#11
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Not so much resealing the pressure regulator as bumping up its preload.
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1985 744 gle d24t 1985 745 gle d24t |
#12
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Took the regulator out and the seals were all dry and cracked. I replaced those and tried to bump the pressure. I thought it moved a bit but there is no difference in the timing. How hard are you supposed to "bump" that stop? Anyone ever tap is for a set screw instead?
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#13
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I have a theory the motors which run stronger on veg oil are the ones with way below par dynamic advance, and ULSD makes it even worse.
When I checked mine it wasn't far off spec. Being on the bottom where grit collects probably doesn't help any. I also had one apart where the advance ring had worn pretty significantly into the pump housing. |
#14
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Too much internal pressure and it will start blowing seals... Some sort of a screw-down micro adjuster would be an improvement. NOTE: I would not attempt any of this without getting baseline measurements of the internal pump pressures at various RPMs. Before and after PSI readings, to be sure. Wasn't that your plan?
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1985 744 gle d24t 1985 745 gle d24t |
#15
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Quote:
How did you measure the dynamic advance?
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1985 744 gle d24t 1985 745 gle d24t |
#16
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Well that was the plan except for the part where I am limited on time and and don't have the proper fittings to execute it at the moment. Everything points to low pump pressure so I don't feel I am taking too big of a risk in increasing it. The logic is if i increase pressure a small amount it should be evident in the timing advance (or less retard in my case.) If it blows a seal in the process I wont be devastated in finding another pump to go through and swap in.
I am going to pull it again tomorrow and disassemble the whole pressure regulator. I will measure the stock location of the stop and put some effort into getting it to move one way or another. Maybe I will even make an adjuster for it. |
#17
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Quote:
Quote:
Don't bother taking it apart just make a punch with a stop, and drive it deeper.003-.005 a shot. |
#18
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The pump sits ~8" under the cowel on the land rover. I have to take it apart to adjust it :-/.
Interesting about it not working at higher rpms. I am going to try it on my 4bt tomorrow and see how that works. That has a brand new pump in it so it SHOULD advance correctly. |
#19
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Tonight I pulled the regulator and used a vise to push the stop .030". Wow its a totally different animal. Pump needs a re tune, nothing but thick black smoke. The egts are still sky high but it now seems very over fueled. Base timing jumped to 17 and it it only goes up a couple degrees when I rev it. Ill sleep on it and make some more adjustments in the morning.
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#20
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Poor thing was probably starving the whole time.
A wise man would tell you the sweet spot will be right around 12 unless the advance piston is messed up. Last edited by 745 TurboGreasel; 04-26-2014 at 12:05 AM. |
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