Hi Hugh
The purpose of this recess is to allow for an increase in the thickness of
the fire ring, the folded over edge of the gasket, early engines have one
thickness, later engines have a double (approx) thickness which is supposed
to reduce the likely hood of the gasket failing. This was done to all
Triumph OHV engines after a certain year, and maybe to the OHC's as well. I
don't know whether it works or not, I have a 2.5 PI MKII which should have
had the recess and didn't, driven very hard, and a 2000 MKI also driven
hard, tows big trailers etc, blew the head gasket on the 2000 once after the
first ever replacement in 30yrs due to not re-torquing the head after the
recommended interval. First gasket fitted to the PI when I got it was for
recessed block, neither the cylinders nor the flat bits had a seal, DPO's
"mechanic"? had put silicon RTV gasket round the edges to try and keep the
water and oil in!!!! Yes they were both mixed together as water with oil and
oil with water!!
Graham.
----- Original Message -----
From: "Hugh Fader" <hfader@usa.net>
To: "Triumph Mailing List (E-mail)" <triumphs@autox.team.net>
Sent: Monday, February 25, 2002 10:39 AM
Subject: Purpose of recession on deck around cylinders
| While we were pulling my engine on Saturday, the fellow helping me
commented
| on the recession in the deck at the top of the cylinders. As I understand
| this is only on the later TR6 blocks. What purpose do these serve? It
can't
| be for emissions. My friend is a veteran powertrain engineer. He says that
| this will add crevice volume and increase hydrocarbon emissions.
|
| Just curious if anyone knows.
|
| - Hugh
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