Sealing up engine for vacuum pump?
#2494339
05/10/18 12:04 PM
05/10/18 12:04 PM
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Joined: Jun 2008
Posts: 577 Arkansas
Adrielp
OP
mopar
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OP
mopar
Joined: Jun 2008
Posts: 577
Arkansas
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Hi guys, we are getting our bracket car back out after sitting for a few years since my dads passing. We installed a vacuum pump(moroso 22640) on the engine and have discovered that the pump works and is pulling vacuum but it appears the engine is not sealed up as well as it should be for pulling vacuum. My question is where are the typical problem areas that you guys have run into where BBM's struggle to seal most. We want address these issues so we can get the engine sealed up. We plan to pressurize the crankcase and check for leaks but haven't quite gotten that done yet. Any help is appreciated. Thanks
Adriel Paradise Substation Design Engineer III
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Re: Sealing up engine for vacuum pump?
[Re: Adrielp]
#2494387
05/10/18 02:07 PM
05/10/18 02:07 PM
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Joined: Dec 2005
Posts: 11,718 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,718
Fulton County, PA
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Oil dipstick is an obvious leak. Have to plug it. Any caps or breathers in the valve covers as well. Leak test the engine to determine the condition of the ring package.
If the results don't match the theory, change the theory.
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Re: Sealing up engine for vacuum pump?
[Re: Adrielp]
#2494665
05/11/18 09:21 AM
05/11/18 09:21 AM
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Joined: Jan 2003
Posts: 8,037 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,037
Tulsa OK
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When my Dad's engine was on the Dyno the shop used a smoke machine to fill the crankcase and spot the leaks it really highlighted the areas that needed attention.
68 Barracuda Formula S 340
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Re: Sealing up engine for vacuum pump?
[Re: Adrielp]
#2494684
05/11/18 10:32 AM
05/11/18 10:32 AM
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Joined: Feb 2008
Posts: 715 Central TEXAS!!!!
sr4440
super stock
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super stock
Joined: Feb 2008
Posts: 715
Central TEXAS!!!!
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I use a vacuum pump and a air flow meter to measure leakage. The biggest that I have found are the crankshaft seals. In fact if you pressurize the engine with a smoke machine the rear seal doesn't seem to leak, pull 10 inches of vacuum and it's a different story.
Joe
Without Data, you’re just another guy with an opinion.
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Re: Sealing up engine for vacuum pump?
[Re: Adrielp]
#2494693
05/11/18 10:53 AM
05/11/18 10:53 AM
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Joined: Jun 2008
Posts: 577 Arkansas
Adrielp
OP
mopar
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OP
mopar
Joined: Jun 2008
Posts: 577
Arkansas
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Biggest leak we found was at the valley pan corners. We will re-seal that, let the silicone cure and check for leaks again to make sure we have no issues.
Adriel Paradise Substation Design Engineer III
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Re: Sealing up engine for vacuum pump?
[Re: Adrielp]
#2497899
05/19/18 04:17 PM
05/19/18 04:17 PM
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Joined: Feb 2003
Posts: 16,163 Mesa, Arizona
dart4forte
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 16,163
Mesa, Arizona
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Hi guys, we are getting our bracket car back out after sitting for a few years since my dads passing. We installed a vacuum pump(moroso 22640) on the engine and have discovered that the pump works and is pulling vacuum but it appears the engine is not sealed up as well as it should be for pulling vacuum. My question is where are the typical problem areas that you guys have run into where BBM's struggle to seal most. We want address these issues so we can get the engine sealed up. We plan to pressurize the crankcase and check for leaks but haven't quite gotten that done yet. Any help is appreciated. Thanks Are you running with mufflers?
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: Sealing up engine for vacuum pump?
[Re: Adrielp]
#2497933
05/19/18 06:17 PM
05/19/18 06:17 PM
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Joined: Oct 2007
Posts: 4,213 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,213
New York
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They're made to seal under pressure one way only 40 years ago, Bill Jenkins put the rear main seal in his pro stock SBC engines backward for that reason.
Boffin Emeritus
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Re: Sealing up engine for vacuum pump?
[Re: Adrielp]
#2498094
05/20/18 01:29 AM
05/20/18 01:29 AM
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Joined: Feb 2004
Posts: 34,958 S.E. South Dakota !
bigdad
Still Posting A Lot
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Still Posting A Lot
Joined: Feb 2004
Posts: 34,958
S.E. South Dakota !
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I know a little about running a pump but , not going to bother posting cause I hate to argue
The lips of fools bring them strife, and their mouths invite a beating.Proverbs 18:6
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