Oil Injection (if equipped) Rammer Repair
122 wc_tx001549gb.fm
7.4 Oil Line Check Valve
See Graphic: wc_gr001527
The the function of the oil line check valve (a) is to prevent raw fuel
from backing up to the oil pump. It is important that the check valve be
installed in the correct direction. Looking at the side of the check valve,
one should notice recessed areas with pointed ends or an arrow (b).
The pointed ends or the arrow must point towards the fuel line. This is
the direction of oil flow.
To test the check valve:
The oil line check valve is spring operated and is designed to release
at 1.5 psi. Note: Initial release can be as high as 4.5 psi.
7.4.1 Remove the oil line check valve from the oil line.
7.4.2 Attach a hand-operated vacuum pump to the outlet side (pointed end)
of the oil line check valve and operate the vacuum pump until the
vacuum overcomes the oil line check valve spring. Measure how much
vacuum it takes to operate the oil line check valve. A vacuum reading
of more than 2 psi (after initial release) is grounds for replacing the oil
line check valve.
Note: The oil line check valve is only available by replacing the entire
hose assembly.
Newly installed oil line check valves (and those that have lost their
prime) require priming. There are two methods of priming the oil line
check valve line with oil.
Vacuum method:
7.4.3 Attach a hand-operated vacuum pump to the fuel line end of the oil
hose.
7.4.4 Place the oil pump side of the hose in a container of 2-cycle oil.
7.4.5 Operate the vacuum pump until the oil reaches the vacuum pump.
7.4.6 Install the oil line to the oil pump and to the fuel line.
Pressure method:
7.4.7 Attach a syringe filled with 2-cycle oil to the oil pump end of the hose.
7.4.8 Inject the oil into the hose until it passes through the oil line check
valve.
7.4.9 Attach the oil line to the oil pump.
NOTICE: The oil line check valve is an important part of the oil injection
system and should not be bypassed. Engine failure may occur.
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