SuperChip and MSD Propane Rod Failure - Diesel Truck Forum -
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post #1 of 2 (permalink) Old 12-22-2007, 10:08 PM Thread Starter
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SuperChip and MSD Propane Rod Failure

I have a "late" 1999 F-350. I installed the SuperChip program (High Perform) at 100,000 miles. I installed the Propane injection at 125,000. At 194,000 I melted a piston and needed to sleeve a cylinder. I later learned that I did not have the Pyro in the proper place. The #3 piston looked like a mushroom when I tore it down. I take total blame for this 194,000 failure.

I spent $5,000.00 for R&R and various parts and injectors. I spent $4,750.00 at the machine shop. The machine shop first claimed to have a master rebuild kit which I thought included rods (at $2,900.00 it should have). I guess I was wrong. When the engine thru a rod thru the block at 6,000 miles after rebuild I called Karl's Machine Shop whom then claimed to have replaced 1 rod. Upon tearing down the engine it appeared that all the rods were original. The machine shop then claimed to have inspected and reused all 8 rods.

Now Karl's Machine Shop is claiming that the motor recieved liquid propane from the MSD injection system. There is no evidence to support this. But it seems that he is trying to get out of the 1 year warranty. He knew that the engine had a chip and propane when he gave me the one year warranty.

How strong are the 7.3 forged rods (not the powdered metal)? Should they be reused after a direct failure such as a melted and beaten piston ? What is the proper procedure to inspect, and re-use rods ? What do the remanufacturers do to inspect rods ? What should I do next ?

Bradley's Diesel Injection did the R&R and dressed the engine. Bradley's has treated me great during this trying matter. Also I have found a Basin Machine in Klamath Falls whom seem to be a better choice than my last.
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post #2 of 2 (permalink) Old 12-26-2007, 01:01 PM
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This would get more response in the regular 7.3 section.

With a Superchips and a bunch of propane I don't doubt that your timing would be advanced far engough to break a rod. Your best bet for future use would be to get a custom tuned chip such as one from If you still want to take the chance of running the propane you can but tell them that you are running it so that the tuning can be adjusted for it.

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