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Jabiru Aircraft
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Thread transferred May 2018

oil leaks

2200 oil leaks    1 year 11 months ago#252

·         john keena

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Hi Doug
Just had some oil leaks on 2200 600 hours just had 100 service this is first time to happen I Ground ran engine for a few minutes at 2000 rpm no sign of where it is coming from but yet drops still continue to fall from cowl

My engine ser 2322 2006 which had to be vented with 4 holes in cam chamber would this cause oil to leak out I wait your comments regards john

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2200 oil leaks1 year 11 months ago#253

·         Doug Smith

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Hi John,
It's not unheard-of for the vented heads to let some oil out but it's unusual. If the issue has only happened after the recent service it's most likely something that was worked on (assuming the vents weren't drilled during this maintenance). It'd be worth checking that the access screws for the bottom cylinder head screws are all in place for example.
Regards,
Doug.

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2200 oil leaks1 year 11 months ago#256

·         john keena

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Thanks for your reply will check this ! With regard to s/b JSB031-1 OR 2-OR3 I have not yet done [1] s/b As my aircraft is a private aircraft from new and is never used for flight training was not sure if this s/b apply to my aircraft engine with 600 hours oil temp 80D BAR 4 CHT 130 ECT 670 e no 2322 3/8 bolts ? Could this be the reason for oil leak ? Look forward to your comments Thanks John

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2200 oil leaks1 year 11 months ago#258

·         Doug Smith

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No problem John,
If you've had a through bolt failure it's usually pretty obvious. Even if the nut on the broken bolt is still in place there will be oil and black deposits at the base of the cylinder from where it's been moving. Your numbers seem good though so chances are that's not the problem.
Regards,
Doug.

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2200 oil leaks1 year 11 months ago#260

·         James Sneddon

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Regarding vent holes drilled according to JSB 013-1 dated 8/8/2006.

I am sure a number of engines have been modified per Jabiru SB's and engine manuals and now fly not only with JSB 013-1completed but also with hollow push rods. Does such a combination pass muster with you folks? Have any issues been reported with this setup?

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2200 oil leaks1 year 11 months ago#263

·         Doug Smith

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Hi James,
Provided they changed the lifters for a new set with the correct flow rate at the same time there shouldn't be an issue.
Regards,
Doug.

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TOPIC: 2200 oil leaks

2200 oil leaks1 year 11 months ago#267

·         James Sneddon

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Doug, please be more specific regarding a new set of lifters with "the correct flow rate" in your response. I'm not familiar with a production change on the lifters. Can you offer a reference by date of change and part number. Thanks for you quick response.
Jim.

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2200 oil leaks1 year 10 months ago#284

·         Doug Smith

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Hi James,
Sorry for the delay, it's been crazy busy lately.

In general if there's a problem along those lines it'll be pretty self-evident: There will be leakage out those vents. Unfortunately I can't give you hard dates or numbers on this one, sorry.

Regards,
Doug.


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cloutaa
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Oil leaks in general but particularly the fuel pump.

I have had similar symptoms with my 3300 (Sonex) and I have just changed the fuel pump gaskets. BUT when I did , on close inspection

it really did not look like it was leaking. While I was under there I also noticed oil on my push rod tubes (only the aft 2 cylinders)

after cleaning it all off and desperately trying to find where it was coming from. Then the penny dropped , it was coming from between

cylinders 1 and 3. Guess what is above cylinder 1 and 3. The oil filler tube. Yes I had spilled a little bit now and again while putting oil

into the engine , it runs down between cylinder 1 and 3 gets blown back into the push rod tubes and all over the fuel pump.

I have spoken to a few owners who have (Like me) replaced their fuel pump gaskets so I am writing this to defend the humble fuel pump.

Before you do anything make sure the oil you find is not the result of spillage during a top up process.


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Doug Smith
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And a little oil goes a long way when you spill it!

D.


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Olav Soendergaard Poulsen
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My engine is leaking small amount of oil from the area where the oil dipstick tube is attached to the sump. I am pretty sure the leak is not comming from between the block and the sump. But is difficult to detect. The oil moves backwards in the same as described giving the area around the fuelpump an oily look.

How is the dip stick tube attached to the sump? Is it simply pushed in and kept in place by holder at the top, or does it also have a thread at the bottom to fix it to the sump?

There is also a tiny leak from the top between the two crankcase halves. Any suggestions how to stop this without the whole engine being taken apart?


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Doug Smith
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Hi Olav,

The dipstick tube is pushed into the sump and an O-Ring seals it there.  It's restrained at the top support.  Assuming the O-Ring is in good condition and that there's no scratch or anything on the tube, you could disassemble it, clean it thoroughly (which will be tricky without removing the sump) and apply a little gasket sealant to the O-Ring.  You might also try to fit in an O-Ring with a bigger cross section, but chances are there won't be enough room.

 

Leaks between the case halves will be very hard to stop without disassembly.  You could try some Loctite "wick-in" sealant but because the joint will be oily it will be difficult to seal it completely.

Regards,

Doug.


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Olav Soendergaard Poulsen
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Thanks. I will check the o-ring and replace it if needed. Can you confirm the size of it? 18.72x2.62mm.

About the leak between the crankcase halves. There is a visible dent in the seal face (I will send a photo). Looks like the seal faces were slightly damaged before assembly. I will try to stop the leak with Loctite or maybe a liquid sealant can do it?


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Doug Smith
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18.72 x 2.62 will work.  We normally use Viton but Nitrile will also work.

The wick-in sealant is a thin liquid - it seeps into narrow areas via capilliary action, then cures.  It's not bad stuff, but does prefer the surface to be clean.  You might be able to clean the joint using some Aerostart or similar (nil-residue cleaners, ether based, work... Carby or MAF sensor cleaner might also work) before you add it.  Don't put too much on - it is possible for it to seep into other areas and stick things together that you didn't want stuck!

Regards,

Doug.

 


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Olav Soendergaard Poulsen
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Hi Doug. Replaced the o-ring for the dip stick tube, and it seems to have stopped the leak. The old o-ring was flat on the inside after sitting there for 10 years. Nothing else to see.

I would recommend that you in the future make the hole in the sump a straight cylindric hole, and use a dip stick tube with a wall thickness that will allow for the o-ring to be installed in a groove on the tube. That will make the replacement of the o-ring a two minute job with no risk. The current design makes it very awkward to replace and there is a risk that the o-ring could drop into the sump while replacing it.

Regards Olav.


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