gecko.cx wrote:UnclejakeNZ wrote:The Lucas CAV injection pump siezed and snapped in half
Where did your pump snap?
I bought a Linoln welder with a 4.236 that wouldn't start.
I lifted the top of the pump to discover it was 2/3 full of water (no rust though).
Haven't been able to bleed the pump, so assume it's not well inside.
The shaft snapped just aft of the side cover plate Gecko. The metering assembly was still spinning but the actual pump wasn't... so it took a while and two people to diagnose so a little vinegar sat in the injection pump for more than 24 hours.
There would have been a few tablespoons of vinegar in a full JCB tank of fuel. The machine idled for around 4 mins after we topped up the fuel from the contaminated drum.. and then slowed and stopped due to a vinegar/fuel reaction emulsion in the sediment filter.
We drained the tank, cleaned out the sediment filter,.lift pump, fuel lines and replaced the disposable fuel filter but couldn't get fuel to the injectors. When cranking the engine on the electric starter sometimes there was a weird squeal and the starter slowed. I couldn't work out where the noise was coming from... but it went away after I wiggled the alternator belt (coincidence obviously) so we kept trying to get fuel to the injectors using the starter motor and even ether.
When I finally took the pump apart there was corrosion on its internal surface - which assume was from the vinegar. The squeal would have been the pump to housing interface seizing.
I was very lucky to find a similar pump on a nearby farm I could take parts from.
P.S. i did all this on the edge of a very windy paddock with the front bucket down. It was not a comfortable experience. I also wouldn't recommend lying on gravel with vinegar running down your arm creating a puddle to soak your shirt. The small stones were sharp enough to puncture skin. The vinegar isn't much fun