Author Topic: running issues with new batch (Read 13499 times)

alexanderfoti · « **Reply #15 on:** February 07, 2016, 08:39:40 PM »

Something I did not mention. If I run the glow plugs manually, it runs ok....

I wonder if poor spray pattern would cause it to not run properly at all.

GedsJeep · « **Reply #16 on:** February 08, 2016, 12:27:15 AM »

would that be because the cylinder is hotter, ergo the veg is hotter, ergo thinner?......

GedsJeep · « **Reply #17 on:** February 08, 2016, 12:29:24 AM »

try this.

filter veg to 1 micron outside.

take tub in house.

drain engine of veg

take in house

leave overnight

put warm veg in warm engine and run.

let us know.......

alexanderfoti · « **Reply #18 on:** February 08, 2016, 01:24:48 PM »

I have decided to do the following:

Rebuild pump - can rule this out after that. (being sent off)
Rebuild injectors myself - I will be installing Monark nozzles, as these are well known in the Mercedes circles for being great on wvo. I cross referenced stuff until I came up with the equivalent monark pn for the kubota nozzle (DN12SD12 = Monark 39305027 btw)
Have a pop tester and shim kit on its way too.

AS the engine is of unknown hours (As is the fuel system) I think its the best way to go

The nozzle sprays straight onto the tip of the glow plugs, so I would think that the spray pattern must be so poor that it doesn't run correctly unless the glow plug is vaporising the veg as it hits it.

alexanderfoti · « **Reply #19 on:** February 08, 2016, 01:25:13 PM »

Quote from: GedsJeep on February 08, 2016, 12:29:24 AM

try this.

filter veg to 1 micron outside.

take tub in house.

drain engine of veg

take in house

leave overnight

put warm veg in warm engine and run.

let us know.......

Funny, I Was thinking of pumping hot coolant through the engine and trying it like that, easier than getting a motorbike in a 2nd floor flat

GedsJeep · « **Reply #20 on:** February 08, 2016, 01:48:29 PM »

oh, going for the easy option i see

alexanderfoti · « **Reply #21 on:** February 08, 2016, 01:49:09 PM »

Quote from: GedsJeep on February 08, 2016, 01:48:29 PM

oh, going for the easy option i see

Tony · « **Reply #22 on:** February 17, 2016, 05:13:20 PM »

Quote from: alexanderfoti on February 08, 2016, 01:24:48 PM

I have decided to do the following:

Rebuild pump - can rule this out after that. (being sent off)
Rebuild injectors myself - I will be installing Monark nozzles, as these are well known in the Mercedes circles for being great on wvo. I cross referenced stuff until I came up with the equivalent monark pn for the kubota nozzle (DN12SD12 = Monark 39305027 btw)
Have a pop tester and shim kit on its way too.

AS the engine is of unknown hours (As is the fuel system) I think its the best way to go

The nozzle sprays straight onto the tip of the glow plugs, so I would think that the spray pattern must be so poor that it doesn't run correctly unless the glow plug is vaporising the veg as it hits it.

It would be interesting to know how the injectors behave differently between veg oil and derv in terms of their spray pattern (or jet, depending on how bad they are!)

alexanderfoti · « **Reply #23 on:** February 17, 2016, 05:32:18 PM »

Well, the pop tester arrived recently, and the nozzles today.

I haven't had a chance to play, but did get some on the pop tester.

The two I tested aren't in the engine at the moment, but run the same as the the others that are. One has a singular jet of fuel and dribbles at pop pressure.

The other sprays 4-5 jets of fuel with little misting! Same on the dribbling. I suspect this is the issue. I will try and get a video when I get a chance.

Tony · « **Reply #24 on:** February 17, 2016, 06:35:58 PM »

I'm sure it will be satisfying to get them spraying properly, and you never know, the ones in the engine might not be as good as you think they are.

alexanderfoti · « **Reply #25 on:** February 17, 2016, 06:40:31 PM »

Quote from: Tony on February 17, 2016, 06:35:58 PM

I'm sure it will be satisfying to get them spraying properly, and you never know, the ones in the engine might not be as good as you think they are.

Agreed.

Pop pressures on the ones I have out are 20bar apart.

Jamesrl · « **Reply #26 on:** February 17, 2016, 07:41:52 PM »

Quote from: alexanderfoti on February 17, 2016, 06:40:31 PM

Pop pressures on the ones I have out are 20bar apart.

Wow 294psi difference.

alexanderfoti · « **Reply #27 on:** February 27, 2016, 11:53:45 AM »

New spotless injectors in today.

All pop tested at 125 bar - that' 10 bar below normal spec, as per some stuff I read on here. Nice spray pattern etc.

Starts much easier, but, no dice, exactly the same as before:

https://www.youtube.com/watch?v=SJ3ZukhqL1M

I did have a second hand pump to go in, but the rack is completely seized and 2 of the 3 plungers are stuck, so back to the seller that goes!!!!

I'm begging to think its the pump, as its ok at higher rpm.

Update from today:

Brand new SAEJ30R9 fuel lines, well fitting clamps etc.

No lift pump, engine lift pump or wired lift pump, supply and return into large container of fuel.

All produce the same symptoms, I am still very suspicious of the fuel pump, my replacement "good" pump from ebay has a frozen rack, so I have to wait for it to go back before I can test out that theory.

Still think its the injection pump.

Tony · « **Reply #28 on:** February 27, 2016, 11:01:11 PM »

Even not running properly it still sounds delicious

So sorry to hear after all that work that it still doesn't run properly.

Have you tried it on biodiesel at all?

alexanderfoti · « **Reply #29 on:** February 27, 2016, 11:03:17 PM »

Heh thanks, when it's running properly it's even better!

I did around 2000 miles ago and it was fine, but a lot has likely changed in the whole fuel system since then

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