eisman overhaul book

[jgerard]

Has anyone seen, or used the Eisman overhaul book that Fresno Airparts sells. I need to go through my mags (LA4) and would like some reference material. I have a parts breakdown and thats it.

Who is selling new shielded harnesses for these old Eisman mags?
Not Fresno!

Jason
N43643

[alwaysoar]

Re: eisman overhaul book

Jason, I bought one from Fresno. It gives a step by step. At the price it's not too bad a deal. I don't know where to get shielded harnass--I have the AM-4's that don't take a shielded harnasss

[Dick Smith]

Re: Eisemann shielded leads

Jason, I had Arn-Air build me a set of shielded ignition leads. They also rebuilt my Eisemann LA-4 mags. Been very satisfied. Dick
Arn-Air
P.O. Box 148
405 Main St.
Bayard, Iowa 50029
Ph. 712-651-2255

[alwaysoar]

Re: eisman overhaul book

Dick--What did they charge for an overhaul?

[Dick Smith]

Re: Eisemann overhaul cost

Give me some time to go through some receipts...I'm in Anchorage, planning to attend Seaplane Safety Seminar on Sat. Will be away from a huge stack of receipts for a couple of days. Jim Hartley and I flew from Kenai, up to Eagle River(Birchwood Airport) today...we could see for hundreds of miles...Mt. McKinley(Denali)...the Alaska range...Chugach Range...Kenai Mtns...what a sight! Dick

[Yellow Duck]

Re: eisman overhaul book

I have a good Eisman Mag with impluse Coupling I will be removing from my T-Craft. Installing two new Slicks.

I don't know what a fair price would be ? So make me an offer if interested.

[Dick Smith]

Re: Eisemann overhaul

I couldn't find the receipt from Arn-Air, but my notes from when I initially spoke to him show: Eisemann LA4 $260 for new bearings, Points, Condensor, seal gaskets, Springs and Distributor Cap...extra if required for Coils/blocks/rotor/gears. I sent him my old shielded harnesses and he matched them with new. Don't recall the cost of the new harness, but it didn't cause a heart attack when I paid it! Hope this helps. Dick

[alwaysoar]

Re: eisman overhaul book

Thanks Dick--That does help.

[flyguy]

Re: eisman overhaul book

Dick,
Do you have any ignition noise problems with your eisemann mags? I've gone thru all the standard stuff, and they are still noisy. Great mags, but what a racket in the radio.
It isn't the p-leads, and I have new plug leads--didn't make ANY difference.
My present suspicion is that there should be grounding gaskets (metalic) between the sections of the mags and that they are just plain insulating type.
That would break up the shielding continuity.
Any info for me?
Harnesses for the eisemanns are available via Aircraft Spruce, but I don't recomment them as they don't seat very well on the mag connectors. (I know, but I think that isn't the main problem)
Thanks for the supplier information, I may contact them and see what they say.
Darryl

[Dick Smith]

Re: Ignition noise

Darryl, are your P-lead shields grounded at both ends? Have you read this link? You might discuss it with your mech/AI. http://members.eaa.org/home/homebuil...o%20Noise.html Dick

[Len Petterson]

Re: Ignition noise

Darryl, are your P-lead shields grounded at both ends? Have you read this link? You might discuss it with your mech/AI. http://members.eaa.org/home/homebuil...o%20Noise.html Dick

A shield, no matter where it is shall never be grounded in both ends!
What I was tougth in electronics i college, but plugg wires are grounded in both ends. or are they grounded in the mags?
If the shield is grounded in both ends it becomes a lead and will carry a current, wich causes disturbence, noise.
My p leads are shielded with grounding at the mags only.
Grounding is generaly dune at the source. mag. radio etc.
Len

[Dick Smith]

Re: grounding shield on p lead

Len, this may clarify the statement about "grounding" at both ends:
http://www.copilotconsulting.com/mai.../msg19525.html Again, this is for discussion purposes between you and your mech./AI Dick

[flyguy]

Re: eisman overhaul book

Dick,
I guess I didn't quite phrase my question correctly.
Are your Eisemann mags quiet, refering to radio noise?

General discussion:
The reason the plug wires are grounded at both ends is they form a part of a continously enclosed shielded system. Like a chassis box on a piece of electronic equipment. Whereas the P leads are open ended (the center conductor is not enclosed at the panel,) and work better with only one ground, as with any "pigtailed" lead.
Again I THINK my problem is these particular mags were not set up origninally to be quiet and there is probably no electrical continuity between the outside case sections, most likely due to insulating gaskets. I'll check with the mag guys at the number Dick referenced.
Except for saying "it's your p-leads," most AI's don't have a clue. (that is my experience, for what it's worth.)
Darryl

[Dick Smith]

Re: Eisemann mags re:noise

Darryl, So far I've been quite satisfied with the Eisemann mag as regards noise. I can adjust the squelch on the JRC handheld, which is connected to co-ax leading to a fibreglas whip, and not contend with objectional racket. I can hear the characteristic static noise underlying conversation, but it's definitely in the background. Jim Hartley and I compared radio transmissions last week and were quite satisfied with both transmission and reception.
Dick

[flyguy]

Re: eisman overhaul book

Thanks Dick,
I know my P-leads are quiet(I took them off once,) so I'm going to try to get the new plug leads to function better then check out the mag case RF continuity. I'll call your mag guys to see if my ideas about the conductive gaskets might be correct.
Thanks again,
Darryl