Chris
Peugeot's instructions call for removing the swirl chambers and
machining the backs of them on two planes to match the amount removed
from the head. Milling machines tend to catch on the swirl chambers
and chatter, ruining the cut. Head grinders on the other hand seem
to do just fine, with just a little inconsequential smearing at the
joints. Minimum head thickness I believe, is 89.35mm. Correct valve
recession from the face of the head should be maintained by grinding
the valves.
BTW, there are several head gasket thicknesses. The correct
thickness is determined by the piston standout above the block, not
by the thickness of the head. About 90% of engines take the 2-notch
gasket, but most gaskets sold are 3-notch, so there are a lot of
engines out there with too thick a gasket and the consequent poor
efficiency. So don't replace a 3-notch with a 3-notch unless the
piston standout requires it.
Also, be sure to replace the headbolts with TTY bolts if your old
ones are threaded less than half way up.
Brian Holm
At 10:00 PM 8/16/2006, chrislee51 wrote:
>Dan,
>
>Please elaborate. I had to really convince my machinist that he
>couldn't just leave them in and use his "special cutter" to skim the
>head. But I wasn't completely sure why.
>
>Chris Lee
>'78 504D
>'79 504D
>
>--- In
><mailto:peugeot-L%40yahoogroups.com>peugeot-L@yahoogroups.com,
>Dan&Alex <midvally@...> wrote:
> >
> > Important! Swirl chambers must be removed for skimming the head, ask
>me how I know.
> > Dan
>
>
Brian Holm, Parts for Peugeots
at Peugeot Holm, since 1969
2120 Maple Hill
Plainfield, VT, 05667
802-454-7132, fax -1310
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Received on Thu Aug 17 10:42:33 2006
