Dumbass mistake

[alexb6t]

So here's the thing,
my friend remplaced is cam chain tensioner on his 1.8t but now the car is running slighty bad(but it doesnt knock or anything it just not run well) Is there a way to check if he missed a theeth or something,where should we start ?

[jesse500]

grammar and punctuation go a long way.

[alexb6t]

Sorry stupid autocorrect + my english is not the greatest

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[jesse500]

So he replaced the timing chain upper guide? How many links between the gears?

[alexb6t]

No he replaced the binder,the guides and the chain but like the genius he is,he havent mark the gears

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[jesse500]

What is the binder? Tensioner?

[alexb6t]

Yeah sorry

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[customa4]

There should be 16 links between.

Yes sir. Crank mark at TDC and Cam mark at 12 o'clock (you have the valve cover off, so just make sure it is straight up and not down toward the ground (that would be "180 out"). Then look at the marks at the rear of the cams. This will confirm if your cam gear keyway is damaged or not. We are mainly interested in the exhaust cam mark, but the intake mark should be reasonably close to it's "arrow" as well.

[alexb6t]

I know but i think he turned the intake cam is there a way to check if it is in the right position

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[diagnosticator]

I know but i think he turned the intake cam is there a way to check if it is in the right position

With the timing belt alignment marks aligned at top dead center #1 piston, the exhaust cam 1st chain roller is offset 1/2 sprocket tooth toward the exhaust manifold from the vertical alignment of the cam bearing cap arrow, and the notch on the exhaust cam, and the 16th chain roller is vertically aligned with the intake cam bearing cap arrow and the notch on the intake cam.

[alexb6t]

Problem solved those bolts where not torqued right ! thanks everyone

[alexb6t]

Can't see,maybe its because im on my phone ?

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[diagnosticator]

Yeah maybe. PM sent.

[Captain_Panic]

Can't see,maybe its because im on my phone ?

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No, the links don't work. At least the problem was solved! Congrats OP!

[diagnosticator]

No, the links don't work. At least the problem was solved! Congrats OP!

Image replaced.

[diagnosticator]

I am skeptical that the rough(?) running symptom could be caused by a loose cam bearing cap. That is inconsistent with the typical case.

[alexb6t]

They was not loose they was wayyy too tight

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[diagnosticator]

They was not loose they was wayyy too tight

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OK, an over-tightened cam bearing cap would not cause the engine to run roughly or poorly. There must be something else involved.

[alexb6t]

It was only rough on idle... and that's the only thing i did.

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[diagnosticator]

It was only rough on idle... and that's the only thing i did.

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Alright. Regardless, there must have been something else causing the rough idle, that is now resolved somehow. No point in speculating for the actual cause further since it is only an academic matter now.

[alexb6t]

Yeah, thanks anyway !

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[Seerlah]

They are to be torqued to only 7 ft/lbs. It isn't much tq at all. I use the feeler method on this, because it is basically snug. But I have a fairly decent feeler.

Going on assumption. If the caps were too too tight, then that also put extra strain on other parts such as your timing belt. You have a certain combustion at idle that isn't much. Basically just enough to drive the pistons and keep the engine running with no drivetrain load. Your belt had to work extra hard to move your cam. And to top that, you possibly could have (most likely did) scored your cam journals. Not saying that is what happened. All assumption.

[uzone02]

any engine noise ?