Timing Belt Broke And Can't Find Timing Marks

[tirantha2]

as one of the earlier models to use light weight stuff and weights around 1000kg. Its a sub compact sedan, so not that lengthy. Does around 12 with spirited driving. Major issue wit

Edited August 9, 2014 by tirantha2

[Nilantha]

can you please take some pictures of injector pump and post here?

[Scooter]

Does this video help? I think the Vauxhall motor here is a bigger version of the 1.5 Isuzu diesel you have in your car. If I'm wrong, sorry.

[terrabytetango]

The Opel/Vauxhall Corsa A came with the same engine. Google Corsa 1.5 Diesel and you're bound to get hits. Also, are you attempting to replace the timing belt yourself?

[tirantha2]

Does this video help? I think the Vauxhall motor here is a bigger version of the 1.5 Isuzu diesel you have in your car. If I'm wrong, sorry.

Thank you

The Opel/Vauxhall Corsa A came with the same engine. Google Corsa 1.5 Diesel and you're bound to get hits. Also, are you attempting to replace the timing belt yourself?

Thank you , Finally I manage to get timing marks and start up engine, but the problem is Diesel injector pump too noisy because of advance I think,and also engine is missing , I checked while runing engine remove disel connection one by one then 4th cylinder is not firing properly....

I dont have anyclue about that...?

[NZer]

May be a bent valve ?

[terrabytetango]

Thank you

Thank you , Finally I manage to get timing marks and start up engine, but the problem is Diesel injector pump too noisy because of advance I think,and also engine is missing , I checked while runing engine remove disel connection one by one then 4th cylinder is not firing properly....

I dont have anyclue about that...?

Get the fuel pump properly aligned, and then check if the engine miss is still there. If so, get the injector in the 4th cylinder inspected.

[NZer]

Its got to be a bent valve. The engine was firing well before the timing belt broke off. So after replacing it then it should work as usual. The reason its missing is cos of a bent valve.

[Scooter]

Think this motor has what they call an interference set-up. Means that when a timing belt breaks the vales and the piston can collide. Could very well be a bent valve you have here. Run a compression test before going to rip off the head. That will give you a good idea as to whether you have a valve/piston top issue. Good luck.

[NZer]

Think this motor has what they call an interference set-up. Means that when a timing belt breaks the vales and the piston can collide. Could very well be a bent valve you have here. Run a compression test before going to rip off the head. That will give you a good idea as to whether you have a valve/piston top issue. Good luck.

It is an interference set up, thats why i said its a bent value, Your bang on the buck.

[Scooter]

Yup, NZ, reckon you're right. Bent valve a big possibility. Compression test will show up the dogy cylinder/s but once the head is off (if it has to) might as well recon the entire head. Bugger.

[terrabytetango]

I have isuzu gemini jt600 and my car timing belt broke due to valve hit on piston,Remove engine head and replace with new valves.

He has already replaced the valves.

[Scooter]

Point taken, Terra. All new valves, Tiran?

[harshansenadhir]

point to ponder : although the valves are new, the valves got bent by colliding with the piston.

Chances are

1. Piston/Pistons got damaged (sometimes valves can poke through piston top)

2. Connecting rods also slightly bent. This is very tricky as it's really tough to determing a slightly bent connecting rod.

[The Don]

point to ponder : although the valves are new, the valves got bent by colliding with the piston.

Chances are

1. Piston/Pistons got damaged (sometimes valves can poke through piston top)

2. Connecting rods also slightly bent. This is very tricky as it's really tough to determing a slightly bent connecting rod.

Harshan, isn't there a possibility of cylinder head damage here as well which might cause the valves to operate as normal? My hunch is it is either that or the timing is slightly off.

[terrabytetango]

Unless bits of valve or piston broke off and impacted on the con rods, I doubt they're damaged. However, at this point we need more detail from the OP before speculating any further. I'm assuming the heads and pistons were inspected when the valves were replaced.

[harshansenadhir]

Harshan, isn't there a possibility of cylinder head damage here as well which might cause the valves to operate as normal? My hunch is it is either that or the timing is slightly off.

you mean the valve seats or the entire head? valve seats and combustion chamber can damage by broken valves if the engine was running at a higher rpm when this happened. However, I'm sure those would've inspected when the engine has been re-assembled and a proper head crack detection test was done.

the same thing happened in 4G15 engine of the Lancer. Luckily, only one piston has knocked with valves. I've changed all valves and piston + connecting rod of the piston which got knocked with valves.

Unless bits of valve or piston broke off and impacted on the con rods, I doubt they're damaged. However, at this point we need more detail from the OP before speculating any further. I'm assuming the heads and pistons were inspected when the valves were replaced.

how valves bent is when the piston moves up and hits the valve which was pushed towards combustion chamber. What moves piston is the crank + ply wheel and if the vehicle was running, the power of rolling motion of the wheels also would turn the crank. Piston cannot move further upward coz the valve is stuck but it tries to push upwards because crank still rotates as I said earlier.

this power then causes in

1. bending valves

2. bending connecting rod

3. Damaging piston

4. Damaging crank shaft

5. Damaging the head

in the above severity order.

[terrabytetango]

Interesting, I thought it would be piston then con rod.

[harshansenadhir]

Interesting, I thought it would be piston then con rod.

Bending of the connecting rod would happen at the point of the sudden stop of the piston movement. If it further presses, then the piston would get damaged.