6066 (1960-1966) GMC Truck Club

6066 (1960-1966) GMC Truck Club (https://6066gmcclub.com/index.php)

- Toro Flow Diesel Engines (https://6066gmcclub.com/forumdisplay.php?f=21)

- - Gmc d478 (https://6066gmcclub.com/showthread.php?t=51863)

GMCAUS

September 2nd, 2025 01:28 AM

Gmc d478

Hi all I have a GMC D478 in my boat in Australia just wondering if anyone would know if anywhere does parts for them? Would love to get a hold of a rebuild kit or pistons and rings.

Thanks

dsljim

September 2nd, 2025 10:56 AM

Re: Gmc d478

https://youtube.com/shorts/BuUL7iUOl...p3BksV-hcxoNh0

I have a marine 478 that's left hand rotation, very low hours.

BobBray

September 3rd, 2025 05:31 AM

Re: Gmc d478

Unfortunately, there isn't much available for Toroflow diesels any more. Some new parts, like bearings, valves, oil and water pumps occasionally show up on Ebay. Gaskets are very hard to come by, particularly the gaskets that differ from the gasoline V-6's. Best souce of Toroflow parts these days seems to be 'take out' used marine engines.

GMCAUS

September 3rd, 2025 07:21 AM

Re: Gmc d478

Quote:

Originally Posted by dsljim (Post 79012)

https://youtube.com/shorts/BuUL7iUOl...p3BksV-hcxoNh0

I have a marine 478 that's left hand rotation, very low hours.

That’s awesome have you used it?

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