F134 fouling plugs after rebuild

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Re: F134 fouling plugs after rebuild

Post by portajon » Sun Sep 01, 2019 5:13 pm

BTW.... elevation here is about 4,300 feet. Not something I have needed to account for on any of the other equipment here.

Also... I did order a vacuum gauge. Maybe be here Friday if I am lucky. Probably next Monday. Mail is slow to get there.

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Re: F134 fouling plugs after rebuild

Post by Joe Gopan » Tue Sep 03, 2019 6:35 am

Intake Valve Guides and Packings (Seals) are still suspect.
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Re: F134 fouling plugs after rebuild

Post by portajon » Fri Sep 06, 2019 2:30 pm


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Re: F134 fouling plugs after rebuild

Post by portajon » Fri Sep 06, 2019 2:31 pm

Youtube video of engine running here;

https://youtu.be/9aOBRcqX12k

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Re: F134 fouling plugs after rebuild

Post by Joe Gopan » Fri Sep 06, 2019 3:48 pm

Sounds like a little bit of everything going on. Right off the bat I woukd be concerned with crankcase dilution, if it is excessive it could ruin your rings and bearings.
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Re: F134 fouling plugs after rebuild

Post by Scoutpilot » Fri Sep 06, 2019 4:43 pm

definitely running too rich. Do you have a vacuum reading?
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Re: F134 fouling plugs after rebuild

Post by Joe Gopan » Sat Sep 07, 2019 12:58 am

It is obvious that there is a fuel delivery issue, but I woulld also suggust that you also recheck the Oil Pump (timing slot) for proper installation @ TDC, the spark Plug Wires for firing order(1342) and the Timing.
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Re: F134 fouling plugs after rebuild

Post by artificer » Sat Sep 07, 2019 4:08 am

Scoutpilot wrote:
Fri Sep 06, 2019 4:43 pm
Do you have a vacuum reading?
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Re: F134 fouling plugs after rebuild

Post by portajon » Sat Sep 07, 2019 7:23 am

Ben Dover wrote:
Sat Sep 07, 2019 12:58 am
It is obvious that there is a fuel delivery issue, but I woulld also suggust that you also recheck the Oil Pump (timing slot) for proper installation @ TDC, the spark Plug Wires for firing order(1342) and the Timing.
Timing, according to my light, is correct. I did wonder about the oil pump installation, but it times up to the marks fine. Firing order is correct.

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Re: F134 fouling plugs after rebuild

Post by portajon » Sat Sep 07, 2019 7:23 am

artificer wrote:
Sat Sep 07, 2019 4:08 am
Scoutpilot wrote:
Fri Sep 06, 2019 4:43 pm
Do you have a vacuum reading?
I do not have a vacuum reading.

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Re: F134 fouling plugs after rebuild

Post by portajon » Sat Sep 07, 2019 7:25 am

Ben Dover wrote:
Fri Sep 06, 2019 3:48 pm
Sounds like a little bit of everything going on. Right off the bat I woukd be concerned with crankcase dilution, if it is excessive it could ruin your rings and bearings.
Still running the break in oil. Hasn't traveled more than a few miles. Will check it for any presence of fuel.

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Re: F134 fouling plugs after rebuild

Post by jnissen » Sat Sep 07, 2019 8:58 am

Run it without the snorkel tube attached. Verify the choke isn’t closing or not attached properly to the cable. Finally once a vacuum gauge shows up take a reading and then verify fuel pressure with same gauge. They often are dual use. Report back. If the needle isn’t properly pinching off fuel it will dump excess down throat of carb.


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Re: F134 fouling plugs after rebuild

Post by artificer » Sat Sep 07, 2019 2:08 pm

The last post indicating removing the cross over tube is a good suggestion as an overfilled oil bath air cleaner will cause choking/running rich. https://www.militarytrader.com/military ... er_service
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Re: F134 fouling plugs after rebuild

Post by portajon » Sat Sep 07, 2019 2:52 pm

New carburetor and vacuum gauge should be here next week.

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Re: F134 fouling plugs after rebuild

Post by portajon » Sat Sep 07, 2019 2:54 pm

Have run the engine quite Abit with the oil bath out of play. That is eliminated as the culprit.

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