Another oil pressure problem
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Fleet Mechanic
Joined: Dec 2005
Posts: 1,603
Likes: 44
Another oil pressure problem
We bought another 1954 F900. I picked it up with my 54 F800 & trailer I told
my son hope you got ATM card. whew 3 tanks of gas that was a long ride.
anyways my son got it for $1500 a dump truck full air generally good shape
they said rebuilt motor in the mid 1990s. 6vt pos gr of course so we didnt
get it running and pushed it on the trailer. The F8 pulled it as if the backhoe
was on there so its it feels like about 13000lb. Any way first I changed it to
12vt (still pos grd) with an either way alternator. The gas stunk so hose &
elec fuel pump. Now the problem oil pressure is 100lb and 90lbs hot and this
is with mec gauge screw in there. Been around these things since they were
new. The big Lincolns usually had bad oil press. Details are I dont think the
engine is origional It has rams horns, teapot holley high mount fan . The 54
317 should have square manifolds with a cross over pipe. My thought is its
been updated to a 368 57 turnpike . Ok it runs fine It has a rotor type
oil pump (so thats later) I took the relief valve out, thats fine, spring fine,
very clean, spin on oil filter all specs where they should be. Still 100lbs I dont
dare to connect the dash gauge up cause it will get blown out of the dash.
I run it daily moving gravel around letting it run all day and it stays around
85 to 90lbs I built up moochu of these big Y blocks and never seen this
before. One good thing pulled valve cover off Hospitol clean and boy do I
have oil up there (which they usually starved) any thoughts!!!!!!!!!!!!!!
Sam
my son hope you got ATM card. whew 3 tanks of gas that was a long ride.
anyways my son got it for $1500 a dump truck full air generally good shape
they said rebuilt motor in the mid 1990s. 6vt pos gr of course so we didnt
get it running and pushed it on the trailer. The F8 pulled it as if the backhoe
was on there so its it feels like about 13000lb. Any way first I changed it to
12vt (still pos grd) with an either way alternator. The gas stunk so hose &
elec fuel pump. Now the problem oil pressure is 100lb and 90lbs hot and this
is with mec gauge screw in there. Been around these things since they were
new. The big Lincolns usually had bad oil press. Details are I dont think the
engine is origional It has rams horns, teapot holley high mount fan . The 54
317 should have square manifolds with a cross over pipe. My thought is its
been updated to a 368 57 turnpike . Ok it runs fine It has a rotor type
oil pump (so thats later) I took the relief valve out, thats fine, spring fine,
very clean, spin on oil filter all specs where they should be. Still 100lbs I dont
dare to connect the dash gauge up cause it will get blown out of the dash.
I run it daily moving gravel around letting it run all day and it stays around
85 to 90lbs I built up moochu of these big Y blocks and never seen this
before. One good thing pulled valve cover off Hospitol clean and boy do I
have oil up there (which they usually starved) any thoughts!!!!!!!!!!!!!!
Sam
Lead Driver
Joined: Apr 2002
Posts: 8,813
Likes: 13
From: Littleton, New Hampshire
A high volume oil pump will easily produce 100 pounds of oil pressure. My engine runs about 100 PSI when cold. I don't understand the 90 PSI when hot though. Even with a high volume oil pump it should drop off to about 40 or so at speed even less at idle. Just guessing but you may have some kind of blockage in the oil passages inside the engine...
