The Ford Barn

FLoldcarlover · 04-27-2014, 10:13 PM

Would a broken Pressure relief spring cause High oil pressure readings and a knocking sound?

flatjack9 · 04-27-2014, 10:32 PM

Never seen a broken spring. And if it was broken, it wouldn't cause a knock. Need more of a description.

G.M. · 04-27-2014, 11:25 PM

A weak spring lowers the pressure, a broken spring should be real low.
Use a mechanical gauge to check the pressure. How high is it?? I'm thinking real low pressure and a bad gauge. G.M.

ford3 · 04-27-2014, 11:54 PM

a couple of things come to mind, a bad gage or a stuck relief valve in pump, but as far as i know neither will cause a knocking sound, is it a sharp knock or a deep knock?

dumb person · 04-28-2014, 12:12 AM

Blocked oil gallery?

jerry shook · 04-28-2014, 06:48 AM

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My 40 uses a lot of oil don"t smoke and some time there is a drop or two of oil when parked. My oil gage goes over 50 when driving and drops a little at idle. What should the average pressure be.

TonyM · 04-28-2014, 07:58 AM

I also have erratic oil pressure reads. But you can't even hear my car running. It is quiet. Nothing leaks out of my car. The car runs at about 170 degrees and does not get hot under normal circumstances. What should the pressure be and how should the gauge act?

scooder · 04-28-2014, 08:18 AM

Did the pressure guage suddunly go realy high at the same time the knock started?
Martin.

Quote:

Originally Posted by TonyM

I also have erratic oil pressure reads. But you can't even hear my car running. It is quiet. Nothing leaks out of my car. The car runs at about 170 degrees and does not get hot under normal circumstances. What should the pressure be and how should the gauge act?

30lb -50lb fairly normal when up at 50-60mph. Dropping to almost nothing at idle is quite common, they seem to not mind this. And can go on for years like it.
If its the stock electric guage, these can be far from acurate. Capiliary type are better.
There was an old rule of thum, 30lb at 30mph is fine.
I replaced the doings inside the oil guage on the truck, and fitted the guts of a capilary type inside. Looks the same as it did before, but it gives belivable pressure.
Martin.

rotorwrench · 04-28-2014, 12:29 PM

If it spun a bearing on the crankshaft, it might have higher than normal readings until the bearing melts to pieces anyway.

04-27-2014, 10:13 PM	#1
FLoldcarlover Junior Member Join Date: May 2010 Location: Spring Hill, FL Posts: 6	Extremmly High Oil pressure in a 1952 Ford Flathead all of a sudden? Would a broken Pressure relief spring cause High oil pressure readings and a knocking sound?

04-27-2014, 10:32 PM	#2
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,526	Re: Extremmly High Oil pressure in a 1952 Ford Flathead all of a sudden? Never seen a broken spring. And if it was broken, it wouldn't cause a knock. Need more of a description.

04-27-2014, 11:25 PM	#3
G.M. Senior Member Join Date: May 2010 Location: Florida and Penna. Posts: 4,471	Re: Extremmly High Oil pressure in a 1952 Ford Flathead all of a sudden? A weak spring lowers the pressure, a broken spring should be real low. Use a mechanical gauge to check the pressure. How high is it?? I'm thinking real low pressure and a bad gauge. G.M. __________________ www.fordcollector.com

04-27-2014, 11:54 PM	#4
ford3 Senior Member Join Date: Oct 2012 Location: oroville calif. Posts: 1,453	Re: Extremmly High Oil pressure in a 1952 Ford Flathead all of a sudden? a couple of things come to mind, a bad gage or a stuck relief valve in pump, but as far as i know neither will cause a knocking sound, is it a sharp knock or a deep knock?

04-28-2014, 12:12 AM	#5
dumb person Senior Member Join Date: Apr 2011 Location: South pacific island Posts: 1,724	Re: Extremmly High Oil pressure in a 1952 Ford Flathead all of a sudden? Blocked oil gallery? __________________ <Link> This is how we roll<Link> "I'm Convinced that no one really reads posts anymore; they just fabricate what they think the post says then ramble on about red herrings."--Bob Outcasts rules of old cars #1 Fun is imperative, mainstream is overrated #2 If they think it is impossible, prove them wrong #3 If the science says it impossible you are not being creative enough. #4 No shame in recreating something you never had #5 If it were not for the law & physics you would be unstoppable

04-28-2014, 06:48 AM	#6
jerry shook Senior Member Join Date: Nov 2010 Posts: 516	Re: Extremmly High Oil pressure in a 1952 Ford Flathead all of a sudden? Sponsored Links (Register now to hide all advertisements) My 40 uses a lot of oil don"t smoke and some time there is a drop or two of oil when parked. My oil gage goes over 50 when driving and drops a little at idle. What should the average pressure be.

04-28-2014, 07:58 AM	#7
TonyM Senior Member Join Date: Jun 2010 Location: West Hammond, Illinois Posts: 2,793	Re: Extremmly High Oil pressure in a 1952 Ford Flathead all of a sudden? I also have erratic oil pressure reads. But you can't even hear my car running. It is quiet. Nothing leaks out of my car. The car runs at about 170 degrees and does not get hot under normal circumstances. What should the pressure be and how should the gauge act?

04-28-2014, 12:29 PM	#9
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,431	Re: Extremmly High Oil pressure in a 1952 Ford Flathead all of a sudden? If it spun a bearing on the crankshaft, it might have higher than normal readings until the bearing melts to pieces anyway.