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Date Posted: 10/ 26/ 05, 11:42am
I have the same 12.5 Kohler with the Perkins on my 83 PT40. Here's the cross referencee chart that I built for my genset filters.
As far as changing the filters, if you have a Racor filter on yours, remove cover, remove filter cartridge, insert new racor filter cartridge, re-fill filter housing with fresh diesel fuel (or ATF), replace new rubber o-rings on cover (two - one on cap, one on center bolt) and re-install cover. That's the easy one.
As for the fuel filter on the side of the engine, it's a real pain as it is an insert filter, sandwiched between the housing top which is attached to the engine block and the bottom cap which comes off with the filter. The filter and the bottom cap are held in place with a bolt that extends down through the top, through the filter and screws into the bottom cap. You should have instructions in your blue box for changing this filter, but the way that works for me is messy, but as follows: hand under filter assembly, remove bolt on top (7/16" maybe? - also may need to remove hollow stud with two fuel lines covering the center bolt in order to remove the 7/16 bolt), discard old filter, remove rubber o-rings in top cap (two - one in cap, one on center bolt) and replace with new (light coat of grease holds them in place), place new filter in bottom cap (may be a new o-ring there also, can't remember). Then (here's where it gets messy) I hold the filter and bottom cap tightly together, fill with fuel and carefully place it up in the top cap and re-tighten the center bolt. Messy, but saves bleeding time. You can finish filling the filter by carefully pouring more fuel down the hollow stud mounting hole. You can then try to pump the little AC primer next to the filter, but I've never seen it do much to prime the system. Almost assuredly, you will need to crank the engine while loosening the injectors until you bleed the air out of them and the engine re-fires as you re-tighten the injectors. Really a fun job. NOT. Sometimes the Perkins engines can be a real bear to get re-primed. Don't overheat the starter by cranking too long at any one time, and don't run your battery down if it doesn't start fairly quickly (throw a battery charger on the battery while doing the bleeding, if necessary to keep from running it down).
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