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Vangaurd went Pop

557 Views 11 Replies 7 Participants Last post by  Forest Gump, 
T
Was mowing with the 3018 and the engine lost power for a second then raved up and made a loud pop. Turned the key and get a metal on metal knocking sound . Front pulley turns by hand with no compression. serious problem I’m assuming.

I may have a disabled 3018 for sale if anyone is interested.
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dhitching
Yikes!

On the plus side, Vanguard parts are abundant and used or new engines are available. If your 3018 was an Onan you'd be having a much more difficult time!
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24mee
Tzack said:
Was mowing with the 3018 and the engine lost power for a second then raved up and made a loud pop. Turned the key and get a metal on metal knocking sound . Front pulley turns by hand with no compression. serious problem I’m assuming.

I may have a disabled 3018 for sale if anyone is interested.
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It could just be a blown head or head gasket. Shouldn't be difficult to replace. A hole or a crack may be visible given the loud pop as you described.
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k0jdd
It seems odd that there is NO compression at all unless the you somehow managed to break both rods at the same time -- or perhaps you broke the entire crankshaft.

If you remove both heads and crank it by hand you will be able to see if the pistons are moving at all...you can also see if there is any damage to the valves and heads.
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T
So, is it necessarily an engine issue or could it be the electric clutch ?
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R
I would put the clutch on the last to try list if I was you. The clutch would not cause a loss of power as you originally posted and anyway the engine would stay running just with no drive. It would seem to be an engine issue and could be a number of things. If it was me, I would pull the heads and check valves and piston movement at the very least.
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T
I pulled the spark plugs and stuck a screwdriver in each cylinder and then turned the front pulley and neither piston moved.
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k0jdd
That seems to indicate that the crank is broken between the front pulley and the first cylinder.

Time to pull the engine and then pull the oil pan so you can see what you’re dealing with.


Sent from my iPhone using Tapatalk
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B
I'm going to suggest something is not adding up in the diagloue here. You keep referencing rotating the pulley (PTO clutch), but not specifically the crankshaft.

Take the simple step of removing the PTO from the crankshaft.

Then, check your piston movement (or cranking the engine) with the bare crankshaft. With the spark plugs out, you should be able to turn the crankshaft stub by hand and observe piston motion (in a good engine, of course).

If it turns by hand, then put a compression gage in 1 cylinder and see what you have ...

Worst case, you took the PTO off before you pull the engine ...

Brian
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R
I could agree with Brian as rotation of the crankshaft because of a PTO problem but my issue is still the same the engine lost power and stopped!!! The PTO will not cause that at all. Only an engine problem will.
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T
When this first happened I turned the key to try and restart it. Each time I turned the key it made a single metal on metal “tunk“ . I kept trying and it finally “tunked” about three times and stopped . Now when I turn the key it makes absolutely no sound at all, not even a battery tic.
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F
You need to think about getting to the crankshaft so as you can turn the crank, both backward and forward.
If that is a electric PTO pulley you are turning and the crankshaft is not turning that is normal. the electric clutch is not en-gauged.
If you can turn/wiggle THE CRANKSHAFT remove both spark plugs and insert a screwdriver to see if the pistons move any.
Them Briggs vanguards are little easier to replace/repair vs a Onan engine but the Horiz crankshaft types are not as easily found as the verticals in my neck of the woods.
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