| [GMCnet] Getting to the reason this 78 GMC runs hotter then my last 78. [message #326276] |
Wed, 22 November 2017 22:47  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Winter is closing in. Down to 16 last night, up to a balmy 39 today. The GMC is in it's home at 70. Time to go looking. Drained the coolant so I could put my inspection camera in the radiator. As I suspected. Plenty of corrosion in the cross tubes. Then checked the radiator out of the burned 78. Perfectly clean. Answered that question. Next. Pull the water pump out to see if it's the correct higher volume pump. So since its out. And has about 12,000 miles on it. I'll replace it no matter what's there. Next. Put a new harmonic dampener in since the timing mark has moved. So since all this stuff is out. Put the new electrically controlled fan/clutch in that I got at the Elkhart GMCMI rally. So now. Bring on the heat next Summer. Bob Dunahugh
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| Re: [GMCnet] Getting to the reason this 78 GMC runs hotter then my last 78. [message #326277 is a reply to message #326276] |
Wed, 22 November 2017 23:03  |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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Bob,
Cool!
(I just couldn’t resist)
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, CA
Howell EFI + EBL + Electronic Distributor
> On Nov 22, 2017, at 8:47 PM, Bob Dunahugh wrote:
>
> Winter is closing in. Down to 16 last night, up to a balmy 39 today. The GMC is in it's home at 70. Time to go looking. Drained the coolant so I could put my inspection camera in the radiator. As I suspected. Plenty of corrosion in the cross tubes. Then checked the radiator out of the burned 78. Perfectly clean. Answered that question. Next. Pull the water pump out to see if it's the correct higher volume pump. So since its out. And has about 12,000 miles on it. I'll replace it no matter what's there. Next. Put a new harmonic dampener in since the timing mark has moved. So since all this stuff is out. Put the new electrically controlled fan/clutch in that I got at the Elkhart GMCMI rally. So now. Bring on the heat next Summer. Bob Dunahugh
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Getting to the reason this 78 GMC runs hotter then my last 78. [message #326385 is a reply to message #326276] |
Sun, 26 November 2017 22:06 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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Richard. The 403 was rebuilt by the PO in 1994. When I bought it in 2015. The engine had 1884 miles on the clock. Has about 12,000 miles now. The timing chain isn't of concern now. Normally you would have a good point. Bob Dunahugh
________________________________
From: Bob Dunahugh
Sent: Wednesday, November 22, 2017 10:47 PM
To: gmclist@list.gmcnet.org
Subject: Getting to the reason this 78 GMC runs hotter then my last 78.
Winter is closing in. Down to 16 last night, up to a balmy 39 today. The GMC is in it's home at 70. Time to go looking. Drained the coolant so I could put my inspection camera in the radiator. As I suspected. Plenty of corrosion in the cross tubes. Then checked the radiator out of the burned 78. Perfectly clean. Answered that question. Next. Pull the water pump out to see if it's the correct higher volume pump. So since its out. And has about 12,000 miles on it. I'll replace it no matter what's there. Next. Put a new harmonic dampener in since the timing mark has moved. So since all this stuff is out. Put the new electrically controlled fan/clutch in that I got at the Elkhart GMCMI rally. So now. Bring on the heat next Summer. Bob Dunahugh
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