Jab 3300 runs on 5 cylinders after standing for a week

The Jabiru Engine which is used in many other aircraft.

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JontyL
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Jab 3300 runs on 5 cylinders after standing for a week

Unread post by JontyL » Sun Aug 27, 2017 9:40 am

Any body know what would cause my jab 3300's cylinder no:5 to not fire when started after a weeks rest. If revs increased to 1700 rpm no:5 egt comes alive and runs normally. Then runs normally for that flight. The issue returns after the next weeks rest. Not related to the mags. I thought it might be sticky valves. Has anyone had a similar problem. What's the solution?
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Re: Jab 3300 runs on 5 cylinders after standing for a week

Unread post by Induna » Sun Aug 27, 2017 5:35 pm

Hi,

could it be that the mixture is running rich on your engine in that particular cylinder and that its plug fouling that causes this?

I know the Jabi has got a single Bing carb which is partially altitude compensating and without a mixture control, but could it be that it is running very rich for some reason?

Are you flying avgas or mogas?

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Re: Jab 3300 runs on 5 cylinders after standing for a week

Unread post by lessersg » Sun Aug 27, 2017 6:15 pm

Could be a sticky valve. I would eliminate plugs and leads first . Could be moisture in the dizzy , remove and clean . If all else fails do a blow by on that cylinder
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Re: Jab 3300 runs on 5 cylinders after standing for a week

Unread post by JontyL » Sun Aug 27, 2017 6:55 pm

Thanks will check those items.
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Re: Jab 3300 runs on 5 cylinders after standing for a week

Unread post by Aerosan » Mon Oct 02, 2017 6:34 am

Hi JontyL

I have the exact same problem, same cylinder etc.

Have you found a solution?

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Re: Jab 3300 runs on 5 cylinders after standing for a week

Unread post by JontyL » Mon Oct 02, 2017 4:20 pm

Hi Aerosan.
Was told it was a sticky hydraulic lifter and It should correct itself. The day I took it for a blow by test It was gone and fixed itself. Hasn't happened again. Blowbys are all 100%
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Marius Schrenk
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Re: Jab 3300 runs on 5 cylinders after standing for a week

Unread post by Marius Schrenk » Mon Oct 02, 2017 6:26 pm

Double transmission :oops:
Last edited by Marius Schrenk on Tue Dec 19, 2017 5:19 pm, edited 1 time in total.
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Re: Jab 3300 runs on 5 cylinders after standing for a week

Unread post by Marius Schrenk » Tue Dec 19, 2017 5:18 pm

Marius Schrenk wrote:
JontyL wrote:Hi Aerosan.
Was told it was a sticky hydraulic lifter and It should correct itself. The day I took it for a blow by test It was gone and fixed itself. Hasn't happened again. Blowbys are all 100%
and the vibration is it still there?......we had something similar.....Dave said it might be a hydraulic lifter....turned out to be just that. :D
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