Jack,
the âTâ is a non-issue; the water pressure from the garden hose might be.
There is no way the water can enter through the intake through hull and flow
across the engine to the muffler (the static pressure there is about 0.05 atm
(<1 psi)). But a water under pressure (municipal water supply - 40 â75 psi/
2.5-5 atm) can easily get through the water pump (if it is not in pristine
condition) and through the engine out to the muffler. If the engine is not
working, there is nothing to push that water out and it can back up into the
mixing elbow and to the exhaust manifold (and through an open exhaust valve
into a cylinder).
Marek (in Ottawa)
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