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Military MEP and Aircraft Gen-Sets MEP Mobile Electric Power, APU Auxiliary Power Unit and other military surplus generators.

Military MEP and Aircraft Gen-Sets

Mil-Spec. 2A016-3


ok im stumped!! :confused: my N.O.S. colt 2a016-3 military standard engine has issues, i pulled the...

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  #1  
Old 03-24-2011, 06:10 PM
trowel trowel is offline
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Default Mil-Spec. 2A016-3

ok im stumped!! my N.O.S. colt 2a016-3 military standard engine has issues, i pulled the valve covers and reset the valve lash at .007 inch, checked all the bolts, tuned the carb as best as i can, spent 4 1/2 hr.s slowly breaking it in, and for the life of me, i can not get rid of the miss, it feels like it is the spark, but i changed plugs (.30 inch gap), checked spark, all good this one has the ignition modual on top of the engine, i had another engine do this before (kohler 2-cylinder) but can't remember what i did to fix it?
any help would be much appreciated, here are pic.s of it.
trowel
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Old 03-24-2011, 07:44 PM
Roland Hayes Roland Hayes is offline
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Default Re: Mil-Spec. 2A016-3

First thing I'd do is to put a good quality timing light on it. Mark the tdc notches on the pully with a dab of white paint and check the timing, you can get around the screening on the ht leads by unscrewing the lead from the plugs and inserting pieces of normal ignition lead long enough for the timing light clamp to be attached and tape the pieces of lead in place. At the same time as you are checking the timing, observe the quality of the timing flashes, are they steady on the mark or do they jump around, are the flashes regular or is there intermittent gaps in flashes signifying misfires, if the timing is right and the strobe light flashes are steady and regular then I'd say the problem is mixture, you should now look for air leaks in the induction system. A quick easy ignition test is to close the plug gaps to 0.015" or half the standard gap and see if there is an improvement, if there is, next you must determine whether one or two cylinders are affected by returning one plug to std and trying it again, if its just one cylinder affected you can determine which one like this, let us know the results of these checks
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Old 03-24-2011, 08:06 PM
trowel trowel is offline
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Default Re: Mil-Spec. 2A016-3

i will try gaping one of the plugs to .15 and test each cylinder along with the timing light tomorrow after work, will let you know what happens.
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Old 03-24-2011, 09:58 PM
trowel trowel is offline
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Default Re: Mil-Spec. 2A016-3

i read the manual that came with it, and it is no help, it shows the 2a016-3 with breaker points, nothing about electronic ignition, so i am lost when it comes to adjusting timing the ignition on this engine, i will try setting 1 spark plug at .15 and try at each cylinder,
its time to learn something new, any advice on adjusting timing on this engine would be greatly apreciated, it may not be the problem with this particular engine but i would like to know about it for future engines.
trowel
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Old 03-24-2011, 10:37 PM
coyote62ny coyote62ny is offline
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Default Re: Mil-Spec. 2A016-3

ihave 6 2ao16 engines and im glad all of mine have points the electronic ignition on these engines has been known for problems as i understand from friends that have them you can convert them to points but i think you need a different bearing plate behind the flywheel or mabe you can just change the coils you will also need a governor with the points in it . i have a friends engine here that has a miss we have figured out that it is the moduel on top of the engine im going to convert it to points as we cant find a moduel for it and if you do they will be expensive the engine im working on was new in the crate its had this problem since we first started ityou could also try putting it under a load and see if it runs better it may be that it is still tight and needs to be broke in
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Old 03-24-2011, 10:50 PM
trowel trowel is offline
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Default Re: Mil-Spec. 2A016-3

i ran it under a load and the miss stayed, altho the engine is runing a little better after a slow 4 1/2 hr break-in,
i thought saturn surpluse sold ignition moduals for the 2016-3 ?, i have another one with a bad ignition modual that was on a snowblower

---------- Post added at 10:50 PM ---------- Previous post was at 10:45 PM ----------

saturnsurplus.com, electr. ign. module, $29.50 each
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Old 03-25-2011, 05:49 AM
Roland Hayes Roland Hayes is offline
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Default Re: Mil-Spec. 2A016-3

The quality of the flashes from a strobe type timing light might really tell you if the problem is spark, if the flashes are strong and steady then your ignition is ok, if there is scatter and missing flashes then for sure the problem is spark. The high voltage parts of your ignition system appear to be fully screened by the military spec metal sleeves over the HT leads and the metal casing around the module, these older type electronic ignition systems can be very badly affected by induction from the high voltage into the low voltage wiring, these effects cause voltage eddys in the low voltage wiring that the electronic ignition module see's as spark events, triggering an unwanted spark, there may not be enough coil soak time after one of these bad sparks to restore sufficient energy to the coil to provide a good spark at the correct time for correct ignition, leading to a missfire. Can you have a good look for unscreened low voltage wiring that passes near any unscreened high voltage sources, if you find anything like that try moving the low volt wires away from the high voltage parts as far as possible. Check all electrical connections and clean the terminals with an abrasive to ensure a perfect resistance free connection, even clean looking terminals can have a near invisible layer of oxide etc. that can cause electrical resistance and a volt drop.
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Old 03-25-2011, 09:52 AM
trowel trowel is offline
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Default Re: Mil-Spec. 2A016-3

putting more hr.s on the 2a016 to see what happens, after work i'll see if i can isolate which cylinder is missing, and to move/cover the wires, see if that helps, i'll keep up-dating as i go
trowel
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Old 03-25-2011, 07:37 PM
trowel trowel is offline
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Default Re: Mil-Spec. 2A016-3

progress today, put cardboad between the 2 ignition coils and found that the magneto was rubbing on the magnets bad, i sanded them down, it helped with the miss at 3600 rpm, and no miss at all at 2500 rpm to idle, engine is running stronger now, i found that when i moved the high speed screw the miss whent away for a few seconds, all intake and carb bolts were re-tightened. still waighting for my timing gun back to check timing,
load tests were mixed with or without the miss, sometimes the governer would hunt untill i took off the load, under 3000 rpm load test was fine with no miss or skip,
idle sounds like a fast idle harley davinson engine, it that good??
mounted it on the tiller and tested before it got dark.
total run time, 6 1/4 hr.
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Old 03-25-2011, 07:51 PM
coyote62ny coyote62ny is offline
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Default Re: Mil-Spec. 2A016-3

thanks for the info on saturn will give them a try last time i called they said out of stock looks like one bad a** tiller
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Old 03-25-2011, 08:54 PM
trowel trowel is offline
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Default Re: Mil-Spec. 2A016-3

thank you coyote, i think it is mean looking, engine mounts are temparary untill i make proper ones with rubber, not shure if i should paint it all o.d. with white tines and wheels, or paint the engine red to match the tiller.

oh and needs new dirt sheld, the old ones won't fit now
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Old 03-27-2011, 07:14 PM
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Default Re:help! Mil-Spec. 2A016-3

was runing better, new problem with governer hunting, bad!, cleaned a already sqweaky clean carb. poked all the holes just for the hell of it, adjusted the governer up 5 turns and still hunting like mad, adjust the carb. untill it is running ok (still missing a little) then started tilling and the hunting begines!! i can drown or dry the engine with it hunting sometimes??
high speed screw 3/4 turn out
idle speed screw 1 turn out
odd huh?? it runs ok like that!
what is wrong with this engine??
any help would be greatly appreciated,
trowel
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Old 03-29-2011, 05:41 PM
trowel trowel is offline
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Default Re: Mil-Spec. 2A016-3

ok i got tired of the n.o.s. 2a016-3 engine and switched ignition, mag., and carb., over to the used one with a HUGE change, something is wrong with the n.o.s. # 2 cylinder (p.t.o. side), i will rip into it lator, i made new carb. to manifold gasket last night but never put it in, it needs it, brurps, farts when running, but is smooth under load, new gasket should take care of that, the engine buried the tiller in 6 seconds and did not even bog down!!, i need tine extentions for the tiller now , here are some pic.s of it working the ground and with the dirt shield staged, i will fab. a new fuel tank mount tommorow,
thank you to everyone who helped me get this far, i want to pass this tiller to my nieces and nephews when im done with it, when i rip into the n.o.s. i will ask q.s,
trowel
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Old 03-29-2011, 05:44 PM
trowel trowel is offline
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Default Re: Mil-Spec. 2A016-3

oh and before i forget, the engine is on its new engine mounts,
trowel
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Old 04-07-2011, 07:35 PM
trowel trowel is offline
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Default Re: Mil-Spec. 2A016-3

progress today, trued up the dirt shield, ground the corners down, cleaned and primered it, put rubber on the back of the dirt shield were it rests on the gear box, only 2 frount mounts of the shield will have rubber in them so if the tiller picks up a rock the it will flex/bend, alowing the rock to pass, modified the exhaust pipe closer to the engine and made a bracket for it that bolts to the engine mount, so far so good, but still waighting on a fuel tank
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Old 04-07-2011, 09:49 PM
trowel trowel is offline
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Default Re: Mil-Spec. 2A016-3

i gess no one is interested in the progress of my modified tiller, i'll stop posting on this page,
thanks you to the people who helped me figure out what was wrong with the n.o.s. 2a016-3 engine,
trowel
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Old 04-07-2011, 10:06 PM
Lloyd H Lloyd H is offline
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Default Re: Mil-Spec. 2A016-3

Quietly waiting for next installment
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Old 04-07-2011, 10:29 PM
trowel trowel is offline
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Default Re: Mil-Spec. 2A016-3

ok, i'll keep posting here,
trowel
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Old 04-07-2011, 10:30 PM
RETCPO RETCPO is offline
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Default Re: Mil-Spec. 2A016-3

With over 300 views I believe this thread is more like the Harry Potter movies… Everyone is waiting just like Lloyd…Quietly waiting…
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Old 04-08-2011, 05:37 PM
trowel trowel is offline
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Default Re: Mil-Spec. 2A016-3

as promised,
made a wire arm guard for the exhaust pipe, can't pull start from the other side due to the air filter being in the way, wire is straighted bed springs, not the straighest wire to work with, but it was there, good hard steel, few minutes on the anvil, bent in the post vice, should work,
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