rumplecat

I changed oil and fuel filters on the 5 ton, fuel filters were in terrible shape, especially the secondary ones(hard to reach to change). Oil filters looked pretty good, I let the truck sit for about two weeks to drain the filters. Only had to add a quart or so of oil. Issue is prior to filter change idle oil pressure was about 30-35lbs now after running the engine for about 20 minutes it is steady at 60-65lbs at idle and 85lbs at 2000rpms. Will this settle back to 30lbs. or is this where it should be????
Thanks,
James G.

Attached Images

	fuel_filter_condr_538.jpg (157.6 KB, 704 views)

__________________
KTALGSTO

M543A2, M813A1, M818, M813WW, M35A2, M35A2WW x 2, M35, Burma Jeep GTBC '43, M416 X 3, WC 52, M715 x 4, M724, 6217, M37 x 4, M1008,Pioneer Tool Trailers x 2, Light Tower Trailer, M101 x 5, M116 x 2, M101A2 x 3 M105 x 12, M1061E1, M796 X 2, M127A2C X 2, M448, M332, M128A1, M198, 1947 Dodge Power Wagon

red devils dude

if the 5ton has a LDS motor it could be the filter was so dirty the oil couldn't flow though it now it's clean
and it's flowing correctly pressure goes up.

__________________
M35A2 and anything in the motorpool
11B Bco 1-502INF 101st ABN

jwaller

ya. ditto. you could have been bypassing the filter due to it being clogged hence the low pressure. I have about the same as you now on idle oil pressure. mine has 60-65 at all times. although this is definatly not normal. I like it being high but from what I have gathered from reading on here most ppl report much lower oil press at idle. I think somebody has replaced the bypass spring in my pump at one time or another and I am glad they did.

__________________
M998 W/W
XM818 W/W
M35A2 W/W .69 OD GEARS
M270A1

Waller performance owner/builder
http://www.wallerperformance.com

rumplecat

My engine is the LDS 4651A, when I got it back at the first of the year, it had been completely drained of all fluids, so the oil is new and now all the filters are new but the change in oil pressure worries me. 65lbs seems really high for the engine to have at idle! Nothing else has changed except the filters, and I don't see how I could have screwed up the installation? If you install a mechanical oil gage where is the best location to tie into the oil system?
James G.

__________________
KTALGSTO

M543A2, M813A1, M818, M813WW, M35A2, M35A2WW x 2, M35, Burma Jeep GTBC '43, M416 X 3, WC 52, M715 x 4, M724, 6217, M37 x 4, M1008,Pioneer Tool Trailers x 2, Light Tower Trailer, M101 x 5, M116 x 2, M101A2 x 3 M105 x 12, M1061E1, M796 X 2, M127A2C X 2, M448, M332, M128A1, M198, 1947 Dodge Power Wagon

cranetruck

The temperature of the oil effects the viscosity and oil pressure. Cold oil will give you a higher pressure.
Mine normally starts out at 40 psi and drops to 20-25 after the engine temp is increased to about 150°F (at idle and with 30W oil).

What grade oil are you using?

__________________
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"

cranetruck

[quote="rumplecat"].... If you install a mechanical oil gage where is the best location to tie into the oil system?
quote]

Same place as where the sending unit is installed. Use a Tee or one or the other.

__________________
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"

red devils dude

James the LDT in my deuce has 85lbs of oil at idle so you should be fine.

__________________
M35A2 and anything in the motorpool
11B Bco 1-502INF 101st ABN

rumplecat

Jed has it always run that pressure? What do you run at 2000rpm? Bjorn I am running Rotella T 15W-40 and the engine was at about 120 degrees when it was showing 65lbs. at idle. Now that some of my fears of damaging the engine have been alayed I will let it run up to running temp. and see what the pressure is.
James G.

__________________
KTALGSTO

M543A2, M813A1, M818, M813WW, M35A2, M35A2WW x 2, M35, Burma Jeep GTBC '43, M416 X 3, WC 52, M715 x 4, M724, 6217, M37 x 4, M1008,Pioneer Tool Trailers x 2, Light Tower Trailer, M101 x 5, M116 x 2, M101A2 x 3 M105 x 12, M1061E1, M796 X 2, M127A2C X 2, M448, M332, M128A1, M198, 1947 Dodge Power Wagon

rumplecat

I fired up the M543A2 today after running about 30 minutes the oil pressure dropped down to about 50 at 170 degrees and would run up to 70lbs around 2000 rpm. I am taking it over to an insurance office for an inspection and photos Friday, about a 6-8 mile trip, we will see how the pressure holds.
Thanks for all the help.
James G.

__________________
KTALGSTO

M543A2, M813A1, M818, M813WW, M35A2, M35A2WW x 2, M35, Burma Jeep GTBC '43, M416 X 3, WC 52, M715 x 4, M724, 6217, M37 x 4, M1008,Pioneer Tool Trailers x 2, Light Tower Trailer, M101 x 5, M116 x 2, M101A2 x 3 M105 x 12, M1061E1, M796 X 2, M127A2C X 2, M448, M332, M128A1, M198, 1947 Dodge Power Wagon

cranetruck

James, checking the LDS465-1A specs, it calls for 50-65 psi at normal operating temp and 2,800 rpm.

__________________
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"