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Resetting the Cams

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
2003 - 2007 S60 R

Mountainman45
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Resetting the Cams

Post by Mountainman45 » Thu Jun 04, 2020 6:18 pm

I'm currently rebuilding a 2003 V70 T5 head (B5234T3) and, foolishly, I removed both sprockets from each cam when I was uninstalling the cams and cam cover, rather than just lift up the cams and sprockets as one piece. I only have exhaust VVT so I can clearly differentiate between those Intake and Exhaust. My confusion comes in when I have to reinstall the cams and sprockets. I no longer know which way to rotate and bolt up the cams to match up the cams and crank to find TDC. I'm happy to answer any questions i just really need advice!

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abscate
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Re: Resetting the Cams

Post by abscate » Thu Jun 04, 2020 7:30 pm

There are no TDC marks, just clearance marks , on either cams or crank

On a VVT CAR, the cams and sprockets have to be set by indexing the rear of the cams with a cam tool.

It needs to be correct to within 4 degrees of rotation of the cam, so eyeballing it probably won’t work
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Mountainman45
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Re: Resetting the Cams

Post by Mountainman45 » Thu Jun 04, 2020 7:47 pm

Where do I find clearance marks?

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SuperHerman
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Re: Resetting the Cams

Post by SuperHerman » Thu Jun 04, 2020 7:51 pm

Front of the cam has the VVT and/or gear - rear of cams have slots. The slots are aligned with the head seam as I recall. One of the cams is above and one is below - the alignment is horizontal or parallel - not verticle or 90 degrees.

If you have cam tools your task will be easy as the tools will only slide in if the slot is orientated correctly. If you don't have tools it can be done, but not so easy. Some people make a holding tool out of angle iron.

I suggest you do some searching on the forum as there are plenty of right ups with pictures of how the slots on the rear have to be aligned. Once you figure this out just lay the cam as close to this position as possible for each side and install the cam cover. Once this is done you can find tune the slots so they are dead on. The few degrees of movement will not be an issue.

Before doing this make sure the crank is at the correct timing mark - it can only be correct in one place. Same for the cams - if all three are at their marks you are good. You can fine tune the cams the few needed degrees in either direction. Everything changes once the timing belt is installed as the system is tied together.

So - research which side of the seam your cam slot needs to sit at and put it as close to that point for each side - again the intake and exhaust cam, as I recall are different with respect to which side of the seam you want. It will make sense once you see the pictures people have posted.

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Re: Resetting the Cams

Post by SuperHerman » Thu Jun 04, 2020 8:00 pm

viewtopic.php?f=1&t=26864

See here - it shows much of what you ask.

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abscate
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Re: Resetting the Cams

Post by abscate » Fri Jun 05, 2020 4:55 am

Since the engine is angled the cam slots will not be parallel to ground , but parallel to the seam on the cylinder head.
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