Home » Public Forums » GMCnet » [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem
| Re: [GMCnet] Free Radiatior internal camera inspection, with radiator/cap pressure test. [message #327734 is a reply to message #327724] |
Thu, 04 January 2018 05:28   |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Bob,
Well done!
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Bob Dunahugh
Sent: Thursday, January 4, 2018 12:28 PM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Free Radiatior internal camera inspection, with radiator/cap pressure test.
Subject line more appropriate.
Looking into doing this at the GMCMI Tucson Rally. If this works well. Maybe this could be added to future GMCMI rallies, and
regional club rallies. I think this is a bigger problem then thought.
I had mentioned this to Kim this morning. We're not taking anything big apart. Drain fluids onto a pan. Do the camera
inspection. Pressure test radiator, and cap. Put the antifreeze back in. There's just nothing to dispose of. If owners want to
change their antifreeze at the same time. They can bring new antifreeze and distilled water. Then put that used antifreeze into
those then empty containers. Thus nothing to dispose of at the rally site. I can find a place to recycle in the area as needed. Alex
might be there to fix steering issue. There have also been weigh ins, headlight alignments, and many other tech sessions to make
your GMC safer.
This internet site is a fantastic GMC info site. And I think that's it's major intention. Be very nice if GMCMI rallies with
it's tech sessions, and regional club with their tech sessions be listed here at times. We're near the 6 Wheelers. If their rallies
were mentioned here. Linda, and I would more then likely go. Any input? Bob Dunahugh
Pete. That's a good idea. The owner could just bring new antifreeze. Flush, and then put the new antifreeze in. Have to find out
what's the best way to dispose the old antifreeze there. We'd also have to have a pre event registration list to know what to be
prepared for. Bob Dunahugh
Mike K. Thanks. I think this is more of a problem then is generally thought. I pull higher GVW's more then most. And never had any
add on items installed on our 403 GMC. Radiator inspections on attendees GMC's. Might make for a good tech session at the GMCMI
rally in Tucson. Line them up, and start checking with my inspection camera. Drain pan, funnel, and the camera. At a cost of FREE.
Good idea, or not. Any input out there? Bob Dunahugh
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Free Radiatior internal camera inspection, with radiator/cap pressure test. [message #327763 is a reply to message #327724] |
Thu, 04 January 2018 12:14 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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I As many know that there are places like Face Book, and club sites out there to see schedules. I just don't think of searching these things out on a general bases. ( Well. I just don't. SORRY ) I'm sure this is a common occurrence with those here. All the clubs in the GMC community put on events in hopes that more will come to enjoy the company of others. The more exposure of up coming event. The more can think of coming. Or if we're going to an area in the country. I just won't think of a search. But if a club, or GMCMI just put something out as to an event in different areas here. As this site is the only site I ever go to. I'm mainly not interested in what color that an owner painted their cabinets. Interesting to some. Just not my thing.That would put these events in my attention focal point. It would get my attention as to a club event that's going to be 20 miles from were we'll be. Is there a down side of various club events being promoted here by any GMC club? Or cross promo's between clubs. We're not a stag net group by our nature. The only bad promo to me is the one not put out in every venue in the committee.
Bob Dunahugh
Member Greater Midwest Classics
GMCMI
________________________________
From: Bob Dunahugh
Sent: Wednesday, January 3, 2018 7:28 PM
To: gmclist@list.gmcnet.org
Subject: Free Radiatior internal camera inspection, with radiator/cap pressure test.
Subject line more appropriate.
Looking into doing this at the GMCMI Tucson Rally. If this works well. Maybe this could be added to future GMCMI rallies, and regional club rallies. I think this is a bigger problem then thought.
I had mentioned this to Kim this morning. We're not taking anything big apart. Drain fluids onto a pan. Do the camera inspection. Pressure test radiator, and cap. Put the antifreeze back in. There's just nothing to dispose of. If owners want to change their antifreeze at the same time. They can bring new antifreeze and distilled water. Then put that used antifreeze into those then empty containers. Thus nothing to dispose of at the rally site. I can find a place to recycle in the area as needed. Alex might be there to fix steering issue. There have also been weigh ins, headlight alignments, and many other tech sessions to make your GMC safer.
This internet site is a fantastic GMC info site. And I think that's it's major intention. Be very nice if GMCMI rallies with it's tech sessions, and regional club with their tech sessions be listed here at times. We're near the 6 Wheelers. If their rallies were mentioned here. Linda, and I would more then likely go. Any input? Bob Dunahugh
Pete. That's a good idea. The owner could just bring new antifreeze. Flush, and then put the new antifreeze in. Have to find out what's the best way to dispose the old antifreeze there. We'd also have to have a pre event registration list to know what to be prepared for. Bob Dunahugh
Mike K. Thanks. I think this is more of a problem then is generally thought. I pull higher GVW's more then most. And never had any add on items installed on our 403 GMC. Radiator inspections on attendees GMC's. Might make for a good tech session at the GMCMI rally in Tucson. Line them up, and start checking with my inspection camera. Drain pan, funnel, and the camera. At a cost of FREE. Good idea, or not. Any input out there? Bob Dunahugh
Our first 78 Royale came with a Digi panel. I knew my engine temps under all conditions. Then the fire. Bought another 78 Royale. But the Digi panel wasn't being made at that time. Both GMC stock temp gauges read the same. But it didn't take long before I had a feeling that this second Royale was running hotter. No boil overs. Just didn't feel right. So on our next trip. I raise the engine cover several times to check the engine temp sender with an inferred temp reader. Found that this Royale was generally operating about 10 degrees hotter with the stock gauge reading in the normal range as compared to our first GMC. Jim at Applied GMC had started producing the Digi panel. And had them at the GMCMI rally that we were going too. Installed the Digi panel at the rally. On the way home the panel also confirmed what I thought. So why the running hotter? Checked the thermostat. It was a good operating 180. But I changed to a proper 195. Fan clutch? Maybe. Well Jim K at Applied started selling a fan clutch that is controlled by engine block sensors. I liked the idea that this system is more proactive in controlling engine heat buildup. Plus I can turn the clutch on for the fan by a dash mounted switch when I want. So I bought that fan clutch at the GMCMI rally. I had recently put on an aluminum 307 Olds intake manifold. So I knew the engine was clean inside. Did the engine have a car water pump? Don't know. But even if there's a car pump. That's not the real big problem. Next I drained the radiator. Put my inspection camera in the radiator. Radiator's my problem. Looked heavily corroded at the crossover tubes. Going to put the radiator from the burned GMC in soon. Probably check/change water pump anyway while I'm doing other work in that area. Installing more gauges to look at isn't the best idea in my opinion. One. I want to be looking at the road for safe driving. Two. The Digi panel has gages. But it's audible alarm is your best engine/trans protection.
Bob Dunahugh 78 Royale
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| Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem [message #327858 is a reply to message #327671] |
Sat, 06 January 2018 07:56 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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looking at the fins isn't going to matter whether there's coolant in the radiator or not since they're outside the tubes. A quick look inside might well show clear coolant and smooth tubes, negating the need to drain the thing. It might not. The salient point is, neither I nor you nor Bob knows whether this is a worthwhile action or not until it's tried. Given the ease and simplicity, it ought to be worth a try, which would tell us quickly a usable technique or not.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem [message #327882 is a reply to message #327792] |
Sat, 06 January 2018 11:28 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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Johnny. The outside fins can have separation from the outside of the coolant tubes that go horizontally across the radiator. This is simple to do by simply looking.. These outside fins also need to be inspected with the use of a flashlight at night. Have someone shine a flashlight from the back of the radiator. Then have someone else at the front to look for areas that are plugged up with bugs. I have a bug screen in front of my radiator that I got from Jim K at Applied GMC. Compressed air, or water can be used to clean the bugs out. Our real problem is that we can't look inside our radiators. I've tried mirrors. Didn't work. This camera inspection will see if there's corrosion on the inside that isn't going to be an obstruction to coolant flow. The coolant needs to be removed for a clearer view inside. Plus I don't want to find out the hard way if my camera is truly water proof. Bob Dunahugh Member GMCMI and Greater Midwest Classics
________________________________
From: Bob Dunahugh
Sent: Thursday, January 4, 2018 9:13 PM
To: gmclist@list.gmcnet.org
Subject: RE: The stock temp gauge doesn't really tell you your operating temps. Why that's a problem
Johnny. The problem s there are that the radiator should be full if the overflow tank is at it's correct level. Next. The corrosion at the top could be drastically different farther down. The radiators have drains at the bottom that is simple to open. Good thought though. Bob Dunahugh
________________________________
From: Bob Dunahugh
Sent: Tuesday, January 2, 2018 5:08 PM
To: gmclist@list.gmcnet.org
Subject: RE: The stock temp gauge doesn't really tell you your operating temps. Why that's a problem
Mike K. Thanks. I think this is more of a problem then is generally thought. I pull higher GVW's more then most. And never had any add on items installed on our 403 GMC. Radiator inspections on attendees GMC's. Might make for a good tech session at the GMCMI rally in Tucson. Line them up, and start checking with my inspection camera. Drain pan, funnel, and the camera. At a cost of FREE. Good idea, or not. Any input out there? Bob Dunahugh
Our first 78 Royale came with a Digi panel. I knew my engine temps under all conditions. Then the fire. Bought another 78 Royale. But the Digi panel wasn't being made at that time. Both GMC stock temp gauges read the same. But it didn't take long before I had a feeling that this second Royale was running hotter. No boil overs. Just didn't feel right. So on our next trip. I raise the engine cover several times to check the engine temp sender with an inferred temp reader. Found that this Royale was generally operating about 10 degrees hotter with the stock gauge reading in the normal range as compared to our first GMC. Jim at Applied GMC had started producing the Digi panel. And had them at the GMCMI rally that we were going too. Installed the Digi panel at the rally. On the way home the panel also confirmed what I thought. So why the running hotter? Checked the thermostat. It was a good operating 180. But I changed to a proper 195. Fan clutch? Maybe. Well Jim K at Applied started selling a fan clutch that is controlled by engine block sensors. I liked the idea that this system is more proactive in controlling engine heat buildup. Plus I can turn the clutch on for the fan by a dash mounted switch when I want. So I bought that fan clutch at the GMCMI rally. I had recently put on an aluminum 307 Olds intake manifold. So I knew the engine was clean inside. Did the engine have a car water pump? Don't know. But even if there's a car pump. That's not the real big problem. Next I drained the radiator. Put my inspection camera in the radiator. Radiator's my problem. Looked heavily corroded at the crossover tubes. Going to put the radiator from the burned GMC in soon. Probably check/change water pump anyway while I'm doing other work in that area. Installing more gauges to look at isn't the best idea in my opinion. One. I want to be looking at the road for safe driving. Two. The Digi panel has gages. But it's audible alarm is your best engine/trans protection.
Bob Dunahugh 78 Royale
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