Replacing the timing chain on a Škoda Felicia 1.3 (carburetor): a complete guide with photos and videos

Timing chain Škoda Felicia 1.3 with a carburetor engine - a critical element, the condition of which determines the performance of the entire power unit. Unlike belt drives, the chain is considered more reliable, but it also stretches over time, which leads to failure of the valve timing, increased wear of the sprockets, and even breakage. If you hear a metallic clanging sound from under the hood on a cold engine or notice unstable speed, these are sure signs that the circuit requires diagnostics.

In this article we will look in detail at how to replace the timing chain with Felicia 1.3 with your own hands, without resorting to the services of a service station. You will learn about the necessary tools, the intricacies of setting marks, the nuances of tension and typical mistakes that beginners make. Material added photo instructions, diagrams and video recommendations, and also contains current prices for spare parts and analogues. If you have never done this kind of work, don’t worry: with the right approach, replacing a chain on this engine takes 4-6 hours, even for beginners.

When to change the timing chain on a Škoda Felicia 1.3: signs and regulations

Manufacturer Škoda does not set strict timing chain replacement intervals for Felicia 1.3, but operating experience shows that critical changes begin after 150–200 thousand km. However, this indicator greatly depends on the conditions of use:

• 🔥 Aggressive riding with frequent re-gassing, it accelerates chain elongation by 30–40%.
• ❄️ Short trips in winter (the engine does not warm up to operating temperature) reduce the service life by 20–25%.
• 🛢️ Low quality oil or untimely replacement leads to accelerated wear of the sprockets and damper.
• 🔊 Extraneous noise (clanging, knocking) when starting from a cold state - a direct signal for diagnostics.

There are also indirect signs indicating problems with the chain:

• 📉 Floating speed at idle (especially after warming up).
• 🚗 Jerks during acceleration or power failures.
• 🔧 Lights up Check Engine (camshaft position sensor errors).
• 🛑 The engine stalls when the gas is released suddenly.

⚠️ Attention! If the chain has stretched so much that it has jumped 1-2 teeth, this will lead to collision of pistons with valves and engine overhaul. On Felicia 1.3 such a defect is less common than on 1.6-liter versions, but the risk remains.

For an accurate diagnosis, simply remove the valve covers and check the chain play manually. If it sags more than 10–15 mm when pressed with a finger, replacement cannot be postponed. Also pay attention to the condition sedative and tensioner: Their wear often accompanies chain problems.

What spare parts and tools will you need?

Before starting work, prepare everything you need. For Škoda Felicia 1.3 (carburetor) with engine 135/136 The following parts will be required:

Name	Article (original)	Analogs	Notes
Timing chain	021 109 101 C	Febi 10101, SWAG 10 92 1010	Length 114 links, pitch 9.525 mm
Crankshaft sprocket	021 109 221	SKF VKM 30101, INA 532 0331 10	It is recommended to change together with the chain
Camshaft sprocket	021 109 223	Febi 10123, Hepu P501	Often comes with a chain
Chain tensioner	021 109 463 B	SWAG 10 92 4630, Febi 10463	Definitely new!
Chain damper	021 109 467	Hepu P504, SKF VKM 30104	Plastic - check for cracks

Tools you will need:

• 🔧 A set of sockets and wrenches (especially 10 mm, 13 mm, 17 mm).
• 🔨 Impact screwdriver or air impact driver for the crankshaft pulley bolt.
• 📏 Vernier calipers for checking sprocket play.
• 🔗 A special puller for sprockets (can be made from an old chain).
• 🛠️ Sealant Loctite 574 or an equivalent for the cover gasket.

Preparation for replacement: draining the oil and removing the cover

Start working on cold engine - this way the oil will be less fluid, and the risk of getting burned will be minimized. First of all, drain the oil and antifreeze (if you plan to remove the pump).

Procedure:

1. Unscrew the drain plug on the pan (key 17 mm) and drain the oil into a container.
2. Remove the radiator hoses and drain the antifreeze (if required).
3. Disconnect the high-voltage wires by removing the distributor cover.
4. Dismantle the generator: disconnect the terminals, unscrew the fastenings (bolts 13 mm).
5. Remove the alternator belt and crankshaft pulley (you will need an impact screwdriver or a helper to secure the flywheel).

Now you can start removing the timing cover. It is attached to 10 bolts (key 10 mm). Be careful: under the cover there is a gasket, which is best replaced with a new one (part number 021 103 371). If the gasket is in good condition, it can be reused, but must be treated with a sealant.

Drain oil and antifreeze|Disconnect battery|Remove alternator and belt|Remove crankshaft pulley|Check timing cover gasket-->

⚠️ Attention! On Felicia 1.3 The crankshaft pulley bolt often gets stuck. To unscrew it, fix the flywheel through the starter inspection window (a mounting tool or a special clamp will help). Do not use excessive force - you risk breaking the thread!

Setting timing marks: step-by-step instructions with photos

This is the most critical stage. An error in setting labels will lead to engine malfunction or breakdown. On Felicia 1.3 marks are applied to:

• 🔄 Flywheel ring gear (visible through the inspection window on the gearbox).
• 🔗 Camshaft sprocket (must match the mark on the housing).
• 🔧 Crankshaft sprocket (mark on the pulley and cylinder block).

Setting algorithm:

1. Turn the crankshaft clockwise until the mark on the flywheel aligns with the triangular cutout on the gearbox.
2. Make sure the mark on the camshaft sprocket aligns with the protrusion on the bearing housing.
3. If the marks do not match, loosen the chain tensioner and manually adjust the camshaft position.

For a visual check, use a flashlight - the marks should be strictly opposite each other. If the chain is too stretched, you may need to turn the crankshaft 2 turns to ensure proper alignment.

What to do if the labels don't match?

If after several attempts the labels do not match, check:

1) Has the chain jumped on the sprockets (remove it and count the links between the marks - there should be exactly 42 links).

2) Are the sprockets worn out (replace them if the teeth are pointed).

3) Is the camshaft bent (occurs after impacts or overheating).

After aligning the marks, fix the position of the camshaft and crankshaft using special clamps or improvised means (for example, a screwdriver inserted into the sprocket teeth). This will prevent accidental movement when removing the chain.

Removing the old chain and installing a new one

When the marks are aligned, you can remove the old chain. To do this:

1. Loosen the camshaft sprocket bolt (wrench 17 mm) and remove it. Be careful - there is a key underneath that can be easily lost!
2. Remove the crankshaft sprocket in the same way.
3. Remove the chain guide (attached by 2 bolts 10 mm).
4. Remove the old chain and tensioner (it tends to stick - WD-40 may be needed).

Before installing a new chain, check the condition of the sprockets:

• 🔍 Inspect the teeth for chips or uneven wear.
• 📏 Measure the play of the sprockets on the shafts (the permissible value is no more than 0.1 mm).
• 🔧 If any defects are found, replace the sprockets with new ones.

Installing a new circuit is performed in the reverse order:

1. Place the chain on the crankshaft sprocket, then on the camshaft.
2. Make sure that the marks match (if not, scroll the chain by the required number of links).
3. Install the damper and tensioner (don't forget to remove the clamp from the tensioner plunger!).
4. Tighten the sprocket bolts to torque 50 Nm (for camshaft) and 80 Nm (for crankshaft).

Chain tensioning and engine assembly

Proper chain tension is the key to its long service life. On Felicia 1.3 used automatic tensioner, but its operation depends on oil pressure. Therefore:

1. After installing the chain, tighten the tensioner cap nut (torque 25 Nm).
2. Turn the crankshaft 2 turns clockwise.
3. Loosen the tensioner nut 1/2 turn, then tighten again.
4. Check the chain tension: it should bend no more than 5–7 mm when pressing with your finger in the middle between the stars.

If the chain is too tight or, conversely, sags, repeat the procedure. Excessive tension will accelerate the wear of the sprockets, and weak tension will lead to skipping.

After tensioning, reassemble the engine in reverse order:

• 🔧 Install the timing cover with a new gasket (the sealant is applied in a thin layer!).
• 🔄 Place the crankshaft pulley and tighten the bolt to torque. 100 Nm + additional rotation by 90°.
• 🔌 Connect the generator, high-voltage wires and pipes.
• 🛢️ Fill with new oil (recommended viscosity for Felicia 1.3 — 10W-40 or 15W-40).

⚠️ Attention! After assembly, start the engine and immediately check the oil pressure (lamp on the dashboard). If the light does not go out within 5 seconds, immediately turn off the engine and check the chain tensioner!

Common mistakes and how to avoid them

Even experienced craftsmen sometimes make mistakes when replacing a timing chain with Škoda Felicia. Here are the most common:

Error	Consequences	How to avoid
Label mismatch	The engine does not start or runs intermittently	Check the marks after each crankshaft rotation
Retightening the camshaft sprocket bolt	Shaft deformation or thread breakage	Use a torque wrench (50 Nm)
Using an old tensioner	The chain does not tension, jumps 1-2 teeth	Always install a new tensioner
Improper installation of damper	Increased noise, accelerated chain wear	Check the gaps between the damper and the chain

Another common problem is oil leak from under the timing cover. Reasons:

• 🔧 The gasket is installed incorrectly (skewed or damaged).
• 🛢️ Excessive amount of sealant (it is squeezed out into the engine).
• 🔨 Uneven tightening of the cover bolts (tighten crosswise!).

If the engine runs rough after replacing the chain, check:

• 🔧 Matching marks (again!).
• 🔌 Connecting high-voltage wires (a mixed order causes ignition failures).
• 🛑 Oil pressure (low pressure = tensioner not working).

FAQ: Frequently asked questions about replacing the timing chain on Felicia 1.3

Is it possible to replace the timing chain without removing the cover?

No, this is technically impossible. On Felicia 1.3 The timing cover blocks access to the sprockets and tensioner. Attempts to “cut” the chain and connect a new one without dismantling the cover will lead to incorrect installation and rapid breakage.

How often should the circuit condition be checked?

Recommended every 50–60 thousand km Visually inspect the chain through the removed valve cover. A complete diagnosis, including checking the play of the sprockets and tensioner, should be carried out every 100 thousand km.

What oil should I fill in after replacing the chain?

For Felicia 1.3 (carburetor) Suitable oils with viscosity 10W-40 or 15W-40 (semi-synthetic or mineral water). It is important that the oil meets specification API SG/CD or higher. After replacing the chain, it is recommended to add oil with wear protection additives (for example, Liqui Moly MoS2).

What happens if you don't replace a stretched chain?

The consequences depend on the degree of stretching:

• 🔧 Light stretch (up to 5 mm): increased noise, unstable idle.
• ⚠️ Medium stretch (5–10 mm): 1 tooth jump, camshaft sensor errors, loss of power.
• 💥 Strong stretch (more than 10 mm): jump of 2–3 teeth, collision of valves with pistons, valve bending and major repairs.

On Felicia 1.3 the risk of valves “meeting” the pistons is lower than on 16-valve engines, but it exists!

How much does it cost to replace a timing chain at a service center?

The cost of working in a car service varies from 8,000 to 15,000 rubles (for 2026). This amount usually includes:

• Replacement of chain, sprockets, tensioner and damper.
• Changing the oil and oil filter.
• Diagnostics of timing marks.

Replacing it yourself will cost 3,000–5,000 rubles (price of spare parts).