Rocker Order Question

[mtelliott]

I'm in the middle of the rebuild and noticed that the rockers were not ordered as to the sequence when they were pulled out.

The machine shop conditioned the rocker surfaces (not sure what that means) but my question is, am I hosed. Can I install the rockers with the micropolished cams? What's the worse that could happen?

Thanks for all your help. The engine block is together. I start the P&C's tomorrow. With the help of a good friend that made all the mistakes of building one before, the rebuild is starting to flow.

[Bobboloo]

Once the rockers are re-conditioned I don't think the order matters anymore.

I think however that ideally the cams would be re-ground as well in this scenerio. I'm not sure if micropolishing "squares" them up. Maybe someone else can chime in on that.

[911pcars]

Typically, here are the different scenarios during reassembly:

-No change to rockers or cam = Reinstall rockers in the same location

-New or resurfaced rockers = Reinstall rockers in any location. No need to regrind cams.

-New cams = resurface rockers, then install in any location

To allow these new metal surfaces to "break in", apply a high film strength moly lube during assembly.

Sherwood
http://members.rennlist.org/911pcars

[mtelliott]

What exactly do they do when the resurface the rockers? Does anyone really know? I know they put new sleeves in but what do they do to the surfaces?

[911pcars]

They reface the rubbing surface of the rocker arm; basically grind in a fixture so the friction surface is smooth and contoured.

Sherwood

[Wayne 962]

"micropolished cams" - what exactly does this mean?

-Wayne

[911pcars]

"Micropolished". I would think..... very shiny, thus very smooth, thus less friction. I'm referring to the hardened cam lobes rather than the cam bearing journals which should probably have the same treatment though not as critical as the unit loading isn't as high. Crankshaft main or rod bearing journals are also micropolished. You an achieve the same results by starting with a highly machined surface; spin it up to speed and evenly apply various grits of paper w/lubricant, finishing up with crocus cloth.

However, I've seen many aftermarket cams with a dull dry coating applied that's suppose to ease the break in period - still shiny underneath though.

Sherwood