Originally Posted by Compass790
Well it looks like the washers seal the delivery
valve & delivery v/v holder from the plunger & barrel so I'd say it's possible for a leak path if they weren't good. There should be a torque setting for the delivery valve holder ( the part with the o-ring ) so you get the pressure on those washers right.
Doubt it will fix your white smoke problems but I hope you prove me wrong
Well......I'm absolutely delighted to prove you wrong Compass790!
I just went down to the boat and replaced the three 60c copper washers I was too lazy to replace yesterday (item 9 in the attached photo).
- The engine now idles, accelerates and runs much more smoothly. It feels like a different engine!
- There is almost no unburnt fuel
or smoke coming out the exhaust
- hot or cold.
- The spent cooling water
coming out of the tail pipe feels about 20 degC hotter than it was before I changed the washers.
I'm truly grateful that you mentioned those copper washers inside the injection pumps are supposed to be compressed.
I've come across chemical dosing pumps on process plants a few times that were pumping at the right stroke rate but the output was down. In all cases, there was an invisible internal pathway between the high pressure side and the low pressure side of the pump
- usually a sticking check valve, but inadequate internal seals
(eg. ones made of the wrong material and chewed up by acid or chlorine solution) can also be the culprit.
Essentially, anything that prevents the discharge volume per stroke of a positive displacement
pump from equalling the swept volume will decrease the delivery flow rate. In process plants we check this with a drawdown test - ie. comparing what the manufacturer says the pump should deliver at a certain speed to what it actually delivers.
Clearly the fuel
pressure delivered to the injectors has now increased significantly and the engine is loving it.
Boy am I stoked! In the past two days I've fixed an annoying smelly fuel leak and made my engine run significantly better for the princely sum of about $30 worth of parts
Many thanks to all who provided valuable advice
. This forum is well worth the price