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1. 11:57 AM - Re: 914 rough running (Jerry Rehn)
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| Subject: | Re: 914 rough running |
Bud
After about 4 tries the oring has an even fit!
Sent from my iPad
On May 17, 2013, at 8:08 PM, Jerry Rehn <rehn@rockisland.com> wrote:
> Bud
> I have the new float chambers and new orings for the retraining nut and no
w see the oring wants to buldge out a bit on torquing down. I assume the new
revised bolt has provisions for the oring that the current bolt does not. Y
ou indicated that yours worked ok. I am hoping to not have to purchase the n
ew bolts at about $80 each!
> But I am not happy with the oring not fitting perfectly. I see you left th
e old washers in place as well, I don't see how that will keep the oring fro
m pressing out. I torqued down to only 46 inch. I didn't lube them, thought t
his would make it worse? Tomorrow I will try some lube but welcome any other
suggestions.
> Thanks
> Regards
> Jerry
>
> Sent from my iPad
>
> On May 6, 2013, at 2:41 PM, "Bud Yerly" <budyerly@msn.com> wrote:
>
>> Jerry,
>> Please note that the 914 is a bugger to troubleshoot, and all the advice s
o far is notable and spot on.
>>
>> Since the engine has two problems: (1) Rough after pulling it back and (2
) TCU Caution light, I will deal with 2 first...
>>
>> 2. The caution light is most probably your throttle pot is not hooked up
electrically or the pot was not set to idle with the throttle plate closed s
o check your connections and pot rotation after doing the carb. Easy mistak
e, especially since the book doesn't cover it. If not set properly, the TCU
gets the wrong throttle position for the Turbo boost and pressure sensors.
>>
>> 1. With you having the same hours I have on my engine, I have noticed th
at with all the tubing and carb float bowl items operating properly and no f
uel leaks, the engine on power reduction runs very rough but idles well and r
uns well above 4000 RPM. I suspect yours is similar.
>>
>> It is not uncommon that one of the carb pistons is hanging up. Once the p
iston goes up on full throttle, one doesn't want to come down. I removed th
e carburetors again. I completely drained and freed both my carbs of fuel t
o prevent an explosion. I rigged my vacuum cleaner and pulled air from the m
anifold side and noted the movement of the piston. On the left carb it was c
learly hanging up. After much cleaning, sanding with 1000 and 1500 grit pap
er, polishing and more cleaning, the piston is acceptable in its movement an
d smoothness. If your carb pistons move smoothly and in unison (checked by n
oting the throttle angle vs piston position) then that should make the carbs
balance in the mid range. If the main carb body is worn or scored badly, s
ome small grit has gotten into the carb and I am afraid you can save a lot o
f time and trouble by buying two new carbs. By the way, that is about the p
rice of a small car down payment.
>>
>> To Bob Borgers comment, I have found that leaving the float bowl gasket i
n place and adding the new extra O ring (with a bit of lube) allows me to in
stall the original float bowl attachment screw and I torque it to 48 inch po
unds. Be sure to soak your paper gasket in fuel for a few minutes. Note th
at the old manual said 5.5 nm or 45 foot pounds. Obviously 45 foot pounds i
s going to seriously bend the bottom of the carb bowl and the pins. Luckily
, a quick $100 per float bowl will fix that. I have found that it necessary
to pay attention to the translation and conversions in the old manual. The
new manual has the torque hidden in the verbage so well that I had to post i
t to my board in the shop. Please pay close attention to your brass float p
ins and the float bowl. Also make sure your float needle valve and arms are
undamaged.
>>
>> I have been very disappointed in the fit of the new carb parts such as th
e needle fixation screw with the O ring. It sucks.
>>
>> I hope your carbs just need a little tender love and care and not replace
ment. I am at my last straw with my 1/3 side carb, so I may be spending som
e big bucks.
>>
>> Regards,
>> Bud Yerly
>>
>>
>> ----- Original Message -----
>> From: Jerry Rehn
>> To: europa-list@matronics.com
>> Sent: Sunday, May 05, 2013 3:43 PM
>> Subject: Europa-List: 914 rough running
>>
>> A little history. Engine has about 450 hours, always ran quite well, repl
aced upper ignition module about two years ago.
>> On recent full boost takeoff, got to about 900 feet leveled off, pulled t
hrottle back and engine ran severe rough, pulled back to idle and engine ran
ok, didn't stop! Landed. Checked fuel filter, ok, looked for anything aroun
d carbs, nothing. Tried several full run ups, ok. Tried second take off ever
ything fine, pulled back and again engine ran severe rough, pulled back to i
dle, ran rough, landed. Parked plane, got tools, next day removed carbs look
ed for issues. Found one of the four screws that holds down the rubber diaph
ragm loose, very strange because I have never removed this before. Anyway fi
gured this was my problem. Fixed took off all ok. Got home. Next day tried f
ull boost, same issue again, didn't take off. Got carburetor repair kit and w
ent through both carbs. Reinstalled carbs double checked. Started right up, a
s I move the throttle past 2300 rpm the yellow caution light starts blinking
, engine runs rough, reduce rpm the light goes off, increase the light comes
back on. Seems the engine runs off the idle jet ok but not on the main jet.
>> I have also checked the waste gate for proper function, fuel pressure ok,
turbo lights come on and go off as they should when master is tuned on, I h
ave looked at the vent lines. The yellow blinking light can indicate a senso
r failure, seems like it would continue blinking if there was a failure. See
ms odd that it stops at low rpm. Seems I have some kind of a vacuum or press
ure issue, but am running out of ideas. I am about to go and recheck again! C
ould a faulty sensor cause this?
>> Hope someone out there has some wise thoughts on this frustrating problem
. Worse yet, we have beautiful spring flying weather!
>> Thanks for help.
>> Jerry
>> 914 Mono XS
>>
>>
>> href="http://www.matronics.com/Navigator?Europa-List">http://www.matron
href="http://forums.matronics.com">http://forums.matronics.com
>> href="http://www.matronics.com/contribution">http://www.matronics.com/c
>>
>>
>>
>
>
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>
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