26. JANUARY 2012 Current valid documentation see: ASB-912-060

Initial Issue www.rotax-aircraft-engines.com ASB-914-043

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved. page 1 of 9

d05296.fm

ALERT SERVICE BULLETIN

CHECKING OF THE OIL PUMP FIXING BOLTS FOR CORRECT TORQUE

FOR ROTAX® ENGINE TYPE 912 AND 914 (SERIES)

ASB-912-060

ASB-914-043

Symbols used:

Please, pay attention to the following symbols throughout this document emphasizing particular information.

▲ WARNING: Identifies an instruction, which if not followed, may cause serious injury or even death.

■ CAUTION: Denotes an instruction which if not followed, may severely damage the engine or could lead to suspension of warranty.

◆ NOTE: Information useful for better handling.

A revision bar outside of the page margin indicates a change to text or graphic.

1) Planning information

1.1) Engines affected

All versions of the engine type:

- 912 S from S/N 4,924.287 up to S/N 4,924.295 inclusive/4,924.300 up to 4,924.304 inclusive/4,924.342 up to 4,924.350 inclusive/4,924.352/4,924.353

- 914 F from S/N 4,421.079 up to S/N 4,421.081 inclusive

1.2) Concurrent ASB/SB/SI and SL

none

1.3) Reason

Within the scope of permanent quality checks we have identified a deviation in the assembly process of the 

oil pump fixing bolts. In some cases these bolts were not tightened according to the proper torque specification which can possibly cause oil leaks, irregular oil supply which may lead to engine stoppage.

1.4) Subject

Checking of the oil pump fixing bolts for correct torque for ROTAX engine type 912 and 914 (Series).

1.5) Compliance

- before the next flight, but at the latest by 01. August 2012 the “Checking of the oil pump fixing bolts“ must 

be conducted according to the following instructions in section 3.

▲ WARNING: Non-compliance with these instructions could result in engine damages, personal injuries 

or death.

1.6) Approval

The technical content of this document is approved under the authority of DOA ref. EASA.21J.048.

MANDATORY
26. JANUARY 2012 ASB-912-060

Initial Issue ASB-914-043

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved. page 2 of 9

1.7) Manpower

Estimated man-hours:

engine installed in the aircraft - - - manpower time will depend on installation and therefore no estimate is 

available from the engine manufacturer.

1.8) Mass data

change of weight - - - none.

moment of inertia - - - unaffected.

1.9) Electrical load data

no change

1.10) Software accomplishment summary

no change

1.11) References

In addition to this technical information refer to current issue of

- Illustrated Parts Catalog (IPC))

- Maintenance Manual (MM)

◆ NOTE: The status of Manuals can be determined by checking the table of amendments of the 

Manual. The 1st column of this table is the revision status. Compare this number to that 

listed on the ROTAX WebSite: www.rotax-aircraft-engines.com. Updates and current revisions can be downloaded for free.

1.12) Other publications affected

none

1.13) Interchangeability of parts

not affected

2) Material Information

2.1) Material - cost and availability

Price and availability will be supplied on request by ROTAX® Authorized Distributors or their Service Center.

2.2) Company support information

none

2.3) Material requirement per engine

Parts requirement in case of leaks:

- consumables e. g. O-rings, gasket rings and spare parts of the valve train in accordance with the relevant

Illustrated Parts Catalog.

2.4) Material requirement per spare part

none

2.5) Rework of parts

none
26. JANUARY 2012 ASB-912-060

Initial Issue ASB-914-043

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved. page 3 of 9

2.6) Special tooling/lubricant-/adhesives-/sealing compound

Price and availability will be supplied on request by ROTAX® Authorized Distributors or their Service Center.

* or equivalent

■ CAUTION: In using these special tools, observe the manufacturer ́s specifications.

item no New

part no Qty/engine Description Oldpart no. remarks

- 1 valve spring loading jig assy. 877387* valve spring

- AR slide paste 

MOLYKOTE G_N

297433 rocker arm bearing

- 1 screw nipple 276855* spark plug tapping
26. JANUARY 2012 ASB-912-060

Initial Issue ASB-914-043

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved. page 4 of 9

3) Accomplishment / Instructions

◆ NOTE: Before maintenance, review the entire documentation to make sure you have a complete understanding of the procedure and requirements to prevent mistakes from an incomplete review of all 

of the information in this document.

Accomplishment

All the measures must be taken and confirmed by the following persons or facilities:

- ROTAX® -Airworthiness representative

- ROTAX® -Distributors or their Service Centers

- Persons approved by the respective Aviation Authority

▲ WARNING: Proceed with this work only in a non-smoking area and not close to sparks or open flames. Switch 

off ignition and secure engine against unintentional operation. Secure aircraft against unauthorized 

operation. Disconnect negative terminal of aircraft battery.

▲ WARNING: Risk of scalds and burns! Allow engine to cool sufficiently and use appropriate safety gear while 

performing work.

▲ WARNING: Should removal of a locking device (e.g. lock tabs, self-locking fasteners, etc.) be required when 

undergoing disassembly/assembly, always replace with a new one.

◆ NOTE: All work has to be performed in accordance with the relevant Maintenance Manual.

3.1) Inspection of the oil pump/valve train

■ CAUTION: The following steps are important, read carefully!

1. Perform inspection for oil leaks in the area of the oil pump. See fig. 1.

2. If you notice oil leaks then all following tasks have to be performed from section 3.1.1 to 3.3 inclusive.

3. If you notice no oil leaks then only the section 3.1.1 need to be performed.

◆ NOTE: The torque control must be performed on all affected engines, regardless of any oil 

leaks.

3.1.1) Inspection of the specified tightening torque for the oil pump fixing bolts

◆ NOTE: Tighten allen screws in a crosswise sequence!

1. Check and/or tighten the 4 oil pump (1) allen screws (2) with lock washer to 10 Nm (90 in.lb.).

3.1.2) Inspect the oil pump (required if oil leaks on oil pump discovered)

1. Remove the oil pump in accordance with the relevant Maintenance Manual (Heavy).

2. Inspect the surfaces for wear, cracks or damages.

3. Replace all O-rings (3) and gasket rings (4). Spare and replacement parts should be ordered 

using the current Illustrated Parts Catalog.

4. Install the oil pump in accordance with the relevant Maintenance Manual (Heavy).

3.1.3) Inspect of valve train (required if oil leaks on oil pump discovered)

See fig. 2.

The following steps are necessary to rule out a pre-damage of the valve train:

1. Remove the spark plug connector and the 4 top spark plugs (1). 

■ CAUTION: Prevent entering of foreign matter through spark plug hole.

2. Remove Allen screw (2) M6x30 with washer (3) from valve cover (4).

3. Remove large and small O-ring (5) and (6).

4. Tap valve spring retainers slightly with a soft mallet to loosen valve spring retainers from the valve cotters.

5. Turn crankshaft so that the respective piston is exactly on ignition top dead centre (compression 

stroke).

6. Remove the external cap nut (7) (exhaust side of cylinder).
26. JANUARY 2012 ASB-912-060

Initial Issue ASB-914-043

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved. page 5 of 9

■ CAUTION: Do not remove the other cylinder head nuts. During removal of the cylinder head 

nut, the head stud may come loose requiring re-installation as per current Maintenance Manual. Tightening torque of the stud 3 Nm (26 in.lb.)

7. Attach the support plate (8) for the valve spring loading jig (9) with 2 hex. screws (10) M6x16 at 

the attachment points (11) on the cylinders.

8. Attach the valve spring loading jig on cylinder head and support plate with 2 Allen screws (12) 

M6x70.

9. Fit the screw nipple (13) into the spark plug hole.

■ CAUTION: At fitting of the screw nipple take care not to damage the spark plug threads.

10. Securly hold crankshaft in top dead centre position for respective cylinder by utilizing a socket 

wrench on magneto side.

11. Admit approximately 2 bar (30 psi) air pressure into cylinder.

▲ WARNING: Risk of injury due to rotating socket wrench. Failure to adequatly secure the crankshaft in a fully stable position could lead to un-intentional rotation of the crankshaft 

resulting in serious injury. Remove socket wrench after positioning.

12. Depress the 2 valve spring evenly by the valve spring loading jig (9) until the valve cotters are 

easily accessible. Simultaneously both hydraulic tappets will be relieved.

13. Remove rocker arm shaft (14).

■ CAUTION: At removal take care not to damage the rocker arm shaft bearings in the cylinder 

head.

14. Remove both rocker arms (15) and (16).

15. Remove the valve cotters (17).

◆ NOTE: To facilitate the removal of valve cotters use grease or magnet.

16. Remove the valve spring loading jig (9).

17. Remove the valve spring retainers (18).

18. Remove the inlet- and outlet valve springs.

19. Remove the washers.

20. Check the washers for increased wear.

21. Assessment of washers:

◆ NOTE: For proper assessment of washers see Maintenance Manual Heavy chapter 

72-00-00.

Less than < 0.02 mm (0.0008 in.)

Reassembly the cylinder head. 

See sec. 3.1.4.

Reinstall the valve cover with new O-rings.

Purge oil system according to Maintenance Manual Line chapter 12-20-00.

Greater than > 0.02 mm (0.0008 in.)

Replace the washer, valve, valve cotter and valve spring retainer.

Reassembly the cylinder head.

See sec. 3.1.4.

Purge oil system according to Maintenance Manual Line chapter 12-20-00.

Reinstall the valve cover with new O-rings.
26. JANUARY 2012 ASB-912-060

Initial Issue ASB-914-043

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved. page 6 of 9

3.1.4) Assembly of the cylinder head

See fig. 2.

◆ NOTE: To facilitate installation apply a bit of grease so that the valve spring retainer (18) 

will remain on the valve spring.

1. Insert the washers.

2. Insert the inlet- and outlet valve springs.

3. Re-fit the valve spring loading jig assy (9) analogous to procedure for removal of the valve spring 

retainers.

4. Depress the 2 valve springs evenly by screwing in the 2 Allen screws (12) until the valve cotters 

can be inserted.

◆ NOTE: If the valve spring loading jig (9) does not press down the valve spring retainer correctly it could touch the valve system, possibly resulting in pressure loss in the cylinder.

5. Insert 2 new valve cotters (17) per valve.

◆ NOTE: To facilitate the fitting apply a bit of grease so that the valve cotters will remain in 

position.

6. Relieve pressure in the cylinder.

7. Push valve inwards so that the valve cotters will stay in position.

8. Apply MOLYKOTE G-N to the bore in the rocker arm, to the push rod tip and the valve contact 

surface.

9. Make sure that the piston of the respective cylinders remains in compression top dead centre.

◆ NOTE: Loss of top dead centre positioning of respective cylinder could result in difficulty 

of rocker arm installation. If necessary reposition to top dead centre.

10. Place inlet rocker arm (15) and outlet rocker arm (16) into position, apply MOLYKOTE G-N on 

both ends of rocker arm shaft (14) and insert it into its bore in cylinder head.

■ CAUTION: The rocker arm bearing is a slide fit. Do not apply force.

11. Remove the valve spring loading jig (9) and the support plate (8).

12. Re-install cylinder head nut as per current Maintenance Manual.

13. Verify proper fit of the valve cotters and secure fit in valve spring retainer by tapping with a soft 

mallet.

14. Lubricate all moving parts in the rocker arm space.

15. Clean the sealing surface of cylinder head and valve cover.

16. Insert new O-ring (5) 105x2,5 and O-ring (6) 6,4x1,8 into the valve cover (4).

17. Fit valve cover.

◆ NOTE: Between the 2 valve covers a gap of min. 0,2 (.008 in.) must remain. The covers 

must not touch each other.

18. Tighten the new Allen screw (2) M6x30 with washer (3) to 10 Nm (90 in.lb.).

■ CAUTION: Carefully inspect the length of the valve cover screw. Check whether thread is damaged. If the screw is loose or the valve cover leaking, the oil return into the oil tank 

by “blow-by gas” will not properly function. Improper installation of the valve cover 

could lead to loss of crankcase pressure.

19. Remove the screw nipple (13) from the top spark plug hole.

20. Re-fit the wiring and top spark plug (1) and tighten to 20 Nm. Fit spark plug connector according 

to marking.

21. Repeat the procedure on the remaining 3 cylinders.

- Restore aircraft to original operating configuration.

- Connect negative terminal of aircraft battery.
26. JANUARY 2012 ASB-912-060

Initial Issue ASB-914-043

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved. page 7 of 9

3.2) Test run

Conduct test run including ignition check and leakage test.

3.3) Summary

These instructions (section 3) have to be conducted in accordance with compliance in section 1.5.

The execution of the mandatory Alert Service Bulletin must be confirmed in the logbook.

Approval of translation to best knowledge and judgement - in any case the original text in German language and 

the metric units (SI-system) are authoritative.
26. JANUARY 2012 ASB-912-060

Initial Issue ASB-914-043

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved. page 8 of 9

4) Appendix

the following drawings should convey additional information:

Fig. 1

Oil pump 912/914 Series

1 oil pump

2 allen screws

3 O-rings

4 gasket rings

09498

2

4

3

3

3

2

3

3

3

1

1

914 Series

912 Series 4

4

3

4

4
26. JANUARY 2012 ASB-912-060

Initial Issue ASB-914-043

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved. page 9 of 9

Fig. 2

valve train

◆ NOTE: The illustrations in this document show the typical construction. They may not represent full detail 

or the exact shape of the parts which have the same or similar function.

Exploded views are not technical drawings and are for reference only. For specific detail, refer to 

the current documents of the respective engine type.

1 spark plug

2 allen screw

3 washer

4 valve cover

5 O-ring

6 O-ring

7 cylinder head nut

8 support plate

9 valve spring loading jig assy.

10 hex. screws

11 center cutoff

12 hex. screws

13 screw nipple

14 rocker arm shaft

15 rocker arm

16 rocker arm

17 valve cotters

18 valve spring retainer 08697, 04699, 04686

13

8

14

12

9

10

7

15

16 6

5 3

2

4

17

18

11

1