Carburetor Insulator Gasket
- Thread starter tundra06
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Reviving an old thread and hoping to maybe clear up a bit of confusion on this topic. I think all the confusion comes from Toyota's million different variants of these carbs and all the holes and things they plugged up to reuse components. I'm in the process of replacing my carb gaskets, as they are basically flaking apart from my carb insulator plates and are quite uneven due to deterioration and uneven swelling. I don't know why some insulator plates would have had a passthrough hole down into the manifold and some wouldn't (maybe someone has a definitive answer for this), but I guess all you can really do is try to stick to what is on your vehicle and hope it is correct. My FJ is an 1982 SA FJ45. The carbs on these are a generic, non-US variant (61012), that seems to be unchanged since 1975 or so. Hopefully these pics will clear up some questions some had in this thread. In the first pic on the side of the insulator that contacts the manifold, you can see the slightest indentation from a hole that was likely filled from Toyota re-using old parts, or modifying existing molds / templates. This filled hole is filled all the way through the insulator. It isn't just the gasket covering it.
If you flip the insulator over, so you can see the side that contacts the carburetor, you'll notice an outward indentation from the insulator paper gasket swelling under vacuum pull on the carburetor hole with the pass-through bolt.
NOTE: at least for my carb version, the insulator plate does not need a hole through it to allow vacuum draw through the passthrough bolt that joins the top and bottom assemblies of the carb. It you look inside this large pass through bolt hole on the carburetor, you'll notice a small hole that opens to the butterfly barrel chamber. This is where the vacuum draw comes from, completing the airflow circuit.
I hope this helps clear things up for others, and maybe someone can chime in with more knowledge as to why the OP's carb insulator had a hole that passed all the way through to the manifold. I've run into so much confusion troubleshooting my carburetor, distributor, etc., because it's so difficult to track down exact parts, what was modified, re-used, etc., on all the different variants of these vehicles...especially dealing with the multiple markets.
....and my manifold base
Hope this helps someone else a bit.
If you flip the insulator over, so you can see the side that contacts the carburetor, you'll notice an outward indentation from the insulator paper gasket swelling under vacuum pull on the carburetor hole with the pass-through bolt.
NOTE: at least for my carb version, the insulator plate does not need a hole through it to allow vacuum draw through the passthrough bolt that joins the top and bottom assemblies of the carb. It you look inside this large pass through bolt hole on the carburetor, you'll notice a small hole that opens to the butterfly barrel chamber. This is where the vacuum draw comes from, completing the airflow circuit.
I hope this helps clear things up for others, and maybe someone can chime in with more knowledge as to why the OP's carb insulator had a hole that passed all the way through to the manifold. I've run into so much confusion troubleshooting my carburetor, distributor, etc., because it's so difficult to track down exact parts, what was modified, re-used, etc., on all the different variants of these vehicles...especially dealing with the multiple markets.
....and my manifold base
Hope this helps someone else a bit.
