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Old 09-16-2013, 12:35 AM   #1
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Pulling Injectors on a Lehman120

Has anyone ever pulled their injectors? Any issues to consider? Do you need the special tool? I'm thinking about servicing mine before headed south in a month.
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Old 09-16-2013, 07:00 AM   #2
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When mine were pulled a couple years back (I assisted a mechanic because the Lehman was new to me)..

No special tools..there are crush washers used under the return line banjo bolts so get those from someplace...sorry I don't have a size so for a reasonable price American Diesel isn't ripping you off and saves the searching.

I asked in another thread but didn't get a reply....when we did it, the mech thought we had to and removed the rocker arm. I thought that was crazy but to get to the injectors he saw it as they way...maybe that's where a special tool comes in...but it can be done without one. After removing and replacing the rocker arm, we adjusted the valves to a Lehman 135 specs due to a mixup from the previous owner telling me that's what the engine was.

It ran fine from Ft Lauderdale to NJ and for a year till when ordering parts from American Diesel they started to wonder and a reference to some other part numbers and they convinced themselves and me that I really had a 120. So in talking to them...they say it was probably OK that I had used the 135 valve clearances than had it been a 135 and used 120 valve clearances...I redid the clearances...pretty easy/simple job...but being a single I have plenty of room to work.
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Old 09-16-2013, 09:42 AM   #3
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I have to do this to my twins. Can you post pictures and a how to? I'd appreciate it. I have lots of tools and I bought a socket for the crank nut to turn the engine over. Just haven't had the urge to "get 'er done".
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Old 09-17-2013, 12:46 AM   #4
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Its easy, Stretch, no special tools, don't take off the rocker arms, you can anneal the copper washers and re-use them. Take the injectors to a farm shop, same injectors as used on some combines and tractors; don't take them to a "marine" specialist and pay double. Good time to check the cyl head torque and re-set the valves (if memory serves the engine has to be operating temperature?). If you haven't done this for a while the rubber seals on the side of the head might be stiff or brittle, but they should be easy to replace if they are. They don't have to be too tight.
When I put my new injectors in, I didn't need to bleed them, the old dear just started right up. i did undo each injector in sequence to make sure they were all working (I did find one injector that was dead after servicing!) and then I put the valve cover back. She's even noisier with the valve cover off, don't forget ear protection and some sort of goggles for the oil.
Be very gentle with the fuel pipes as they are expensive and a bit rare.
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Old 09-17-2013, 08:53 AM   #5
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THANK YOU!! Just a shout out to you.

I'll tackle this in the winter months after my deck replacement.
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Old 09-17-2013, 04:42 PM   #6
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XsBank do you have a 120 lehman ?



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Old 09-17-2013, 07:09 PM   #7
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I did, I had to sell my lovely GB32 because I had to move for a job and now I'm back on the Wet Coast and I'm looking for her replacement. Not necessarily a GB.
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Old 09-17-2013, 07:24 PM   #8
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XsBank thanks for the tip about the injectors found at farm equipment stores. I'll check then out.

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Old 09-17-2013, 11:57 PM   #9
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Much easier to pull the injectors if you unbolt the entire rocker shaft and get it out of the way.
American Diesel has all the parts including copper injector seals, copper fuel return line (leak-off) seals, and rubber injector seals. They can provide exchange injectors so you can pull the old ones, install the new ones with all new seals, and just send the removed injectors back.
Yes, you can anneal the copper seals but I don't think it's worth it.
Yes, I have pulled the injectors. Not a bad job, no special tools except a torque wrench. Give yourself a day for the first engine.
After you reinstall the rocker shaft do a cold valve adjustment, then start the engine, warm it up and do a warm valve adjustment.
PM me with a phone or email if you have questions.
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Old 09-26-2013, 07:32 PM   #10
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Quote:
Originally Posted by av8r View Post
Much easier to pull the injectors if you unbolt the entire rocker shaft and get it out of the way.
American Diesel has all the parts including copper injector seals, copper fuel return line (leak-off) seals, and rubber injector seals. They can provide exchange injectors so you can pull the old ones, install the new ones with all new seals, and just send the removed injectors back.
Yes, you can anneal the copper seals but I don't think it's worth it.
Yes, I have pulled the injectors. Not a bad job, no special tools except a torque wrench. Give yourself a day for the first engine.
After you reinstall the rocker shaft do a cold valve adjustment, then start the engine, warm it up and do a warm valve adjustment.
PM me with a phone or email if you have questions.
Do you know the torque specifications for a Ford Lehman? I can probably look them up somewhere, but curious.
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Old 09-26-2013, 07:55 PM   #11
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still wondering why some remove the rocker assembly and some don't...
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Old 09-26-2013, 11:01 PM   #12
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Old 09-26-2013, 11:18 PM   #13
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still wondering why some remove the rocker assembly and some don't...
It takes only a few minutes to unbolt and remove the rocker shaft. Then you have easy access to the leak-off tube bolts, it is easy to remove the leak-off tube itself, and then you have wide-open access to the injector bolts and injectors for removal and reinstallation.
After reinstalling the injectors and leak-off tube it only takes a few minutes more to reinstall the rocker shaft, and if it's time to do injectors it is also probably time to do a valve adjust anyway.
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Old 09-27-2013, 06:48 AM   #14
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It takes only a few minutes to unbolt and remove the rocker shaft. Then you have easy access to the leak-off tube bolts, it is easy to remove the leak-off tube itself, and then you have wide-open access to the injector bolts and injectors for removal and reinstallation.
After reinstalling the injectors and leak-off tube it only takes a few minutes more to reinstall the rocker shaft, and if it's time to do injectors it is also probably time to do a valve adjust anyway.
the time I needed a mech to help...that's what he suggested/did...just not sure why it was recommended "don't remove all that"...
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Old 09-27-2013, 06:56 AM   #15
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Excellent. Thank you.
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