[Fot] [TR] Sealants used on Fo8 gaskets
Joe Boruch
jaboruch at yahoo.com
Sun Feb 7 12:18:09 MST 2021
When I last raced my TR3 in 2012, the engine had been together for a couple years and I had been using Joe Gibbs XP1 oil for probably 5 years. Never had any problems with it dissolving the Aviation Permatex on the rear seal enough to cause a leak, but I would find pieces of the sealant on the oil pick-up screens. The engine is back together and in the car to race this year, assembled again with the Aviation Permatex on the rear seal. I guess I will need to find another oil. To save some research time, does anyone have suggestions of oil that does not attack the Aviation Permatex? I have been using Shaffers race oils in my Miata. I will need to check with them about compatibility. It would make it easier to have just one flavor of oil in the garage and trailer. Joe B.
On Sunday, February 7, 2021, 10:49:28 AM EST, vfracing--- via Fot <fot at autox.team.net> wrote:
Great point, Paul; As both Dave and I have said in other threads, the Driven/Joe Gibbs oil we use dissolves the Permatex Aviation cement popular for rear main cap side seals and some have indicated they use on the fo8 gaskets.
-----Original Message-----
From: Paul Ricco via Fot <fot at autox.team.net>
To: Friends of Triumph <fot at autox.team.net>
Sent: Sun, Feb 7, 2021 10:16 am
Subject: Re: [Fot] [TR] Sealants used on Fo8 gaskets
FOT,
I have one thought to add to the sealant conversation and I am not intending to restart the entire oil debate by commenting on this. I know that many on the list feel that Brad Penn is the only oil, and that is OK if that is your belief.
However, there are many good race oil choices on the market and more being added every day. Some of the synthetic and synthetic blend race oils have an additive package in them that is very aggressive to some of the traditional sealants. They will actually dissolve them even after they are cured.
My tought here - if you have interest in trying a particular oil you should check with the oil manufacturers tech support regarding sealant compatibility. Do some homework upfront and it will save you from having to tear down a fresh engine to re-seal your rear main gasket, oil pan, etc, etc.
Just my two-sense on the sealant subject.
Paul Ricco
On Feb 6, 2021, at 8:17 PM, Greg Hilyer via Fot <fot at autox.team.net> wrote:
Don’t know if it’s my trick or if everyone does it but... Once I’ve got the liner landing as clean as I can get it, I use a old liner as a hone and by twisting is back and forth with some valve lapping compound, get a nice shiny ring on the block mating face. Clean it up good and then use your sealant of choice.Greg “Lunker” HilyerAlbuquerque NM
On Feb 6, 2021, at 6:30 PM, Frank Fisher via Fot <fot at autox.team.net> wrote:
hylomar.
never sets up solid like silicone.that means you have time to set the liners and go have a scotch, come back, mess around. leave it overnight and take up the task again tomorrow.
the best gasket dressing ever invented.
Frank
On Friday, February 5, 2021, 09:52:33 PM PST, Dan Cronin <adcronin at mi.rr.com> wrote:
FolksLooking for some background information and recommendations on the preferred Fo8 gasket sealing compound that seems to have worked for each of you in your various engine re-builds. And any comments / observations you choose to share either on or off list. The motor I am building has a 89 mm piston and liner kit from BFE along with Corrello rods / bolts and a Crower dummy main crank connected at the front with a ATI Super Damper and at the rear to a Fidanza Alloy Flywheel with diaphragm clutch, an HVDA conversion with alloy drive shaft to a Quaife 4.11:1 diff. and alloy back cover. Stainless Steel valves with 0.050 oversize intake thru Mang. Bronze guides. H/S roller rockers on alloy pedestals. BPNW 270 duration cam. The TR4A head has had 0.040 removed mostly to true things up and remove prior imperfections. The head chambers have been mildly worked to smooth any sharp edges and even things out with a resulting chamber volume of 60.5cc each. I am planning on installing Gasket Works 0.022 copper gasket with their 0.005 “O” compression rings on the head side of the gasket that will be sprayed with a copper coating on each side. Gasket Works sent a set of Fo8 individual gaskets that has allowed me to obtain a liner protrusion of 0.0025 to 0.003. Am aiming at a compression ratio of around 9.75 to 1+/- . Looking forward to as many responses as possible to assist in trying to get this critical step as close to right as I can.DC<IMG_3668.jpeg>** triumphs at autox.team.net **
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