Hyundai G4FA engine

[DIYspanner]

2009 1.4 petrol

Does anyone know if its an anti-clash design?

I believe, from the sudden rattling, that the chain has failed and I'm wondering if any of the valves have been hit by a piston.

The engine still cranks but won't start now.

 

[Stivino]

I believe that all Hyundai engines are interference engines.

 

[Burnerman]

Errr woe is me and you!
I’d be very surprised if the engine is a free wheeler......time to shift the rocker cover and see if the chain is still there.
John

 

[DIYspanner]

Took the cover and although the chain is still on the sprockets.

o/s wheel up and in 1st gear, when I rotated the engine, even with the plugs out, it was stuck. I tried turning the engine backwards and the chain jumped on the rear sprocket although I could rotate it forward.

Chances are there's valve damage and possibly piston crown damage so requiring a head off job and possible block job.

 

[Burnerman]

It sounds like the chain tensioner / guides or whatever have called it a day and locked things up down below.
Where are you going from here?

 

[DIYspanner]

Where are you going from here?

Considering options!
I could try fitting a new timing chain, provided I can align the shafts that is, then do a compression test to see if any valves are bent. If any are bent, then the head has to come off.

It maybe its owner decides to send it to the breakers and put the money into a new motor.

 

[Burnerman]

Personally - and I know you have a heart like a lion - I’d bale out from this one and run a mile!
John

 

[DIYspanner]

Personally - and I know you have a heart like a lion - I’d bale out from this one and run a mile!
John

I, like you John, am conscientious. I could return the engine to as new status, sinking a lot of pennies in the process but I consider the pennies better spent on an upgrade. The bits and bobs for the i20 could total to half the car's value.

As always, you're input is valued. Thanks!

 

[Old Salt]

I would take the head off and take a look at any possible damage before spending out on a new chain.

 

[DIYspanner]

I would take the head off and take a look at any possible damage before spending out on a new chain.

Taking the head off, I believe, would the only way to get the crank and two cam shafts aligned again to even consider putting new chain on. However, if there are any bent valves, there may well be dents in some of the pistons too.

I'll mull it over.

 

[Stivino]

I don't think you'll be able to resist the temptation of taking it off. I wouldn't be able to.

 

[DIYspanner]

I don't think you'll be able to resist the temptation of taking it off. I wouldn't be able to.

Indeed, its tempting. Yet a visual inspection may not reveal a bent valve if its only a slight bend, not enough to see by eye yet enough to prevent a gas tight seal on its seat. Having said that, a mark on a piston may reveal a clash.

 

[Stivino]

When it's a catastrophic fail, it's usually obvious enough.

 

[DIYspanner]

If the head were to come off, the timing chain cover has to be removed anyway.

 

[Burnerman]

Not a bad job with the engine on the bench.....bloody horrible with it in the car
Just regarding the valves.....I had a belt snap on a Golf 16v a long time ago. Two valves had obvious damage, cylinder number 3. On replacing those two, the valves opened and closed fine on the bench.....petrol down the ports showed no leaks.
Piston crown damage was negligible.
However, when back on the car, almost every valve stuck in the guides when it got nice and hot so another 14 valves needed!
Took me by surprise, that one.
John