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05-17-2009, 09:36
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#1 (permalink)
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Moderator
Join Date: Jan 2005
Location: Meadows of Dan, Virginia
Posts: 9,929
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A differential oil pressure gauge...
Installed the differential oil pressure on the 8x8, previously used on the deuce.
It displays the pressure drop across the oil filters and oil cooler. To my surprise, it indicated less than 1 (one) psi, I had expected about 5 or so based on the readings from the deuce. Now I'm wondering if the bypass valve is calibrated correctly or perhaps even disabled...
__________________
Bjorn
MEP-018A (needs new generator head)
Avatar: XM757 in OK prepared for 1,000 mile trip home. Part of 6,000 mile journey in 2006.
1968 M49A2C modified with 1960 M756A2 truck bed and 1975 HIAB 765A knuckleboom, exhaust brake and more. (SOLD)
1969 Ford XM757 8x8, 5-ton Pershing 1A truck tractor...the "improved MV".
"Some things can't be made better, just differently......a lot of things actually"
Last edited by cranetruck; 05-17-2009 at 10:31.
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05-17-2009, 09:57
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#2 (permalink)
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4 Star General
Join Date: Oct 2005
Location: Northern Minnesota
Posts: 1,179
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If I'm understanding this correctly it sounds you're truck is at one extreme and mine is at the other.
I blew the seals out of the gauge that reads between the pump and the filters last winter.
I too wonder if the valve"s" are calibrated. (scratching head)
__________________
Ernie (Sasquatch Santa) Mitchell
www.M35MonsterTruck.com
It ain't what you pay for 'em it's what you end up spending on 'em.
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05-19-2009, 18:28
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#3 (permalink)
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Moderator
Join Date: Jan 2005
Location: Meadows of Dan, Virginia
Posts: 9,929
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Having checked the bypass valve and replaced the filter elements, I have come to the conclusion that the less than 1 psi across the full flow filters is normal under the circumstances. The bypass filter keeps the oil "squeaky clean" and the full flow filters present little resistance.
Time and more driving will tell how long this condition will remain.
__________________
Bjorn
MEP-018A (needs new generator head)
Avatar: XM757 in OK prepared for 1,000 mile trip home. Part of 6,000 mile journey in 2006.
1968 M49A2C modified with 1960 M756A2 truck bed and 1975 HIAB 765A knuckleboom, exhaust brake and more. (SOLD)
1969 Ford XM757 8x8, 5-ton Pershing 1A truck tractor...the "improved MV".
"Some things can't be made better, just differently......a lot of things actually"
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