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| Re: [GMCnet] Strange Oil Pressure Drop [message #271961 is a reply to message #271940] |
Sat, 14 February 2015 08:40   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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I just had a call from the lurker with the oil pressure problem. He
reports that after changing the filter the pressure seems to be back up.
He's warmed the engine thoroughly in the shop, but not yet taken it on the
road because of the outside temperature; he'll do that when it warms up --
possibly a few days from not -- and report again.
To answer a few of the earlier questions:
1. The heads were changed merely because of leaky valves in one cylinder;
he installed a set of heads I provided from my local engine builder; there
was no other engine problem.
2. The oil was not contaminated before the head swap, and I'd be VERY
surprised if he introduced any debris during the change. Especially since
the engine had been apart before and therefore probably had no turkey tray
to accumulate charred oil. The water was drained well before the heads
were removed. The oil was replaced after the repair simply out of an
abundance of caution.
3. The before and after filters (Wix?) were nominally identical.
4. He still runs the OEM oil pressure gauge with a fairly new sender, as
well as a high quality aftermarket gauge. The gauges both respond
similarly.
He sends his appreciation for all the thoughtful consideration of the
problem and helpful comments.
We'll let you know the hot engine run results later.
Ken H.
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Strange Oil Pressure Drop [message #271982 is a reply to message #271871] |
Sat, 14 February 2015 13:57 |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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Senior Member |
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OK !! Nothing serious!! Glad things worked out.
Now can he please help us out?
Please could he take apart the filter and identify why it was the cause. It would sure help with the knowledge base.
AND I'm real curious now.
Best regards
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
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| Re: [GMCnet] Strange Oil Pressure Drop [message #271983 is a reply to message #271940] |
Sat, 14 February 2015 14:02 |
bwevers
Messages: 597
Registered: October 2010
Location: San Jose
Karma: 5
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Senior Member |
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Rob,
That Wix filter has an impressive 273 sq inches of filter area.
It must take a lot of dirt to restrict the flow!
-Bill
Bill Wevers GMC49ers, GMC Western States
1975 Glenbrook - Manny Powerdrive, OneTon
455 F Block, G heads
San Jose
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| Re: [GMCnet] Strange Oil Pressure Drop [message #271987 is a reply to message #271961] |
Sat, 14 February 2015 14:35 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ken,
That's great news!
Tell him NOT to throw the filter away!!!!!!
I would suggest it be cut open and inspected to determine why it caused the drop in oil pressure.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Henderson
Sent: Sunday, February 15, 2015 1:41 AM
To: gmclist
Subject: Re: [GMCnet] Strange Oil Pressure Drop
I just had a call from the lurker with the oil pressure problem. He
reports that after changing the filter the pressure seems to be back up.
He's warmed the engine thoroughly in the shop, but not yet taken it on the
road because of the outside temperature; he'll do that when it warms up --
possibly a few days from not -- and report again.
To answer a few of the earlier questions:
1. The heads were changed merely because of leaky valves in one cylinder;
he installed a set of heads I provided from my local engine builder; there
was no other engine problem.
2. The oil was not contaminated before the head swap, and I'd be VERY
surprised if he introduced any debris during the change. Especially since
the engine had been apart before and therefore probably had no turkey tray
to accumulate charred oil. The water was drained well before the heads
were removed. The oil was replaced after the repair simply out of an
abundance of caution.
3. The before and after filters (Wix?) were nominally identical.
4. He still runs the OEM oil pressure gauge with a fairly new sender, as
well as a high quality aftermarket gauge. The gauges both respond
similarly.
He sends his appreciation for all the thoughtful consideration of the
problem and helpful comments.
We'll let you know the hot engine run results later.
Ken H.
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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