6 replies to this topic

[Uncle Boost]

-=2000 S80 T6=-
Volvo Brethren.... S80 Gurus...or better yet, V VT masters...Question about this V VT Exhaust Camshaft and loading the V VT Hub..(I put a Space between the V's so it doesn't look like a "W") Any, I have the center bolt loose, and snugged to the point where I can turn the center V VT hub unit to its mechanical stop but when I let it go it springs back. Keep in mind I have the camshaft in my hand and not in the head yet. Still trying to get an understanding on how this should be done. According to the procedure, you loosen the Cam sprocket and rotate CW to limit (Bolts are limit far left) snug. Now rotate V VT hub CW until it stops. I do this but it springs back by hand if I really put some Twist on it like I'm rotating against an internal spring or tension. NOW once I get the Cams in the Cover, Locked, installed, torqued cover down, and perform this same procedure, do I Lock the the V VT hub to 120nm with it turned FULLY CW AGAINST the internal spring tension? Or let it spring back then Torque to spec? -=OR=- SPRUNG back like when you let it go and no force is on the internal spring Damper??? internal Spring force TENSIONED fully ------>CW and Torque the center bolt? I hope this isn't as confusing to read as it is to type. ..Geeze!

-=UB=-

[Ihatespeedbumps]

The Volvo instructions are clear as mud. Here is what I do.

First of all that particular hub is spring loaded, and the belt must be installed while it's in the limit position. What you need to do is lock the cams from the rear and install the hub so it's about 2.5 teeth from the timing mark. Gently snug the center bolt and rotate the hub to it's limit position, ensuring your timing marks line up. If they don't loosen the center bolt and adjust accordingly, don't mess with the three screw securing the cam gear to the hub.. Once you've found where the hub should be at it's rest position, torque the center bolt to spec. Install the plug and proceeded with installing the timing belt. When you put the belt on you'll need to rotate the hub to it's limit position (timing marks aligned) or you'll have a check engine light.

[Uncle Boost]

Ihatespeedbumps, on 10 December 2011 - 06:19 PM, said:

The Volvo instructions are clear as mud. Here is what I do.

First of all that particular hub is spring loaded, and the belt must be installed while it's in the limit position. What you need to do is lock the cams from the rear and install the hub so it's about 2.5 teeth from the timing mark. Gently snug the center bolt and rotate the hub to it's limit position, ensuring your timing marks line up. If they don't loosen the center bolt and adjust accordingly, don't mess with the three screw securing the cam gear to the hub.. Once you've found where the hub should be at it's rest position, torque the center bolt to spec. Install the plug and proceeded with installing the timing belt. When you put the belt on you'll need to rotate the hub to it's limit position (timing marks aligned) or you'll have a check engine light.

ok so when you mention the term "Limit position" do you mean turning the hub until you feel resistance on the hub and continuing against the spring tension until it reaches its mechanical physical stop? Then Torque the Center Bolt? And the Volvo instructions said 1.5 teeth from the mark instead of 2.5.. Please clarify and thank you for helping.

-=UB=-

[Ihatespeedbumps]

Sorry, yes 1.5 teeth. Limit position is when you rotate the hub clockwise and it reaches it's physical stop. At that point your timing marks should be properly aligned with the upper cover.

[Uncle Boost]

Ihatespeedbumps, on 11 December 2011 - 03:09 PM, said:

Sorry, yes 1.5 teeth. Limit position is when you rotate the hub clockwise and it reaches it's physical stop. At that point your timing marks should be properly aligned with the upper cover.

Ok... so there should be tension on the spring (Full Mechanical Stop) THEN torque the Center Bolt to 120nm? So at this point, I will NOT be 1.5 teeth away but Dead Nuts on the Mark on the uper Cover? Also, when we speak of Teeth are we talking the CROWN of the Tooth or VALLEY?
Tooth gear crown (notch) ----> n or u <-------valley . Its becoming clear now with the term "Load" up the V V T hub.. just need to know where I should be once locked and loaded, and where my tooth should be...

[Uncle Boost]

Ihatespeedbumps, on 10 December 2011 - 06:19 PM, said:

The Volvo instructions are clear as mud. Here is what I do.

First of all that particular hub is spring loaded, and the belt must be installed while it's in the limit position. What you need to do is lock the cams from the rear and install the hub so it's about 2.5 teeth from the timing mark. Gently snug the center bolt and rotate the hub to it's limit position, ensuring your timing marks line up. If they don't loosen the center bolt and adjust accordingly, don't mess with the three screw securing the cam gear to the hub.. Once you've found where the hub should be at it's rest position, torque the center bolt to spec. Install the plug and proceeded with installing the timing belt. When you put the belt on you'll need to rotate the hub to it's limit position (timing marks aligned) or you'll have a check engine light.

Ohhhhh ...Ok..so the hub is supposed to be at it's REST position when it's 1.5 teeth away from the mark, and Dead Nuts on when you rotate it to it's Limit Position when the belt is being installed. Meaning the there is SOME spring tension working against the belt and also keeps the tension a bit between the Intake gear sprocket and the Exhaust gear sprocket. Please tell me thats it! I was thinking you turn it to its limit position THEN torque the bolt down so it wouldn't (Won't) spring BACK to it's rest position.

-=UB=-

[Ihatespeedbumps]

Uncle Boost, on 13 December 2011 - 12:58 PM, said:

Ohhhhh ...Ok..so the hub is supposed to be at it's REST position when it's 1.5 teeth away from the mark, and Dead Nuts on when you rotate it to it's Limit Position when the belt is being installed.

Correct.

Also, the belt is installed counter clockwise so you'll need to hold the hub at limit position and install the belt.

If you install it clockwise, yes it would help hold the hub but the slack would be in the wrong place on the belt, resulting in improper belt tension

I've been kicking around the idea of making a how to video on this, hopefully to make things easier to understand.