would be a good idea to replce it with the corresponding sending unit. There should be a green wire around there that hooks to it.
Remember, this is a '68 truck. Emission control sensors hadn't been invented yet
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Old 09-06-2012, 09:10 PM   #14
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Re: What is this on my I6 250?
68 was the first year they vented the crankcase to the air filter. I think thats all they had as far as emission control goes. Yes green wire should come around from the passenger side of the engine. It has kinda an interesting connector on it too.

Sorry for starting the gov truck tangent.
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Old 09-07-2012, 10:55 PM   #15
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Re: What is this on my I6 250?
Yep. it WAS a sending unit. I have seen these boken off and a new one installed in the thermostat housing! Look for where the green wire is going to, make sure it is connected to a working sending unit. I love those 250 I6's.
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Old 09-08-2012, 07:32 PM   #16
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Re: What is this on my I6 250?
Do we see the lines for the A.I.R smog set-up in your pic?
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Old 09-08-2012, 08:03 PM   #17
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Re: What is this on my I6 250?
Yup
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Old 09-08-2012, 08:17 PM   #18
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Re: What is this on my I6 250?
Does it still work?
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Old 09-08-2012, 08:30 PM   #19
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Re: What is this on my I6 250?
I don't know, it's never had a belt on it since I've had it.
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