hydrolock

You can theoretically install a starter on the ICE and give it some 12v power, but I'm not sure how this would work in conjunction with the HV system.

And in my non-professional opinion that isn't your problem. I believe the car starts with the 12v battery and not the HV battery, that and your engine ingested water with the engine started. The problem being that water doesn't compress and it could have easily bent some things in your engine.

Also I don't quite understand why you were syphoning from a water tank with your intake...

 

The 12 volt battery only starts the computers in the car.

 

There is no way to start this engine without the HV battery. There is no starter motor, MG1 does that job.

Are you turning the crank with the plugs in or out? I would try turning with the plugs out, just to make sure that it does move through several complete revolutions without problem. I hope there is no valve damage!

 

You should be able to rotate the crankshaft an unlimited number of turns using the crank pulley bolt. If you cannot complete even one full turn with the spark plugs removed, you probably have a bent connecting rod.
By the way, MG1 cranks the engine using power from the HV battery. Under normal conditions, each start attempt uses approx 1% of the battery charge. The minimum state of charge (SOC) to start the engine is about 22%. One bar on the battery indicator is approx 40%. You would need a scantool to accurately read the battery SOC below 1 bar.

 

Yes I agree with the post above having had the same problem with a Mazda 626 bought flood damaged. The engine would only turn about 1/2 a revolution before locking.

The best solution in your position is to fit a secondhand unit from a breakers yard, quicker and cheaper than dismantling and repairing the engine you have as other damage might be discovered.

John (Britprius)

 

You read wrong.

SPH-D710 ? 2

 

A normal Prius engine can be turned over by hand when car is off since it has very little compression in this mode. It takes a little effort but you can turn the crank pulley with your bare hands.

You can bolt a 12V starter to the Prius motor but it won't do anything since their is no ring gear on the flywheel for it to mate with.

 

If you don't want to do the work yourself, find a local independent Toyota shop to help you change out the engine.

They don't even have to be a hybrid specialist.
Once you remove the inverter dropping the engine/tranny is similar to Yaris/Corolla. I can offer tips/guidance via telephone if you find a shop willing to do it.

You can also make a lowering winch like this and do it your garage yourself. (photos from a gen1 but gen2 is similar) Technical question -- Engine Swap | PriusChat

It's not that hard if you are a weekend wrencher and have basic shop tools or can borrow tools from a friend.

 

Some smaller dealers are willing to let customers BYOP. (bring your own parts)
Best to call around your area. Good used engine should be no more than $600-$800 these days.

 

Replacing con rods can be done without removing the engine. All that is required is removal of the cylinder head and sump pan. The problem with the Prius engine is the cylinder liner may be cracked.

Parts that will be needed apart from gaskets:-

Con rod
Set of big end shell bearings
Possibly 1 piston and ring set.
+ gaskets, oil, and engine coolant.

When I did the Mazda one con rod was bent and the bearing shell flattened. The piston had compressed jamming the rings. The 16 valve cylinder head and valves were fine. Belt driven cams interference engine.

John (Britprius)

 

Removal of the sump pan is not a big job and a fare assessment of the damage can be made from the bottom of the engine.

John (Britprius)