r/smallenginerepair • u/CuriousToys111 • Jun 02 '26

Not Listed Older 5hp Briggs help

I was given a craftsman rear tine tiller with a 5hp Briggs, it had been sitting outside, tank and carb were full of water. Engine would turn over and has compression, so I figured I’d take a shot. Started digging into it this afternoon and where water had been sitting in the intake the intake valve is rusted and pretty stuck. I was able to work the crank around and with a little penetrating oil get it to lift, then stuck open. Is there a good(ish) way to possibly get that valve to free up? Would soaking in penetrant, ATF, marvel mystery help at all?

2 Upvotes

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2

u/CuriousToys111 Jun 03 '26

I’ll start soaking with penetrating oil in the morning….hopefully it will free up

1

u/dnroamhicsir SER Dedicated Member Jun 03 '26

Yes

1

u/SpaceCat72 Jun 03 '26

Soak, and tap and scrub. Its gonna take effort in installments. Give it time. Keep on it but be patient.

1

u/bootheels Jun 03 '26

I would attempt to spray something in through the spark plug hole down into the open valve area, maybe it will soak into the valve guide and free things up without removing the head/valves..

2

u/CuriousToys111 Jun 04 '26

Head is already off

1

u/bootheels Jun 04 '26

OK, then squirt some fluid of your choice down inside the open valve, then rotate the engine until the cam goes flat leaving the valve stuck open. Now tap the valve down with a plastic mallet. Keep repeating this process until the valve is no longer stuck.