Non-interference engine, broken rocker arms.

[NICAT]

My Car's engine (G15MF) is famous for being non-interference compared to A15SMS (interference) engines which are also installed in the same model cars. So once the timing belt is broken, pistons won't reach to valves.
But i remember, once i used water as a coolant when my radiator was leaking, and water pump was frozen at night.
When i tried to start the engine several times, i heard some metallic sound.
when the mechanic opened the engine, he found out that timing belt's teeth were worn out, and 4 of 8 rocker arms are broken.
Both me and the mechanic were surprised that how can this be possible.


Now i see some people claims that it is possible to install cylinder heads from A15SMS, to G15MF. This make me think that whether my engine also have a wrong clinder head which makes it no more non-interference ?
Or any other reason why rocker arms should be broken when timing belt is worn. May be just a coincidence ?
Regards

 

[JC1]

Were you the person driving the car when the timing belt broke? What speed were you driving and what traffic conditions (i
High speed or in heavy traffic etc).

What is the age and mileage of the vehicle?

If some teeth broke off a gear I'm thinking the bearings failed because something caused those sprockets to rotate under tension. I guessing it wasn't just a simple break of the belt.

Car is a Daewoo? What was the oil level in the engine during this failure?

I'm no expert on why it failed. Just trying to get more information.

 

[Ducked]

Originally Posted By: JC1
Were you the person driving the car when the timing belt broke? What speed were you driving and what traffic conditions (i
High speed or in heavy traffic etc).

What is the age and mileage of the vehicle?

If some teeth broke off a gear I'm thinking the bearings failed because something caused those sprockets to rotate under tension. I guessing it wasn't just a simple break of the belt.

Car is a Daewoo? What was the oil level in the engine during this failure?

I'm no expert on why it failed. Just trying to get more information.


Man, you ask a lot of questions, most of which are answered in the OP and/or seem to be irrelevent.

As described, the water pump was probably frozen solid and therefore wouldn't move. Assuming its got a staionary toothed drive pulley, and the engine (or if it didn't start, the starter motor) pulls the timing belt across it, that'll strip the rubber teeth off the belt.

Have to admit I can't think of a reason whu the rocker arms would break on a non-interference engine though. Hydraulic tappets might not work with very cold oil but that shouldnt break anything, so maybe it isn't a non-interference engine.

If it is, OK, maybe some of your seemingly irrelevent questions will turn up a clue.

 

[NICAT]

Originally Posted By: JC1
Were you the person driving the car when the timing belt broke? What speed were you driving and what traffic conditions (i
High speed or in heavy traffic etc).

What is the age and mileage of the vehicle?

If some teeth broke off a gear I'm thinking the bearings failed because something caused those sprockets to rotate under tension. I guessing it wasn't just a simple break of the belt.

Car is a Daewoo? What was the oil level in the engine during this failure?
Thanks for replies

I'm no expert on why it failed. Just trying to get more information.


Mileage Was 1M Km.
Timing belt didn't broke while driving. it was broken when i was trying to start up the frozen engine. (water pump)

I am sorry that i have forgotten to note this. Oil level was too low. top of the dipstick was hardly reaching to the oil. (actually the engine burnt oil more than i expected. i checked the oil level a day before, it was normal. but driving 400km to another city burnt whole oil seemingly)

Regards

 

[JC1]

Originally Posted By: Ducked
Originally Posted By: JC1
Were you the person driving the car when the timing belt broke? What speed were you driving and what traffic conditions (i
High speed or in heavy traffic etc).

What is the age and mileage of the vehicle?

If some teeth broke off a gear I'm thinking the bearings failed because something caused those sprockets to rotate under tension. I guessing it wasn't just a simple break of the belt.

Car is a Daewoo? What was the oil level in the engine during this failure?

I'm no expert on why it failed. Just trying to get more information.


Man, you ask a lot of questions, most of which are answered in the OP and/or seem to be irrelevent.

As described, the water pump was probably frozen solid and therefore wouldn't move. Assuming its got a staionary toothed drive pulley, and the engine (or if it didn't start, the starter motor) pulls the timing belt across it, that'll strip the rubber teeth off the belt.

Have to admit I can't think of a reason whu the rocker arms would break on a non-interference engine though. Hydraulic tappets might not work with very cold oil but that shouldnt break anything, so maybe it isn't a non-interference engine.

If it is, OK, maybe some of your seemingly irrelevent questions will turn up a clue.


Sorry I ask a lot of questions. I didn't see the part about the broken water pump. Now I re-read that. I guess if I was a doctor is be scorned for not throwing a bunch of pills at the patient hoping to band aid a solution. Lol.

OP says Oil level was low, sounds like engine maybe have had problems as well with inadequate lubrication. Also says mileage is 1M km (is that million)?

Happy camping, the doctor has left this post.

 

[NICAT]

Well, Today i called the previous owner asking "Have you ever replaced its cylnder head"? He told: "Yes i did, Replace your timing belt regularly"

So the engine is no more non-interference.
I should had called him before posting here. I am very sorry for taking your time.

 

[JC1]

Originally Posted By: NICAT
Well, Today i called the previous owner asking "Have you ever replaced its cylnder head"? He told: "Yes i did, Replace your timing belt regularly"

So the engine is no more non-interference.
I should had called him before posting here. I am very sorry for taking your time.


No problem. That's what learning is all about. Are you going to fix this motor?