Ok, this has me stumped....

[Captkaos]

Friday I started diagnosing something that happened about a Month ago on the Jimmy that make me push it back in the garage. It swelled the oil filter off the truck and spewed out 3 quarts of oil. I typically crank it every week to make sure it still runs and I was going to pull it out and actually finish putting the interior in. It moved 10 feet and when I parked it, oil was running out the garage, all of 3 quarts worth.

Friday night I pulled the filter and discovered it was swollen out and the seal was blown out. Thinking simple solution, I put a new filter on and after looking things over I put in the oil spun it over a couple time while my brother was watching the underside and once I felt comfortable I cranked it. Not 5 seconds after I released the key oil starts blowing everywhere. Upon second investigation, we have another swelled oil filter and about a quart of oil all over the place. Upon this adventure I pull valve cover to see if any oil is up there, there is, but.... So, I pull the oil pressure switch and the distributor put another filter on there and run the pump with a prime tool. A geyser of oil spews out of the oil pressure tap, so I put it back in. Oil is getting to at least the top of the motor before getting to the oil passages for the main and cam feeds. So, I call it a night.

Sunday: Pull the oil filter off, (apparently still under pressure since I twisted it on my hand and can't get it off now. Drop the previously fabricated crappy Y pipe, pull the pan and drop the oil pump and pan. Crap in all in the bottom of the oil pan. Keeping in mind this motor probably has less than 1000 miles since I rebuilt it, it appears to have over 100,000 miles on it. I pull the pump apart and everything looks ok. So, anyone got any diagnosis on this thing before I have to yank it out. This seriously has me stumped.

[Jonboy]

I think there is a bypass in the oil filter adapter as well. Since you have the oil filter off, the adapter should be held on with 2 more bolts. Could be possible it has some of what was in the pan lodged in there?

[Captkaos]

Already checked those. Bypass valve wouldn't have let pressure to the top of the motor and it is ok. Check valve in the pump looked ok, but.... Based on the crud in the pan, I am thinking some passage is stopped up, or a main or cam bearing is spun, but still doesn't make sense to me.

[SanitysBane]

my bypass valve is closed off permiantly, thats only for if the filter gets pluged up, and has to much presure drop across it, that is defiently odd, posibly getting cylinder pressure into the oil via a messed up gasket somewere? or worse, oh and by the way, its never a good thing to just run a motor for 10 minutes and then shut it off, and just go about doing so for any period of time, only running it 10 minutes doesn't get the oil exparated out of the oil, u need to run it for atleast 30 minutes and make shure that it is nice and warmed up, remember when u burn 1 gallon of gas u make like 5 or so gallons of water

edit"plus lets not forget that piston walls, and wrist pins are getting splashed lubricated, as well as some other parts, so you don't want to run it at an idle, get it up in the 1500-2000 rpm range

[Captkaos]

Originally Posted by SanitysBane

my bypass valve is closed off permiantly....... so you don't want to run it at an idle, get it up in the 1500-2000 rpm range....

I was at work and real busy, so I didn't expand on the crank it issue. It is cranked and driven around the block to make sure everything is ok: Water leaks, oil leaks, brakes operation etc, etc.... The day this happened I was going on our typical journey, pull the truck out, parked the truck got out to let the garage door down and when I open the Jimmy door oil was EVERYWHERE, so I got under it to see what happened.

I have NEVER seen one blow off where the bypass worked on. Just my personal preference, but I would never block off the bypass valve. I would rather have unfilter oil than oil all over the ground that never made it to the rest of the motor.

[SanitysBane]

well after our 2nd crank shaft went by-by in 1 block we decided that all oil needs to filtered, and i am talking about big blocks and small blocks, i don't know any thing about them, but on the 468 on the engine stand at the moment, its filter got plugged up and caused a lose of oil presure BUT the filter never expanded or anything at all.

[Toolboy23]

Does it happen at idle, also have you noticed if the oil pressure gauge was pegged? I had that happen on a vega (140ci) back years ago, but it had an adjustable regulator in the oil pump. Never heard of it on a small block.(or big)

[Captkaos]

Originally Posted by SanitysBane

well after our 2nd crank shaft went by-by in 1 block we decided that all oil needs to filtered, and i am talking about big blocks and small blocks, i don't know any thing about them, but on the 468 on the engine stand at the moment, its filter got plugged up and caused a lose of oil presure BUT the filter never expanded or anything at all.

Yeah, I normally only play with BBC's. Never had a filter clog though, but I can see your reasoning. I was just speaking of personal option. I have seen losing pressure from a clogged filter since that is what should happen in my opinion.

[Captkaos]

Originally Posted by Toolboy23

Does it happen at idle, also have you noticed if the oil pressure gauge was pegged?

Yes, at idle. Once the key is moved to the start position and I let off to the run position, it blew. So it is happening IMMEDIATELY. This is where the confusion comes in. It SHOULD bypass the filter, not swell it. It only has idiot lights on it

[SanitysBane]

might get an el cheapo mech gague at wallmart, thats what i use and it seems to be really acurate, just disconect the coil and spin it over to see what PSI your getting

[Toolboy23]

If its blown two filters now, it almost has to be a restriction in the block immediatly after the filter. Even if a main or cam bearing had spun, I cant really see it causing that. I think it would just get more oil at the other bearings. That is very strange.

[Tom]

Its a blockage in the oil passages IMO. Time to tear it apart and do a very good clean job including the rifle brushes.

[Captkaos]

Originally Posted by SanitysBane

might get an el cheapo mech gague at wallmart, thats what i use and it seems to be really acurate, just disconect the coil and spin it over to see what PSI your getting

I have a gauge that I can put on it, problem is by the time I get it spun over to build pressure, the filter blows. In addition, I already know it is getting some type of pressure since it geysered out the top. Plus, the pan and pump is on the ground already

Originally Posted by Toolboy23

If its blown two filters now, it almost has to be a restriction in the block immediatly after the filter. Even if a main or cam bearing had spun, I cant really see it causing that. I think it would just get more oil at the other bearings. That is very strange.

Yeah, that is the conclusion I have already came to, but the restriction would have to be somewhere past the top of the block and before the cam/main passages since I am getting oil to the sender, which is another reason why putting a gauge on it wouldn't tell me anything. I was going to pull a valve cover and crank it, but we pulled the pan instead. Mainly because I didn't want to crank it without oil going anywhere. Remember it only has 1000 miles. I was just hoping for some new insight since it will be next weekend at the earliest before I can pull it.

Originally Posted by Tom

Its a blockage in the oil passages IMO. Time to tear it apart and do a very good clean job including the rifle brushes.

Yeah, those were my thoughts to, hence why I am so close to pulling it out. BTW, you should know that I already cleaned it out before we put it together, which is adding to the confusion.