Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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Dated : 28/10/2014
Issued By: AS
Page: 18 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
ends) are machined to fit the gudgeon pin. The big end bearing end caps are fixed to the connecting
rod by two Allen head cap screws through the rod into the end cap.
2.13.10
Crankshaft
The crankshaft is machined from solid bar 4140 chrome molybdenum alloy steel and is stress relieved
using a heat treatment process. The journals are precision ground prior to being inspected by the MPI
(Magnetic Particle Inspection) method.
2.13.11
Crankcase
The crankcase is machined from solid aluminium billet and consists of two halves divided along the
vertical centreline and fastened together by the studs and nuts that retain the cylinders. The mating
surfaces of the crankcase halves are joined without the use of a gasket, and the main bearing bores are
machined for the use of automotive slipper type bearings. Thrust bearings are located fore and aft of
the front double main bearing. The crankcase forms the bearings for the camshaft.
2.13.12
Camshaft
The camshaft is machined from solid bar 4140 chrome molybdenum alloy steel and is hardened using a
nitriding process.
2.13.13
Valve operating mechanism
The camshaft is gear driven from the crankshaft. The camshaft operates cam followers that operate the
valves though pushrods and valve rocker arms. The valve rocker arms are made from steel, induction
hardened and mounted in the cylinder heads on steel shafts through low friction bronze/steel bushes.
2.13.14
Solid lifters
2200 and 3300 engines earlier than serial number [22A-2068] or [33A-961] utilise solid lifters driven by
a 330° camshaft.
2.13.15
Hydraulic lifters
2200 and 3300 engines from serial number [22A-2068] or [33A-961] use hydraulic lifters.
2.13.16
Roller Followers
2200 and 3300 engines from serial number [22A-3596] or [33A-2539] use hydraulic lifters with roller
bases.
2.13.17
Lubricating system
All engines employ a full pressure wet sump lubrication system. A positive-displacement pump driven
from the front of the camshaft provides oil pressure, and oil is circulated to the oil galleries through a
spin-on automotive type oil filter. An adaptor fitted beneath the oil filter feeds oil to the oil cooler.
The primary lubrication sections of the engine
– crankshaft, big ends etc – use this full pressure
lubrication system. Secondary lubrication sections of the engine such as the cylinder heads and
gearbox use low pressure lubrication systems while tertiary lubrication sections such as piston/bore
lubrication uses splash lubrication.
2.13.18
Cooling system
Cooling is provided by air pressure that is built up above the cylinder heads in the ram air ducts and
discharged, with an accompanying pressure drop, down through the cooling fins on the cylinder heads
and cylinders and out of the lower rear of the engine cowling.
2.13.19
Induction system
All engines are equipped with a BING brand pressure compensating float type carburettor. The inlet
manifold is mounted in direct contact with the engine oil sump, thus providing a relatively constant
temperature
in
the
manifold
for
more
uniform
vaporisation
of
fuel.
Fuel-air mix is distributed from the manifold to the cylinder heads by individual tubes.
