 Oil cap sticking |
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| jmargush |
 Apr 7 2025, 05:40 PM
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#1
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Member  Group: Members Posts: 470 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176  |
Has anyone had issues with the oil cap gaskets swelling and making it difficult to unscrew the oil cap?
Are there better sources for the gaskets and O-ring? The O-ring was so expanded it wasn't really seated in the groove. And the flat gasket was so swelled that after i got it out I can't get the cap to go back on.  |
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| Superhawk996 |
Apr 7 2025, 07:02 PM
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#2
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914 Guru Group: Members Posts: 6,949 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch 
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EPDM rubber swells when exposed to oil and gas
NBR rubber is what you want |
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| L-Jet914 |
Apr 7 2025, 07:56 PM
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#3
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Member Group: Members Posts: 335 Joined: 24-October 12 From: Davis, CA Member No.: 15,080 Region Association: Northern California |
I know AutoAtlanta carries both gaskets made from Viton rubber 2B and 2C in the factory parts catalog. 914Rubber carries the lower gasket in either viton or neoprene. https://914rubber.com/914/914-engine/114-05...r-neck-bleeding
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| wonkipop |
Apr 7 2025, 08:05 PM
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#4
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Advanced Member Group: Members Posts: 4,751 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille
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you want viton. (IMG:style_emoticons/default/beerchug.gif)
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| Superhawk996 |
Apr 7 2025, 08:07 PM
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#5
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914 Guru Group: Members Posts: 6,949 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(wonkipop @ Apr 7 2025, 10:05 PM)  Ohhh. . . . Big spender (IMG:style_emoticons/default/happy11.gif) |
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| wonkipop |
Apr 7 2025, 08:21 PM
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#6
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Advanced Member Group: Members Posts: 4,751 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille
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QUOTE(Superhawk996 @ Apr 7 2025, 08:07 PM) QUOTE(wonkipop @ Apr 7 2025, 10:05 PM) Ohhh. . . . Big spender (IMG:style_emoticons/default/happy11.gif) L jet mate. only the best. (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/beer.gif) |
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| Mikey914 |
Apr 7 2025, 08:47 PM
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#7
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The rubber man Group: Members Posts: 12,767 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None
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QUOTE(L-Jet914 @ Apr 7 2025, 06:56 PM) I know AutoAtlanta carries both gaskets made from Viton rubber 2B and 2C in the factory parts catalog. 914Rubber carries the lower gasket in either viton or neoprene. https://914rubber.com/914/914-engine/114-05...r-neck-bleeding Viton |
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| jmargush |
Apr 8 2025, 05:33 AM
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#8
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Member Group: Members Posts: 470 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 |
I have seen some posts that there is a different size between 2.0 and 1.8 filler necks.
Does that affect the size of the gasket/seal? Does anyone know if this is true? can anyone confirm dimensions? |
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| bdstone914 |
Apr 8 2025, 06:54 AM
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#9
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bdstone914 Group: Members Posts: 4,872 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
@jmargush
' date='Apr 8 2025, 04:33 AM' post='3200180'] I have seen some posts that there is a different size between 2.0 and 1.8 filler necks. Does anyone know if this is true? can anyone confirm dimensions? [/quote] Yes. The 1.8 filler neck has a screw on cap that has to be vacuum tight. It also has a 20mm hose nipple. |
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| wonkipop |
Apr 8 2025, 11:19 AM
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#10
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Advanced Member Group: Members Posts: 4,751 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille
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QUOTE(jmargush @ Apr 8 2025, 05:33 AM) I have seen some posts that there is a different size between 2.0 and 1.8 filler necks. Does that affect the size of the gasket/seal? Does anyone know if this is true? can anyone confirm dimensions? 1.8s are L Jetronic. different EFI. the cap is also the PCV Valve/flame arrestor all-in-one for L Jet. quite a different beast to the regular cap on a d jet. the sizes are not listed in the parts book (PET) - just that there are two, upper and lower. i'd have to pull the cap off mine to get those sizes and measure with a caliper. which i don't really want to do. the upper one is a normal kind of o-ring, circular cross section. the lower one is a flattened cross section and i would call it a thick gasket rather than an o-ring. the cap compresses down on it. whereas the upper is a side sealing situation of cap to tube. the reason for the two seals is that the cap allows engine fumes to channel to the hose connected to inlet plenum via the space between the cap and the filler tube. i made a sketch of it once when we were doing our L jet research. and it is a sketchy sketch. (IMG:style_emoticons/default/biggrin.gif)  however it does tell you there is one another place these caps can fail besides the two ring seals. there is a diaphram in the top of the cap that allows the fumes to channel or seals the passage off depending on engine vacuum. and if the diaphram fails then you have another source of air leak in an L Jet. given the age of these cars its on the cards these days. so an l jet oil cap really has three seals. the diaphram is the hard one to repair. you would have to pull the upper cap apart to get at it. and then try and find a hydrocarbon resistant diaphram to replace with. |
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