What did you do to your Volvo today? Topic is solved

[ZionXIX]

So im planning to rebuild the head with valve replacement and the works. My question is how do I set the timing on the vvt engine since the belt broke?

Single VVT?
There are a couple videos around on how to set things up, but basically, you need to "zero" and lock the cams on the back side, and then deal with rotating the VVT sprockets CW and hold them there (if needed, depending on the hub type) while you install the belt.

Same goes for dual VVT, just more hub hassle to deal with,

Any cam timing changes (if those are happening) need to happen AFTER you get everything in place and the belt on.

Right, but how will I know of the crank is 180 degrees too far? Its my understanding the cams turn at a different rate than the crank.

[abscate]

There is only one position for the crank index to line up. Take the head off.

Now you can set the crank to the mark.

When you put the cams on , install them in their marks.

[foggydogg]

I've put my 850 on the road...

Très bien fait
Joyeux Noël

[foggydogg]

So im planning to rebuild the head with valve replacement and the works. My question is how do I set the timing on the vvt engine since the belt broke?

Single VVT?
There are a couple videos around on how to set things up, but basically, you need to "zero" and lock the cams on the back side, and then deal with rotating the VVT sprockets CW and hold them there (if needed, depending on the hub type) while you install the belt.

Same goes for dual VVT, just more hub hassle to deal with,

Any cam timing changes (if those are happening) need to happen AFTER you get everything in place and the belt on.

Right, but how will I know of the crank is 180 degrees too far? Its my understanding the cams turn at a different rate than the crank.

What Dr. Abscate said; line up the marks first - if you don't already have the head off, carefully move everything until the marks are right.
Keep in mind the crank is NOT on the mark with number one piston at TDC. Believe the mark on the crank pulley.

[bmdubya1198]

What Dr. Abscate said; line up the marks first - if you don't already have the head off, carefully move everything until the marks are right.
Keep in mind the crank is NOT on the mark with number one piston at TDC. Believe the mark on the crank pulley.

This is something very important to keep in mind. Many people don't realize that the timing marks have no relation to TDC on the number 1 (or any) cylinder. Easy mistake to make, considering many engines DO use this as a reference.

[ZionXIX]

I planned on lining up the cam marks with the notches in the cover. Should I wory about truness if there was no overheating?

[abscate]

You should measure the flatness of the head whenever it is off
0.5 MM FLATNESS end to end
0.2 mm flatness lateral

[ZionXIX]

You should measure the flatness of the head whenever it is off
0.5 MM FLATNESS end to end
0.2 mm flatness lateral

What are you guys using for straight edges? These things are expensive.
Slowly gathering my list of parts for the head rebuild.

[abscate]

You should measure the flatness of the head whenever it is off
0.5 MM FLATNESS end to end
0.2 mm flatness lateral

What are you guys using for straight edges? These things are expensive.
Slowly gathering my list of parts for the head rebuild.

You need a machinist square or block for this. Aboutb$35-50

It’s really a good job for a machine shop to wash it in their parts washer, then true it for you. They’ve got all the tools.

[ZionXIX]

Ok, Im gonna check it first and if its questionable then go the machine shop route.
I need you guys to check my list before I place the order.

Water pump
Timing belt
Tensioner
Idler
Accessory belt with tensioner
Front and rear camshaft seals
Cylinder head bolts
Head gasket
Intake valves (10)
Exhaust valves (10)
Intake and exhaust valve stem seals
Intake manifold gasket
Exhaust manifold gaskets
Fuel injector O rings (just in case)
Anaerobic sealant

Have I forgot anything?