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Try priming the pump first. Connect the water to the pump, turn the water on full blast, without turning the washer switch ON, pull the handle valve full OPEN. If water comes out, allow it to run to remove any air lock. When a steady stream appears, turn the pump switch on and see if pressure is present. If no pressure is found your inner pump is probably seized, seek repairs. If pressure pulsates, piston is worn or there is grit in the internals. Never add washing soda, grit, or corrosive chemicals before the pump to aid in cleaning, they will wear out the piston and score the sleeve.
No oil=distroyed top end and possibly crank bearings. Inspect the top end asap, you may use an inspection cam to seek out cylinder scuffing. If evident assume piston galling always assume the worst, tolerance in a ski piston to wall is thousandths of an inch it's much cheaper to replace piston/sleeve then split cases and repair mains
Sounds like you might have a little water in your fuel system, check the fuel filter for water then clean carbs, dont forget to check the gas tank for anything sitting in the bottom.
if i knew what engine this was i might remember from previous work but i seem to remember doing a water pump on a 4 inline single cam one and the marks were easy even for me but if unsure then make sure pistons are in the middle then look at the camshaft and time it up from their using basics then when you know its more or less correct you then look for any marks or a slot on the back of the cam that should be level ,so its basically no1 at TDC with inlet vale cam pointing to just closed and up and to the left and the exhaust cam pointing in the opposite direction with getting ready to open .Yes iam aware that some engine use valve overlap ect ect but follow this advice and cannot go wrong or crunch the valves ,take no1 plug out and use a long thing screwdriver to watch the piston movement although all engines have the keyway pointing to the top of the engine except on modern vehicles that do not have a keyway anymore .
The best way is take out the spark plugs and spray down the carburetor throats while the engine is turning over. The whole point of fogging oil is to fog the lower crankcase, crankshaft, bearings, and pistons and stop corrosion in the off season.
Take of the housing ,turn it over and you will see the under side of the auto mix dial , Then turn the auto mix dial to rinse only;
On the top of the piston you will see a small slot , this fits into
the out side spiral on the auto mix knob with the dial set to rinse only the top part of the spiail sould point to the courner
Tilt the piston slightly,then hook it on the point of the auto mix knob , when you turn the auto mix dial to heavy traffic the piston should slide down the outer spiral of the auto mix-dial , Put the housing back on with the auto mix dial set to heavy traffic, but make sure no tubes are trapped or this will stop the flow of water, i hope you can under stand what i have wrote ,Goodluck
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