When putting together the pushrod engines, do people favor paper
gaskets with non-hardening Permatex (or other?) or is the silicone
from GM (brownish orange) or Locktite’s ‘‘right stuff’’ (black)
favored these days? What are the reasons for favoring one method
over another? Are some joints better served one way or another?
I’ve started reassembling the 3 1/2 liter pushrod. A full gasket
set is in hand and the silicone RTV is available also. I don’t care
too much about eventual oil seepage. Thanks for your thoughts.–
Roger McWilliams
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
Roger -
I had to replace the head gasket on my '49 3.5L engine (in my '38
Hybrid) 4-1/2 years ago and the third gasket finally held up. It seems
that the original and the first replacement were of the “sandwich”
type. It lasted a year. The one that worked was a modern, one-layer
gasket. Wally Vorlaufer in S. Africa (vorcomp@netactive.co.za) clued me
in and sold me the good one. (Partial text of his 2003 email follows as
a “P.S.”) And as I remember, the one-layer gasket did not need any
special stuff like Locktite.
Whatever, the car has run like the Energizer Bunny ever since. The
only thing noted was that with the thinner gasket and resulting higher
compression, it “pinged” on acceleration and this was solved by using
high octane gas.
Larry
'38 SS Sports Tourer (Rebodied in NZ)
P.S.
…the copper gaskets are very problematic.
The gaskets that we manufacture are modern type compound gaskets, using a
compression plate no C1546 was a very old system only used with low grade
fuel.
This is definitely not used any more!
Roger McWilliams wrote:>When putting together the pushrod engines, do people favor paper
gaskets with non-hardening Permatex (or other?) or is the silicone
from GM (brownish orange) or Locktite’s ‘‘right stuff’’ (black)
favored these days? What are the reasons for favoring one method
over another? Are some joints better served one way or another?
I’ve started reassembling the 3 1/2 liter pushrod. A full gasket
set is in hand and the silicone RTV is available also. I don’t care
too much about eventual oil seepage. Thanks for your thoughts.
Whatever you do, don’t forget to hook up the oxygen sensor (see eBay
Item number: 330046634469) before rebolting the exhaust headpipes in
place.
Craig
628345— Roger McWilliams mcw@uci.edu wrote:
When putting together the pushrod engines, do people favor paper
gaskets with non-hardening Permatex (or other?) or is the silicone
from GM (brownish orange) or Locktite’s ‘‘right stuff’’ (black)
favored these days? What are the reasons for favoring one method
over another? Are some joints better served one way or another?
I’ve started reassembling the 3 1/2 liter pushrod. A full gasket
set is in hand and the silicone RTV is available also. I don’t care
too much about eventual oil seepage. Thanks for your thoughts.
I have had the best results with Permatex No. 2 on paper or cork gaskets for
sealing oil, but for sealing water or anti-freeze I have had better results
with blue or copper silicone. The best sealant we’ve found at my lab for
chemicals is GE grey RTV silicone, but this stuff sticks so well its a bear
to get off again if you had to.
On the head gasket, I have used the single sheet formed copper type twice on
my Mark V without any sealant, and the first time after 8 years and a couple
thousand miles it developed a leak where oil got into the water. I did not
have any leakage the second time. I would be interested to hear other
opinions on using sealant on this type of gasket. On the XK list they go
both ways here.
paper
gaskets with non-hardening Permatex
Ha, ha. Do another search and see if it fits electric cars. I couldn’t
figure out if this was the usual ebay address pfishing scam, or just
somebody typing up their web page was told it would fit all cars, and Mark V
happened to be already on their list among “all cars”. Hope the EPA greenies
don’t get the idea that Mark V’s are supposed to have one.
oxygen sensor (see eBay
Item number: 330046634469)
I used on my Mk IV “BLUE HYLOMAR” It was easy to apply and sealed
surfaces using also the paper seals that were supplied whit the engine
kit
Regards
Benny-----Original Message-----
From: owner-pre-xk@jag-lovers.org [mailto:owner-pre-xk@jag-lovers.org]
On Behalf Of Roger McWilliams
Sent: Monday, November 06, 2006 9:35 PM
To: pre-xk@jag-lovers.org
Subject: [pre-xk] Silicone or Real?
When putting together the pushrod engines, do people favor paper
gaskets with non-hardening Permatex (or other?) or is the silicone
from GM (brownish orange) or Locktite’s ‘‘right stuff’’ (black)
favored these days? What are the reasons for favoring one method
over another? Are some joints better served one way or another?
I’ve started reassembling the 3 1/2 liter pushrod. A full gasket
set is in hand and the silicone RTV is available also. I don’t care
too much about eventual oil seepage. Thanks for your thoughts.
