GMC 4107 and 8v71T digital repair manuals needed! Bus broke far from home

[69M4107]

Hey everyone,  Like the title says my 1969 GMC 4107 powered by an 8v71T and upgraded to an Allison V730 automatic is on the side of the road and I really need repair manuals for both the coach and engine with electrical diagrams. I'm over 400 miles from home, Its 22°f and I would like to get her going ASAP. Please if you have a manual for either in digital format and can send it to me I would sincerely appreciate it. If you have one in hard copy and are close to Grandview, WA, I am willing to pay you to borrow it. Thanks for reading my post!

[richard5933]

I can scan the electrical section of the manual you.

If you can get the engine to turn over by jumping the starter relay, you should be able to get the engine running. You need to verify that the transmission shifted into neutral before shutting down (regardless of what it says up front) or manually move it into neutral.

Once the engine turns over and the transmission is in neutral, you need to get the fuel to flow, which may require disabling the shut down cylinder (or moving it out of the way). Then you will know that the problem doesn't lie with the engine or starter itself and can start chasing down the bad connection or stuck relay. Make sure you can manually push the governor lever into the no-fuel situation to shut down the engine while testing, and/or that the emergency flapper is working.

Feel free to call me when you're back to the bus and I will do what I can to help you get the thing running.

[69M4107]

Thanks Richard! I'm really hoping its just ground problem and the electrical section of the manual will make things a whole lot easier on me especially in 22° weather!! Oh, and  I was wrong when I said I had no N on the shifter. The bus is in neutral and ready to start. Where is the governor lever located? And what is your concern with it?

I can scan the electrical section of the manual you.

If you can get the engine to turn over by jumping the starter relay, you should be able to get the engine running. You need to verify that the transmission shifted into neutral before shutting down (regardless of what it says up front) or manually move it into neutral.

Once the engine turns over and the transmission is in neutral, you need to get the fuel to flow, which may require disabling the shut down cylinder (or moving it out of the way). Then you will know that the problem doesn't lie with the engine or starter itself and can start chasing down the bad connection or stuck relay. Make sure you can manually push the governor lever into the no-fuel situation to shut down the engine while testing, and/or that the emergency flapper is working.

Feel free to call me when you're back to the bus and I will do what I can to help you get the thing running.

[richard5933]

If you're asking where the governor lever is, then we need to talk before you start doing anything.

Something is keeping your engine from cranking and/or starting. Once you get it to crank by jumping the starter, that something may still be keeping the fuel shut off cylinder engaged, keeping the engine from running. If that's the case, then a way to get it running in an emergency is to "bypass" the shut down cylinder.

If you "bypass" the shut down cylinder, then the only way to shut down the engine is to manually move the governor to the no-fuel position (better option) or to engage the emergency shut down flapper (not recommended unless it's an emergency).

Here's the sections of the manual for the electrical system up to and including the starting system. I didn't include the generator or lighting, since they're unlikely involved in this.

I'll scan the front of the engine section so you can get a basic understanding of things.

[richard5933]

Here's the start of the engine section that might be useful. Pay particular attention to the sections on SOLENOIDS and ENGINE CONTROL CYLINDERS.

I sent photos of the two relevant wiring diagrams the other day when you started the other thread.

Let me know if you need other sections/pages/diagrams.