For my '90 stroker build, I want to swap in HO head and have it work with the Renix controls. I found a good deal on a 0630 head, but my understanding is that it is missing a port for the temp coolant sensor. Is it possible to tap my own temp sensor port, or am I better off waiting and looking for a 7120 head? Thanks!
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Tapping 0630 head for renix temp sensor?
- Thread starter obaa-xj
- Start date
Tacedaddy
NAXJA Forum User
- Location
- Shenandoah valley
the newer engines had a sensor bung on the T-stat housing... you could just relocate the sensor to that location (might take a couple adapters from the hardware store)
- Location
- WA state
Use the newer t-state housing (already threaded), extend the existing one wire plug and install the sender in t-stat housing.
5-90
NAXJA Forum User
- Location
- Hammerspace
Look for a dressed flat spot in the same area - I think the 0630 head has that.
Drill and tap 1/8"NPT.
Problem solved.
Yes, the later t-stat housing is D&T 3/8"NPT, but the advantage to having it at the rear of the head is that you're reading from about the hottest point in the cooling system, so you'll catch overheats more quickly. Besides, I don't know offhand if the RENIX temperature sensor that drives the gage follows the standard GM thermistor curve (it would be logical that it does, but I haven't yet confirmed this. Haven't had to so far...)
Thanks for the advice. I've had bad luck splicing harnesses before, so I'd rather tap a new port and re-use the known good working harness than to hack it up.
I don't have my hands on the head yet, but is it safe to say that I either look for the for the mounting boss on the head, or find the corresponding spot based on my stock '90 head, and then simply carefully drill through until I reach a water jacket and tap to 1/8" NPT?
I don't have my hands on the head yet, but is it safe to say that I either look for the for the mounting boss on the head, or find the corresponding spot based on my stock '90 head, and then simply carefully drill through until I reach a water jacket and tap to 1/8" NPT?
hubs97xj
NAXJA Forum User
- Location
- Fort Wayne, IN
http://www.naxja.org/forum/showpost.php?p=245092263&postcount=9
That's the "hacking" that is required- cutting one wire, and adding enough wire to reach the T-stat housing. One cut, two splices.
That's the "hacking" that is required- cutting one wire, and adding enough wire to reach the T-stat housing. One cut, two splices.
Tacedaddy
NAXJA Forum User
- Location
- Shenandoah valley
^ this
Instead of using this
USe these
Instead of using this
USe these
5-90
NAXJA Forum User
- Location
- Hammerspace
Essentially. I think a number of #0630 heads had the boss in place and ground - it's just hit-or-miss on whether it's been drilled & tapped.
Bear in mind that standard pipe threads are tapered, so back the tap out and check your threads at relatively frequent intervals. It's entirely possible to tap too far, and you'll end up either not being able to torque the threads to seal them, or not having the threads mesh at all in the first place!
When installing the sensor, PTFE paste is not indicated - the sensor is self-grounding, and I've noted that PTFE will interfere with that. Use RTV copper, it's got actual copper in and self-grounding sensors (in my experience) still work with this stuff on the threads.
Or, use never-seez (which typically has a metal base,) and tighten to two flats past finger tight. Check for leaks after a day's service or so, and tighten one additional flat if need be.
Why? If you've heard anywhere near as many stories of this thing breaking when removal is attempted, you wouldn't ask...