INSTRUCTION AND MAINTENANCE MANUAL FOR JABIRU 2200 ...

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Jabiru Aircraft Pty LtdInstruction & Maintenance ManualJabiru <strong>2200</strong> Aircraft EngineHydraulic Valve Lifter Models7.5.1.3 Crankcase Decking / MachiningNOTE:This is an advanced procedure which must only be carried out by suitableworkshops. It is recommended that this work be done through Jabiru Aircraft orour locally approved representative.In some cases the crankcase may need to be machined – “decked” – to repair damageto the crankcase mating surfaces. A maximum of 0.15mm may be taken from eachcase half over its life.If the case is machined, line-boring may be required to re-size the crankshaft andcamshaft bores to within the approved dimensional limits.If the case is machined, a continuous shim of 0.5mm metal shim material must befitted beneath the cylinder bases to prevent an increase in the compression ratio.7.5.1.4 Sub-Assembly C - Pistons, Cylinders and Cylinder HeadsC11. Clean oil off heads2. Dip heads in a cold dip solvent (i.e. Redik dkt Degreaser - Decarboniser -Paint stripper) as per manufactures instructions to remove all carbondeposits.3. Note: The heads can be bead blasted, but care must be taken.4. Wire buff valves5. Clean all other partsC2Cylinder Head Inspection and Repair1. Inspect cylinder head for flatness. If sealing surface show signs of leakageit may need refacing. When refacing, remove only the minimum to cleanup.2. Measure valve guide wear3. If wear is excessive remove guides. Measure valve guide bore in the head.The new guide must have at least 0.05mm (0.002") interference on theoutside diameter.Note - The standard guide has no dimples in top (P.N.4518064) In(P.N. 4519064) Ex0.05mm (0.002") has one dimple0.05mm (0.004") has two dimples0.05mm (0.006") has three dimples4. Press guides back in.Note - Oil hole must go up5. Special Note Guides: Guides are installed at 7.045 - 7.050mm borediameter. Guides from 7.08mm can cause oil usage in the engine (max.valve stem to guide clearance is 0.12mm).Note: Valve guides and valve seats are installed to a specific program. Valveguide replacement is relatively straightforward. Valve seat replacement requiresspecial tools and techniques and it is strongly recommended that valve seats arenot replaced. Advice is available on request.6. Mount head up and cut seats as per drawingThis document is controlled while it remains on the Jabiru server. Once this no longer applies the document becomes uncontrolled.REVISION 0 1 2 3 4 5 6 7 8 9 Dated : June 2010 Issued By: DPS Page: 48 of 116L:\files\Manuals_For_Products\Engine_Manuals\Transition\JEM2204-9_I&M_unsigned.docx
Jabiru Aircraft Pty LtdInstruction & Maintenance ManualJabiru <strong>2200</strong> Aircraft EngineHydraulic Valve Lifter ModelsFigure 14. Drawing 944064 – Valve Guide ReplacementNote - When cutting seats cut enough to clean up but try to remove as little aspossible. This will give maximum number of overhauls on heads. The diagrambelow gives general valve seat cut geometry. Engines use seat width cut fromapproved dwg. 4797004(I) and 4790004(E).Figure 15. Valve Seats7. Use ground and serviceable valves to check seat contact.Note - If machine has a vacuum tester, vacuum test valves8. Heads of valves must be above the level of the combustion chamber. Ifthey are below, the valves and heads must be replaced. Minimum deckThis document is controlled while it remains on the Jabiru server. Once this no longer applies the document becomes uncontrolled.REVISION 0 1 2 3 4 5 6 7 8 9 Dated : June 2010 Issued By: DPS Page: 49 of 116L:\files\Manuals_For_Products\Engine_Manuals\Transition\JEM2204-9_I&M_unsigned.docx
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