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Tim Juhl
Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan
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 Posted: Tue Aug 13, 2013 10:25 am Post subject: Jabiru 3300 Modifications? |
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I have an early hydraulic lifter 3300, still in the plastic, which I hope to install on my Zenith 601 soon. I understand that a few changes have been made since mine was built and wonder whether I need to consider incorporating any of those changes prior to hanging the engine. I discussed it briefly with Pete Krotje at Oshkosh, who suggested that barring evidence to the contrary, I needn't do anything at this time. The two major items were:
Thru-bolts: They are now using longer bolts with special nuts. Pete said that the bolt problem was pretty much restricted to a small number of flight school 4-cylinder Jabs and to his knowledge, had not been a problem with the 3300. Has that been your experience?
Hydraulic Lifters: The early lifters would sometimes hold the valves open a bit longer, evidenced by cooking some of the oil visible under the valve covers. Has anyone observed this problem and been able to cure it by changing the lifters?
Any other recommendations are always welcome.
Tim
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Champ L16A flying
Zodiac XL - Jabiru 3300A
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plus2s
Joined: 30 Nov 2006
Posts: 65
Location: NEW ZEALAND
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| Posted: Tue Aug 13, 2013 4:15 pm Post subject: Jabiru 3300 Modifications? |
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Hi Tim
There were certainly some problems with the early 4 cyl engines mainly by having too lean jets and needle, I would certainly check yours. The other thing with the early Hydraulic engines is they used the solid lifter cam and when the revised lifters came out the cam was also changed. Since then Piston to barrel clearance has been increased and ring groove clearance increased, also ring type has changed. If you do any mods to your engine it is worth changing the nuts on the through bolts to the new ones, they are so much easier to work with. Just another thought is to make sure you keep the cylinders well oiled while it is in storage.
all the best with your project
Regards Keith
From: Tim Juhl <timjuhl(at)frontier.com>
To: jabiruengine-list(at)matronics.com
Sent: Wednesday, 14 August 2013 6:25 AM
Subject: Jabiru 3300 Modifications?
--> JabiruEngine-List message posted by: "Tim Juhl" <timjuhl(at)frontier.com (timjuhl(at)frontier.com)>
I have an early hydraulic lifter 3300, still in the plastic, which I hope to install on my Zenith 601 soon. I understand that a few changes have been made since mine was built and wonder whether I need to consider incorporating any of those changes prior to hanging the engine. I discussed it briefly with Pete Krotje at Oshkosh, who suggested that barring evidence to the contrary, I needn't do anything at this time. The two major items were:
Thru-bolts: They are now using longer bolts with special nuts. Pete said that the bolt problem was pretty much restricted to a small number of flight school 4-cylinder Jabs and to his knowledge, had not been a problem with the 3300. Has that been your experience?
Hydraulic Lifters: The early lifters would sometimes hold the valves open a bit longer, evidenced by cooking some of the oil visible under the valve covers. Has anyone observed this problem and been able to cure it by changing the lifters?
Any other recommendations are always welcome.
Tim
--------
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Wing modifications done - back working on the fuselage
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