Just the cylinder. It was pretty straight-forward, just don't lose the spring and ball when taking the old one off. I'm still looking for a schematic on how the ball engages with the spring, I assume the way I had it was correct.
Large end into pump, small end on the ball is correct.
Cool, thanks, that's how I installed it. Must be other issues, but given Franks' advice, I'll be pre-filling the filters from now on. Those pumps have never/rarely worked for me.
The new ones made a big difference for me, but it is a lot if pumping. But for once a year, good enough.
I know what the Caterpillar manual recommends. I am a huge Cat fan and find their equipment to be supremely well designed. However for the first 3 years I owned my 3116 engines, I spent more time messing with, replacing priming pumps that didn't work and cleaning up the mess they made than following Cats recommendations was worth. For the next 22 years, I manually filled the Racor and the Cat spin on filter with clean filtered fuel and never had a single problem but more importantly, no more spilled fuel in the bilge, and not once did I get air in the fuel system.
And, if you are stuck on not pre-filling the filters for some reason and don't want to spend a day pumping on that primer - you can advance the throttle to full and crank the engine; it will fill the final filter pretty fast as the throttle sets the pump cam and rack to full flow. It will cough and sputter but start pretty fast. But you always want to start with full racors - pre-fill those.
That is my understanding, not sleeved if you destroy a cylinder you replace the block. That said I have rebuilt a Porsche V8 that was supposedly unrepairable, an awesome shop relined the cylinders with a chrome like Nikosil coating (like a motorcycle) to the stock bore and provided rings appropriate for the new coating and kept the stock $500ea pistons). So with millions of these 3100 series in circulation I am certain someone out there has a way to do a repair.
