• When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

help! no oil pressure

it looked a little scored when I took oil pump apart. it does turn when I held it in my hand and used the int shaft to turn it.either way now that its off I will replace pump and go from there .will update in the future
 
strange that it happened right after
you stated a couple hard breaking stops (IIRC)

most all the previous recommended checks
'are viable'
my 1st suspect after that, was the pressure spring
on the side of the pump faulty/broken
or the pump (drive) shaft
or something in the oil pan (like sludge/grime etc.)
strange stuff happens sometimes, especially if it's never been off
you did service on the heads previously something got down there (?)
something in the pan "possibly" slid forward & clogged the pick up
or the pick up fell-off/broke (not as likely)

I'd pull the valve cover too, it can't hurt
check it out, it may just be a coincidence
it happened right after the hard breaking
bad lifter, bent pushrod, faulty or even broken rocker/s,
plug on the end of the rocker shaft came out
or rotted out etc. (not as likely)

loosing all the oil pressure,
sounds like an oil pump failure or something seriously clogged
(like the oil pressure sending unit too, as far as the gauge goes)
especially with the accompanied lifter/clacking noises you described
&/or clogged oil-filter bypass
check the easiest & most logical 1st
do an oil change & filter change,
look & see if it's got a lot of metallic in the oil
unfortunately it could be something far worse
(sorry; not trying to be a negative Nancy)

good luck
 
Last edited:
Bent a pushrod and a lifter popped out...By "hit the pedal pretty hard" I'm taking that to mean the accelerator pedal, not the brake.
 
If nothing has been done to the engine all these years, I'd pull the valve covers and check the valve train as suggested. Also check for valve seals. They dry rot, break apart and they get into the pan, clogging up the oil pickup.
 
khryslerkid said:
If nothing has been done to the engine all these years, I'd pull the valve covers and check the valve train as suggested. Also check for valve seals. They dry rot, break apart and they get into the pan, clogging up the oil pickup.
Click to expand...



I will install new oil pump next week. I was thinking maybe pickup in oil pan maybe clogged.if I have no pressure after I install pump and use primer tool I will take valve cover off.i am trying to eliminate component one by one so I don't end up with half engine apart. I will update next week thanks
 
Expect the primer can take a little while to fill an empty filter (less time if pre-filled) and build pressure. You'll feel it drag the drill down. You might want to attach a known good mechanical oil pressure gauge to the plugged send port.
After 36 years, brittle umbrella seal bits and gasket material may very well be part of the cause. Do you know what type of cam timing gear is in it? What has come out of the oil pan drain with the oil?
 
Polara426 said:
I also bet a lifter popped out seen it!!
Click to expand...

oil looked good when drained. just ordered new oil pump . hope to install next weekend.if no pressure I will remove oil pan and see if there are any surprises. I wonder if pickup in oil pan got clogged somehow
 
Check for debris in the pan. Broken pieces of valve seals can cause the pickup to clog if they slide during a hard braking.
 
WileERobby said:
Check for debris in the pan. Broken pieces of valve seals can cause the pickup to clog if they slide during a hard braking.
Click to expand...


update- installed new oil pump yesterday. primed engine first and oil came up real quick. put distributor in and started car. plenty oil pressure and no more engine noise.i guess some how old oil pump went bad.thanks
 
Richard Cranium said:
Did you take the pump apart to see what was going on inside?
Click to expand...


yes, I didn't see anything wrong.it was still spinning if I manually turned it.i am going to drop oil pan down the road since its never been off. there might be a lot of sludge that maybe clogged pickup.either way for now I have probably a little more pressure at idle and no engine noise.thanks
 
barryv said:
I took it apart today and just saw a spring which was fine.thanks
Click to expand...
There's piston/relief valve did that come out or was it stuck? If it stuck in the relief pressure position no or low oil pressure. Someone correct if I'm wrong.
 
Fran Blacker said:
There's piston/relief valve did that come out or was it stuck? If it stuck in the relief pressure position no or low oil pressure. Someone correct if I'm wrong.
Click to expand...

if we are talking about the spring.yes it came out easy in one piece.thanks
 
The spring pushes the relief plunger valve did that come out? See pic ,could have stuck open?
oilpz.JPG
 
You must log in or register to reply here.

Similar threads

Y
Oil pressure irregular
Replies
19
Views
914
gtxrt
gtxrt
clazar
Oil pressure scare
Replies
14
Views
2K
clazar
clazar
clazar
Oil pressure gauge issue
2
Replies
25
Views
2K
barryv
B
Dave6T4
Bummer! No oil Pressure
3 4 5
Replies
80
Views
5K
1963JAM
1963JAM
biomedtechguy
The 440 that was in my 70 V-code Roadrunner won't be down for breakfast...
2
Replies
39
Views
4K
biomedtechguy
biomedtechguy
Auto Transport Service
Back
Top