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Trucks, Trailers and Hauling for Shows

GMC 4 stroke V-6 diesels

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Old 06-20-2009, 12:31:14 AM
eddie bedwell eddie bedwell is offline
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Default Re: GMC 4 stroke V-6 diesels

someone most likely has pulled the Emergency Shut Down Knob/Cable and has set the Emergency Shut Off Flap, usually mounted at the scavange blower intake housing, to the air Shut Off position. It will need to be reset to the Run position by locating a small lever in the area indicated and moving it until it locks into the Run detent. Sorry I have no pic available to assist further.
Hope this helps.
Eddie B
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Old 06-20-2009, 07:29:31 AM
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MoRo MoRo is offline
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Default Re: GMC 4 stroke V-6 diesels

Unless it accidentally kicked back during starting and was running backwards!
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Old 11-02-2009, 06:45:28 PM
John C Walker John C Walker is offline
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Default Re: GMC 4 stroke V-6 diesels

Black smoke and no power , sounds like the blower drive has stripped. They were fairly famous for that.
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Old 12-08-2009, 10:45:56 PM
junkmandan junkmandan is offline
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Default Re: GMC 4 stroke V-6 diesels

Sounds like the emergency stop[ is tripped,shutting off the air .
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Old 12-08-2009, 11:37:58 PM
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Doug Oldenburg Doug Oldenburg is online now
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Default Re: GMC 4 stroke V-6 diesels

Originally Posted by Black Smoke Bus Man View Post
Hey I dont Know if I am posting in the correct place. I own a 1973 fish bowl bus 6v71 diesel engine detroit. Used to run great. Tried to fire in up, but it has no power and it just pours out black smoke. Someone know about my motor?
Sounds like the Blower is probably tripped.Try resetting it & will probably fire right up. WE used to love to trip it on guys that weren't used to a Detroit & it would really mess with them.
"So Much Iron & So Little Money"
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Old 04-06-2010, 12:33:25 AM
jimsride jimsride is offline
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Default Re: GMC 4 stroke V-6 diesels

Hello been awhile since i last was here but i am still looking for parts for this motor i have the dh478 we now have 3 but always need parts please contact me if any body has motors or parts
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Old 05-05-2011, 01:15:14 AM
sosa sosa is offline
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Default Re: GMC 4 stroke V-6 diesels

i recently bought a 1972 F259 with a 478 in it, it runs like a champ it has a starter problem but it gets like 18 to 19 MPG i am trying to find out what kimd of specs it has i also would like to know of any mods that you can think of or have heard of to make it run gooder
thanks sam
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Old 01-12-2012, 02:13:22 AM
kta1150c750 kta1150c750 is offline
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Default Re: GMC 4 stroke V-6 diesels

we had numerous of these engines that we used pumping water when we farmed east of two buttes,colorado back in the 1960s. but they were natural gas. i have built a few of them .gmc also built this v6 in a smaller cid, first was a 305,351 401 478 and a 702. yes, there was nothing that sounded any better than a 702 gmc pulling deep water at night. the ones that we had we would tune them up at night so that we could see the temp. of the 4 exaust manifolds because they had 2 separate impco carbs. and 2 separate distributers that had one right angle distributer drive. all of these engines in this family were a 60 degree v design. the biggest killer of these engines was rpm. as i recall the 478 a one gallon paint bucket would fit in a cylinder. i do have a manual and some parts books. by the way, none of these engines ever had a blower drive . that was only on the 2 cycle gmc or latter called it detroit diesel. from what i know about the toro flo engine they were not the best on the market , and they all smoked heavy when loaded, due to the fact they were n.a. non turbocharged. this was black smoke. if it makes alot of white smoke before it starts or after it starts, the fuel pump is either timed to slow, or sucking air on the suction side of the transfer pump,or it has very weak compression. there are a few other factors that it could have but not likely would be one or more bent rods or weak valves. that is about it, make sure the does not have any water in it.

---------- Post added at 02:13 AM ---------- Previous post was at 02:07 AM ----------

i forgot to mrntion that gm also built this toro flo in a v8 , it was 637 cid . there used to be a dealer in springfield colo. that had parts for them swanson machinery. i do know that melvin swanson is dead now. also forrester truck in amarillo was a kenworth dealer as well as a gmc dealer with lots of parts the owner was carrooll forrester in amarillo,texas
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Old 01-12-2012, 12:20:16 PM
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FWurth FWurth is offline
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Default Re: GMC 4 stroke V-6 diesels

We have a 63 GMC 3/4 ton pickup with the v6 gas here that at one time was run by the neighbor's mother. She rarely had to shift gears much, she just let it lug. Shame it isn't being used,was one tough truck. F.J.W.
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