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I need to replace the gasket under my oil filler neck, and would like to install Greg Brown's oil baffle. Can this be accomplished, without removing the intake manifold? I know I need to remove the water bridge.
I need to replace the gasket under my oil filler neck, and would like to install Greg Brown's oil baffle. Can this be accomplished, without removing the intake manifold? I know I need to remove the water bridge.
This is for my 89 S4.
In advance thanks for the help.
Let me know where you get the baffle and how much. My oil filler seal is leaking and this will be on my list of winter projects. Like you I plan to remove the water bridge.
Let me know where you get the baffle and how much. My oil filler seal is leaking and this will be on my list of winter projects. Like you I plan to remove the water bridge.
Hey Greg. I did your baffle on my '84 this summer. Can you clarify if you use a gasket or just sealant? And do you use them on both sides of the baffle flange, i.e. the filler neck side and the block side? If just one side, which? I wasn't sure at the time so I used sealant and a gasket on both sides. Overkill and likely wrong I know. Because of the thickness build up of using two gaskets I had to use longer filler neck bolts.
I just recently installed a Kuhn oil separator removing only the water bridge. It came with paper gasket for bottom and new rubber oil ring type for filler bridge. As suggested by Stan Kolen (mrmerlin), I applied Hondabond4 on all surfaces.
Hey Greg. I did your baffle on my '84 this summer. Can you clarify if you use a gasket or just sealant? And do you use them on both sides of the baffle flange, i.e. the filler neck side and the block side? If just one side, which? I wasn't sure at the time so I used sealant and a gasket on both sides. Overkill and likely wrong I know. Because of the thickness build up of using two gaskets I had to use longer filler neck bolts.
On the early cars, I use Drei Bond only. I put a thin layer between my baffle and the block. I always find and use the stock metal baffle that Porsche made, on top of my baffle. That stock baffle has a rubber o-ring built into it, but most of the o-rings are flat (this part has been NLA for many years and can only be found used.) I put Drei Bond on both sides of this baffle.
I always check the filler necks to see if they are flat....I run them across a big belt sander if the are not flat, (or if they have been powder coated.
Once everything is assembled, I smear the excess Drei Bond, which squeezes out, flat with my finger, to give the whole assembly a "bathtub caulking" around it.
You mentioned the early cars...for an '86.5, would you also follow this procedure? It just so happens I'm getting ready to do this...
Originally Posted by GregBBRD
On the early cars, I use Drei Bond only. I put a thin layer between my baffle and the block. I always find and use the stock metal baffle that Porsche made, on top of my baffle. That stock baffle has a rubber o-ring built into it, but most of the o-rings are flat (this part has been NLA for many years and can only be found used.) I put Drei Bond on both sides of this baffle.
I always check the filler necks to see if they are flat....I run them across a big belt sander if the are not flat, (or if they have been powder coated.
Once everything is assembled, I smear the excess Drei Bond, which squeezes out, flat with my finger, to give the whole assembly a "bathtub caulking" around it.
a little green on this subject; what is the oil baffle mentioned and what is the advantage. thx!
The GB baffle looks like this...
...and is installed in the hole in the block underneath the oil filler/seperator. Without it installed oil is free to be thrown up into the filler neck and ultimately find its way through the breather hoses. The baffle mitigates this.
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
a little green on this subject; what is the oil baffle mentioned and what is the advantage. thx!
On 928's (up to '93 GTS), the filler neck has hoses, at the base, that run back to the valve cover and back to the intake system. These hoses are present to allow the crankcase to breathe and also draw a vacuum on the crankcase.
If you remove the filler neck, you can see the crankshaft and a couple of connecting rods.....which means that when the engine is running, there is a virtual rainstorm of oil being thrown up at the filler neck. The result is at anything over about 3,000 rpms, the air that needs to be removed by vacuum has a huge amount of oil mixed with it. (Oil in the intake air is a bad thing.....reduces the effective octane of the fuel and allows a think layer of oil to bake onto the pistons/rings.)
The result is large amounts of oil being draws into the intake system.
These baffles fit down into the block and help separate engine oil from the air, reducing the amount of oil that can get to the intake system.
One of these baffles is the very first step in improving the crankcase/ventilation system in the stock engine.
10-17-2017, 02:17 PM
Oil baffel
