To be clear, it's drill two holes, one on either side of the vent tube...
Tony
At 04:28 PM 7/31/2011, Tony Drews wrote:
>Your assembly sounds exactly like mine, and I got it to not leak
>very much this year. The one change I made (due to a dialog on this
>forum a while back) is to:
>1. Make sure that the vent tube that goes through the rear main from
>the rear seal to below the crank is open.
>2. Drill two extra 3/8" holes in the rear main cap parallel to the
>built in vent tube on either side of the vent tube. If you don't
>give the oil any place to go, it will go out the rear main no matter
>HOW good the seal is.
>
>I suspect the above is your issue - you can get a little oil through
>the vent tube (works on the starter) but not a lot of oil through
>the vent tube (doesn't work when engine is running).
>
>The Indian Head Shellac has worked fine for me (and for Uncle Jack)
>for years - that's not your problem. I do not soak the felt for
>more than a few seconds. It does come out both sides of the gap
>between the main and the block and is messy.
>
>Also, make sure that you're not really leaking from somewhere else
>like the cam plug or the end of the main oil gallery. Both of those
>will fill up your bellhousing in no time.
>
>Tony Drews
>
>At 08:23 AM 7/31/2011, J.C. Hassall wrote:
>>Haaaaaalp! I'm at my wit's end. The rear main cap is still
>>leaking ("pouring"?). In the course of maybe 20 minutes run time
>>it dumped ~1/2cup of oil and some drips of sealing shellac.
>>
>>History: This will be the third attempt to seal the leak. I'm
>>using the split seal kit with the incorrect crank dimensions. On
>>the initial build I shortened the spring to 8 3/8" per a phonecon
>>with Uncle Jack. I packed the grooves in the cap with 1" pieces of
>>felt soaked in Indian Head Gasket Shellac and pounded the life out
>>of them. Each side took 7 1" pieces. Some shellac oozed into the
>>block and also on the outside.
>>I cleaned up the inside with lacquer thinner (carefully, to not
>>thin the shellac in the cap). I put a very thin film of RTV inside
>>the seal housing and on the block to housing interface. All seemed
>>good with the world until it dumped LOTS of oil, leading to the
>>current rebuild. Some shellac also dripped from the back of the
>>block down the inspection plate.
>>
>>This time I shortened the spring to 8" and trimmed an RCH from the
>>end of the seal, ensuring that the ends were parallel and had no gaps, etc.
>>Same assembly technique for the cap and seal housing, but with more
>>RTV on the seal housing. I soaked the felt strips in the same
>>Indian Head and pounded them home again. I made a special punch
>>which conformed to the cap groove contours, to ensure that the felt
>>was pounded uniformly.
>>Shellac oozed into / out of the block as before. Shellac also
>>dripped from the hot engine, but only in a few thin threads, not
>>the thick beads as the last time.
>>
>>Before firing the engine this time I cranked it with the starter
>>for 3 sessions of 2 minutes each (best run-time simulation I could
>>think of), with no leaks. I haven't torn down the engine yet (this
>>last leak occurred last night). Clearly I'm doing something wrong,
>>but have no idea what. HAAAAAAAAAAAALP! My suspicion is that hot
>>oil thins the shellac and it pours past the felt strips.
>>
>>TIA
>>
>>jim
>>
>>--
>>Jim Hassall
>>Blacksburg VA
>>'63 TR4 in autox preparation
>>99% finished, 90% to go
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