Problems with crankshaft pulley after cambelt change.

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480_owner
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Problems with crankshaft pulley after cambelt change.

Post by 480_owner » Sun Jun 24, 2007 7:08 pm

So I just spendt most of my sunday changing my cambelt and pulleys, following the excellent instructions from the how-to section. Alas now I am having problems with the crankshaft pulley. I should mention I have '95 480 ES 2.0 with airconditioning.
When i was changing the cambelt i needed to unmount the crankshaft pulley so I could mount the new cambelt. Once it was time to mount the crankshaft pulley back on I did it as strong as possible since the Haynes manual mentions 90 NM as the torque and I didn't have a instrument to measure it. I finished up by mounting the aux belt and closing up.
Once i started the engine it sounded fine for a moment and then a loud screeching sound came from the front. :angry: I stopped the engine and lifted the car up again to check for damage. I noticed the the crankshaft pulley had loosened and unmounted it to check it out. i noticed that the hole where the screw goes through the pulley was not round but more oval, is that normal (I dont imagine but i might be wrong)?
Any ideas to what might have happened and what remedies could help? Do i need a new pulley? What did I do wrong? How can I avoid it in future?

Thanks for your help and sorry for all the questions.

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martinholmesuk
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Post by martinholmesuk » Sun Jun 24, 2007 7:48 pm

Hi,

Why have you removed crankshaft pulley?

Your only meant to remove the aux belts then losen the cam belt tension pully so it slides across and slackens the belt enough for the new belt to slip on.

You sure your talking about the crankshaft pulley? It's the one right at bottom of engine!

+ you should replace any nuts/bolts if you have done this.

got pictures?

It sounds like the belt is slapping which means it's loose however the cam belt (goes around the crank and up to cam) has teeth so i'm not sure how it would slap but the alternator/power streering belt would cause a slapping sound if loose.

If the cam belt came lose then your head would be scrap.

Cheers

Martin
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480_owner
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Post by 480_owner » Sun Jun 24, 2007 8:04 pm

Hi Martin,

Thanks for your speedy reply.

I would like to clarify, that I removed the aux belts and the crankshaft pulley on which the aux belt was mounted. Not the pulley on which the cam belt is fitted. The crankshaft pulley for the aux belt is mounted directly on the crankshaft pulley for the cambelt. (The cam belt and cam pulleys are fitted perfectly and it pose no problems.) I needed to remove the pulley otherwise i wasn't able to slide of the cam belt.

The Engine still runs perfectly, so luckily no damage. It is only the aux belt that pose a problem.

I will try to get some pictures tomorrow, if they are of any help.

I am a bit annoyed that I spent most of my sunday on this and now I am not able to drive my beloved 480 to work tomorrow. :cry:

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pol
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Post by pol » Sun Jun 24, 2007 8:04 pm

You do need to remove the crankshaft pulley, i think you're thinking of the crankshaft sprocket, behind the pulley mart? I always remove the pulley anyway...

I'm not sure what you mean by an oval hole... Maybe... But it is certainly meant to only fit in one position. I believe there is a little stud on the crankshaft sprocket which will locate in a small hole in the pulley. Perhaps you missed this and tightened it up which would have instantly slipped and loosened.

pol

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Post by 480_owner » Sun Jun 24, 2007 8:51 pm

farm2.static(dot)flickr(dot)com/1161/614950946_97afcdb1c6(dot)jpg?v=0

(Sorry for the above but I am not yet allowed to post links)

The red arrow points to two pulleys connected to the crankshaft. The one in front is for the aux belt and the second is for the cam belt. I removed the bolt in the middle, which allowed me to remove the front pulley. It could be that it is called a sprocket.

I checked and I can't see any sprocket or small hole.

Anyway I hope this image might help. Thanks again for your help.

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martinholmesuk
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Post by martinholmesuk » Sun Jun 24, 2007 9:07 pm

Image

Not enough sleep lol
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aibast
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Post by aibast » Mon Jun 25, 2007 7:15 am

I hope my how-to isn't hard to understand :S Cos as I said. Only remove 2 pulleys the tensioner and the alighment pulley. You don't need to touch the crank or cam pulley or any other ones. The belt can be removed without removing the cranc pulley. The space is very limited, but it can be done.

"Remove the cam belt. Then the pulleys that don't have teeth (there are 2, the tentsioner and an alighment wheel ) and replace with the new."
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pol
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Post by pol » Mon Jun 25, 2007 7:47 am

It's really no big deal removing the crank pulley though!

pol

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Post by 480_owner » Mon Jun 25, 2007 8:25 am

Aibast - Your 'How to' is excellent, better than Haynes' description. Unfortunately I thought the crank pullley needed to be removed as I wasn't able to get the cambelt off. Also my new cambelt had two white lines that needed to be aligned with the markings on the tooth sprockets, which I couldn't see unless I took the pulley off.

Pol - When you have removed your pulley, did you notice any stud on it? Also what did you do when you put the pulley back. It seems i need to get a new pulley unfortunately. :( The hole for the bolt has been worn, so that the hole has become oval. I guess that could also explain why the pulley gets stuck and the bolt came loose. Does anyone know where I could get one, I tried partsonline, but they don't have it. I usually try to avoid volvo as they are usually quite expensive.

Thanks for all the help. I hope I will be able to solve my problem soon, as I am alredy having retrieval symptoms. :badmood:

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JohnTurbo
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Post by JohnTurbo » Mon Jun 25, 2007 9:33 am

I'm not sure what i did with the pulley from my engine. (I stripped one down)

It might be around. I'll try and remember to have a look.

- YOu don't need those white lines. You just lock the crank through the hole at the gearbox side of the block, and line the camshaft up so the notch in the pulley is central to the cambelt cover clip - or place the cover on and use the mark.
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Post by DaKyy » Sat Jun 30, 2007 12:44 pm

I had to remove the pulley. Absolutely no way I could see when the timing mark was on correct place. Seemed like it was hard enought with the pulley out. Couldn't imagine how hard it is with the pulley on place :shock:

Although I have to change the waterpump also, so it had to come off nevertheless.
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Post by 480_owner » Mon Jul 02, 2007 2:35 pm

Hi everyone,

Sorry for my absence. I have still not been able to find the pulley at the breakers and Volvo is quoting me around 100 pounds for it. :shock:

Anyway I would like to ask if anyone who has removed the pulley has seen any tabs on the back.

I have posted a few pics of my pulley here:

farm2(dot)static(dot)flickr(dot)com/1367/695054293_ff6814a066.jpg?v=0

farm2(dot)static(dot)flickr(dot)com/1193/695054207_c51efe2622.jpg?v=0

farm2(dot)static(dot)flickr(dot)com/1367/695054293_ff6814a066.jpg?v=0

It seems the bolt has shaved the pulley around the center hole on both sides.

DaKyy - How did you put the pulley back in place? I mean how hard did you tighten it, did you use a new bolt and did you use any lock-tite?

Thanks again to all for your help.
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Post by DaKyy » Mon Jul 02, 2007 7:32 pm

Haven't gotten into fitting it back yet :)

But if I remember correctly, the right torgue for the bolt was 95nm

I'll take some pics of it as I'll probably fit it tomorrow or day after that :)
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Post by DaKyy » Wed Jul 04, 2007 2:55 pm

I fitted it back today, couple of pics:
Image
Image
Click pictures for bigger images.

I put it to 95nm as Haynes said it was and used the old bolt. Seemed to go in quite nicely. Haven't tried running it though, snapped the alternator tension bolt so the aux belt is now loose.
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Post by Milosz_480 » Wed Jul 04, 2007 7:25 pm

Off:
I like this pic from your album:

Image

Very artistic :)
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Post by DaKyy » Thu Jul 05, 2007 4:45 am

Milosz_480 wrote:Off:
I like this pic from your album:

Image

Very artistic :)
Artistic?
I'd say more like: Rusty, or sad :)
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aibast
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Post by aibast » Thu Jul 05, 2007 6:01 am

some one call in the exterminators or crittercontroll - rustworm is on the loose :)

PS. cool pic :)
1996 850R 2.0 T5 - "Beebi R"
1994 480 Turbo - RichMod - sold to get the R
1992 850 2,5 20V - sold to get the R
1987 744 TIC - Haas Tuning - totaled by BMW
1973 142 GL B20E - sold

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Melvin480
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Post by Melvin480 » Sun Aug 16, 2009 7:02 pm

A short question that fits more in this topic than in a new one:

To loosen (or tighten) the pulley bolt, you have to make sure the crankshaft doesn't rotate. Is it possible to use the inserted drillbit to lock the crankshaft for this purpose? Or is the drillbit part only for holding the crankshaft at a certain position and not for applying force to it?

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Post by DaKyy » Sun Aug 16, 2009 7:37 pm

I loosed and tightened the bolt against it, so I guess it doesn't brake anything :)
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