hydrolocked engine grrrrrrrrrrrrrrr

[farquare]

Okay, some of you may have seen my other thread where my bike keeps being blowing over in the wind: http://forums.sv650.org/showthread.php?t=166806

Long story short the front cylinder filled with oil and i tried to start it.

The bike now runs, but not on the front cylinder. I've got spark, i've tried changing the plugs round too. There is visable pressure in the front cylinder as it will move a rag stuffed down the plug hole, carbs seen to be fuelling too.

I'm kinda down about the whole thing but before i decide to scrap the bike i would appreciate any tips or advice on what to do next.

Compression test?

or are there any other simple checks or procedures which would help me identify what's wrong?

[maviczap]

Doesn't sound good I'm afraid, as you might have bent a rod if it was hydraulically locked?

Can you turn the engine over with the back wheel on the paddock stand when its in gear?

Front plug clean & working?

Hi,
To be fair its prob bent the conrod ive seen this a few times on vehicles i have worked on (mainly Buses and trucks) but wouldnt like to say this is the cause for it not running on that cylinder can you measure the height of the piston with the plug out and do the same on the good side?
Ive never really hand much to do with motorcyle engines but have rebuilt a fair few heavy goods.

Sorry not much help Gaz

[andrewsmith]

Originally Posted by maviczap

Doesn't sound good I'm afraid, as you might have bent a crank if it was hydraulically locked?

Can you turn the engine over with the back wheel on the paddock stand when its in gear?

Front plug clean & working?

I'm with mavi, sounds terminal (if everything else is tickety boo). You wouldn't be able to check for a bent crank without stripping the motor.

pm yorkie chris or rictus mate

[farquare]

i can understand bending a crank if the engine was running when fluid gets in, the bang in the good cylinder having massive opposite force on the other.
but would trying to start a bike with 1 clyinder full of oil have enough power to do damage?
the starter did not spin just engaged and stopped due to the resistance....

[andrewsmith]

Originally Posted by farquare

i can understand bending a crank if the engine was running when fluid gets in, the bang in the good cylinder having massive opposite force on the other.
but would trying to start a bike with 1 clyinder full of oil have enough power to do damage?
the starter did not spin just engaged and stopped due to the resistance....

Sadly yes as engine oil is more dense and compresses less easily than petrol.
Engine oil would theoretically combust under very high pressure/ compression

[farquare]

i've pretty much resigned myself to the worst by now, looks like no biking for me this year.

thanks for the replies and suggestions.

[maviczap]

Originally Posted by andrewsmith

Sadly yes as engine oil is more dense and compresses less easily than petrol.
Engine oil would theoretically combust under very high pressure/ compression

Sorry I meant you'd bent a rod, not the crank in my first reply

Simple physics you can compress a gas, but not a liquid.

Hydraulic lock in a diesel is a bad thing, and not much better in a petrol.

[andrewsmith]

Originally Posted by maviczap

Sorry I meant you'd bent a rod, not the crank in my first reply

Simple physics you can compress a gas, but not a liquid.

Hydraulic lock in a diesel is a bad thing, and not much better in a petrol.

I thought a diesel would use lighter engine oils as fuel, or am I incorrect in thinking that.

Bent rod is slightly better than a crank.