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Charles Heathco
Joined: 10 Jan 2006
Posts: 201
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 Posted: Mon Jun 29, 2009 5:19 am Post subject: Loss of vacum |
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Was flying along and noticed my AI was sitting cocked looked at vac and had none. Anything I could look at other than vac pump on the fritz? Last time I lost vac it ws in a cherokee in 1968. That time the vac instruments moved around, very confusing. This time nothing is moving at all. Anyone can say how to test pummp easily? (hate the thought of haveing to remove as that bottom nut is a bitch to get to) Charlie H
[quote][b]
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mrobert569(at)hotmail.com
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| Posted: Mon Jun 29, 2009 7:52 am Post subject: Loss of vacum |
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Charlie C
The only other thing to check is the inlet filter for the system. After that it is replace the pump and see.
Mike Robertson
Das Fed
From: cheathco(at)cox.net
To: rv-list(at)matronics.com
Subject: Loss of vacum
Date: Mon C 29 Jun 2009 08:16:42 -0500
Was flying along and noticed my AI was sitting cocked looked at vac and had none. Anything I could look at other than vac pump on the fritz? Last time I lost vac it ws in a cherokee in 1968. That time the vac instruments moved around C very confusing. This time nothing is moving at all. Anyone can say how to test pummp easily? (hate the thought of haveing to remove as that bottom nut is a bitch to get to) Charlie H
Hotmail® has ever-growing storage! Don’t worry about storage limits. Check it out. [quote][b]
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seiders(at)bellsouth.net
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| Posted: Mon Jun 29, 2009 8:53 am Post subject: Loss of vacum |
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You didn't say how many hrs on the pump. I don't believe in more than 300 to 500 then replace. They can fail anytime tho.
I'd check hoses first. If they are secure you need a new pump. It isn't likely your regulator turned itself off.
At 09:16 AM 6/29/2009, you wrote:
[quote]Was flying along and noticed my AI was sitting cocked looked at vac and had none. Anything I could look at other than vac pump on the fritz? Last time I lost vac it ws in a cherokee in 1968. That time the vac instruments moved around, very confusing. This time nothing is moving at all. Anyone can say how to test pummp easily? (hate the thought of haveing to remove as that bottom nut is a bitch to get to) Charlie H
[b]
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rv8tor(at)lazy8.net
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| Posted: Mon Jun 29, 2009 9:11 am Post subject: Loss of vacum |
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When my AI failed a few years ago it did exactly what you describe (in the clouds of course). My DG was still working, and my suction gage still showed in the green, so I knew it was the AI.
John
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Richard Seiders
Sent: Monday, June 29, 2009 10:46 AM
To: rv-list(at)matronics.com
Subject: Re: Loss of vacum
You didn't say how many hrs on the pump. I don't believe in more than 300 to 500 then replace. They can fail anytime tho.
I'd check hoses first. If they are secure you need a new pump. It isn't likely your regulator turned itself off.
At 09:16 AM 6/29/2009, you wrote:
Was flying along and noticed my AI was sitting cocked looked at vac and had none. Anything I could look at other than vac pump on the fritz? Last time I lost vac it ws in a cherokee in 1968. That time the vac instruments moved around, very confusing. This time nothing is moving at all. Anyone can say how to test pummp easily? (hate the thought of haveing to remove as that bottom nut is a bitch to get to) Charlie H | Quote: | | http://www.matronics.com/Navigator?RV-List |
0123456789
[quote][b]
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Mon Jun 29, 2009 9:52 am Post subject: Loss of vacum |
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It is worth borrowing or buying the Rapco wrench for vacuum pumps. Makes
the bottom nut not too difficult. It is not unusual for vacuum pumps to
get just enough engine oil, either from the garlock seal failing or just
from other leaks to introduce enough drag to cause the drive coupler to
shear. I don't recall whether it was Tempest brand or other than now
makes the drive coupler area protected from oil.
John Huft wrote:
| Quote: | When my AI failed a few years ago it did exactly what you describe (in
the clouds of course). My DG was still working, and my suction gage
still showed in the green, so I knew it was the AI.
John
*From:* owner-rv-list-server(at)matronics.com
[mailto:owner-rv-list-server(at)matronics.com] *On Behalf Of *Richard Seiders
*Sent:* Monday, June 29, 2009 10:46 AM
*To:* rv-list(at)matronics.com
*Subject:* Re: Loss of vacum
You didn't say how many hrs on the pump. I don't believe in more than
300 to 500 then replace. They can fail anytime tho.
I'd check hoses first. If they are secure you need a new pump. It isn't
likely your regulator turned itself off.
At 09:16 AM 6/29/2009, you wrote:
Was flying along and noticed my AI was sitting cocked looked at vac and
had none. Anything I could look at other than vac pump on the fritz?
Last time I lost vac it ws in a cherokee in 1968. That time the vac
instruments moved around, very confusing. This time nothing is moving at
all. Anyone can say how to test pummp easily? (hate the thought of
haveing to remove as that bottom nut is a bitch to get to) Charlie H
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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