1999 S80-T6 Cam locking tools

SimLyons · Post by **SimLyons** » 23 Oct 2013, 16:34

Getting ready to change the timing belt (and associated parts) on my T-6. The only worry I have from reading here is locking the cams and crank in alignment.

I don't like the price of the IPD unit ($105.00) or the same tool at other sites for $10 less.

I think the idea is the same as the 850s; to lock everything in ONE position for the removal and replacement. Timing marks are irrelevant IF every is locked and don't move during the procedure. I know the VVT makes this a different animal, but the same should hold true: I'll get everything close to where it should be, lock it (clamp the cam sprockets together, pull the plugs so crank won't move (and mark it anyway just in case) and then lay in the belts, water pump, pulley, tensioner, etc) and go from there. OR, lay out the bucks even if I will only use it one time?

Advice?

Post by **jimmy57** » 23 Oct 2013, 17:37

Find the timing marks.
Turn crank 90 degrees CW and then the 90 degrees CCW to get marks aligned once more. This unwinds the spring in the cvvt hub on 99-2001 exhaust cams on turbo so you do not have to fight with it when placing belt.
Paint mark the crank and both cam gears in places readily visible to you then remove old belt.
Fit new belt and assure your marks are aligned and then you need no special tools. The movement of cams is not due to cylinder pressure, it is due to valve tappets apply force to cam lobes. The NOT TDC point where these engine time is partly done to get a place where the forces on cam lobes is balanced and it will stay put.

SimLyons · Post by **SimLyons** » 23 Oct 2013, 18:34

Yes, thanks Jimmy!

My one worry is that when I release the tensioner against the new belt there will be a tightening and the pull will move things.

Post by **jimmy57** » 23 Oct 2013, 22:03

The belt is not long enough to have slack needed to jump. Your toughest part of this job will be getting the belt over the gears with tensioner compressed and latched. It is easiest to put it over exhaust gear last. Once on the gears you check for all your marks and then pull the pin. Your 99 will have hydraulic ram against smooth pulley as the tensioner style. Like 960s, 850s, and the early S70/V70

SimLyons · Post by **SimLyons** » 24 Oct 2013, 00:00

Perfect and thanks again! I'll go for it this weekend.

Post by **Oly_850** » 26 Oct 2013, 21:18

Honestly I wouldn't do this job on an 850 / V70 or S80 without them. The VVT makes this especially true.