Author Topic: New forum member attempts 6.9 resurrection  (Read 20944 times)

1960mog

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Re: New forum member attempts 6.9 resurrection
« Reply #15 on: 17 June 2013, 01:45 PM »
Thanks Squiggle dog.
I have to wait for the next one.
Will check the Las Vegas Pick a Part a.s.a.p.
There was a 6.9 in that yard about a year ago.
Wasn't much left of it when I was there and I didn't need any 6.9 parts at the time.
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79 6.9 #6669

oversize

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Re: New forum member attempts 6.9 resurrection
« Reply #16 on: 17 June 2013, 05:29 PM »
Wow you did a great job cleaning up the air flow assembly!  What would I do next?  Clean the rest of the fuel system and get her running....  Then you can assess what's the next priority.  Maybe even give her a short, carefully drive to help with your inspection.  After she's warmed up, I'd look at changing ALL the fluids and filters.  Check all the electricals while the engines running and you have full battery voltage.

I wouldn't touch the water pump or inlet manifold unless necessary
1979 6.9 #5541 (Red Bull)
1978 6.9 #4248 (Skye)
1979 6.9 #3686 (Moby Dick)
1978 6.9 #1776 (Dora)
1977 450SEL #7010 white -P
1975 450SEL #8414 gold -P

1960mog

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Re: New forum member attempts 6.9 resurrection
« Reply #17 on: 18 June 2013, 08:00 PM »
Wow you did a great job cleaning up the air flow assembly!  What would I do next?  Clean the rest of the fuel system and get her running....  Then you can assess what's the next priority.  Maybe even give her a short, carefully drive to help with your inspection.  After she's warmed up, I'd look at changing ALL the fluids and filters.  Check all the electricals while the engines running and you have full battery voltage.

I wouldn't touch the water pump or inlet manifold unless necessary

That sounds like good advice.
Getting the engine running is my next priority.
I have to feed her from a gas can, since the fuel lines are still plugged up by the" Old Fuel, and who knows what is in the tank.
The injectors are my next problem, i hope I can save them, and there is no way I can check the WUR till the engine is running.
I will change the oil, I am not running that engine with 14 year old oil.
I keep you posted.

Thanks
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79 6.9 #6669

oversize

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Re: New forum member attempts 6.9 resurrection
« Reply #18 on: 19 June 2013, 02:24 AM »
Compare the cost of getting them ultrasonically cleaned vs new injectors.  I'd probably get the WUR internally cleaned and calibrated due to the condition of the old fuel...

Drain the old oil for at least a week and don't forget to pull the drain plug on the side oil tank.  I'd then flush the tank with kero (with both sump plugs removed) in a pressure spray gun and drain it for a further week.
1979 6.9 #5541 (Red Bull)
1978 6.9 #4248 (Skye)
1979 6.9 #3686 (Moby Dick)
1978 6.9 #1776 (Dora)
1977 450SEL #7010 white -P
1975 450SEL #8414 gold -P

1960mog

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Re: New forum member attempts 6.9 resurrection
« Reply #19 on: 19 June 2013, 08:21 AM »
Ultrasonic cleaning sounds good, but I don't know anybody who can do this around here.
I can get the injectors clean and I can test them.
My car still has the old steel injectors.
Can I use the newer brass ones for a 6.9, or do I need something special.

Do you know anybody in the US who can calibrate the WUR, or who sells a rebuild kit for it?

The oil is draining right now.
I am thinking to take the oil tank out to clean it.
78 6.9 #4084
79 6.9 #6669

1960mog

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Re: New forum member attempts 6.9 resurrection
« Reply #20 on: 20 June 2013, 09:49 PM »
 I removed the oil tank today and it looks like that it got hit in a accident before.
There is a kink on the side facing the right fender.



It did not leak any oil, so it should be still useable.



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79 6.9 #6669

1960mog

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Re: New forum member attempts 6.9 resurrection
« Reply #21 on: 01 July 2013, 10:01 PM »
Hi

I tried to test my injection system last weekend.

Here is a pic of the setup.



Most of the injectors have a ok spray pattern, and the cold start valve works fine.

The System pressure is 75 to 76 psi. It should be around 81 psi.

The control pressure starts low, at about 20 psi, then slowly creeps up to 70 psi.

The WUR has a bad diaphragm, and I did not hook up the heater in the unit.

Normally you would test the system on a the running engine, with fuel flowing to the injectors.

There is no fuel accumulator in my setup, just a pump and a filter fed from a gas can.

Is it even possible to get a good reading from a setup like this?

Is it possible to get a repair kit for the WUR?


I scored a timing chain on ebay.

Can someone confirm that a 222 link chain will fit the 6.9 engine.





Some more "fuel" oozed out off the fuel line during last weeks 117 Degree F. weekend.

I hope that the entire tank is not filled with this stuff.





I am also proud to announce that I installed the first new part on the car, a hood release cable.

Thanks
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79 6.9 #6669

oversize

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Re: New forum member attempts 6.9 resurrection
« Reply #22 on: 02 July 2013, 07:06 AM »
I wonder if the tank could be pulled back into shape by a panel beater?  And whether they could do it without further damage, or it springing a leak....

Great idea bench testing the injection system; where did you learn that?  Apparently pressures are critical in getting the engine running as it should....  I'm not sure about repair kits for the WUR but Ken Aires in Melbourne does them and they must get kits from somewhere!  I'd say the injectors are universal but I could be wrong; check the EPC....  Looks like you'll have fun cleaning the rest of the fuel system.   :o

I haven't done a chain yet so I'd like to know too.  Have you looked at the sprockets and guides?  How far out was the timing?
1979 6.9 #5541 (Red Bull)
1978 6.9 #4248 (Skye)
1979 6.9 #3686 (Moby Dick)
1978 6.9 #1776 (Dora)
1977 450SEL #7010 white -P
1975 450SEL #8414 gold -P

polymathman

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Re: New forum member attempts 6.9 resurrection
« Reply #23 on: 02 July 2013, 03:15 PM »
In all honesty, I don't think you will ever get that fuel line clean enough to be dependable. There are so many carefully engineered orifices from the output of the fuel pump to where the injector sprays into the engine, that I think that much of your good work will go waste. One new fuel line won't be that much.
190sl 1957 rusting away
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280SE 1979 running fine
C320 4Matic 2005 for wife -Mercedes after MIT

1960mog

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Re: New forum member attempts 6.9 resurrection
« Reply #24 on: 02 July 2013, 03:51 PM »
Hi

I think I leave the kink in the tank.
It doesn't impair function and a repair attempt could do more damage then good.

The fuel system as you see it in the picture is already cleaned up, it's the part that is left in the car that needs attention.
Pump and filter will be new.
I don't know about the accumulator and damper yet.
The tank will be cleaned and I will install new lines if necessary.

It is maybe a waste of time to do further testing on the injection until I have a working WUR.

How can I get a hold of Ken Aires, a web search came up empty.

I only bought the chain because it was available on ebay.
I didn't open the engine yet to check all the other components.
A chain should be changed at 100000 miles, my car has 128000 miles on the odo, and I don't think that the previous owner took care of it.

Thanks
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79 6.9 #6669

oversize

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1979 6.9 #5541 (Red Bull)
1978 6.9 #4248 (Skye)
1979 6.9 #3686 (Moby Dick)
1978 6.9 #1776 (Dora)
1977 450SEL #7010 white -P
1975 450SEL #8414 gold -P

1960mog

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Re: New forum member attempts 6.9 resurrection
« Reply #26 on: 02 July 2013, 08:36 PM »
Thanks Oversize
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TJ 450

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Re: New forum member attempts 6.9 resurrection
« Reply #27 on: 02 July 2013, 09:26 PM »
I would flush that line by running the fuel pump with fresh fuel in the tank. You should be able to get it reasonably clean, I would imagine. Make sure you have a strainer at the inlet to the fuel distributor, and I can't imagine it would be much of a problem.

I had similar tar oozing out of the fuel lines and tank on my 560SEL, and although it may cause problems, the strainers will catch most of the rubbish you don't flush out.

Some people would want to be more thorough of course.

Tim
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1969 300SEL 6.3 1394
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oversize

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Re: New forum member attempts 6.9 resurrection
« Reply #28 on: 03 July 2013, 04:18 AM »
I'd probably replace any flexible fuel hoses and flush out the rest with a solvent
1979 6.9 #5541 (Red Bull)
1978 6.9 #4248 (Skye)
1979 6.9 #3686 (Moby Dick)
1978 6.9 #1776 (Dora)
1977 450SEL #7010 white -P
1975 450SEL #8414 gold -P

1960mog

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Re: New forum member attempts 6.9 resurrection
« Reply #29 on: 08 July 2013, 07:39 PM »
Bad news

Today I removed the seats and the carped.

Here is what I found.









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79 6.9 #6669