Installing Timing Belt, Gears NOT Marked

Gumcrew2 · Post by **Gumcrew2** » 05 Dec 2010, 17:09

I'm helping a friend put a Volvo together (can't argue with $800 for a '99 V70XC turbo).

Whoever dissassembled it did not mark anything, and removed the rear most cam gear/pulley. Anyone got instructions on how to find TDC in both cams and the crank so I can line it all up? I have a Chiltons with pretty clear instructions on how to install the new belt with everything marked/lined up still, shouldn't be a problem from there.

Thanks

Saul

Post by **Ozark Lee** » 06 Dec 2010, 20:28

The cam gears should be marked but the marks are fairly fine. The crank gear timing mark(s) is/are microscopic but the marks can be found.

Here is what the cam gear marks should look like:

: DSC02291.JPG (214.2 KiB) Viewed 6113 times

They are fine marks and they should more or less line up with the V notches on the timing belt cover.

...Lee

Post by **Pauloil** » 06 Dec 2010, 21:28

i've read where you can look at the back of the cams to be sure they are lined up: volvo sells a cam holding tool.

Post by **tjts1** » 07 Dec 2010, 02:52

http://www.volvoclub.org.uk/tech/servic ... vin_57.pdf

Post by **precopster** » 07 Dec 2010, 03:16

Have a look at the above photos; should help somewhat
Note the position of the cam lobes if the above or below head seam is unclear

Gumcrew2 · Post by **Gumcrew2** » 10 Dec 2010, 20:45

So if I align the cams as precopster shows and bolt on the timing gear thats off (the rear/exaust) it "should" be so that the marks on the gears are aligned towards the V at the top as well? That way i'll know I have the gear in the right spot (of 3).

Then set the crank at TDC and call it good to install the belt.

That sound about right?

I'm reading that 25 pages of manual right now...

Post by **precopster** » 10 Dec 2010, 21:55

Look at Ozark's photo; you'll see that the cam sprocket bolts for the exhaust cam are arranged in a pyramid shape. Wire the top bolt to one of the plastic cover torx bolts and on the inlet side you'll have two bolts at the top; wire these to another plastic cover torx bolt & use a similar wooden plate to hold the cams and stop them from falling when you glue the cam cover and the head together. The writer of the tutorial I got the photo from used a 1/4 inch deep sawcut through the wood to create the slot. One of the distributor cap screws can be used to go through one hole and into the head. One of the cam position sensor torx bolts can be used for the other (you'll have to countersink it into the wood as it's short, or just buy a longer bolt) I used this method with great success (no bent valves and timed perfectly) You can't make a mistake as you'll only get afew degrees of movement. Just make sure the steel stock you use is thick enough for a tight fit into the groove you saw. Also if it's a little loose in the cam ends, pack it out. See you on the other side.