- Audi
- Chery
- Chevrolet
- Citroen
- Daewoo
- Fiat
- Ford
- Geely
- Honda
- Hyundai
- Kia
- Lifan
- Mazda
- Mercedes
- Mitsubishi
- Nissan
- Opel
- Peugeot
- Renault
- Skoda
- Subaru
- Suzuki
- Toyota
- Volvo
- VW
- Vaz
Why does the valve bend when the timing is broken?
The valve mechanism works as follows: at the moment the piston reaches top dead center, both valves in the combustion chamber are closed - a certain pressure is created in it. Broken belt leads to the fact that valve do not have time to close in time before the arrival of the piston. so, their meeting appears - a collision, which precisely leads to the fact that the valve bends. Previously, in order to prevent such a problem, special valve grooves were made on old ICEs. On the new generation of internal combustion engines, similar recesses are also found, but they are intended only to avoid deformation of the valves during the operation of the internal combustion engine and in the event of a belt break, they absolutely do not save.
From a physical point of view, from the moment the timing belt breaks, the camshafts immediately stop, under the action of return springs that slow down its cams. At this moment, the crankshaft inertially continues its rotational movement (regardless of whether the gear was engaged or not, the revolutions were low or high, the flywheel continues to turn it). That is, the pistons continue to work, and as a result, they hit the valves that are open at that moment. Quite rare, but it happens when the valves damage the piston itself.
Causes of a broken timing belt
- wear of the belt as such or its poor quality (shaft gears have sharp edges or oil ingress from the oil seals).
- crankshaft wedges.
- the pump wedges (the most common occurrence).
- several or one camshaft wedges (for example, due to the deterioration of one of them - however, here the consequences are slightly different).
- the tension roller is unscrewed or the rollers are wedged (the belt loosens or tightens).
Modern engines, since they are more powerful than their predecessors, have much less survivability. If we consider the cause, relying on the valves, this problem appears due to the small distance between them and the piston. That is, if at the moment the piston arrives, the valve is ajar, then it instantly bends. Since for greater compression and compression in the bottom of the piston there is no groove under the valve of the required depth.
On which ICEs does the valve bend?
On machines with an 8-valve ICE, it bends the least, but 16 and 20 cells, whether it be gasoline or diesel, the bend occurs in most cases. True, sometimes it can be one or more valves, and if the internal combustion engine worked at idle, then the trouble will carry over. But such cases are few, mostly, the consequences are irreversible. A table with a list of ICEs on which the valves of all popular cars bend when the timing belt breaks.
TOYOTA
| Internal combustion engine | Oppression | Internal combustion engine | Does not bend |
| 1S | oppression | Camry V10 2.2GL | not oppressed |
| 2S | oppression | 3VZ | not oppressed |
| 2E | oppression | 1S | not oppressed |
| 3S-GE | oppression | 2S | not oppressed |
| 3S GTE | oppression | 3S FE | not oppressed |
| 3S-FSE | oppression | 4S FE | not oppressed |
| 4A-GE | oppression (does not bend at idle) | 5S FE | not oppressed |
| 1G-FE VVT-i | oppression | 4A-FHE | not oppressed |
| G-fe beams | oppression | 1G-EU | not oppressed |
| 1JZ-FSE | oppression | 3A | not oppressed |
| 2JZ-FSE | oppression | 1JZ-GE | not oppressed |
| 1MZ-FE VVT-i | oppression | 2JZ-GE | not oppressed |
| 2MZ-FE VVT-i | oppression | 5A-FE | not oppressed |
| 3MZ-FE VVT-i | oppression | 4A-FE | not oppressed |
| 1VZ-FE | oppression | 4A-FE LB | does not bend (lean burn) |
| 2VZ-FE | oppression | 7A-FE |
| 3VZ-FE | oppression | 7A-FE LB | does not bend (lean burn) |
| 4VZ-FE | oppression | 4E-FE | not oppressed |
| 5VZ-FE | oppression | 4E-FTE | not oppressed |
| 1SZ-FE | oppression | 5E-FE | not oppressed |
| 2SZ-FE | oppression | 5E-FHE | not oppressed |
| 1G-FE | not oppressed |
| 1G-GZE | not oppressed |
| 1JZ-GE | does not bend (in practice it is possible) |
| 1JZ-GTE | not oppressed |
| 2JZ-GE | does not bend (in practice it is possible) |
| 2JZ-GTE | not oppressed |
| 1MZ-FE type'95 | not oppressed |
| 3VZ-E | not oppressed |
SUZUKI
| Internal combustion engine | Does not bend |
| G16A (1.6l 8 valve) | not oppressed |
| G16B (1.6 l 16 kl.) | not oppressed |
DAEWOO
| Internal combustion engine | Oppression | Internal combustion engine | Does not bend |
| Lanos 1.5 | oppression | Lanos, Sens 1.3 | not oppressed |
| Lanos 1.6 | oppression | Nexia 1.6. 16 Uzbek. | not oppressed |
| Matiz 0.8 | oppression and also a guide for replacement | Nexia 1.5. 8 (Euro-2 G15MF auto until 2008) | not oppressed |
| Nexia A15SMS (Euro-3, after 2008) | oppression |
| Nubira 1,6л. DOHC | oppression |
CHEVROLET
| Internal combustion engine | Oppression |
| Aveo 1.4 F14S3, 8 cells | oppression |
| Aveo 1.4 F14D3 16kl. | oppression |
| Aveo 1.6 | oppression |
| Aveo 1.4 F14S3 | oppression |
| Lacetti 1,6л. и 1,4л. | oppression |
| Captiva LT 2,4 л. | oppression |
CITROEN
| Internal combustion engine | Oppression |
| Citroen Xantia (Citroen Xantia) XU10J4R 2.0 16kl | oppression |
| Citroen ZX 1.9 and 2.0 (diesel) | oppression |
| Citroen C5 2.0 136 .с. | oppression |
| Citroen C4 1.6i 16V | oppression |
| Citroen jumper 2.8 НDI | oppression |
| Citroen Berlingo 1.4 and 1.6 | oppression |
| Citroen Xsara 1.4 TU3JP | oppression |
HYUNDAI
| Internal combustion engine | Oppression |
| Getz 1.3 12кл | oppression |
| Getz 1.4 16кл | oppression |
| Accent SOHC 1.5 12V and DOHC 1.5 16v | oppression |
| H 200, D4BF | oppression |
| Elantra, G4FC | oppression |
| Sonata, 2.4l | oppression |
VAZ
| Internal combustion engine | Oppression | Internal combustion engine | Does not bend |
| 2111 1.5 16cl. | oppression | 2111 1.5 8cl. | not oppressed |
| 2103 | oppression | 21083 1.5 | not oppressed |
| 2106 | oppression | 21093, 2111, 1.5 | not oppressed |
| 21091 1.1 | oppression | 21124, 1.6 | not oppressed |
| 20124 1.5 16v | oppression | 2113, 2005 1.5 eng., 8 cl. | not oppressed |
| 2112, 16 valves, 1.5 | oppression (with stock pistons) | 11183 1.6 l 8 cl. "Standard" (Lada Granta) | not oppressed |
| 21126, 1.6 | oppression | 2114 1.5, 1.6 8 cl. | not oppressed |
| 21128, 1.8 | oppression | 21124 1.6 16 cl. | not oppressed |
| Lada Kalina Sport 1.6 72kW | oppression |
| 21116 16 cells. "Norma" (Lada Granta) | oppression |
| 2114 1.3 8 cells and 1.5 16 cells | oppression |
| Lada Largus K7M 710 1,6l. 8cl. and K4M 697 1.6 16 cl. | oppression |
| Levels 1,7l. | oppression |
RENAULT
| Internal combustion engine | Oppression |
| Logan, Clio, Clio 2, Laguna 1, Megane Classic, Kangoo, Symbol | oppression (in most cases) |
| K7J 1.4 8kl | oppression |
| K4J 1.4 16 cl. | oppression |
| F8Q 622 1.9D | oppression |
| 1.6 16V K4M | oppression |
| 2.0 F3R | oppression |
| 1.4 RXE and all engines reno both 8 and 16 cells. | oppression |
| Master g9u720 2,8 (diz.) | oppression |
VOLVO
| Internal combustion engine | Oppression |
| S40 1.6 (belt) | oppression |
| DO NOT 740D | oppression (breaks the camshaft and pushers) |
Kia
| Internal combustion engine | Oppression | Internal combustion engine | Does not bend |
| Spectra 1.6 | oppression | 4EA | not oppressed |
| Rio A3E 1343cm3 8cl. A5D 1,4 l., 1,5 l. 1.6cl. | oppression |
| Magentis(Majestic) G4JP 2l. | oppression |
| Serato, Spectra 1.6 16v | oppression |
| Seed (Sid) 1.4 16kl. | oppression |
Fiat
| Internal combustion engine | Oppression |
| Brava 1600 cm3 16 cl. | oppression |
| Tipo and Tempra 1.4, 8 valves. and 1.6 l | oppression (in rare cases they do not bend) |
| Tipo and Tempra 1.7 diesel | oppression |
| Ducato 8140 | oppression (breaks rocker) |
| Ducato F1A | oppression |
Mercedes
| Internal combustion engine | Oppression |
| 271 motor | oppression |
| W123 615,616 (petrol, diesel) | oppression |
Peugeot
| Internal combustion engine | Oppression | Internal combustion engine | Does not bend |
| 307 TU5JP4 1.6 | oppression | 607 2.2 hdi 133 hp | does not oppress (but breaks the rocker, the car stalls without any noise) |
| 206 TU3 1.4 | oppression | Boxer 4HV, 4HY | does not oppress (but breaks the rocker) |
| 405 1,9 l. benz | oppression |
| 407 PSA6FZ 1,8л. | oppression |
Honda
| Internal combustion engine | Oppression | Internal combustion engine | Does not bend |
| Agreement | oppression | Civic В15Z6 | not oppressed |
| D15B | oppression |
Ford
| Internal combustion engine | Oppression | Internal combustion engine | Does not bend |
| zets 1.8 л | oppression | zets 2.0 л | not oppressed |
| Focus II 1.6l. 16v | oppression | Sierra 2.0 CL OHC 8 cl. | not oppressed |
| Mondeo 1.8 GLX 16 cl. | oppression + hydraulic lifters jams |
Geely
| Internal combustion engine | Oppression | Internal combustion engine | Does not bend |
| Geely Emgrand EC7 1.5 JL4G15 1.8 JL4G18 CVVT | oppression | Geely CK/MK 1.5 5A-FE | not oppressed |
| Geely MK 1.6 4A-FE | not oppressed |
| Geely FC 1.8 7A-FE | not oppressed |
| Geely LC 1.3 8A-FE | not oppressed |
Mitsubishi
| Internal combustion engine | Oppression | Internal combustion engine | Does not bend |
| 6g73 2.5 GDI | oppression (does not oppress at low speeds) | Pajero 2 3.0 l 12 cells | not oppressed |
| 4G18, 16 valves, 1600cm2 | oppression |
| Airtrek 4G63 2.0L Turbo | oppression |
| Charisma 1.6 | oppression |
Nissan
| Internal combustion engine | Oppression | Internal combustion engine | Does not bend |
| Nissan Cefiro А32 VQ20DE | oppression | RB VG AND CA | not oppressed |
| Nissan Primera 2.0D 8 kl. | oppression |
| Nissan Skyline RB25DET NEO | oppression, and the RB20E breaks the rocker |
| Nissan Sunny QG18DD NEO | oppression |
VAG (Audi, VW, Skoda)
| Internal combustion engine | Oppression | Internal combustion engine | Does not bend |
| ADP 1.6 | oppression | 1,8 RP | not oppressed |
| Polo 2005 1.4 | oppression | 1,8 AAM | not oppressed |
| Conveyor T4 ABL 1.9 l | oppression | 1,8 FP | not oppressed |
| GOLF 4 1.4/16V AHW | oppression | 1,6 EZ | not oppressed |
| PAST 1.8 л. 20V | oppression | 2,0 2E | not oppressed |
| Passat B6 BVY 2,0FSI | oppression + breaks valve guides | 1,8 PL | not oppressed |
| 1,4 VSA | oppression | 1,8 AGU | not oppressed |
| 1,4 BUD | oppression | 1,8 EV | not oppressed |
| 2,8 AAA | oppression | 1,8 ABS | not oppressed |
| 2,0 9A | oppression | 2,0 JS | not oppressed |
| 1,9 1Z | oppression |
| 1,8 CR | oppression |
| 1,4 BBZ | oppression |
| 1,4 USA | oppression |
| 1,4 VSA | oppression |
| 1,3 MN | oppression |
| 1,3 HK | oppression |
| 1,4 AKQ | oppression |
| 1,6 ABU | oppression |
| 1,3 NZ | oppression |
| 1,6 B.F.Q. | oppression |
| CS 1,6 | oppression |
| 1,6 AEE | oppression |
| 1,6 AKL | oppression |
| 1,6AFT | oppression |
| 1.8 AWT | oppression |
| 2,0 BPY | oppression |
Opel
| Internal combustion engine | Oppression | Internal combustion engine | Does not bend |
| X14NV | oppression | 13S | not oppressed |
| X14NZ | oppression | 13N/NB | not oppressed |
| C14NZ | oppression | 16SH | not oppressed |
| X14XE | oppression | C16NZ | not oppressed |
| X14SZ | oppression | 16SV | not oppressed |
| C14 SE | oppression | X16SZ | not oppressed |
| X16NE | oppression | X16SZR | not oppressed |
| X16XE | oppression | 18E | not oppressed |
| X16XEL | oppression | C18NZ | not oppressed |
| C16 SE | oppression | 18 SEH | not oppressed |
| Z16XER | oppression | 20 SEH | not oppressed |
| C18XE | oppression | C20NO | not oppressed |
| C18 XEL | oppression | X20SE | not oppressed |
| C18XER | oppression | Cadet 1,3 1,6 1,8 2,0 l. 8cl. | not oppressed |
| C20XE | oppression | 1.6 if 8 cells. | not oppressed |
| C20FLY | oppression |
| X20XEV | oppression |
| Z20LEL | oppression |
| Z20LER | oppression |
| Z20LEH | oppression |
| X22XE | oppression |
| C25XE | oppression |
| X25X | oppression |
| Y26SE | oppression |
| X30XE | oppression |
| Y32SE | oppression |
| Corsa 1.2 8v | oppression |
| Cadet 1,4 l | oppression |
| all 1.4, 1.6 16V | oppression |
Lifan
| Internal combustion engine | Does not bend |
| LF479Q3 1,3l. | not oppressed |
| Tritec 1,6л. | not oppressed |
| 4A-FE 1,6л. | not oppressed |
| 5A-FE 1,5l. and 1,8 liters. 7A-FE | not oppressed |
Chery
| Internal combustion engine | Oppression |
| Tiggo 1,8л., 2,4л. 4G64 | oppression |
| Amulet SQR480ED | oppression + rocker arms break |
| A13 1.5 | oppression |
Mazda
| Internal combustion engine | Oppression | Internal combustion engine | Does not bend |
| E 2200 2,5l. dis. | oppression | 323f 1,5 liters. Z5 | not oppressed |
| 626 GD FE3N 16V | oppression | Xedos 6, 2,0л., V6 | not oppressed |
| MZD Capella (Mazda Capella) FE-ZE | not oppressed |
| F2 | not oppressed |
| FS | not oppressed |
| FP | not oppressed |
| KL | not oppressed |
| KJ | not oppressed |
| ZL | not oppressed |
Subaru
| Internal combustion engine | Oppression | Internal combustion engine | Does not bend |
| EJ25D DOHC and EJ251 | oppression | EJ253 2.5 SOCH | does not oppress (only if idling) |
| EJ204 | oppression | EJ20GN | not oppressed |
| EJ20G | oppression | EJ20 (201) DOHC | not oppressed |
| EJ20 (202) SOHC | oppression |
| EJ 18 SOHC | oppression |
| EX 15 | oppression |
How to find out if the valve bends?
Checking the internal combustion engine if the valves are bent after a timing break
In this matter, neither a visual inspection nor the numbers given in the "valve bend" tables will help you. Even if you have in your hands information from the manufacturer about damage in the event of a broken belt, it is not known how reliable it is.
If you want to check for the possibility of bending the valves by the piston when the timing belt breaks, you need to remove the belt, set the first piston at TDC, turn the camshaft 720 degrees.
If everything went well and he did not rest, you can continue to check - go to the second piston. When everything is fine there, then a possible broken belt will not lead to negative consequences for the internal combustion engine of your car.
In order to avoid this problem (bend of the valves in the event of a break), you must constantly monitor the condition and tension of the timing belt. When the slightest unfamiliar noise appears during operation, you should immediately try to find out the cause of its occurrence, inspect the condition of the rollers and the pump.
When buying a used car, replace the timing belt immediately, no matter what the dealer tells you. And then such an urgent question as does the valve bend when it breaks You will not be disturbed.
Bent valve signs
When the belt broke, then simply changing the timing belt, hoping that everything went without consequences and you start the engine, is not worth it. Especially if the internal combustion engine is on the list of those on which the valve bends. Yes, there are times when the bend was not large and several valves no longer fit snugly in the saddle, then you can turn the starter, but often such actions will also aggravate the situation more. Since with minor damage everything will work and spin, however, the internal combustion engine will shake, and the consequences will only worsen.
It is best if you remove the "head" in order to check this visually or fill in kerosene, however, there are several ways to check if the valve is bent without disassembling the internal combustion engine.
The main symptom if the valves are bent - small or completely no compression. Therefore, you need to measure the compression in the cylinders. But, such actions are relevant if the crankshaft can be turned and nothing rests anywhere. So the first thing to do is to install a new belt, manually, by the bolt on the HF, scroll the entire gas distribution mechanism a few turns (you need to unscrew the candles at the same time).
How to check if a valve is bent
in order to determine whether some valve stem has bent, literally five turns of manual turning with a key on the crankshaft bolt will be enough. If the rods are intact, then the rotation will be free, bent - heavy. And also there should be clearly tangible 4 points (at one revolution) of resistance to the movement of the pistons. If such resistance is not noticeable, then screwing the candles back, unscrew them one by one and turn the crankshaft again.
By the force of manual torsion, with one of the candles missing, it is relatively easy to understand in which particular cylinder the valve(s) were bent. However, this method will not always be able to help you accurately find out if the valve is bent or not.
If the crankshaft turns freely, then you can check with a compression gauge. Is there no such tool? Means perform pneumotest, moreover, checking the tightness of the cylinders is the most correct way, which will give an answer on how the valve plates fit in the saddles, without additional consequences when scrolling with the starter and without installing a new belt.
How to check if the valve itself is bent?
For pneumotest, you do not need to pull the car to the service station, you yourself can find out whether the cylinder is tight or not. Easiest:
- pick up a piece of hose according to the diameter of the candle well;
- unscrew the candle;
- set the cylinder piston to top dead center (valves closed) one by one;
- insert the hose tightly into the well;
- you try with all your might to blow into the combustion chamber (air passes - bent, does not pass - “swept through”).
The same test can be performed using a compressor (even a machine one). True, you will have to spend a little more time, as you need to prepare. Drill out the central electrode in the old candle, and put a hose on the ceramic tip (fixing it well with a clamp). Then pump pressure into the cylinder (provided that the piston in it is at TDC).
By hissing and by pressure on the pressure gauge, it will be clear whether the valve hats are sitting in the saddles or not. Moreover, depending on where the air goes, determine the inlet or outlet bent. When the exhaust is bent, air goes into the exhaust manifold (muffler). If the intake valves are bent, then into the intake tract.
