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oil cap

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airlifter

Jedi Hopeful
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Is the oil cap on a '69 TR6 supposed to be sealed? I have oil seeping out from under the cap.

I had a problem with the PCV before I rebuilt the engine. When I did the rebuild I replaced the PCV and made sure it sealed in the intake manifold.

Before the rebuild I had oil leaking from between the head and the block. I no longer have that problem.

Thanks in advance, Pete
 
It seems to me, although I'm still new at this, that if you have the SU carbs, then fresh air is drawn in through a filtered oil filler cap. If you have stromberg carbs, then air is drawn through the air cleaners and you should have a sealed oil filler cap (I think the latter is the TR6 setup, right?). The two are shown in poor quality here:

https://www.tr6.org/valve.pdf

If you are getting vacuum through the intake manifold and not through the air cleaner, I believe you need the filtered-type oil filler cap, which is hard to find. I'm trying to fix my TR4a style PCV setup with a hole drilled in the cap. I've also found that many people aren't even aware of that cap's existence (they cite either vented with breather tube or sealed, but the filtered is different) and are just running a sealed type of filler cap with SU carbs. Maybe that's just with the TR4 crowd, though.
 
SMGoose said:
It seems to me, although I'm still new at this, that if you have the SU carbs, then fresh air is drawn in through a filtered oil filler cap. If you have stromberg carbs, then air is drawn through the air cleaners and you should have a sealed oil filler cap.
Click to expand...
But the GT6 has Zenith Strombergs and has the filtered cap.
 
Vented Cap on my 72 GT6 with Strombergs
 
Pete, what's the condition of that gasket seal in the filler cap ?
 
If it's kinda hard, it's not going to seal very well. If it's the original cap, it may be the original rubber seal and time for a replacement.
 
Wait, I thought we just agreed that it shouldn't be a sealed cap at all, right Tony and Jay? Do you guys have the pcv line running from the air filters of from the intake manifold like Pete?

In the link I posted, it says "On the Spitfire and the GT6+ crankcase ventilation is drawn through a filter in the oil filler cap."
 
Sealed cap if we're still talking about a TRiumph TR6, that is.
 
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