m4ff3w
m4ff3w Dork
3/8/10 9:46 p.m.

I recently acquired a Volvo 960 that had the upper cylinder head off for quite awhile. The buckets are pitted, so I'm going to snag some "new" ones from PnP and possibly get the earlier cam (+20hp peak but an unquantative less amount "under the curve) but I'm not positive.

I have new valve stem seals, but I'd like to get the valves nice and clean. None are damaged.

Is it imperative to keep them in the same order as they came out? I'd like to drop them in some Chem-Dip, but they would likely get mixed up.

Also, when I get new buckets/HLAs, I'm assuming it would be bad to drop them into the Chem-dip, I should probably just pump them in some clean oil, right?

m4ff3w
m4ff3w Dork
3/9/10 10:03 a.m.

Wow, 24 valves is alot. I took 1/2 of the exhaust out last night.

turboswede
turboswede SuperDork
3/9/10 1:15 p.m.

Yep, they are matched to the seats. You should probably take them to a machine shop to have the new seats put in and the valves ground to match the seats.

iceracer
iceracer HalfDork
3/9/10 6:32 p.m.

Used to use a yard stick with holes drilled to keep the valves in order. Same could be done with a strip of metal.

zomby woof
zomby woof HalfDork
3/9/10 6:49 p.m.
turboswede wrote: Yep, they are matched to the seats. You should probably take them to a machine shop to have the new seats put in and the valves ground to match the seats.

That's bad advice.

If anything, have the seats, and valves ground. If they're in good shape, you can probably get away with lapping them. Don't ignore the guides. Make sure they're OK before you do anything else.

m4ff3w
m4ff3w Dork
3/9/10 7:17 p.m.

What do I do to check the guides?

turboswede
turboswede SuperDork
3/9/10 9:28 p.m.

Zomby, thanks that is what I meant. Posted in a hurry on that one.

To check the guides you pull the valves, springs and seals. Then you measure the valve stem diameter and then measure the diameter of the inside of the guide at the top, bottom and at least one spot in the middle. There should be a spec for their wear. You should also make sure to check that the guides haven't moved down the bore (some head designs do this, but not all)

To keep track of any drift from spec, keep the valves and the hardware in order.

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