SOHC.co.uk Forums > CB750

Engine full of fuel and seized up

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Lobo:
...if the engine turned slowly, and then not at all, hopefully the forces involved were a gradual build versus an instant shock to the Conrods etc. Fingers crossed.

Is it possible, that fuel has pooled in the sump below the pistons and locking from below... ie have you taken the sump plug out / oil filter off to drain all fluids as the next step?

Johnny4428:
Interesting to see if it moves with plugs out and full fluid drain, if it’s stuck still stuck then it’s full strip down.

PJM47:
Yeah sumo drained, spark plugs out, still stuck solid, sounds pretty terminal, any ome know a good engine repairer?

McCabe-Thiele (Ted):
I'm gutted for you as I understand it you have had plugs out, drained the sump and its still solid - that sounds serious.
When you removed the oil filler cap did flud run out then?
Not sure from your description if you cranked the engine with the electric start or with the kickstart it needs a fair bit of pressure to bend a con rod.

I've seen flood damaged engines on Petrol & Diesel engines from when I worked at local MB dealership for 11 years - they tend to bend and often snap con rods or push them through the block as well as piston & valve damage. That said the damage was done when the engine was running. i would expect your damage to be more limited as it was done when attempting to start the engine so less force in play.

Bryanj:
Remember Suzuki GT 250, they bent rods whent fuel tap diaphragm went and that was at kickstart speed.

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