| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,022 Posts1,055,382 Members48,422 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | 
#69312 11/28/2006 4:41 PM | Joined: Sep 2006 Posts: 42 Junior Member | | Junior Member Joined: Sep 2006 Posts: 42 | I have a 59' 1/2 ton with 235. The original locked up so I'm replacing with another 235 out of a 55'. I'm a total noobie to all of this stuff and having difficulty putting things back together (it came apart so easy  ). ...the truck has the electronic water temp sender but the block (55') has a smaller hole. Was this a mechanical sender? Is there an adaptor to go to the larger 59 style sender? | | |
#69313 11/28/2006 5:28 PM | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | I believe some or all of the 55's did have mechanical temp gauges - you could prolly find a bushing to adapt the electric sender at a plumbing supply place, it's just pipe threaded stuff, but that may not put the sender in a position to act properly ... might also find another spot in that engine to mount the sender
Bill | | |
#69314 11/28/2006 5:50 PM | Joined: Sep 2006 Posts: 42 Junior Member | | Junior Member Joined: Sep 2006 Posts: 42 | Thanks.
What do you mean by finding another spot in the engine? | | |
#69315 11/28/2006 6:55 PM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | tractorboy,
If there were another plug on the head the accessed the water jacket, and it was the same size or larger than your sending unit, it could be used.
My first choice would be to persuade the counterman at your local parts store to research a new sending unit of the same electrical value that had a smaller pipe diameter.
If all avenues came up dead, a close nipple and a bell reducer, or a 'adapter fitting' would allow you to utilize the existing sending unit in the same hole in the head....maybe.
Stuart | | |
#69316 11/28/2006 7:10 PM | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | tractorboy, Your question has been discussed before and you might find it helpful to Search this forum on "sender adapter". Part numbers and advice will be found in a few of the earlier discussions. Tim | | |
#69317 11/28/2006 10:20 PM | Joined: Nov 2000 Posts: 582 Shop Shark | | Shop Shark Joined: Nov 2000 Posts: 582 | Tractorboy; A viable alternative to mounting the electrical sensor on the head is to try to find a thermostat housing that has the larger threaded opening on the side below the thermostat. This is what I have on my 261 with the electrical sensor. Regarding the resistance, most newer sensors you can find at NAPA etal, just don't seem to work with the older gauges. I've tried a ton of inline resistance options for matching my gauge to my sensor but with no luck so far. (The sensor is a negative coefficient type where the resistance rises as the temperature cools and vice versa) Have found a used one which is now on my 261 but haven't started it up since the rebuild to check to see if it reads correctly. If I did this pic right, you can see what I mean. http://rides.webshots.com/photo/2869036240010188466uuTHjC | | |
|
|
| |
