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Reading a post in the 601 forum, it refers to fitting an insulating washer under the ignition coils to reduce heat transfer. It seems to be specific to the Glossy Black coils of earlier engines but I wonder if it is also recommended for the matt black ones of later production? The document I refer to is:
Jabiru Engine Service Bulletin
Subject: Ignition Coils
Applicable: Jabiru 2200 S/No. 22A1292 to 22A1528
Jabiru 3300 S/No. 22A0360 to 22A0536
Compliance: Before Next Flight
Date: 3rd September 2003 Ref: UKJSB004
Revision: 2 Dated 9th September 2003
Ignition Coils - Glossy Black Coils marked "LEADING GX"
We have been monitoring a problem with ignition coils fitted to recent Jabiru engines, we have seen tell tail signs of break down leading to either a misfire, failure or call to ourselves for advice. The tell tale signs are: hard to start, ignition noise on RT, missing at high load typically in the climb or eventually complete failure at Mag Check.
The original GREY coils P/N P10522N have never given problems with over 600 coils in service in the UK and only 1-2 failures since 1996.
Our supplier stopped producing this coil and Jabiru sourced another coil P/N P10523N, it can be identified by a gloss black casing and text "LEADING GC'. Some of these coils have been breaking down on high usage aircraft, as well as a couple of moderate usage.
The engines fitted with these coils are:
22A1292 to 22A1528
33A0360 to 33A0536
Grey coils are considered good.
Matt Black coils P/N P10524N with a rectangular projection on the side and marked TEK (looks like TEC) JAPAN FL833 are considered good.
All new engines from S/N 1529 (2200) and 537 (3300) use TEK coils.
If your engine is within this serial number range or you have a glossy black coil fitted :
the fibre washers were fitted at factory after 2003.
the coils have changed a couple more times since the article, I beleive the cooling tube recommendation is still current
it was really invented to fix the faulty brand coils
Thanks for sharing. You should also post this info to the thread on the 601/650 forum where they are discussing the accident. It is certainly a good warning for all of us. When it comes to aircraft, you want only the best, most proven parts installed. Saving a few bucks can cost you your life. In addition to the coil issues, I've also heard of builders having problems with off-brand distributor caps cracking... another thing to be wary of.
I spoke with the fine people in Shelbyville, TN, Nick at Arion Aircraft, about the magnetos. He mentioned they think the Honda mags are likely better than the Jabiru mags made in China. He also said reading the resistances can be tricky and are probably ok if they're near the specification range and especially not ground. I have the Honda mags and decided to stay with them since I only needed to replace the modified piggyback connector that cracked (which in my case slips onto the mag's tab) and I think was the cause of my mag not firing and misfiring intermittently recently.
If I had Jabiru mags I would also comply with the above SB. I hope this information helps us.
Blue skies and God bless,
The plane ran good today. Regarding the Honda mag discussion, I wanted to add I don't know if Honda has improved its mag / coils over the years.