1999 s80 timing off

az volvo · Post by **az volvo** » 22 Aug 2013, 15:54

my daughters '99 s80 2.9l 6cyl dohc non-turbo had a water pump failure. the result was timing belt failure, bent valves. had the head reworked and reinstalled. i am doing something wrong. with a homemade cam lock for the back (drivers) side i lined the slots up. i dropped a 4in 3/8 extension into the port behind the starter and backed the crank (counter-clockwise) until it stopped. checking the crank mark it pretty much lines up with the mark on the oil pump (it is a little to the left of the mark) instead of the mark being straight up. i dont necessarily have confidence that one or both of the cams are placed correctly or possibly upside down, as i could find no reference to which valves will be open upon replacement of the upper cover. i have tried to reset the vvt (intake) but when i put the tensioner and belt back on, i may get a quarter hand crank until it stops. i am at a loss, but willing to restart the procedure all over if needed.

Post by **precopster** » 22 Aug 2013, 16:12

I'll get a pic up of the cam positions for the B6304S engine soon. You may need to remove the cam cover to re- reference.

az volvo · Post by **az volvo** » 22 Aug 2013, 16:20

thank you Mike, that would be very helpful.

Post by **precopster** » 22 Aug 2013, 17:32

See if this helps at all. Perhaps if you remove the oil cap you can reference one side. Also the slots at the rear of the cams should be horizontal. I played with the cams and found they're not identical and if you confuse inlet for exhaust the slots at rear won't line up. Hope this helps

az volvo · Post by **az volvo** » 23 Aug 2013, 13:05

thank you Mike it does help. and when the crank is at the mark, cyl 3@4 are just past the top going down, does that sound right?does the position you have in the picture matter if there is a vvt or not? and is no 4 cyl going to be open? because the piston is almost at the top or just past the top......

Post by **chrism** » 23 Aug 2013, 14:26

I don't know about year model 1999, but if it's like later models......

You'll notice the slots on the rear (LH) end of the cams do not exactly run across the center of the cams - they are slightly offset from center. When using the alignment tool, the intake cam's slot should be ABOVE center and the xhaust cam's slot should be BELOW center. So on a correct alignment tool, the two tabs that fit into the cam slots should be parallel to each other but they should NOT be on the same plane (not in line with each other). In other words, if you simply use a straight bar running between both cams, the cams will end up being slightly retarded by just smidge.

az volvo · Post by **az volvo** » 23 Aug 2013, 14:33

i do have a straight cam lock bar. so even though the upper timing cover holds the cams in place, there will still be an offset? can i manually set them once the cover is back on or will i most likely bend the valve stem(s)?

az volvo · Post by **az volvo** » 23 Aug 2013, 14:38

does anyone else know if this cam position is the same for a 1999 s80? it was the first year on the changes so it makes it extra confusing if it is the same as others, is there anyone you can ask Mike? thanks.

Post by **precopster** » 23 Aug 2013, 14:59

Chrism's advice is good. Have you sighted the rear cam slots as yet?

VVT doesn't affect firing order or cam reference hugely. I've seen tutorials here in the S80 Repair Database a thread called "S80 top end rebuild" on a T6. Just reference VVT while turning the cam sprocket clockwise. If you overshoot go back to the anti-clockwise stop and turn the cam past that stop to re-reference. Then turn clockwise to the stop again to re-reference.

Treat VVT as if you had really large slots for the front bolts in the cam which allow about 15 degrees of movement, however you always reference when the bolts are at the furthest left of the slots; does this make sense?

If your crank mark is on the mark are the cams close to marks or about 180 degrees out? If so turn the crank 360 degrees as you may simply require another revolution of the crank. The 3 &4 piston position is correct but you could still be 360 degrees out. Remember it's 2 turns of the crank for one rev of the cams; 21 teeth on the crank and 42 teeth on the cams

Post by **chrism** » 23 Aug 2013, 15:07

I'm going to try and attach a photo - wish me luck. If it works you'll see how the slots are oriented. Also, the guy built a cool tool, but he fell short in not getting the tabs offset, so the tool ends up not being parallel to the head surface. The result is the cams being retarded ever so slightly.