Results 1 to 16 of 16

Thread: TR3A Gas Cap

Discussions of Triumph motor cars

  1. #1
    Freshman Member
    Join Date
    Jan 2020
    Location
    Hurst, Texas
    Posts
    5
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    TR3A Gas Cap

    Does anyone know where I might be able to purchase the fiber washer/gasket that sits between the chrome gas cap and the escutheon that connects to the gas tube and gas tank on the rear deck of the 1960 TR3A? I searched my normal suppliers and no one sells the item. The OEM washer for my model year is definitely fiber and not rubber, but a rubber substitute should work if it is not too thick. If a replacement part is not available, has anyone successfully made a washer from gasket material? I am simply trying to help reduce the gasoline fumes that tend to collect in the garage after I have driven the car.

  2. #2
    Yoda
    Join Date
    Feb 2016
    Location
    Macon Georgia
    Posts
    3,099
    Thanks Thanks Given 
    14
    Thanks Thanks Received 
    64
    Thanked in
    60 Posts

    Re: TR3A Gas Cap

    Some of the fumes may be coming from the vent tube on the tank. I have been told they can dribble gas if the tank is full and it is cornered vigorously.

    Are you sure the seal is where the fumes are coming from?

    David.
    TR3A TS75524L

  3. #3
    Yoda CJD's Avatar
    Join Date
    Feb 2011
    Location
    Arlington, TX, USA
    Posts
    5,547
    Thanks Thanks Given 
    6
    Thanks Thanks Received 
    46
    Thanked in
    45 Posts

    Re: TR3A Gas Cap

    I found an Oring at Ace that has been working for several years. The fiber never worked well.

    Most fumes come from the carb jets leaking.
    John

    1955 TR2

  4. #4
    Freshman Member
    Join Date
    Nov 2014
    Location
    Raleigh, NC
    Posts
    17
    Thanks Thanks Given 
    3
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: TR3A Gas Cap

    +1 to leaking carb jets and/or float bowl seals. I recently resealed both carbs and now virtually no gasoline fumes in garage.

  5. #5
    Great Pumpkin TR3driver's Avatar
    Join Date
    Aug 2003
    Location
    Sunny So California
    Posts
    19,552
    Thanks Thanks Given 
    8
    Thanks Thanks Received 
    138
    Thanked in
    129 Posts

    Re: TR3A Gas Cap

    Fuel tank sender was another leak that took me several tries to seal. Weeping at the bottom of the tank can be hard to spot as well, since you can't really see down there and gasoline evaporates so quickly.

    But like John said, the carb jets and the float bowl mounts are probably the most common source of excess odor. They can easily weep so slowly that it never drips. Rub your finger along the bottom then smell your finger. If it smells like gas, there's a leak. The cork seals never lasted more than a year or two for me (under daily usage), nor did the rubber bowl mounts. Changing the gland seals to nitrile O-rings helped a lot, as did installing a heat shield under the carbs (to help keep exhaust heat away from the float bowls and their mounts).
    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
    71-72-73 Stag LE2013LBW waiting OD gearbox rebuild

  6. #6
    Freshman Member
    Join Date
    Jan 2020
    Location
    Hurst, Texas
    Posts
    5
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: TR3A Gas Cap

    David - thanks for your response. I had been alerted once before about the vent tube dribbling when cornering, but my fumes are most noticeable after I run the car for while and then pull back into the garage. It may be normal but I keep trying to isolate the cause and reduce the fumes. thanks!

  7. #7
    Freshman Member
    Join Date
    Jan 2020
    Location
    Hurst, Texas
    Posts
    5
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: TR3A Gas Cap

    Randall - thanks for the hints. My original SU's are in such perfect sync that I always hesitate to touch them, but substituting the cork for nitrile O-rings sounds like it might be worth the risk. I have seen the heat shield in Moss and other catalogs. Do I need to buy one or two of them?

    I know that the problem is related to a heated engine. I do not smell the gas fumes if the car simply sits in the closed garage without running for a week or so. I will work on the SU's first and then tackle the fuel tank sending unit if the new o-rings do not solve the problem.

  8. #8
    Freshman Member
    Join Date
    Jan 2020
    Location
    Hurst, Texas
    Posts
    5
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: TR3A Gas Cap

    Thank you! Your advice is most appreciated!

  9. #9
    Freshman Member
    Join Date
    Jan 2020
    Location
    Hurst, Texas
    Posts
    5
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: TR3A Gas Cap

    CJD - do you think I need to replace all gaskets and seals in the carb jet assembly, or are there certain ones that seem to be most critical?

  10. #10
    Yoda CJD's Avatar
    Join Date
    Feb 2011
    Location
    Arlington, TX, USA
    Posts
    5,547
    Thanks Thanks Given 
    6
    Thanks Thanks Received 
    46
    Thanked in
    45 Posts

    Re: TR3A Gas Cap

    If the carb has been rebuilt in the last 5 years, then you could just replace the jet seals, but if it has been longer or you aren’t sure, then probably best to buy the whole rebuild kit. It’ll save work in the long run.
    John

    1955 TR2

  11. #11
    Great Pumpkin TR3driver's Avatar
    Join Date
    Aug 2003
    Location
    Sunny So California
    Posts
    19,552
    Thanks Thanks Given 
    8
    Thanks Thanks Received 
    138
    Thanked in
    129 Posts

    Re: TR3A Gas Cap

    I'm not familiar with the Moss product; mine came from Joe A. at Alexander Racing. Only one is required. (You may be able to see the ARE logo near the bottom).

    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
    71-72-73 Stag LE2013LBW waiting OD gearbox rebuild

  12. #12
    Jedi Hopeful
    Join Date
    Oct 2018
    Location
    Livermore, Ca
    Posts
    193
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    8
    Thanked in
    8 Posts

    Re: TR3A Gas Cap

    I don't like these heat shields because they go under the carburetors so they can't be removed without removing the carb.
    I made one just like this one (see TR3driver) but with only two bolt holes. It installs over the carb. on the two lower inside bolts.
    Much easier to install and remove when needed.

  13. #13
    Great Pumpkin TR3driver's Avatar
    Join Date
    Aug 2003
    Location
    Sunny So California
    Posts
    19,552
    Thanks Thanks Given 
    8
    Thanks Thanks Received 
    138
    Thanked in
    129 Posts

    Re: TR3A Gas Cap

    Not a bad idea, but I've not found that many reasons to have to remove the heat shield. I put it on in 2012 and it's never been off, even to rebuild the starter and generator, and (eventually) convert the generator to an alternator. I even left it in place when I rebuilt the carbs (although obviously the carbs had to come off).

    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
    71-72-73 Stag LE2013LBW waiting OD gearbox rebuild

  14. #14
    Yoda
    Join Date
    Feb 2016
    Location
    Macon Georgia
    Posts
    3,099
    Thanks Thanks Given 
    14
    Thanks Thanks Received 
    64
    Thanked in
    60 Posts

    Re: TR3A Gas Cap

    Hello Randall

    What Alternator have you used? it looks a bit smaller than the one I used. I notice a wire not connected down by the alternator. A ground wire?

    David
    TR3A TS75524L

  15. #15
    Great Pumpkin TR3driver's Avatar
    Join Date
    Aug 2003
    Location
    Sunny So California
    Posts
    19,552
    Thanks Thanks Given 
    8
    Thanks Thanks Received 
    138
    Thanked in
    129 Posts

    Re: TR3A Gas Cap

    That is a smaller alternator, original application was an 89 Suzuki Swift. Rated 55 amps, but I've seen it put out 60. The smaller size makes it fit the space a lot better than the more common GM alternator. Same belt as the generator, and the belt is actually easier to change! Also made it easier to use a 3-point mount, which I feel is better than the two point mount I was using before.

    I made up a new sub-harness from the fuse box area to the alternator; but forgot to remove the old generator harness before taking that photo. The wire you see is the old field connection for the generator. (Earlier TRs, like mine, used ring terminals to the generator instead of quick connects.) I did remove it later.

    There's a brief slide show at https://imgur.com/a/iiD20
    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
    71-72-73 Stag LE2013LBW waiting OD gearbox rebuild

  16. #16
    Yoda
    Join Date
    Feb 2016
    Location
    Macon Georgia
    Posts
    3,099
    Thanks Thanks Given 
    14
    Thanks Thanks Received 
    64
    Thanked in
    60 Posts

    Re: TR3A Gas Cap

    Thank you.

    Have to make a note of that in case my alternator dies.

    David
    TR3A TS75524L

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •