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I have the OEM Ty395 Lift pump repaired _ as I suspected the mechanic put the check valve in hand pump in backwards … have to have a chat with that fella.
OK thanks Tommy
The SL4105ABT is not lubricated by the engine oil. It has its own oil sump, once I removed about a 1/4″ of what looked like undercoating, I found 2 drain plugs (one way up under the rear part of the pump, this one will test you when you reinstall it, unless you have the hands of a 5 year old. The other one is towards the front on the side of the injector pump ahead of the hand pump) the dip stick if located beside the hand priming pump.
Hi Bob
I have looked at the OEW fuel flow (as I understand it) and copied the flow. Red is discharge from the 12 V electric pump. The return from the side of the injector pump pistons (Green) feeds back through the OEM fuel filter and merges with the fuel coming from the sediment bowl (yellow). The return to the fuel tank is on the injectors (not shown). At this stage it is a concept, as she is running great now. Adjusted the valve tappet clearances as well and she fires right up.
I suspect the issue lies with the check valves in the OEM manual lift pump. I will find out today. The pump has always had oil + changed annually. Changed after each use once I noticed the issue (run time about 2 hrs). Lub oil level is stable now + no diesel present in lub oil, since O ring change.
Do you know if the SL4105ABT is crankcase lubricated _ or separate oil reservoir (as there is no dipstick or plugs I can readily find like on the TY395) ?
I was amazed as well that the small O ring was the only thing separating the injector lub oil and fuel side .. but there it is. Yes it is a tight squeeze to get the plunger back in.
I like the electric pump idea. :good: Would eliminate the possibility of contaminating the injector lub oil with diesel and destroying the injector pump. Supply side diesel fuel pressure @ 4 – 7 psi is low so regular diesel fuel lines should work.
Hi Bob
Hope you are enjoying retirement.
Took me a while to figure out what was what and how it would worked , no parts diagram. Everything inside looked good, a little wear on the fuel piston (polished a little bit on one side as opposed to the other) but not bad for 600+ hrs. Just finished bleeding the air (pain) and got her going. Filled the injector pump with oil and let her run up to temp. So far so good. Will monitor injector pump lub oil level and see how it goes ( at lease I know where to look next time). I believe you mentioned somewhere that you bought a new pump … who was the supplier?
Cheers Brian
Built this several years ago for removing alder bushes and other trash. Pins to the top of the dozer blade for easy installation and removal.
