Engine 1.2 TSI, installed on Skoda Yeti in the period from 2009 to 2018, is one of the most common power units in the line of the Czech brand. Despite its compactness and efficiency, this engine requires special attention to the gas distribution system. Owners often face the problem of stretching metal chain, which can lead to critical consequences for the engine.
Ignoring wear symptoms leads not just to extraneous sounds, but to actual failure of the piston group. On engines of the CBZB and CAXA series, the chain can stretch already by 60,000β80,000 km., which is significantly lower than the standards stated by the manufacturer. Timely diagnosis and replacement of the timing belt kit is the only way to preserve the life of a turbocharged engine and avoid costly overhauls.
Why does the 1.2 TSI timing chain stretch so quickly?
The main reason for early wear is the design feature of the chain tensioner used in early versions of engines. Hydraulic tensioner has insufficient stroke and is often unable to compensate for chain elongation at low temperatures or when there is insufficient oil pressure. As a result, the gaps in the system increase and the teeth begin to jump.
The second factor is the quality of the oil used. Engines family EA111 extremely sensitive to the viscosity and chemical composition of lubricants. Use of non-original oils with tolerances different from the specifications VW 504.00 / 507.00, accelerates wear asterisks and guides. This is especially true for short city trips, when the engine does not have time to warm up to operating temperature.
The quality of the metal of the chain itself cannot be discounted. Cheap analogues, which are often installed during previous repairs, have lower hardness and lose their geometric parameters faster. If you are considering a replacement, it is important to understand that components must be of high quality, otherwise the problem will return after a couple of thousand kilometers.
Symptoms of wear: how to understand that itβs time to go to a service center
The first and surest sign of problems is a characteristic metallic ringing or crackling sound when starting a cold engine. This sound appears for 2-3 seconds and disappears as soon as the oil pump creates pressure in the system and the chain tensioner begins to operate. If you hear this sound, delay repairs. absolutely not possible.
Another symptom could be an error on the dashboard. On-board computer Skoda records the desynchronization of the shafts and issues an error code indicating a mismatch in the valve timing. This is often accompanied by a light coming on. Check Engine and the engine going into emergency mode with loss of power.
- π Loud metallic knocking noise on cold start, lasting 1-3 seconds
- π¨ Lamp lights up Check Engine with error codes by phase (P0016, P0017)
- βοΈ Unstable engine operation at idle and failures during acceleration
- π’οΈ Increased oil consumption, which cannot be explained by natural waste
Choosing a kit: original or high-quality analogue?
When selecting spare parts for Skoda Yeti 1.2 TSI there are two main ways: purchasing an original kit from the concern Volkswagen or selection of certified analogues. The original kit usually includes an updated tensioner with an improved design, which is critical to eliminating a factory defect.
Many owners choose brands INA, Gates or Febi Bilstein, since they are often suppliers to the conveyor. However, it is important to check the part number for the upgrade. Old versions of tensioners may simply not solve the problem, but only delay its occurrence. Before purchasing, you must check the vehicle's VIN code with the catalog number of the spare part.
| Component | Original (VW) | High-quality analogue | Features |
|---|---|---|---|
| Timing chain | 03C 109 119 H | INA 530 0382 10 | The old tensioner often comes with the chain |
| Tensioner | 03C 109 473 K | Gates T43148 | New version with improved valve |
| Shoes (guides) | 03C 109 469 A | Febi 26786 | Low quality plastic breaks quickly |
| Camshaft sprocket | 03C 109 101 E | INA 530 0382 10 | Replacement required when chain stretches |
- Less than 50,000 km
- 50,000 - 100,000 km
- More than 100,000 km
- The chain hasn't been replaced yet
Preparation for replacement and necessary tools
The process of replacing the timing chain on the 1.2 TSI engine requires the removal of the right fender, bumper and fender liner, since access to the drive mechanisms is only from the passenger side. This is not the easiest procedure, requiring accuracy and special tools. Without special shaft clamps, the risk of phase failure during assembly is extremely high.
You will need a socket set, a torque wrench to tighten the bolts to a specific torque, and a crankshaft pulley puller. Pay special attention to the condition of the crankshaft oil seals, since their replacement is often required during pulley dismantling. Use original sealant for all joints.
βοΈ Preparing to replace the chain
It is important to prepare the work site: the engine must be clean so that dirt does not get inside the mechanism during disassembly. It is recommended to pre-warm the engine to operating temperature so that the oil becomes more liquid and it is easier to drain it from the sump, if necessary to access some elements.
Before starting work, be sure to disconnect the negative terminal of the battery to avoid short circuits when removing electrical connectors.
Step-by-step instructions for replacing the chain
The first step is to remove the plastic guards and the attachment's belt drive. Removal of the generator and air conditioning compressor is often required to gain full access to the timing belt area. The crankshaft must be rotated strictly clockwise, using a special tool in the seat under the pulley.
After removing the crankshaft pulley and the upper timing cover, you need to fix the camshafts. Use clamps that fit onto the back of the shafts. Then check the marks on the gears and chain. If the marks match, but the chain sags, this confirms its stretching. Now you can unscrew the tensioner and the old shoes.
β οΈ Attention! Do not turn the crankshaft under any circumstances after removing the chain, so as not to bend the valves. The camshafts must be secured until a new chain is installed.
Installing a new chain requires extreme precision. First, the chain is put on the crankshaft sprocket, then on the camshaft sprockets. Make sure the color marks on the chain line up perfectly with the marks on the gears. Only after this can a new tensioner and clamps be installed.
How to check if the installation is correct?
After assembly, you must manually turn the crankshaft two full turns and make sure that the marks match again and the engine rotates without jamming.
The camshaft and crankshaft pulley bolts are tightened to the torque specified in the technical documentation. Typically this is 90 Nm plus a 90 degree turn for the crankshaft bolt. Do not neglect the torque wrench, as overtightening can lead to thread breakage, and undertightening can lead to the pulley unscrewing while moving.
It is critical to install a new chain tensioner, as the old one may not work and provide the proper tension.
Check after assembly and running-in
After all the nodes are assembled and the covers are installed, it is necessary to check the tightness of the connections. Pour fresh oil and start the engine. The first seconds of operation should be quiet - the lack of a tensioner sound indicates the correct installation. Check for no errors with the scanner.
The first 500-1000 km of run after replacement is recommended to observe a gentle mode of operation. Avoid sharp accelerations and high revs to let new details get lost. Watch the oil level and engine temperature. Any extraneous sounds during this period require immediate stop and check.
- β Make sure there are no oil leaks from under the timing system cover
- π§ Check for no errors in the engine control unit
- π‘οΈ Control the temperature of the coolant on your first trip
- π Listen to the engine in different modes to eliminate noise
β οΈ Attention! If after replacing the circuit on the cold engine a knock is heard, immediately turn off the engine. This could mean that the chain is installed incorrectly or the tensioner has not worked.
Cost of work and common mistakes during repairs
Replacing the timing chain with Skoda Yeti 1.2 TSI is a time-consuming procedure requiring qualifications. The cost of working in specialized services can vary depending on the region and the complexity of access to the engine. On average, the work itself takes from 6 to 10 hours, which is reflected in the final price.
A common mistake is to try to save on the tensioner by installing an old or refurbished version. This is almost guaranteed to result in a chain being stretched again after a short time. Also, many masters forget to change the crankshaft oal, which leads to leakage of oil and contamination of the belt of the attachments.
Some owners try to replace only the chain, leaving old stars and shoes. This is not correct, as worn-out stars can quickly rub a new chain. A comprehensive replacement of the entire set is the only correct solution for ensuring reliability.
Can I change the chain by myself?
Technically possible, but without special tools and experience, there is a high risk of error, which will lead to major repairs of the engine.
Frequently asked questions (FAQ)
How often should you change the chain to 1.2 TSI?
The factory regulations state that the chain is βeternalβ, but real practice shows that the replacement should be carried out every 60,000-80,000 km of run, or when the first signs of knocking on the cold one appear.
Is it possible to drive with a stretched timing chain?
Short term yes, but with high risk. With severe stretching, the phases can βfloatβ, which leads to loss of power, increased fuel consumption and, in the worst case, to the meeting of the valves with the pistons.
Should I change the belt of the attachment when replacing the chain?
It is recommended to replace the belt, as when dismantling the pulley crankshaft, it is often damaged or loses tension. It is also worth checking the condition of the rollers and the generator.
Why does the hot engine stop knocking?
This has to do with the work of the hydrotensioner. Cold oil is thick and does not immediately enter the channels of the tensioner, so the chain sags. When the motor warms up, the pressure rises and the tensioner compensates for the gap.