Hello, unfortunately the head gasket broke down, or the head itself is damaged, so I will have to unfold it and check. By the way, I wanted to clean the pistons from carbon deposits, so when I pull the heads I will have to turn the shaft to have individual pistons at the top. How to determine...

Hello. This model has a belt and the marks are on the camshaft gear and the shaft gear.

Thanks for the help. this engine has a double timing, if you can call it that.

This is exactly how the chain on the camshafts at the back.

Does the position of the gear marked on the photo matter? Because when washing the engine, I washed away the dots previously made with the marker. What role does this wheel play? Oh, this photo is an illustrative photo, it's not mine, but it's the same engine

It doesn't matter how the wheel will be positioned.

And then more questions arose After setting the rollers and screwing the head, I was about to put on a belt and something breathed me to check if the mark on the flywheel also covers. As it turned out, there is no sign there. Which window do you need to look at? because I see three Is setting the crankshaft for marks from a plastic housing and a pulley a good idea? What does the sign on the flywheel look like in this engine, because in the audi 80, the polonaise was zero, or dash and nothing here? Below are illustrative photos And this is how it looks at the back, after setting the shaft in front of the characters (this white line on the tooth is mine) By the way, take a look at the rollers, are they well positioned,

On the gear and on the casing there is a notch in hole No. 2 only then it is visible as is the shaft in position that 1 and 4 piston at the top.

as I was assembling, pistons 1 and 4 were at the highest point, and the signs matched the front, but probably this stroke was not and that is why it came out like that. (okay i think?) So what do I need to dismantle the shafts to close the valves and turn the shaft once more by 360 and again as a sign?

This is exactly how it should be as they write in the book so that then someone in the future would not wonder if it has a well-timed valve or not. Added after 38 [minutes]: As for the photos with rollers, it is on the fourth cylinder where the chain is to be on the side and this is how it should look. This means that the valves are starting to open.

At the same time, pay attention to the correct positioning of the rollers towards each other - minimal misalignment of characters, caused by whether the wrong setting, or wear of the slides and the chain causes throwing errors of the adjuster system (lack of proper correlation of CKP-CMP sensors) - a annoying defect.

VW Passat B5 1.8T 1997 AEB: Head Gasket Repair, Timing Setting, & Carbon Cleaning Guide

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#1 17193042 28 Apr 2018 17:52

*michal* *michal*

Level 10

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Post #1
17193042 28 Apr 2018 17:52

Hello, unfortunately the head gasket broke down, or the head itself is damaged, so I will have to unfold it and check. By the way, I wanted to clean the pistons from carbon deposits, so when I pull the heads I will have to turn the shaft to have individual pistons at the top. How to determine later GMP (compression stroke on the first piston) to assemble the timing? Is it enough that later set up the shaft with the mark on the flywheel. I used to replace the head gasket, only that in another car a colleague mechanic helped me then, it was a few years ago and I don't remember that anymore. When it comes to camshafts, I know that the signs should match and they should be connected with 16 chain links.
Thanks greetings
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#2 17193077 28 Apr 2018 18:12

szymitsu21 szymitsu21

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Post #2
17193077 28 Apr 2018 18:12

Mark on the shaft and roller. That's all.
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#3 17193086 28 Apr 2018 18:16

Pedros050 Pedros050

Level 43

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Post #3
17193086 28 Apr 2018 18:16

Hello. This model has a belt and the marks are on the camshaft gear and the shaft gear.
#4 17193230 28 Apr 2018 19:35

*michal* *michal*

Level 10

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Post #4
17193230 28 Apr 2018 19:35

Thanks for the help.
this engine has a double timing, if you can call it that.
#5 17193244 28 Apr 2018 19:41

Pedros050 Pedros050

Level 43

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Post #5
17193244 28 Apr 2018 19:41

This is exactly how the chain on the camshafts at the back.
#6 17217140 12 May 2018 17:47

*michal* *michal*

Level 10

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Post #6
17217140 12 May 2018 17:47

Does the position of the gear marked on the photo matter? Because when washing the engine, I washed away the dots previously made with the marker. What role does this wheel play?

Oh, this photo is an illustrative photo, it's not mine, but it's the same engine
#7 17217168 12 May 2018 18:12

Pedros050 Pedros050

Level 43

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Post #7
17217168 12 May 2018 18:12

It doesn't matter how the wheel will be positioned.
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#8 17256708 03 Jun 2018 21:33

*michal* *michal*

Level 10

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Post #8
17256708 03 Jun 2018 21:33

And then more questions arose
After setting the rollers and screwing the head, I was about to put on a belt and something breathed me to check if the mark on the flywheel also covers. As it turned out, there is no sign there.
Which window do you need to look at? because I see three
Is setting the crankshaft for marks from a plastic housing and a pulley a good idea?
What does the sign on the flywheel look like in this engine, because in the audi 80, the polonaise was zero, or dash and nothing here?
Below are illustrative photos

And this is how it looks at the back, after setting the shaft in front of the characters (this white line on the tooth is mine)

By the way, take a look at the rollers, are they well positioned,
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#9 17256720 03 Jun 2018 21:37

Pedros050 Pedros050

Level 43

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Post #9
17256720 03 Jun 2018 21:37

On the gear and on the casing there is a notch in hole No. 2 only then it is visible as is the shaft in position that 1 and 4 piston at the top.
#10 17256762 03 Jun 2018 21:49

*michal* *michal*

Level 10

» | Topic author Helpful post? (+1)

Post #10
17256762 03 Jun 2018 21:49

as I was assembling, pistons 1 and 4 were at the highest point, and the signs matched the front, but probably this stroke was not and that is why it came out like that. (okay i think?)
So what do I need to dismantle the shafts to close the valves and turn the shaft once more by 360 "and again as a sign?
#11 17256783 03 Jun 2018 22:33

Pedros050 Pedros050

Level 43

» | Helpful post? (+1)

Post #11
17256783 03 Jun 2018 22:33

This is exactly how it should be as they write in the book so that then someone in the future would not wonder if it has a well-timed valve or not.

Added after 38 [minutes]:

As for the photos with rollers, it is on the fourth cylinder where the chain is to be on the side and this is how it should look. This means that the valves are starting to open.
#12 17256955 03 Jun 2018 22:51

robokop robokop

VIP Meritorious for electroda.pl

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Post #12
17256955 03 Jun 2018 22:51

At the same time, pay attention to the correct positioning of the rollers towards each other - minimal misalignment of characters, caused by whether the wrong setting, or wear of the slides and the chain causes throwing errors of the adjuster system (lack of proper correlation of CKP-CMP sensors) - a annoying defect.
#13 17257076 04 Jun 2018 00:25

*michal* *michal*

Level 10

» | Topic author Helpful post? (0)

Post #13
17257076 04 Jun 2018 00:25

The tensioner is new. I can't check the rollers now, because the car is at my friend's garage, but are you suggesting that they are badly folded? In the book, I fix myself, it was written only that the marks on the rollers and bearing housings were to be covered, and between them were to be 16 links. For me, this square on the suction shaft gently escapes outside (towards the suction manifold) relative to this arrow on the bearing housing, but it seemed to me that there are 16 links.
and returning to the flywheel should this sign look like?

Photo borrowed from the internet "forums.kilometermagazine"

If I don't see any sign in this window No. 2, does it mean that I need to set the crankshaft over again?
#14 17257266 04 Jun 2018 08:27

lukashb lukashb

Level 39

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Post #14
17257266 04 Jun 2018 08:27

Yes exactly.
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Topic summary

✨ The discussion revolves around the head gasket repair and timing setting for a 1997 VW Passat B5 1.8T with an AEB engine. The user seeks guidance on determining the correct position for the crankshaft and camshaft during reassembly after cleaning carbon deposits from the pistons. Key points include the importance of aligning timing marks on the camshaft and crankshaft, ensuring that the first piston is at the top dead center (TDC) during the compression stroke, and verifying the alignment of the timing belt or chain. Participants emphasize the need to check the flywheel marks and the correct positioning of rollers to avoid misalignment issues that could affect engine performance. The discussion also touches on the significance of maintaining the correct number of links between timing components.
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FAQ

TL;DR: For VW Passat B5 1.8T AEB timing, set pistons 1 and 4 at TDC and align the crank’s "a notch in hole No. 2" with the casing; then align cam/chain marks. [Elektroda, Pedros050, post #17256720]

Why it matters: This helps DIY AEB owners correctly re-time after head work or carbon cleaning, avoiding sensor faults and poor running.

Quick Facts

The AEB uses a timing belt; marks are on the camshaft gear and the crankshaft gear. [Elektroda, Pedros050, post #17193086]
A short chain links the two camshafts at the back of the cylinder head. [Elektroda, Pedros050, post #17193244]
Cam-to-cam setup expects 16 chain links between timing marks. [Elektroda, michal, post #17257076]
Use inspection window No. 2; the notch aligns when pistons 1 and 4 are at TDC. [Elektroda, Pedros050, post #17256720]
Even small cam misalignment or worn guides/chain can trigger CKP–CMP correlation errors. [Elektroda, robokop, post #17256955]

How do I set TDC on the AEB 1.8T after head work?

Rotate the crank until the gear’s notch lines up with the casing notch visible in inspection window No. 2. In that position, pistons 1 and 4 sit at top dead center. This is your reference for installing the timing belt and checking cam positions. [Elektroda, Pedros050, post #17256720]

Which inspection window shows the crank timing mark?

Use window No. 2. The crank gear’s notch becomes visible there when the crank is positioned so that pistons 1 and 4 are at TDC. Align that notch with the casing’s index to set the base timing position. [Elektroda, Pedros050, post #17256720]

I can’t see any mark in window No. 2—what should I do?

Rotate the crankshaft one full turn (360°) and check the window again. If the notch still isn’t visible, reset your setup and re-align using the correct reference window. "Yes exactly." [Elektroda, lukashb, post #17257266]

Is the AEB engine timed by belt or chain?

It uses a timing belt for the crank-to-cam drive. The factory marks are on the camshaft gear and the crankshaft gear, which you align during belt installation. [Elektroda, Pedros050, post #17193086]

What does the rear cam chain do on this engine?

A short chain connects the intake and exhaust camshafts at the back of the head. This cam-to-cam link must be set correctly to maintain proper valve phasing across both cams. [Elektroda, Pedros050, post #17193244]

How many links between cam marks, and how do I count them?

Set 16 links between the cam timing marks. How-To: 1) Align each cam’s mark to its bearing cap mark. 2) Fit the chain so the marked links straddle the two cam marks. 3) Count the links between marks; you need exactly sixteen. Recheck after tensioning. [Elektroda, michal, post #17257076]

Do tiny misalignments between cam marks matter?

Yes. Even minimal cam misalignment, or wear of the chain and guides, can cause the ECU to throw CKP–CMP correlation faults. Correct the marks and inspect the chain system if you see such errors. [Elektroda, robokop, post #17256955]

Where should the cam chain sit near cylinder 4 when timed?

Viewed from the rear, the chain sits to the side at cylinder 4 in the correct staged position. In that orientation, "the valves are starting to open," indicating proper phasing near overlap. [Elektroda, Pedros050, post #17256783]

Does the orientation of that small auxiliary gear in the photo matter?

No. Its position does not affect the core timing procedure described here. Focus on the official alignment marks rather than any wiped-off paint dots or that gear’s orientation. [Elektroda, Pedros050, post #17217168]

Is “mark on the shaft and roller” really all I need to set timing?

Yes. Align the mark on the crankshaft gear with the casing mark, and the cam gear mark with its reference. “Mark on the shaft and roller. That’s all.” [Elektroda, szymitsu21, post #17193077]

Can I use the plastic timing cover and pulley marks to set the crank?

Use the crank gear-to-casing notch alignment visible in inspection window No. 2. That is the clear reference for setting TDC on this engine, not ambiguous cover markings. [Elektroda, Pedros050, post #17256720]

What if pistons 1 and 4 were at the top but not on compression?

Rotate the crankshaft 360° and re-align the marks. Then reinstall or re-tension the belt with the marks matching precisely. This ensures the compression stroke reference is correct. [Elektroda, lukashb, post #17257266]

After reassembly, how can I confirm cam timing on this AEB?

Check that each cam gear mark aligns with its bearing housing mark, and verify 16 chain links bridge those cam marks. This double-check confirms cam-to-cam and cam-to-crank phasing before first start. [Elektroda, michal, post #17257076]

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