Erik
The .84mm standout is for XD2, .79mm for XD2S (and XD3T I assume).
Don't rely on Altrom, or any other non-specialist website for accurate
application information. Ask for brand information--there are some cheap
gaskets out there.
Also, there is a widespread misconception that the gasket thickness on XD
engines has something to do with resurfacing of the head. It does NOT! It
has to do exclusively with the piston standout. Milling the head has next
to no influence on compression ratio, because the bulk of the combustion
chamber is inside the swirl chamber which has but a narrow mouth on the
face of the head. There is a little volume in the valve cutouts, but the
valves and seats are usually ground when the head is milled, recessing them
enough to compensate for the volume of the cutout lost by milling.
This is a serious and widely prevalent misconception which I believe is
responsible for a lot of crappy-running diesels. In my experience, more
than 95% of diesels came with 2-notch (1.58mm) gaskets originally, and
should have a 2-notch replacement, but I estimate that about 75% of
headgaskets sold (not by me!) are 3- or even 4-notch.
My advice is, if you take off a 2-notch gasket, and you don't see valve
marks on the piston tops, put one back. If you take off a 3-notch, measure
the standout and replace accordingly, which will probably be with a
2-notch, because some misinformed or lazy ("Play it safe--use the thick
one") tech has been in there before. Checking my sales records, of the
latest 40 headgaskets I have sold after issuing the above advice, 39 have
been 2-notch.
On the issue of headbolts, the later TTY bolts, threaded more than half way
up, are much better than the early bolts, and should be retrofitted on TD
and XD2C engines that don't have them already. They can be reused five
times, but they usually won't be because they are much more effective at
holding the gasket, so the head may not have to come off again until it
cracks. TheTTY bolt heads look just like the early bolts so you have to
pull one to tell which bolts you have on a pre-'86 engine.
My two-bits worth.
Brian Holm
At 04:14 PM 1/23/2005, Erik Lane wrote:
>I know about all that. My question was because on the altrom website
>it states that the cutoff mark between using the different thicknesses
>of gasket is at .84mm piston projection above the block and in the
>Peugeot factory manual it says the cutoff is at .79mm. I was wondering
>about the .05mm discrepancy.
>
>Sorry if I wasn't clear. I'm not very good at making sense in written
On
>words all the time... :(
>
>Thank you Abel for the contact info for Disortex!
>Erik
>
>
>On Sun, 23 Jan 2005 00:38:21 -0800, Joseph Ashment
><wyofisher@earthlink.net> wrote:
> > I don't know about those numbers as I don't have a parts manual. What I do
> > know is that there are different thicknesses of headgaskets for the diesel
> > depending on how much the head has been planed. I believe that it is on
> > the back left (car's left) of the head that you should be able to see a
> > notch or notches in the portruding headgasket. These notches tell you how
> > thick of one to order. never heard of altrom, if they can't help, try
> > Brian Holm or Western Hemispheres, I have found both to be very good.
> > There is another good supplier known on the list, but the name escapes me
> > right now.
> >
> > Joe
> >
> > > [Original Message]
> > > From: Erik Lane <eriklane@gmail.com>
> > > To: <peugeot-L@yahoogroups.com>
> > > Date: 1/21/2005 1:23:16 PM
> > > Subject: [Peugeot-L] altrom questions
> > >
> > >
> > > I'm going to put a new headgasket in a 1982 505 XD2S that I have and
> > > found their prices to be the best, but their two headgasket choices
> > > have a discrepancy when I compare them to the Peugeot shop manuals
> > > that I have.
> > >
> > > One their website they say:
> > > Head Gskt PISTON .84mm-UP OVER DECK BG050 $41.20
> > > Head Gskt PISTON TO .84mm OVER DECK BG160 $50.60
> > >
> > > but in the shop manual it says that the cutoff is at .79mm. Does
> > > anyone know why there's this difference? A slightly different
> > > thickness of gasket, perhaps? A simple error by someone along the way
> > > in data entry?
> > >
> > > Also has anyone ordered from them before and if so how were they?
> > >
> > > Here's the website:
> > > <http://www.altrom.com>http://www.altrom.com
> > >
> > > Thanks!
> > > Erik
> > >
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 Sun Jan 23 17:51:39 2005
