My 1969 Datsun 521 kingcab diesel

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wayno
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Re: My 1969 Datsun 521 kingcab diesel

Postby wayno » Sat Jun 24, 2017 2:40 pm

Yea, right now I am thinking about all I am going to do when I tear into this engine next, I cut the inner pass. side fender well to install the air filter, I also cut the battery tray/hole an inch farther towards the firewall to move the battery back to make room for said air filter housing, so i want to repair the holes I made which basically consists of new battery tray sheet metal, maybe even move it towards the outer fender another inch, and then weld the air filter housing into the inner fender well.
I also want to change the power steering setup to a stock type for the diesel that I have on the engine in the shed, that will make room in the engine compartment for a real pre-filter with a water trap. that I have no where to put right now on the passenger side, it should also allow me to move the main fuel filter to a different place making changing my oil filter less of a hassle.
I plan on installing the injection pump on the engine in the shed on this engine to see if it changes anything.
This has been frustrating, I am not used to doing so much work on an engine and have it get worse instead of better, brakes on the other hand have done this to me in the past several times.
“The difference between genius and stupidly is that genius has its limits” Albert Einstein
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DRIVEN
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Re: My 1969 Datsun 521 kingcab diesel

Postby DRIVEN » Sun Jun 25, 2017 3:44 am

You'll get it all worked out. You always do.
When the only tool you have is a hammer every problem starts to look like a hippy.
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wayno
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Re: My 1969 Datsun 521 kingcab diesel

Postby wayno » Wed Jun 28, 2017 11:11 pm

I bought 5 gallons of diesel and piped it to pull the fuel out of the gas can instead of the tank, I still had power loss, but not as bad, but it was 70 degrees outside instead of 80 degrees plus when this issue started.
I am going to try something else likely Friday, I am going to remove the vent line from boost and try driving it on the hiway and see if I have power loss, if I don't have power loss then it is likely an issue that is caused by the way I have it piped or something else has changed on that drive.
It ran so good at first, and the 720 is piped the same way and runs great right now.
“The difference between genius and stupidly is that genius has its limits” Albert Einstein
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wayno
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Re: My 1969 Datsun 521 kingcab diesel

Postby wayno » Fri Jun 30, 2017 3:28 pm

OK, so I did something different today that I sorta tried before but I did it a different way this time and it made a difference.
I ordered this valve setup to control boost that has a valve and a tee, I tried it and it didn't work, the tee is sort of a one way tee.
This time I just used a regular tee and the valve, in the past if I just vented the vent line the engine surges like it wants to run away but when I let off the pedal it cut the air off so it could not surge anymore, but when going down the freeway or a steady 40mph it would still surge, an even speed was kinda a pain and it always ran real hot(EGTs), anyway I put the tee in the vent line between the turbo and throttle body and that tee connection goes to a valve on the passenger seat where I can control it.
I got in the truck and started it and let it warm up, then I took it for a drive, at first I could feel slight power loss so I kept opening the valve and it got better and better, I could lift the valve to my face and feel the air coming out of the fitting that had no hose on it, I drove it for over 20 miles, at around 12 miles I pulled the small hose off the valve and just let it vent, the engine ran pretty good, it still wanted to surge a little, but when ever I blocked the end of the hose with my finger I would have immediate power loss, let off and away it would go.
That said I also had another issue that bothered me, the water temp was as high as I have seen it, now as far as I recall when I have pulled the radiator cap in the past I could see the water flowing, so I believe the water pump is good, so I am now thinking that I may need a larger radiator, it works fine in the winter when it is cold outside, but today it is 90 degrees and my temp needle was over 3/4s of the way to pegged, my EGTs were a little higher(800 degrees once), but not enough to make me think the EGTs were causing the warm engine, it just might be without the turbocharger I was right on the edge, but with the turbocharger it just cannot cool it enough on the freeway when it is warm outside(over 70 degrees).
I drove it a steady 75/80mph when traffic allowed, it felt better than it has since the hood river trip, but still had slight power loss a few times when the valve was on the end of the line, after I pulled it off it was better, but as everyone knows, when one starts paying real close attention you notice things you may have not noticed before.
I will look into a larger radiator next and go from there.
I also have a lead on a new inline injection pump for an SD22, I am waiting for a price right now.
I also think something changed, maybe it has something to do with the diaphragm or the diaphragm spring, when I do the radiator I will also do the battery holder, air filter box, and maybe pull the diaphragm/spring and look at them, I have a new diaphragm and an extra spring, I also am planning on changing over to the stock diesel power steering setup to make room for a better/larger pre-filter with a water trap.
I do not believe the fuel tank or fuel were the issue now, I will likely also pipe the fuel lines back to the stock tank.
“The difference between genius and stupidly is that genius has its limits” Albert Einstein
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DRIVEN
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Re: My 1969 Datsun 521 kingcab diesel

Postby DRIVEN » Fri Jun 30, 2017 7:03 pm

I'd be curious to hear how it runs with the other pump.
When the only tool you have is a hammer every problem starts to look like a hippy.
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wayno
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Re: My 1969 Datsun 521 kingcab diesel

Postby wayno » Fri Jun 30, 2017 8:24 pm

I don't think it is the injection pump itself, it might be the diaphragm or diaphragm spring, or it might have something to do with heat, or maybe a combination, as it ran pretty good today, as I forced it to run richer.
“The difference between genius and stupidly is that genius has its limits” Albert Einstein
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wayno
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Joined: Thu Jun 27, 2013 8:44 pm
Location: Vancouver WA

Re: My 1969 Datsun 521 kingcab diesel

Postby wayno » Fri Jul 07, 2017 9:42 pm

It's running as bad as it ever has again, this is getting old.
“The difference between genius and stupidly is that genius has its limits” Albert Einstein

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