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Our new bus broke down ): please read to help. star 1-30-03  
Hi... we were on our first trip with the new bus... 77 international. poor gas mileage made us turn around (2 miles to the gallon on a 15,000 pound, 30 footer). then, something happened and all of a sudden when you pushed down on the gas, it sounded like marbles- loud metal on metal. very random. it didnt make the sound when we let of the gas. the is an automatic allison transmission and a propane engine.
we still had accellerating power but only with the noise. we could accellerate slowly without getting the noise. we pulled over immediately and had it towed.
please email me with any suggestions as to what might be wrong.
Re: our new bus broke down ): please read to help. Chris 2-2-03  
See if your distributor is loose. If it happened suddenly, perhaps the distributor turned and advanced your timing. If it is advance it will cause the engine to ping or knock.

Also, check your oil pressure. It should be 20 - 60 psi depending on speed. If the pressure is gone it can cause lifters and bearings to knock.

Good luck,

76 International 54 passenger
Re: our new bus broke down ): please read to help. Mark O. 2-15-03  
2 MPG on propane is about as good as it gets. Even on gas an IHC bus rarely will get better than 6-7 MPG.

Since the noise only occurred when you had low manifold vacuum I would concur about some sort of distributor problems.

If you had a low oil pressure problem the noise would occur at any throttle position.

Mark O.
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