XD90 and XD2 head gaskets do not interchange. But '78 and '80
diesels are both XD2s-- their gaskets are the same. BUT xd2 gaskets
come in different thicknesses to compensate for different amounts of
piston standout from the top of the block. If the pistons stand out
less than .032" you use a 2-notch gasket; if more than .032" you use
a 3-notch. That does NOT change if the head is machined. About 90%
of engines take a 2-notch gasket, yet most gaskets sold are 3-notch,
perhaps helping to explain why many of our diesels are smmoky, hard
to start, low on power, and don't get the fuel mileage they should.
Brian Holm
Parts for Peugeots
At 01:07 PM 1/1/2008, gil benmoshe wrote:
>hi everyone,
>by any chance does anyone know if the heads are all the
>same for the XD90? I want to buy a 504 with a blown head
>gasket; I can only find a head gasket for a 1980 504 diesel
>not a 78 (on rockauto.com). is there a difference? I didn't
>think there was.
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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