VVT hubs install / adjust

MarcM · Post by **MarcM** » 02 Mar 2018, 20:35

It's been a process of several months (comedy of errors on my end), but I'm getting around to installing my rebuilt cylinder head. I got the head back today and discovered the rebuilder pulled the VVT hubs off the camshafts to check valve adjustments. I sent the camshafts down with the head for the valve adjustment portion and figured I'd simply put the camshafts back in with the VVT hubs attached and align the timing belt. I marked the camshaft gears with yellow pen paint around the bolts so it would have been easy. Get the camshafts to near perfect timing with a hairy eyeball on the sensor end, install the cam gears using paint marks and install timing belt. That plan went south quick. My gut is still churning several hours after the discovery.
I tried searching, but failed to find the process to install & adjust them. Looks like I'm purchasing a cam shaft locking tool at the very basic to start. Anyone know of a step-by-step?
On the brighter side, head looks like new!

Post by **abscate** » 02 Mar 2018, 21:46

You will find lots of threads on overtightening the cam lock tool bolts and really creating a Charlie foxtrot

MarcM · Post by **MarcM** » 02 Mar 2018, 22:46

Know of a good video or step-by-step guide to re-installing the VVT hubs onto the camshafts? Mine has two of course (you know, just to make it more difficult). The comedy of errors continues... enough where about about ready to scrap the car... after a $500 head rebuild job.

Post by **chrism** » 03 Mar 2018, 00:31

Try this, written by user F250.

download/file.php?id=32533

MarcM · Post by **MarcM** » 03 Mar 2018, 06:13

EXCELLENT Smithers! Thank you, a million times over.

Post by **vtl** » 03 Mar 2018, 08:02

After the hubs are on, check the VVT angles discrepancy in VIDA, it should be less than 4 degrees. I managed to install one with 1 degree error and the other one just perfectly, fraction of a degree.

Post by **Rattnalle** » 03 Mar 2018, 08:05

vtl wrote: ↑03 Mar 2018, 08:02 After the hubs are on, check the VVT angles discrepancy in VIDA, it should be less than 4 degrees. I managed to install one with 1 degree error and the other one just perfectly, fraction of a degree.

The instructions in VIDA say <10 degree cam angle calibration is acceptable. At least it did two days ago when I did the very same check on my car.

Post by **vtl** » 03 Mar 2018, 08:10

Rattnalle wrote: ↑03 Mar 2018, 08:05 The instructions in VIDA say <10 degree cam angle calibration is acceptable. At least it did two days ago when I did the very same check on my car.

I read in VIDA 2011C for MY05 anything above 8 degrees VVT would not be able to compensate (bent valves). Full engine power is achievable with less than 4 degrees. Unless memory is lying...

Under 4 degrees is very easy to do.

Post by **abscate** » 04 Mar 2018, 10:21

Just resist the temptation to line up all the timing marks, and follow the Volvo instructions about leaving it one tooth short on alignment, and you won't have to take it off and put it on twice.

the non CVVT cars are simpler, but once you understand how the VVT works, it isn't rocket surgery to get it right.

Post by **Rattnalle** » 04 Mar 2018, 10:56

Vida says to line the marks up for vvt engines just like ordinary engines. Thats the whole point of the marks to begin with..