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Questions on old 912

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craig(at)craigandjean.com
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Posted: Wed May 07, 2008 8:14 am Post subject: Questions on old 912

I'm looking at a project that includes an old 912. Supposedly this is a 100

hp model (ULS?) made in 1998. The serial number is 4.425.588. The gear box

part number is 888-560 with a s/n of 16535. The engine is said to have only

6 hours on it. It includes a Woodcomp 3 bladed, ground adjustable prop.



The big question is it a reasonable used engine? Based on the s/n I don't

see any significant service bulletins. Other questions:



- The gear box p/n indicate that the engine does not have the slipper

clutch. I believe I can retrofit the clutch with Rotax p/n 996-889

(approximate cost $1000). Does it make sense to add the clutch?



- can I add the clutch or does it have to be done by an authorized Rotax

shop?



- how can I confirm that the s/n is for a 100 hp engine?



- any issues with the engine being stored that long?



- any other questions I should ask the seller?



-- Craig Payne

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rholder(at)avnet.co.uk
Guest

Posted: Wed May 07, 2008 8:55 am Post subject: Questions on old 912

Craig Payne wrote:



 	  Quote: 	
		   I'm looking at a project that includes an old 912.

 Supposedly this is a 100 hp model (ULS?) made in 1998.

 The serial number is 4.425.588. The gear box part

 number is 888-560 with a s/n of 16535. The engine is

 said to have only 6 hours on it. It includes a Woodcomp

 3 bladed, ground adjustable prop.

 

 The big question is it a reasonable used engine? Based

 on the s/n I don't see any significant service

 bulletins. Other questions:

 

 - The gear box p/n indicate that the engine does not

 have the slipper clutch. I believe I can retrofit the

 clutch with Rotax p/n 996-889 (approximate cost $1000).

 Does it make sense to add the clutch?

 

 - can I add the clutch or does it have to be done by an

 authorized Rotax shop?

 

 - how can I confirm that the s/n is for a 100 hp

 engine?

 

 - any issues with the engine being stored that long?

 

 - any other questions I should ask the seller?

 

 -- Craig Payne


	


It is a 100 hp engine - I found that 912ULS engine numbers

start at 4425-001 so yours is a very early one ! See

SB--912-042UL R1.



There are lots of SB, SL and SI associated with the

engine. Look them up on the Rotax site.



"Based on the s/n I don't see any significant service

bulletins." is flippant and incorrect.



6 hours isn't many. Ask the seller - why did he stop using

it ? Did he write off the aircraft ? If so was the engine

shock loaded (a problem if it has no slipper clutch). 6

hours is hardly enough time to prove the airworthiness of

the aircraft it was attached to !



If it has been used and recorded correctly there should be

an engine log-book associated with the engine. That should

show whether any SB have been applied.



If the engine was just stopped one day and has been left

for 5 or 6 years then there is an issue especially if it

was outside or had any open orifices. There will be

lots of rust ! If it was "put into storage" with oil in

the cylinders and various other precautions then it might

be OK. Not sure I would want to use the engine without a

full strip down, or a full inspection with a camera snake !



Richard Holder

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craig(at)craigandjean.com
Guest

Posted: Wed May 07, 2008 9:45 am Post subject: Questions on old 912

 	  Quote: 	
		   "Based on the s/n I don't see any significant service bulletins." is

flippant and incorrect.
	




"Significant" as in "there is no fix" or "it will cost a lot of money and

time to correct". Of the 27 SB's pulled-up by the Rotax owner site for this

s/n I see a lot of "inspect" and "check". These look like the biggest

issues:



SB-912-022UL - Replacement of Valve Spring Retainer on Single Valve Spring

Conf. 912 & 914

SB-912-040UL - Introduction Of A New Oil Dipstick For Rotax Engine Type 912

& 914 (Series)

SB-912-037   - Installation Of Electric Starter With Enhanced Power For 912

& 914 Engines - R1.



Supposedly the engine was fitted to a light aircraft and was "too much for

the plane" and was removed. I'll be looking for more documentation of its

history when I inspect the engine.



Thanks, Craig

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