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Leaking Oil Filler Neck

Old 11-03-2011, 10:17 PM
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heinrich
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Default Leaking Oil Filler Neck

I've had it with the factory design. Looking carefully at it, it's clear that it was designed to fal. THat little channel sits *inside* the block's opening, meaning that oil is forced into it. Besides that, what keeps oil in? About a 1/64th thick plastic ridge which is prone to slight warpage anyway.

I don't think I've everseen one that didn't leak.

Anyway ... I cut myself a very nice thick gasket from excellent oil gsket material (we're taling 1/64th thick) ... and I'm planing on omitting the stupid fctory seal, and filling that little ridge with non-hardening sealant. Then the gasket, then a thin layer of non-hardening oil-resistant stuff again
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Old 11-04-2011, 12:51 AM
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I suggest to use Hondabond on the new O ring and then whatever other parts your using to put on the oil fill tube,
NOTE 928 INTL makes a n oil block off plate this will also reduce the oil being sent back to the bottom of the spout.
Done more than a few of them this way no leaks
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Old 11-04-2011, 03:24 AM
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Last edited by PorKen; 05-23-2018 at 06:08 PM. Reason: fixed old youtube link
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Old 11-04-2011, 03:45 AM
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Rob Edwards
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Drei Bond 1209 + 928Intl oil filler neck baffle = no oil leaks at the filler neck.

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Old 11-04-2011, 04:13 AM
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you're method will leak, and likely some of the sealant will make it into the pan and get into the filter....
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Old 11-04-2011, 04:18 AM
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Shane
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Or go with the superior metal oil filler neck that came with the '85-'86.5 super-duper GT-Ses...

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Old 11-04-2011, 11:14 AM
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Tom in Austin
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Has anyone put the metal neck on an S4 or GTS? I know the hose connections would be different, but curious if it fits under the later-design manifold ...

My plastic filler neck split at the seam (apparently made in two parts and stuck together) and it was disgusting to spend $70 to put in another one knowing it will eventually come apart again ...
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Old 11-04-2011, 11:17 AM
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SeanR
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Everyone I change out, I use the early style gasket, the thick paper one. Put a bit of Victor Reinz goo on each side and bingo, no more leaking.
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Old 11-04-2011, 11:35 AM
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Thanks Sean. Yes essentially that's what I've made from thick gasket paper. Never knew.there was an alternative (earlier) option.
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Old 11-04-2011, 11:37 AM
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Bob, Stan, didn't know that either... I'll go look.
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Old 11-04-2011, 11:43 AM
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Ohh yes the oil control plate. But how would that prevent the neck leak?
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Old 11-04-2011, 08:14 PM
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that plate stops the oil from hitting the bottom side of the filler tube and if you use a generous amount of HB on both sides of the plate and the lower edge of the fill tube it should be dry from now on
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Old 05-20-2018, 02:40 PM
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Has anyone put the metal neck on an S4 or GTS? I know the hose connections would be different, but curious if it fits under the later-design manifold .
bump

was this question ever answered? been searching about this...…

I have a nice pooling of oil in the valley; how can I determine if my plastic filler neck is split?
hoping this can be done with intake in place?
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Old 05-20-2018, 03:12 PM
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The problem is not the plastic neck, itĺs the seal & the fact that nobody torques this down properly. As the metal & plastic heat at different rates it is crucial that it not be over-torqued. Personally I find the stock seal adequate but stupid. I use self made paper gasket with proper torque. Works perfectly.
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Old 05-20-2018, 03:37 PM
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The plastic necks will warp ‘up’ at the corners. Nothing will stop it from warping. Over-torqued bolts will greatly accelerate the warping.
New filler necks will leak at the seems at the top of the neck unless you pull them apart and thoroughly ‘re-goo’ them.
Can’t win easily. Choose your poison.
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