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12V Camshaft removal/replacement

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12V Camshaft removal/replacement

Postby Artiz1 » Fri May 26, 2017 6:58 am

Hi!

I need some advice how do you remove the camshafts on the 12V engine? Do I really need to lower the transmission into the subframe for more clearance? Or may it be done without?
All advice welcome! :)

Thanks!
'97 164 Super 2.5TD - donor car;
'97 164 Super 3.0L 12V Automatic - in assembly process;

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Re: 12V Camshaft removal/replacement

Postby riprex » Sun May 28, 2017 7:38 pm

Removing camshafts on 12V engine is pretty simple task. You dont even have to remove timing belt. But to do this on car you need to have special tool. Look at this page: http://www.alfabb.com/bb/forums/164-168-1991-1995/15049-changing-164-cam-pulley-oil-rings-oil-seals.html That guy uses special puller to pull down camshaft pulley, but to pull down rear camshaft he removes gearbox support and drops it lower to make some space. If you make yourself clever little puller, you don´t have to do this. I will post picture of our custom puller.
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Re: 12V Camshaft removal/replacement

Postby Artiz1 » Mon May 29, 2017 7:20 am

Thanks!

I've seen that post, but I think I may have missed the fact that once you remove the cam hub, there seems to be just enough space to lean the camshaft upwards to get it out.
I got confused, because I read another one of Alfisto Steve's posts where he replaced the front camshaft using the same method, BUT since he has a distributor, he could remove the camshaft via that hole. I don't have a distributor and that hole is plugged with a plug. So I have to remove the hub anyway. Also I'm replacing the timing belt, so it's not a big deal if it has to be removed, as it's already in the bin :)
'97 164 Super 2.5TD - donor car;
'97 164 Super 3.0L 12V Automatic - in assembly process;

('16 Skoda Octavia - daily driver)
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Re: 12V Camshaft removal/replacement

Postby riprex » Mon May 29, 2017 9:50 pm

No, you dont have to remove cam hub. It is all just about pull it down a bit, because there is a conical surface and its often stuck together. That is what that puller is for :wink: I recommend you to remove all three exhaust tappets and pushrods, then rotate engine clockwise until all three inlet valves will be closed. Remove all cam caps and there you go. You can move freely the camshaft pulley hub, but be careful, you don't want to pull it too much from cylinder head because that is the only thing that holds pulley and therefore timing belt in position.
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Alfa Romeo 164 3.0 V6 QV 1990 - Silver Shadow...
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Re: 12V Camshaft removal/replacement

Postby Artiz1 » Tue May 30, 2017 7:30 am

Thanks for the tips!
My timing belt is already removed, I also removed all the cam bearing caps but it just didn't seem to me, that the camshaft will have enough free play to be lifted out.
I won't be able to remove my exhaust tappets without removing the camshaft first (this is one of it's removal reasons) - number 6 exhaust tappet (and maybe even others, I didn't bother looking at others) is so squashed, that it can not be removed through the pushrod side, it's head is now thicker than the rest of it...
Well, I guess it's a "try it and believe it" thing then :) I'll go and buy a puller then later today.
'97 164 Super 2.5TD - donor car;
'97 164 Super 3.0L 12V Automatic - in assembly process;

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Re: 12V Camshaft removal/replacement

Postby riprex » Tue May 30, 2017 6:13 pm

To remove exhaust tappets you dont have to do anything with camshaft. Just turn engine clockwise till camshaft is not pushing at tappet you want to remove. Then take exhaust valve rocker with some suitable pliers you have and move it to open the valve. Than you can remove pushrod and tappet. It is as simple as that.
Alfa Romeo 159 2.4JTDm 2007 - immortal...
Alfa Romeo 164 3.0 V6 QV 1990 - Silver Shadow...
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Re: 12V Camshaft removal/replacement

Postby Artiz1 » Tue May 30, 2017 8:51 pm

riprex wrote:To remove exhaust tappets you dont have to do anything with camshaft. Just turn engine clockwise till camshaft is not pushing at tappet you want to remove. Then take exhaust valve rocker with some suitable pliers you have and move it to open the valve. Than you can remove pushrod and tappet. It is as simple as that.

You didn't read what I posted :)
"I won't be able to remove my exhaust tappets without removing the camshaft first (this is one of it's removal reasons) - number 6 exhaust tappet (and maybe even others, I didn't bother looking at others) is so squashed, that it can not be removed through the pushrod side, it's head is now thicker than the rest of it..."

Anyway, bought the puller and removed the front camshaft. Now to repeat the process and to remove the rear one. So far it seems that it is not necessary to move the engine for it - there is just enough space for the hub to move enough to free the camshaft.
'97 164 Super 2.5TD - donor car;
'97 164 Super 3.0L 12V Automatic - in assembly process;

('16 Skoda Octavia - daily driver)
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Re: 12V Camshaft removal/replacement

Postby riprex » Wed May 31, 2017 5:44 am

I did, but missed that, sorry :) I have never seen tappet so much destroyed. Camshaft is probably also gone. Double check that the tappet seat is without any damage.
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Alfa Romeo 164 3.0 V6 QV 1990 - Silver Shadow...
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Re: 12V Camshaft removal/replacement

Postby Artiz1 » Wed May 31, 2017 7:01 am

Yes, you are right about the camshaft - again, another reason why I removed it - that particular lobe is 5.4mm, which is a lot less that the minimum... That's why I got a terrible knocking sound from the engine.
To top everything up, somebody had adjusted the intake valves on that head to 0.2mm! Instead of 0.475mm...
But the best was yet to come - the rear head's cyl number 3 intake valve gap was about 0.05mm....

And I was wondering why my idle was rough :D
'97 164 Super 2.5TD - donor car;
'97 164 Super 3.0L 12V Automatic - in assembly process;

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