Hi all name is Mike. I just bought a 1970 dodge d100 and found this site through sweptline.org. Glad to see this site as it has helped me get my truck running better. Ok now the problem I just started having is when I get up to 50-55 mph the oil pressure drops below the quarter line on the guage, don't know how much lower it will go I didn't go any faster. If I let up on the gas it goes back up to over half where it normally runs. Anyone konw what the problem might be or at least where I should start? Thanks for your time.

I would put a real pressure gauge in it and see what numbers its reading,mark

Definitely put a real gauge in the line but the first place I would look is the oil pressure relief valve on the oil pump. Sludge and debris can make its operation sluggish and erratic.

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David Kight
'62 Valiant Signet, White
'98 Dodge Dakota
'06 Jeep Liberty

Growing older is unavoidable but growing up is strictly optional.

If this is true pressure behavior, it sounds like a plugged oil pick-up screen or dirty oil filter.
DD

I would have to agree here, or you might be a quart or 2 low. If oil's full then the above might be the case. If there's room in the crankcase, add a quart of Tranny fluid and drive it for about 100 miles and do a oil change and see what the results are.

ok so i went out and warmed my truck up to see what was going on cause last night she took forever to start. She warmed up fine no problems. I got in and hit the gas acouple of time and the oil pressure shot down low again but this time the temp gauge shot down too. I start thinking my gauges are just jacked but when I look under the hood the hose from the radiator to the block looks like a blown up balloon. Ok so I just bought this truck and have never really worked on anything but a vw before so I have no clue. Help please!

I pulled the oil pan and took the screen off to clean it out. there was a bunch of splinterd hard plastic inside. I was thinking some kind of washer to hold the screen in????

im thinking broken umbrella valve seals, that and oil sludge flushing off the interior of the engine plugged up my pick up less than a month after i bought it

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1975 Plymouth Duster,225/6 2bbl. and duels, 904, 7 1/4
1986 Dodge Charger Shelby, 2.2 Turbo I, A525

well its been a little over a month since i bought mine. so just pop the valve cover and i should be able to se them??? thanks for your help. trying to figure this all out on my own is a pain. my friends look at this engine and don't want to touch it.

Could be the plastic teeth from the timing gear

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Also could be teeth off of a dist. gear.
Frank

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Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

Clean the plastic crumbs. Are they...black? Yellow? Light brown? Dark brown?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

light brown, almost orange

Okeh, that'll be camshaft sprocket tooth chunks and/or bits of distributor drive pinion. Pull the distributor and verify the drive pinion's in one piece and still has all its teeth…then get set to put in a new timing chain and sprocket set.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

so the timing sprockets are made of plastic not metal?? or do you meen if the distibutor is jacked it jacked up the timing sprockets and chain? and if i have to do all this is there a link somone knows of to help me do this. sorry kinda new trying to learn. Thanks for your help