BRP RORAX V-810, Shop Manual, Page: 8 / 46

Section 01 V-810
ENGINE
Subsection
01
(LEAK TEST)
1. Valve cover screws
2. Valve cover
How to Turn Crankshaft
To turn crankshaft, there are two possible proce­
dures.
First Procedure
- turn the drive pulley
Second Procedure
- remove plug screw with 0-ring in ignition cover
- use a
14
mm Allen-key and turn crankshaft.
CAUTION:
Turn only clockwise to avoid loosen­
ing of magneto flywheel Allen-screw.
How to Position Piston at TDC
Using a dial gauge (P/N
414 104 700).
turn the
crankshaft and set the piston to precisely ignition
TDC.
NOTE: The engine must be set to precisely igni­
tion
TDC;
otherwise, the engine will continue to
rotate when pressure will be introduced in cylin­
der.
?
TYPICAL
1. Dial gauge
NOTE:
If a dial gauge is not available, use a screw­
driver or another similarly suitable tool.
CAUTION: Do not scratch or damage pis­
ton/cylinder surface.
NOTE:
At ignition TDC the marks on the camshaft
timing gear have to be parallel to cylinder head
base as per following illustration.
1.
Marks on camshaft timing gear
2. Cylinder head base
3. Camshaft locking tool
How to Lock Camshaft
Lock camshaft at TDC by using camshaft locking
tool
(P/N 529 035 926).
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CAMSHAFT LOCKING TOOL
Leak Test
Connect to adequate air supply.
Set needle of measuring gauge to
z
e r o.
NOTE:
All testers have specific instructions on
gauge operation and required pressure.
Install gauge adapter into previously cleaned spark
plug hole.
··
Supply combustion chamber with air pressure.
1
TYPICAL
1. Leak Tester
2. A ir supply hose
Note the amount or percentage of leakage {de­
pe
n
di n g on tester).
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Section 01 V-810
ENGINE
Subsection 01 (LEAK TEST)
LEAKAGE ENGINE
PERCENTAGE
CONDITION
0%to15% Excellent condition
16% to 25%
Good condition
26% to 40%
Fair condition; reduced
engine performance.
41
% and higher
Poor condition. diagnose
and repair engine.
Diagnosis
Listen for air leaks.
- air escaping on intake port/throttle body means
leaking intake v al v e{s
)
- air escaping on exhaust port means leaking ex­
haust valve{s)
- air bubbles out of radiator means leaking cylin­
der head gasket
- air/oil escaping from crankcase means dam­
aged gasket and/or loosened screws {refer to
BOTTOM ENO)
- air/coolant escaping from cylinder/head means
damaged gasket{s) and/or loosened screws (re­
fer to
CYLINDER AND HEAD)
- air escaping into crankcase area means exces­
sively worn cylinder and/or broken piston rings
(refer to
CYLINDER AND HEAD).
NOTE:
For all the checkpoints mentioned above,
see the appropriate engine section to diagnose
and repair the engine.
REASSEMBLY
NOTE:
Always replace the valve cover gaskets.
Torque valve cover screws to
7
N•m
(62
lbf•in).
Torque spark plugs to
20
N•m {177 lbf•in).
For other components, reverse the preparation
procedure. Ensure to respect torque values and
use of appropriate products/lubricants. Refer to
exploded views of other sections of this manual
or to the appropriate
VEHICLE SHOP MANUAL
as
required.
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