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Question I have may I use CRC QD Electronic Cleaner on a finicky e- unit without damaging it, also what is the difference between the CRC  QD electronic cleaner vs the CRC lectra motive electrical parts cleaner, both state plastic safe, I prefer to not dismantle the e-unit, engine is running fine, every part cleaned, just looking for a fix. Thank You,

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@oldpirate posted:

Question I have may I use CRC QD Electronic Cleaner on a finicky e- unit without damaging it, also what is the difference between the CRC  QD electronic cleaner vs the CRC lectra motive electrical parts cleaner, both state plastic safe, I prefer to not dismantle the e-unit, engine is running fine, every part cleaned, just looking for a fix. Thank You,

Spray away. You can use either of those safely. While you are at it peek at the teeth on the e-unit drum if they are damaged it won't work without replacing it.

I just did this for the first time on the same engine. I simply removed the eunit mounting screw, moved the e-unit off to the side, and gave it a good shot of CRC. I then manually operated the e-unit several times by hand and hit it with a little more CRC. Let it all air dry (only takes a minute) then powered it up. It was slightly sticky at first, but after about a dozen cycles it loosened up and now works flawlessly and cycles quickly.

Last edited by PRRick
@PRRick posted:

I just did this for the first time on the same engine. I simply removed the eunit mounting screw, moved the e-unit off to the side, and gave it a good shot of CRC. I then manually operated the e-unit several times by hand and hit it with a little more CRC. Let it all air dry (only takes a minute) then powered it up. It was slightly sticky at first, but after about a dozen cycles it loosened up and now works flawlessly and cycles quickly.

Yes, I did remove it as you mentioned, will try to give it a shot of cleaner hopefully that would solve the problem,

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@Sitka posted:

How's the fingers look? any burn marks or melting from the fingers on your drum? Good luck those are fine engines have 4. Mark

Mark, everything looks very good, I see no damage to the unit, I did give it a few small blasts of CRC QD electronic cleaner as PRRick suggested, seems like the plunger is smoother, if not I may try some De- Oxit D5 cleaner as it may work a little better. Thank You,Frank

I have a little PW 2037 Adriatic that blew a smoke unit yesterday; looked like a little arc welder going off in there. After I fixed that, she began exhibiting "delayed action" on the e-unit (probably due to all the cursing done during the smoke unit repair; a real PITA). I pulled it (more cursing) and, with the plunger in the "down" position, applied a tiny drop of light mineral oil with a needle oiler on the plunger at the base of the coil. Slid it up and down manually a few times and reinstalled the e-unit. Operation went back to normal subsequently (no more cursing, only .). I suspect this e-unit had been untouched for the 62 or so years this little lady has been around and my "manipulations" removing the smoke unit likely affected the e-unit. She's smoking away and pulling a 14 car 027 freight train around my layout at 22 scale mph at 7.5V on my Z-1000 as I'm typing this. I guess she forgave me for the cursing. Probably the best running "PullMor" loco I've got...

@oldpirate posted:

Question I have may I use CRC QD Electronic Cleaner on a finicky e- unit without damaging it, also what is the difference between the CRC  QD electronic cleaner vs the CRC lectra motive electrical parts cleaner, both state plastic safe, I prefer to not dismantle the e-unit, engine is running fine, every part cleaned, just looking for a fix. Thank You,

They also make CRC with a lube as well. I clean first with the (cleaner) than spray very lightly with the CRC and lube; works all the time.

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