OH NO HO NO oil pressure

[kimcrwbr1]

I was just laughing at myself I rebuilt the motor in my riding mower got it running thinking break in period. It was running real good until it made that noise like it started struggling. I pulled the dipstick at the moment I looked at it I remembered I had not added oil. One of those OH MANNN moments we all have had.

 

[carcraft302]

oil pressure

Right now, as things look it may be better to tear it down! The engine still starts etc and I may limit damage and cost for parts, ie, crank shaft my still be usable, block etc. Good blocks are not hard to find, heads may still be Ok. I think I may be looking at rings, valves, cam, bearings lifters and rockers and a whole lot of expensive time consuming experiance. If it is still usable I will know that but a lack of knowledge can be expensive. How do you avoid mistakes? Experiance! How do you get experiance? By making mistakes!

 

[kimcrwbr1]

My 2.8 has been run without oil a few times for how long I have no idea but it still runs fine I would check the compression if it nice and even and you didnt run it at high rpm`s you may be alright.

 

[carcraft302]

oil pressure

But I want to run at high RPMS!

 

[v-8power]

I cant imagine the engine running for 20 mins. with no oil pressure. I think it would of spun a bearing by then. You could just pull off a rod cap and main cap to check for damage. Also the upper end noise would of sounded like a diesel rig if you had no oil pressure. IMO

 

[carcraft302]

oil pressure

That is what I would have thought. That is why I can't quit figure it out. At the end of the twenty minuet run I ran it up to 5,000 RPM. I was told the lifters would rattle a little at first until oil pressure came up (very brief period). Why would the remote oil filter be dry after I primed it. The remote oil filter hangs down and should have been full of oil.Why did I not pump oil to the remote oil filter site after I took the filter off the remote locator to see if it was getting oil. When I checked the remote lines they were dry. The oil I drained from the Engine did not seem like it had circulated. I was really hoping someone would say OH well that is how it should be all is well because I was a little depressed last night when I first posted. I really know all is not well and there is an oil problem.

 

[RangerSVT]

For future reference, always, ALWAYS, prior to running a new motor, prime the engine by spinning the oil pump with a drill (counterclockwise) and with a mechanical oil pressure gauge, make sure you have pressure, if you don't, there is no need to start the motor and cause damage...If could be a faulty pump, air leak between pickup tube and pump, etc
SVT

 

[carcraft302]

oil pressure

I did indeed prime the engine using an old distributor with out the gear! Did the 1/4 turn 2 minuet routine. I should have used an oil pressure gauge. I think you may have solved my problem and answered some questions! Just before I turned the Engine off after running it up to 5,000 rpm I thought I saw a squirt of oil come over the fender. I have a floater in my eye and the power steering pump was a little to full so I thought maybe it was the floater or the Power steering pump. If the O ring between the engine ond oil adapter failed and leaked could that explain the dry oil filter, dry remote lines , failed oil pressure and a good sounding engine? God may have blessed me here and you may have saved me a LOT of work!

 

[RangerSVT]

Let us know what you find
SVT

 

[gsp]

If the O ring between the engine ond oil adapter failed and leaked could that explain the dry oil filter, dry remote lines , failed oil pressure and a good sounding engine?

Sorry man, but no way,,, you would have oil everywhere, in the lines, filter and all over the ground in less than 5 seconds of a running motor.

 

[Explore]

My money is on the filter adapter. There is an in and out to them if I remember correctly. Check that, mechanical gauge and prime with drill to check pressure. 20 minutes of high rpm's and you would have known if something was drastically wrong. Wouldn't start it till you get oil pressure, but I wouldn't tear it down quite yet.

 

[fordtrucknut77]

ok yea if you turned it up to 5 grand with no oil pressure it would definetly have atleast spun a bearing.... is it possible you just plain have a bad oil pressure gauge?

 

[carcraft302]

oil pressure

Well some hopefully good news! I talked to the folks that built my engine. They said no way would it run for 20 min with zero oil pressure, it would have seized. I did a little reading and found out about a trickey little item called the oil pressure bypass valve. It seems oil pumps generate to much pressure some times so there is a valve that blows off the excessive pressure and dumps the oil into the timing chain cover to drain back into the oil pan. This valve reduces pressure and can allow oil to bypass the oil filter. I am wondering if mine is stuck and how to "unstuck it". The folks at the rebuild shop suggested the old drill to oil pump with a mechanical or direct pressure read oil pressure gage. That will be on my agenda shortly. More to follow!

 

[gsp]

Status??????

 

[fordmike1]

Well some hopefully good news! I talked to the folks that built my engine. They said no way would it run for 20 min with zero oil pressure, it would have seized. I did a little reading and found out about a trickey little item called the oil pressure bypass valve. It seems oil pumps generate to much pressure some times so there is a valve that blows off the excessive pressure and dumps the oil into the timing chain cover to drain back into the oil pan. This valve reduces pressure and can allow oil to bypass the oil filter. I am wondering if mine is stuck and how to "unstuck it". The folks at the rebuild shop suggested the old drill to oil pump with a mechanical or direct pressure read oil pressure gage. That will be on my agenda shortly. More to follow!

The oil pressure valve is located inside the oil pump and it bleeds off pressure internally inside the oil pump. The oil gets pumped right from the pump and then it goes straight into the oil filter and there is no other way for it to go but to the filter first. Sounds like the engine builder was blowing smoke where the sun dont shine!!! I have seen new engines run and drive down the road with no oil flow and still be ok and thats becuse the assembly lube that was used protected the engine from major damage. We had a guy bring us his chevy truck with a 350 becuse he couldnt figure out why it didnt show oil pressure on his gauge in the dash. Well he didnt put in the oil pump drive and he drove the truck in to us. If I didnt see for myself I wouldnt have belived it. Any ways take this advise for what its worth and tare down the engine and find out why you had a dry oil filter as some thing is very wrong!!!