Seized engine

[clasavi]

2016 383 stroker with 20 hours

Last years I ran the boat from the marina to the ramp with no issue. brought the boat to the house drained the water from the manifolds, block and stored it. This is year the engine is locked up. Is that possible?

I removed the lower unit and the engine is still locked/seized

No sign of water in the oil

 

[alldodge]

Any signs of water/rust on the plugs?

 

[clasavi]

Any signs of water/rust on the plugs?

No. Everything looks normal.

 

[alldodge]

Start with basics
Is your battery fully charged?

What happens when the starter engages?
Do the battery cables heat up?

Can you turn the motor with plugs out by the belt?

 

[clasavi]

Start with basics
Is your battery fully charged?

What happens when the starter engages?
Do the battery cables heat up?

Can you turn the motor with plugs out by the belt?

Thank you for the reply

1) Batteries are charged
2) I haven’t checked the cables but will do
3) starter engages and I get one clunk
4) I cannot turn the motor with plugs out
5) I did spay some PB blaster and let it sit for couple of days. Still not turning. I’m using a crowbar at the fly wheel and still can’t turn it.

 

[alldodge]

Doesn't sound good. It wouldn't take much water to seize a motor

You've done all the checks. Lets hope PB loosens things up

 

[clasavi]

Doesn't sound good. It wouldn't take much water to seize a motor

You've done all the checks. Lets hope PB loosens things up

Thank you. It’s nearly unbelievable or a case of really bad luck.

 

[Scott Danforth]

when you drained the block, manifolds, etc. did you prob the holes

 

[clasavi]

when you drained the block, manifolds, etc. did you prob the holes

What’s “prob”?

 

[dubs283]

What’s “prob”?

I believe they meant "probe", as in use a wire or other small pick style tool to dislodge any debris to allow full draining of cooling water

 

[alldodge]

MY thought is there might be a small intake leak and had just enough to get a small amount into a cylinder. If that's the case, the PB sitting long enough should free it up over time

 

[clasavi]

update. i got the engine to turn!!! ty

one more question - when reinstalling the lower unit, do I need to use a sealant?

 

[alldodge]

Don't know which drive but Alpha or Bravo needs to sealant

 

[Bondo]

update. i got the engine to turn!!! ty

one more question - when reinstalling the lower unit, do I need to use a sealant?

Ayuh,..... The Alpha needs the gasket kit, 'n I believe the Bravo is sorta an o-ring affair,....
Neither need sealant,.....