OK - so work is continuing on the HD4 - am guessing but not for sure - that AC's Industrial Division went to Nelson for the mufflers for the OEM selection similar to the farm equipment side. When I purchased the machine the discharge from the exhaust was straight piped. When I asked about the muffler the previous owner said " it ran better that way". I am pretty sure that the running problem was more injector and injection pump timing rather than exhaust discharge through a muffler or straight pipe.
Having said that, I am looking to purchase an OEM NOS or good used muffler that I could use as a template to build my own. The OEM P/N is 245446 and shows a center inlet with an offset right discharge. According to the AC Model H-4 and HD4 Revised Parts Information manual TP-104-S1 there were no revisions to the OEM muffler part number so it looks like it was the same for the P/N for both the gas and diesel units throughout the production period.
Any guidance or sage advice regarding where I could secure a NOS or used muffler would be appreciated.
Respectfully, ~ Orangeman
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