Ambac M-50 Rebuild w/ pics (MEP-003A)

[Kkkpack]

This was all the tech data I could find.

	CROSS-SECTIONAL HEIGHT	0 1/8 INCHES NOMINAL
	MATERIAL	RUBBER

Thank you
I went to the hydraulic shop, they keep a large assortment of orings.
They came up with number 230 for a match up.
I’ll measure it and try it and then we’ll have an alternative.

 

[TurboStreetCar]

Hello, it seems i have a fuel leak from the throttle control rod of the pump on my 002a.

I read somewhere that the control mechanism isn't supposed to be serviceable, but you can use a welder to take it apart.

Is there a simple o-ring that can be replaced on the control shaft that doesn't require breaking the assembly down? Or is the o-ring that seals it internal to the mechanism, and would require disassembly?

 

[jamawieb]

Hello, it seems i have a fuel leak from the throttle control rod of the pump on my 002a.

I read somewhere that the control mechanism isn't supposed to be serviceable, but you can use a welder to take it apart.

Is there a simple o-ring that can be replaced on the control shaft that doesn't require breaking the assembly down? Or is the o-ring that seals it internal to the mechanism, and would require disassembly?

It is an oring. You pull the throttle linkage out and replace the small oring. It can sometimes be a pain to get it aligned correctly with reassembly.

 

[Guyfang]

Hello, it seems i have a fuel leak from the throttle control rod of the pump on my 002a.

I read somewhere that the control mechanism isn't supposed to be serviceable, but you can use a welder to take it apart.

Is there a simple o-ring that can be replaced on the control shaft that doesn't require breaking the assembly down? Or is the o-ring that seals it internal to the mechanism, and would require disassembly?

Where did you read that its not serviceable? Simply not true. And a welder? I would like to see this. What you should do is start a thread in the generator form, and get some good information.

 

[TurboStreetCar]

Where did you read that its not serviceable? Simply not true. And a welder? I would like to see this. What you should do is start a thread in the generator form, and get some good information.

Was in this thread: https://www.steelsoldiers.com/threads/mep-002a-injection-pump-disassembly-repair.199226/

Post #5

"....The throttle assembly is tack welded closed and not meant to be serviced, just replaced, but if you have a tig or mig welder it can be opened up, replace the internal o-ring and tack it shut again, but if not leaking just leave it be....."

Seems ill have to pull the pump to fix the leak, so i kinda feel like i should replace any seals gaskets while im in there, But also dont want to open a can of worms. Generator runs fine as is, Just noticed the fuel leak when doing an oil change.

 

[Ray70]

Hold on a second folks.... He is correct, the throttle control is considered non-serviceable but can indeed be fixed with a welder!
So, the assembly ( which can still be purchased if you can find it ) CU4514A has an internal o-ring which is the one that usually leaks, because that is the one that is actively sealing the moving throttle shaft.
The other o-ring around the outside is static and almost NEVER fails.
If you want to try to fix your existing control unit, grind the small tack weld off that secures the outer lever to the center shaft, this will allow you to separate the inner shaft from the outer tube.
there's an o-ring in the inner shaft, that's the one that is prone to leaking over time.

 

[TurboStreetCar]

Hold on a second folks.... He is correct, the throttle control is considered non-serviceable but can indeed be fixed with a welder!
So, the assembly ( which can still be purchased if you can find it ) CU4514A has an internal o-ring which is the one that usually leaks, because that is the one that is actively sealing the moving throttle shaft.
The other o-ring around the outside is static and almost NEVER fails.
If you want to try to fix your existing control unit, grind the small tack weld off that secures the outer lever to the center shaft, this will allow you to separate the inner shaft from the outer tube.
there's an o-ring in the inner shaft, that's the one that is prone to leaking over time.

Is the GA 1085 O-ring the internal oring? Or is that the static external one youre reffering to?



I do CNC machine work and fabrication on the side, so tack welding the lever to the shaft shouldnt be an issue.

Just want to have all the parts ready for when i pull the pump.

Very appreciative to this forum, The quick responses bring my back to the late 2000's when car forums were in full swing!

 

[Ray70]

GA 1085 is the external one. They don't list the internal because it's part of CU8514A
You'll have to separate the 2 halves of the assy. and see what size o-ring fits in there correctly.
If you have any trouble finding one locally I often use:

Simriz® FFKM Perfluoroelastomer O-Rings for Extreme Heat and Aggressive Chemicals

Experience unwavering resistance to extreme heat and aggressive chemicals. Simriz® FFKM perfluoroelastomer O-Rings at The O-Ring Store LLC. Our battle-tested O-Ring solutions offer unparalleled resilience against extreme heat and aggressive chemicals. Born from the fire of our hard-fought...

www.theoringstore.com

Open it up, replace the o-ring and tack it back together.
BUT, better yet, check this out!

AMERICAN BOSCH - AMBAC Lever Assy CU8514A 2910-01-031-9441 2910010319441 (0043) | eBay

STEEL, THREE PIECE ASSEMBLED UNIT OF LEVER AND SHAFT W/SLEEVE, 0.500 IN. SLEEVE OD, ONE END OF LEVER W/PAWL POINT, OTHER END W/0.195 IN. DIA CONNECTING LINK PIN HOLE, 2.270 IN.

www.ebay.com

 

[TurboStreetCar]

Oh wow good find.

Would that require any adjustment for my specific pump? Or would that be a drop in replacement?

 

[Ray70]

Just drop it in and go! Only thing is you have to remove the IP to swap the control unit so make sure you set the engine on the #1 compression stroke's PC mark, remove the IP with a 1/8" drill bit inserted into the side hole, then reinstall in reverse after swapping the control unit.
Nothing else to adjust to anything, as long as you follow the TM directions on removing and installing the IP.

 

[TurboStreetCar]

Awesome, appreciate the help. I picked one of those up, but ill prolly keep mine to fix and have as a spare. Much appreciated!