![]() |
|
![]() |
#1 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
well with the new thermostat it was more of the same the truck ran hot, after 30 minutes we were in the red (or what would have been red if the gauge hadn't faded, lol)
|
![]() |
![]() |
![]() |
#2 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
so I peeled off the Magnaflow sticker off the back window my buddy Mike put on to prank me, and that Welders one as well, that one was on there for 40 years and it took me 2 years to finally get rid of it, then I washed that glass, and had a few beers...
ah a clean canvas, that's more like it |
![]() |
![]() |
![]() |
#3 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
then I had a few more beers while Rusty sun bathed
|
![]() |
![]() |
![]() |
#4 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
folks, sometimes you have to walk away from the problem to have that Eureka moment
so I got to thinkin', why does my truck overheat now when it didn't overheat before this project, I mean I know the heads are different, I know the intake manifold is different, but what else hmmm, remember we used to run the heater core and now we don't? Well, we are blocking off the port on the intake manifold and we are blocking off the port on the water pump, what if we STOP blocking them off and run a bypass hose as a happy compromise? and so we did just that Note: we had to run the hose 5 foot high to prevent it from kinking, hey its a temporary solution to test a hypothesis, the zip ties don't hurt either |
![]() |
![]() |
![]() |
#5 | |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
|
Re: Restoring Rusty
Quote:
The threaded hole you plugged directly under the radiator hose on the LH front side of the intake is a good location or you could drill and tap the unthreaded boss next to the heater hose.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
|
![]() |
![]() |
![]() |
#6 | |
Registered User
Join Date: Nov 2013
Location: Antioch, Ca.
Posts: 455
|
Re: Restoring Rusty
Quote:
__________________
Take Care Troy |
|
![]() |
![]() |
![]() |
#7 | |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
Quote:
I plan on getting a forward facing water outlet so that I can install the sending unit on the driver side and clear the upper radiator hose. Not a fan of putting any more holes in that intake. ha ha |
|
![]() |
![]() |
![]() |
#8 | |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
|
Re: Restoring Rusty
Quote:
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
|
![]() |
![]() |
![]() |
#9 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
|
![]() |
![]() |
![]() |
#10 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
now running the bypass hose was harder than I made it sound, first of all the hoses are of two different sizes, the smaller one is 1/2 inch I think the larger is 3/4, which means the nipple fittings are different, the one in the intake manifold is smaller than the one in the water pump which is bigger
so I had to go to the parts house and get another 3/4 aka bigger fitting figure I better run a larger hose than a smaller one but the two fitting sizes were only my first problem Where do I put the water temp sensor if I have to dedicate its current hole/port to the bypass hose fitting? Well aint there another port on the other side of the intake manifold? Why yes there is, it is directly under the upper radiator hose and the sensor won't fit So I considered getting another "Poser" chrome water outlet, one that points straight forward rather than to the driver side, but that would mean getting an upper radiator hose pre bent the same way, etc So I found that the 1972 water outlet has a port right in it for the water sensor, but they were out of stock, ok how about the 1981 water outlet ($7 bucks) it has not one but two ports right in it, AWESOME, we can screw in our water sending unit right into the thermostat housing, how interesting, problem solved Note: Eventually if I get super geeky I will run both the old and the new sending units off of this water outlet and into two separate gauges and stare and compare their readings, should be fun. |
![]() |
![]() |
![]() |
#11 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
well Good News with the heater bypass hose the truck no longer overheats, the gauge sits just barely to the right of center (wish those notches had some numbers like 180*F or 220*F, etc.)
here it is after 10 minutes and again after 30, which would have overheated by then without the bypass hose, I kept driving hard for an hour (twice the normal overheating time ie 30 mins) and no problem the needle did not move after the truck cools I wills see if it needs to be topped off with water as there was some water loss during the bypass hose installation Remember: Key to proper troubleshooting is making one change at a time and one change only, no matter how tempting to do other things. Then reading the results and deciding on whether to make another change, etc. Last edited by Gregski; 05-01-2016 at 11:48 PM. |
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: May 2009
Location: Good Thunder Mn.
Posts: 955
|
Re: Restoring Rusty
Why not put the water temp sending unit in the head? I noticed that the temp sending unit on my 80 4.1 was 3/8 npt.
|
![]() |
![]() |
![]() |
#13 |
Second Chance Program
Join Date: Jun 2006
Location: Portland, OR
Posts: 2,642
|
Re: Restoring Rusty
I dig the new look.
__________________
90 Chevy Suburban 2500 5.3 swap/th400/np241/14bltSF/10blt. 77 C20 crew cab Silverado. 396/th400. In work. |
![]() |
![]() |
![]() |
#14 | |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
|
Re: Restoring Rusty
Quote:
The 3/8" NPT tang senders have a different resistance range than the 1/2" NPT Nail Head senders. You could swap in a matching 1979/1980 or later temp gauge along with the 3/8" NPT tang sender.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
|
![]() |
![]() |
![]() |
#15 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
|
![]() |
![]() |
![]() |
#16 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
New Clue: truck will not idle below 750 RPM, even with the idle speed screw all the way out, timing set at 12* BTDC
|
![]() |
![]() |
![]() |
#17 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
OK, back to basics
went out and bought a Vacuum gauge at NAPA for $25 bucks this should help set the idle mixture screw on the Holley 4160 carb so following a Super Chevy article (love that magazine) we set the idle to 850 RPMs that should give us a stable vacuum reading |
![]() |
![]() |
![]() |
#18 |
Registered User
Join Date: Feb 2012
Location: Beautiful BC, Canada, eh?!
Posts: 2,228
|
Re: Restoring Rusty
That sucks.
(gufaw, gufaw, gufaw, hyuck, hyuck, hyuck)
__________________
1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, boosted-LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate |
![]() |
![]() |
![]() |
#19 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
so we hook the timing light up and the vacuum gauge to a non ported manifold vacuum off the base of the 4160 carb and the needle won't sit still, it jumps spastically between 15 and 20 PSI, see video
we bottom out the idle mixture screws one on each side of this carb (it only has two) and then turn them out 1.5 turns as per Holley's instructions than we play with them screwing them all the way in slowly then backing them out to about 2.5 turns, and that pesky needle keeps dancing and won't stabalize https://www.youtube.com/watch?v=ry9ShldWpUg |
![]() |
![]() |
![]() |
#20 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
so at this point I am thinking vacuum leak, so I disconnect anything that may be sucking vacuum, brake booster, PVC, etc. and plug those ports up with some spare hoses and bolts in them to clog them up, still no change, needle keeps dancing
so I remove the carb and notice I got a 1/4" spacer but it ain't sandwiched between base gaskets, (not sure if it must be, but something tells me it ought to should) so I shoot over to the parts house and buy 3 different types of gaskets (two of each) a 54 a 55 and a 57 hey, who knew? right? |
![]() |
![]() |
![]() |
#21 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
Now Silver-hair was by this time very tired, and he went downstairs to the garage, and there he found three Holley carb gaskets. He tried the largest one, which belonged to the Big Bear, and found it too big; then he tried the middle-sized gasket, which belonged to the Middle-sized Bear, and he found it too small; then he tried the smallest one, which belonged to the Little Bear, and found it just right, so he laid it down upon the intake manifold, and put the carboretor on it
|
![]() |
![]() |
![]() |
#22 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
well Donkey Kong, even with a single brand new base gasket between the intake and the carb (no spacer for now, keeping it simple) we got pretty much the same results
so then we found this Holley video - it claims an ignition problem, check spark plugs, plug wires, distributor, and coil How To Diagnose Common Engine Problems With A Vacuum Gauge https://www.youtube.com/watch?v=NrnzD7PgoHI |
![]() |
![]() |
![]() |
#23 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
well it's been like Amateur Hour over here on Team Shake 'n Bake I tell you, check out these spark plug gaps, this is rediculous
5 at .040" like they should ought to be was 2 too big, bigger than .045" and 1 too small, way too small, about .030" this team needs to shape up I tell you what Stu OBSERVATION: 1-6 look the same blackish/border line rich, 7-8 look lighter, a bit leaner |
![]() |
![]() |
![]() |
#24 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,828
|
Re: Restoring Rusty
and to add in salt to injury, check out how high my feeler gauge goes up to, ha ha, .035 man GM Gods sure have a sense of humor - had to resort to the goofy wire style one I swore I would never find a need for, lol
|
![]() |
![]() |
![]() |
#25 |
Registered User
Join Date: Dec 2011
Location: Morris, Alabama
Posts: 184
|
Re: Restoring Rusty
Can't you combine the .035 and .010 to get to your .045? That's the way I was shown by my dad when I was learning engine stuff.
|
![]() |
![]() |
![]() |
Bookmarks |
|
|