Home » Public Forums » GMCnet » Oil breather rubber, vacuum delay valve
| Oil breather rubber, vacuum delay valve [message #359028] |
Mon, 28 September 2020 09:52  |
Greg C.
Messages: 224
Registered: October 2019
Location: Knoxville, TN
Karma: 0
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On the oil breather vent, left valve cover to air cleaner, there is a piece of rubber on either end of the connecting steel tube.
Are these available new? Mine are in poor condition. Did not see them on Jim K's site.
My 403 is missing the vacuum delay valve in the TVS circuit. I am replacing all the vacuum lines and want to get that fast-idle-when-hot feature working again. If I use the part number from the parts catalog, will I be able to find that piece somewhere?
Thank you.
Greg Crawford
KM4ZCR
Knoxville, TN
"Ruby Sue"
1977 Royale
Rear Bath
403 Engine
American Eagle Wheels
Early Version Alex Sirum Quad bags
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| Re: [GMCnet] Oil breather rubber, vacuum delay valve [message #359033 is a reply to message #359028] |
Mon, 28 September 2020 10:02  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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I worked on this stuff when it was new. It didn't work then, and there is a
very good chance that it won't work today, with the gasoline we have to
contend with. If your engine is overheating, you have a RADIATOR AND FAN
CLUTCH PROBLEM, not an emissions issue. I would strongly advise you to not
screw around trying to get obsolete emission equipment to work. For the
costs involved, you will be better served to building air dams, shroud
improvements, fan clutch, etc. Just my humble opinion. It's your money,
spend it how you wish.
Jim Hupy
Salem, Oregon
On Mon, Sep 28, 2020, 7:52 AM Greg Crawford via Gmclist <
gmclist@list.gmcnet.org> wrote:
> On the oil breather vent, left valve cover to air cleaner, there is a
> piece of rubber on either end of the connecting steel tube.
>
> Are these available new? Mine are in poor condition. Did not see them on
> Jim K's site.
>
>
> My 403 is missing the vacuum delay valve in the TVS circuit. I am
> replacing all the vacuum lines and want to get that fast-idle-when-hot
> feature
> working again. If I use the part number from the parts catalog, will I be
> able to find that piece somewhere?
>
>
>
> Thank you.
> --
> Greg Crawford
> Knoxville, TN
>
> 1977 Royale
> 403
> Rear Bath
> American Eagle Wheels
> Alex Sirum Quad bags
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: Oil breather rubber, vacuum delay valve [message #359052 is a reply to message #359028] |
Mon, 28 September 2020 14:50 |
Greg C.
Messages: 224
Registered: October 2019
Location: Knoxville, TN
Karma: 0
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Jim, as far as I know, I don't currently have an overheating problem. My temp gauge reads about 3/8 or a little less, which is, as everyone says, too warm. But at that temp, my thermostat housing reads about 204 degrees with my laser IR themometer. And that's where it ran for about 1000 miles all the way back from Texas in 95 degree heat and high humidity. It read just about that yesterday on the interstate at 65 mph for about 2o minutes, and just a needle width higher on the secondary road at 55 for another 30 minutes, never exceeding 3/8. Being a 1977, it already has the desirable radiator ducting from the factory, but I may put in the side vents. I do plan to install the other NAPA temp sending unit with normal at halfway.
In reading the 77-78 supplemental service manual, it is stated that the TVS/vacuum delay valve/thermostatic valve system detects idle temps in excess of 205 degrees or so, and feeds the vacuum advance enough to increase idle speed to give more fan cooling, more water pumping, etc., to drop that temperature. I don't think it has much to do with emissions, but maybe in response to other emission controls.
That being said, I would like to put everything back to stock configuration with working parts as this system is part of the distributor vacuum advance circuit. The TVS valve is not currently being used, but I would test it or replace it if it is not working correctly. I've been told by others that when everything is right, it all works well.
I know you and others have stated that it is not good to idle an Oldsmobile engine due to lack of top end oiling at low RPM, and I try to comply with that when possible.
I'm now trying to get my idle under control with a newly rebuilt carburetor, and I'm replacing all the vacuum lines, so this was part of my vacuum line project.
Thank you for your advice and observations. It is greatly appreciated as always.
As to my original questions regarding the oil breather rubber connectors and the TVS valve, any response on those?
Greg Crawford
KM4ZCR
Knoxville, TN
"Ruby Sue"
1977 Royale
Rear Bath
403 Engine
American Eagle Wheels
Early Version Alex Sirum Quad bags
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| Re: [GMCnet] Oil breather rubber, vacuum delay valve [message #359054 is a reply to message #359052] |
Mon, 28 September 2020 15:31 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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I have a local supplier that has been in business since about 1946 or so.
They have undergone changes in ownership, etc. and now go by the name of
Baxter Auto Parts.
The real value of this vendor lies in the collective knowledge of
those grey haired counter elves. That, and those old paper catalogs under
the counter that they drag out every time I walk in the door and cross that
cracked concrete floor into that dimly lighted building. Hoses and v-belts
hang from the exposed rafters. So, when I come in with a rubber part like
those molded hose ends, it is an even bet that they are familiar with them.
Can't buy that knowledge, it is either passed on or dies with those
grey hairs.
Will Advance Auto Parts Or Rock Auto and their computer nerds ever
compare with that human knowledge base? I really doubt it.
So, are those rubber bits still available? Depends upon where you
look, I guess. Yes, I feel lucky to have connections like Baxter Auto
Parts. And I support them every chance I get.
Jim Hupy
Salem, Oregon
On Mon, Sep 28, 2020, 12:52 PM Greg Crawford via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Jim, as far as I know, I don't currently have an overheating problem. My
> temp gauge reads about 3/8 or a little less, which is, as everyone says, too
> warm. But at that temp, my thermostat housing reads about 204 degrees with
> my laser IR themometer. And that's where it ran for about 1000 miles all
> the way back from Texas in 95 degree heat and high humidity. It read just
> about that yesterday on the interstate at 65 mph for about 2o minutes, and
> just a needle width higher on the secondary road at 55 for another 30
> minutes, never exceeding 3/8. Being a 1977, it already has the desirable
> radiator ducting from the factory, but I may put in the side vents. I do
> plan to install the other NAPA temp sending unit with normal at halfway.
>
> In reading the 77-78 supplemental service manual, it is stated that the
> TVS/vacuum delay valve/thermostatic valve system detects idle temps in
> excess
> of 205 degrees or so, and feeds the vacuum advance enough to increase idle
> speed to give more fan cooling, more water pumping, etc., to drop that
> temperature. I don't think it has much to do with emissions, but maybe in
> response to other emission controls.
>
> That being said, I would like to put everything back to stock
> configuration with working parts as this system is part of the distributor
> vacuum
> advance circuit. The TVS valve is not currently being used, but I would
> test it or replace it if it is not working correctly. I've been told by
> others
> that when everything is right, it all works well.
>
> I know you and others have stated that it is not good to idle an
> Oldsmobile engine due to lack of top end oiling at low RPM, and I try to
> comply with
> that when possible.
>
> I'm now trying to get my idle under control with a newly rebuilt
> carburetor, and I'm replacing all the vacuum lines, so this was part of my
> vacuum
> line project.
>
> Thank you for your advice and observations. It is greatly appreciated as
> always.
>
> As to my original questions regarding the oil breather rubber connectors
> and the TVS valve, any response on those?
>
>
> --
> Greg Crawford
> Knoxville, TN
>
> 1977 Royale
> 403
> Rear Bath
> American Eagle Wheels
> Alex Sirum Quad bags
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: Oil breather rubber, vacuum delay valve [message #359058 is a reply to message #359028] |
Mon, 28 September 2020 18:50 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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My 77 455 has working TVS and no delay. I guess that was a 403 or Calif thing? I would run C to carb ported, M to manifold and D to Distributor and it should work in an overheat situation. Nice feature. Sorry I don’t have the vac schematic up to offer more help. There is a guy at the B.O.P.C swap meet in February at Kane County Fair grounds with lots of NOS GM / Delco small boxed parts and I think he has a book with listed inventory, otherwise it’s impossible to look through that many dusty boxes. I can keep my eyes pealed if the show is not canceled. Please post the PN.
John Lebetski
Woodstock, IL
77 Eleganza II
[Updated on: Mon, 28 September 2020 18:51] Report message to a moderator |
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| Re: Oil breather rubber, vacuum delay valve [message #359060 is a reply to message #359028] |
Mon, 28 September 2020 18:59 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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For the 2 rubber grommets and GM filter, go to my friends site HIGHWAYSTARS.NET. He is a Delco GM dealer and Buick stole these old parts from Olds shelves for the Turbo Regals and GNs. Search “breather filter” and all 3 come up. The real GM filter has much more oil blocking media in the can than aftermarket junk. I’m slowly having him add more TZE parts as well.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Oil breather rubber, vacuum delay valve [message #359064 is a reply to message #359028] |
Mon, 28 September 2020 19:12 |
Greg C.
Messages: 224
Registered: October 2019
Location: Knoxville, TN
Karma: 0
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Senior Member |
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Thanks John. I bought my combination valve from Hiway Stars! I'll have to get my parts book out and track down the vacuum delay part number.
Greg Crawford
KM4ZCR
Knoxville, TN
"Ruby Sue"
1977 Royale
Rear Bath
403 Engine
American Eagle Wheels
Early Version Alex Sirum Quad bags
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| Re: Oil breather rubber, vacuum delay valve [message #359070 is a reply to message #359028] |
Mon, 28 September 2020 21:02 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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99.9% of the time the TVS sends ported vacuum. Mine has kicked over to manifold twice in 12 years. Both were very hot days cruising at speed, then hit sudden stop and go traffic. Worst case scenario. It worked and also helps a bit with AC function.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Oil breather rubber, vacuum delay valve [message #359090 is a reply to message #359028] |
Tue, 29 September 2020 12:45 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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Greg C. wrote on Mon, 28 September 2020 09:52On the oil breather vent, left valve cover to air cleaner, there is a piece of rubber on either end of the connecting steel tube.
Are these available new? Mine are in poor condition. Did not see them on Jim K's site.
My 403 is missing the vacuum delay valve in the TVS circuit. I am replacing all the vacuum lines and want to get that fast-idle-when-hot feature working again. If I use the part number from the parts catalog, will I be able to find that piece somewhere?
Thank you.
Is this what you are looking for?
https://www.rockauto.com/en/catalog/oldsmobile,1976,toronado,7.5l+455cid+v8,1225741,exhaust+&+emission,pcv+(positive+crankcase+ventilation)+grommet,11785
For other stuff, go to https://www.rockauto.com
Select Oldsmobile and go from there. They have got a lotta old stuff there. JWID
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: Oil breather rubber, vacuum delay valve [message #359092 is a reply to message #359028] |
Tue, 29 September 2020 13:36 |
Greg C.
Messages: 224
Registered: October 2019
Location: Knoxville, TN
Karma: 0
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Senior Member |
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Thanks so much! I need to look closely at the parts I need, some of the Rock Auto parts may work.
There is the crankcase breather cap, and there is a metal tube that goes from the crankcase breather cap to the air filter. There is a rubber fitting on each end of that tube, and those are the ones I need to look at more closely. Rock Auto lists all those parts as PCV valve grommets, although some may be what I am looking for and mislabeled.
Thanks again.
Greg Crawford
KM4ZCR
Knoxville, TN
"Ruby Sue"
1977 Royale
Rear Bath
403 Engine
American Eagle Wheels
Early Version Alex Sirum Quad bags
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| Re: Oil breather rubber, vacuum delay valve [message #359094 is a reply to message #359028] |
Tue, 29 September 2020 14:59 |
Greg C.
Messages: 224
Registered: October 2019
Location: Knoxville, TN
Karma: 0
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Senior Member |
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Thank you for the suggestions. I was unable to find anything at JEGS, but I was able to find all the rubber parts, crankcase breather cap, PCV valve, and Wix transmission filter at Rock Auto.
My parts book turns out to be for an earlier coach, and shows the 455, not the 403. It also did not have a vacuum delay valve on that engine evidently, so I was unable to find the part number for it. The rubber
pieces I needed were also different from the 455, so I have no numbers for those either.
On the Bdub site parts manuals are listed, but evidently the link does not work, so I couldn't find the part numbers there either.
Thanks again for the help!
Greg Crawford
KM4ZCR
Knoxville, TN
"Ruby Sue"
1977 Royale
Rear Bath
403 Engine
American Eagle Wheels
Early Version Alex Sirum Quad bags
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| Re: [GMCnet] Oil breather rubber, vacuum delay valve [message #359095 is a reply to message #359094] |
Tue, 29 September 2020 18:18 |
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First I've heard of it.
On Tue, Sep 29, 2020, 3:00 PM Greg Crawford via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Thank you for the suggestions. I was unable to find anything at JEGS, but
> I was able to find all the rubber parts, crankcase breather cap, PCV valve,
> and Wix transmission filter at Rock Auto.
>
> My parts book turns out to be for an earlier coach, and shows the 455, not
> the 403. It also did not have a vacuum delay valve on that engine
> evidently, so I was unable to find the part number for it. The rubber
>
> pieces I needed were also different from the 455, so I have no numbers for
> those either.
>
> On the Bdub site parts manuals are listed, but evidently the link does not
> work, so I couldn't find the part numbers there either.
>
> Thanks again for the help!
>
> --
> Greg Crawford
> Knoxville, TN
>
> 1977 Royale
> 403
> Rear Bath
> American Eagle Wheels
> Alex Sirum Quad bags
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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bdub
bdub.net
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| Re: Oil breather rubber, vacuum delay valve [message #359106 is a reply to message #359028] |
Wed, 30 September 2020 08:07 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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We have Advance, O'Rielly's, and AutoZone. We also have Slack Auto Parts, who've been here since 1926 I believe. To compete, Slack has added five stores in the area over the years. Third generation family manager told me, each time they add a store, they send gray hair from the mother ship to set it up and train the people who will eventually run it. One time in maybe five their folks will look at the computer for a part. Most of the time, "Oh yeah we got, just a minute" and they disappear into the back and come out with the part. There's usually a parts house like this pretty much every where if you look. Or go to an independent repair shop and ask.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Oil breather rubber, vacuum delay valve [message #359107 is a reply to message #359106] |
Wed, 30 September 2020 09:34 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Call Nick at our place as we have ALL.
Need to know engine size and year.
If your looking for a Free one, keep looking as we are not a Hobby shop.
Sorry to put it that way, but that is the way the GMC shops need to work.
On Wed, Sep 30, 2020 at 6:08 AM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:
> We have Advance, O'Rielly's, and AutoZone. We also have Slack Auto Parts,
> who've been here since 1926 I believe. To compete, Slack has added five
> stores in the area over the years. Third generation family manager told
> me, each time they add a store, they send gray hair from the mother ship to
> set it up and train the people who will eventually run it. One time in
> maybe five their folks will look at the computer for a part. Most of the
> time,
> "Oh yeah we got, just a minute" and they disappear into the back and come
> out with the part. There's usually a parts house like this pretty much
> every where if you look. Or go to an independent repair shop and ask.
>
> --johnny
>
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> I forgive them all, save those who hurt the dogs. They must answer to me
> in hell
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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