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[GMCnet] Did 78's have two different types of engine oil cooler lines? [message #304325]

Wed, 27 July 2016 09:03

BobDunahugh

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Registered: October 2010
Location: Cedar Rapids, IA

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The burned 78 lines are made up of 4 hoses, and two steel lines. The later ( by VIN, and after Jan1 of 78.) have just two rubber hoses total. Thus no steel lines. As a side note. The air ride system was also changed about this same time. Bob Dunahugh
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Re: [GMCnet] Did 78's have two different types of engine oil coolerlines? [message #304329 is a reply to message #304325]

Wed, 27 July 2016 09:50

USAussie

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Registered: July 2007
Location: Sydney, Australia

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Bob,

I copied this out of X-7525 which covers 73, 74 & 75 GMC's:

http://www.gmcmhphotos.com/photos/455-2f-403-engine-oil-flow-path/p53466-olds-455-oil-cooler-lines.html

I copied this out of X-7725 which covers 77 & 78 GMC's:

http://www.gmcmhphotos.com/photos/455-2f-403-engine-oil-flow-path/p49555-olds-403-oil-cooler-lines.html

I believe the lines were changed when the engine went from the 455 to the 403.

Parts Book 78Z Page 8-12 Section 8-012 Oil Lines shows a change effective in 1977.

8.012 LINES--OIL
694300 HOSEASSY.-feed engine oil cooler (413610.416542.417794.418694 engine)
694533 HOSEASSY.-return, engine oil cooler (413610.416542.417794.418694 engine)

719292 HOSEASSY.-engine oil filter to radiator (eff. w/interm 1977) (w/556626. 556627. 561032. 561033 engine)
719293 HOSEASSY.-radiator to engine oil filter (eff. w/interm 1977) (w/556626. 556627. 561032. 561033 engine)

Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Bob Dunahugh
Sent: Thursday, July 28, 2016 12:04 AM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Did 78's have two different types of engine oil coolerlines?

The burned 78 lines are made up of 4 hoses, and two steel lines. The later ( by VIN, and after Jan1 of 78.) have just two rubber
hoses total. Thus no steel lines. As a side note. The air ride system was also changed about this same time. 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] Did 78's have two different types of engine oil cooler lines? [message #304342 is a reply to message #304325]

Wed, 27 July 2016 11:20

emerystora

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Registered: January 2004

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You must have oil cop;er lines for a 455. The 403 had just single rubber lines. The 455 had the steel section in the center when it passes over the heat from the exhaust manifold.

Emery Stora
77 Kingsley
Frederick, CO

> On Jul 27, 2016, at 8:03 AM, Bob Dunahugh wrote:
>
> The burned 78 lines are made up of 4 hoses, and two steel lines. The later ( by VIN, and after Jan1 of 78.) have just two rubber hoses total. Thus no steel lines. As a side note. The air ride system was also changed about this same time. Bob Dunahugh
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> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

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