Packard Forum Index » V-8 (1955-56)

1-7/32" Just past the compensator port toward the front. Yes it does seem to be tapered slightly as my ID mic would only go as far as just past the compensator port. Gimme another 5 minutes or so.

Greater than 1-3/32" at the very bottom of the bore. Call it 1-1/8". The only thing i can find 1.00" about this unit is the trip washer on the end of the ram.

Maybe it's just wore out!

LMFAO!

The small traper is most likely there for foundry core removal.

ALSO, about 1/2 inch from the bottom of the bore and at the 6'oclock position there is a peculiar round indentation about 1/16" deep and 3/8" in diameter which pretty much blows my foundry core removal theory for the taper.

Edit, no wait a minute, that mite confirm the foundery core removal theory if the core were in 2wo halves parallel to the bore.

T'Pacman wrote:
"Maybe it's just wore out!

LMFAO!"

OH! yes yes!!! It needs to be sleeved by a qualified, certified, sanctified, christened and cionfirmed and dyed in the wool professional!!! AND done every 3 to 5 years too!!! Gufwah ha ha ha ha ha .

Quote:

Great post, Brian

I'm happy that my semi-informed, unread posting style has resulted in your well-informed, well-read response. (I wear the semi-informed label with pride, y'know -- however I object to being called "unread," as that's one of the things I lernt best at school, and don't ever call me a half-assed mechanic, because I'm almost three-quarters-assed almost all the time.)



Brian, the rest of your post goes on to talk about the extent of the research that would be required to find an engineering drawing and/or more detailed parts information on the BTV as installed in the Packard, and I have complete faith in your ability to accomplish this. However, I will also try to contribute some of my usual semi-information on the subject.

G'day Mates,

Further to the question about the stainless steel liner in the BTV rebuilt for me by Karps of CA, it was a stainless steel sleeve for the master cylinder bore. It wasn't absolutely necessary but was an optional extra to increase the lifespan of the reconditioned master cylinder. Cheers, John

Interesting find today. While doing my AC conversion, needed to take the BTV out but Surprise! (or not), found reservoir was half empty! Was going to take it out anyway to see if I could come up with another way to mount a modern unit but this kind of forces the issue.

This car is a garage queen with very few miles on it since a full body off several years ago and vendor supplied (rebuilt) BTV. No sign of external leaks. The leakage is approx 7ml in the cup and appears the leather piston seal has also got some on it.

Incidentally, the full stroke fluid output is just over 20ml. Of course, in normal operation it will never go full stroke on purpose so probably average pedal application to cylinders would be half that.

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I am 100% convinced that the fluid in the vacuum chamber is caused by the incorrect reservoir cover gasket. Incidentially, all you really need to do is either cut off the gasket around the return port or just turn it around. The lid fits on either way, with the filler cap to the left or the right, therefore the gasket will too.