Right, of course! Threw me off a bit with that "85 505TD" in the
subject header.
I have three new xd2 swirl chambers.
Brian Holm
At 04:26 PM 8/18/2006, chrislee51@comcast.net wrote:
>Hey Brian,
>
>Actually, it's a '79 XD2 in a 504.
>
>Thanks for your input!
>
>Chris
>
>-------------- Original message --------------
>From: Brian Holm <peugeots@vtlink.net>
>Chris,
>
>Is this an xd3t (sedan) or xd2s (wagon) engine? I don't know of a
>source for new swirl chambers, but they are different -- xd2s
>chambers have four dimples in the face; xd3t have none. 3t are
>larger inside for the extra displacement.
>
>Brian
>
>At 09:10 PM 8/17/2006, chrislee51 wrote:
>
>>Thanks to Dan and Brian for the responses!
>>
>>I ask because my machinist removed the swirl chambers, machined the
>>head, and turned the chambers on the lathe to reconcile the
>>difference in head thickness. They all protrude .001" and are nice
>>and tight. However, when he turned the chambers, he took material
>>from the face of the chamber, not the tail end. This despite the
>>fact that I left him a photocopy of my factory XD2 manual, outlining
>>the correct procedure. His cutter also apparently got a chip stuck
>>in it when he turned chamber #4, so #4 now has a shallow little ring
>>about of about 5mm diameter gouged into the center of its face. All
>>the chambers were cracked when I removed the head, which I figured
>>was more or less normal. But now I fear that this gouge, which
>>passes over the crack, may have compromised the integrity of that
>>swirl chamber. I am somewhat worried about all of them, but then I
>>am a perfectionist. Is it possible to obtain new chambers?
>>
>>I wish I could afford to open my own machine shop. It would be an
>>interesting sideline business, and of course I would do good work.
>>
>>Chris Lee
>>Seattle, WA
>>'78 504D
>>'79 504D (undergoing engine freshening)
>>
>> >
>> > Chris:
>> > The critical item is the swirl chamber which is hardened steel
>>while the head is soft aluminum.
>> > The two materials also have different rates of thermal expansion.
>> > 2 things will happen if the SC is left in the head for machining.
>> > The 'face' of the SC would be removed which changes the delicate
>>geometry of the SC, removing precious metal which makes the SC
>>thinner where it counts the most, at the interface of the combustion
>>chamber. I am speculating that the SC could overheat and possibly
>>bits break off , combustion also may be less effective. Typically,
>>the swirl chambers develop cracks during normal opera tion with a
>>factory setup, removing 0.010" definitely will create a problem which
>>a machine shop is not likely to 'cover' due to the burden of proof
>>required. The factory specified method calls for the removal of
>>excess material to be taken from the tail end of the swirl chamber.
>> > In my particular case, the machine shop "ground" the head, which
>>loosened the swirl chambers and also caused the uneven removal of
>>metal. When I received the head from the machine shop it was obvious
>>that the SC had not been removed as evidenced by the grinding marks
>>across the faces of the SC. Upon installation the swirl chambers were
>>flush with the face of the head. Three months down the road the head
>>gasket blew. When I removed the head for inspection, the swirl
>>chambers were then recessed below the surface of the head well beyond
>>the factory specification which is flush or very slightly protruding
>>from the head (0.001" is what I recall the max imum was) Mine were up
>>to 0.003" recessed and also were tilted within the bore.
>> > What irked me is that I gave the machine shop the full details from
>>the workshop manual which he ignored. I would have appreciated a
>>phone call to tell me he would not do the work as specified, it would
>>have saved me a lot of grief.
>> > The factory workshop manual contains much useful info on the
>>proceedure, it is worth your while to read it if you are
>>contemplating doing a skimming.
>> > Anyone else want to jump in with an experience on this?
>> >
>> > 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 Fri Aug 18 18:53:21 2006
