98V70 NA low oil pressure follow up

[erikv11]

As stated in the post, the metal pieces are about 1/4 inch thick. Much, much too thick to come from an oil filter.

OP did you take a look straight up when you got the filter off, at the block surface where the oil filter attaches - is the collar and everything still intact there?

I agree with wizchatmgr that there are almost certainly more goodies waiting for you in the pan. But you may not wish to bother with the detective work (I would, if I was willing put in another engine).

It will be interesting to hear the flood of speculations about what went wrong but in all likelihood: it's dead, Jim.

[wizechatmgr]

I'm completely speculating but perhaps the bottom of a connecting rod where she connects to the crankshaft? That would give you some "evil" noises that would make your skin crawl.

If it is a connecting rod that bit the big one, you may possibly be able to check by removing all spark plugs, disabling fuel pump and turn her over and see if the pistons all move upwards & downwards to their full extents. If you get one that doesn't, usually that will be the culprit.

You may have been able to put a valve through a piston - though I don't remember hearing of anyone doing it with Volvo's car engines off the top of my head. I've seen diesel trucks drop a valve and chew a hole right through the piston.

[erikv11]

Connecting rod base is a good bet, that's a smart test. He's got a misfire code too, was it #1?

[98v70dad]

As stated in the post, the metal pieces are about 1/4 inch thick. Much, much too thick to come from an oil filter.

OP did you take a look straight up when you got the filter off, at the block surface where the oil filter attaches - is the collar and everything still intact there?

I agree with wizchatmgr that there are almost certainly more goodies waiting for you in the pan. But you may not wish to bother with the detective work (I would, if I was willing put in another engine).

It will be interesting to hear the flood of speculations about what went wrong but in all likelihood: it's dead, Jim.

Pieces are 0.125 thick = 1/8th inch not 0.25 = 1/4 inch thick. The block mating surface seems fine. No sharp edges - nothing unusual. My point = which nobody has commented on is big chunks like that can't get past the sump screen. It would be very helpful to know which way the oil flows. How did big chunks like that get stuck in the filter if they can't get past the sump screen? I honestly dont know. Knowledge is power.

[98v70dad]

Connecting rod base is a good bet, that's a smart test. He's got a misfire code too, was it #1?

Yes. Misfire on #1.

[wizechatmgr]

Pieces are 0.125 thick = 1/8th inch not 0.25 = 1/4 inch thick. The block mating surface seems fine. No sharp edges - nothing unusual. My point = which nobody has commented on is big chunks like that can't get past the sump screen. It would be very helpful to know which way the oil flows. How did big chunks like that get stuck in the filter if they can't get past the sump screen? I honestly dont know. Knowledge is power.

The majority of car's I've owned:
Oil goes from sump through strainer and gets sucked up by oil pump pickup (usually all one assembly)
Oil pump sends oil to/through oil filter
Filtered oil goes to all the oil passages (assumes proper volume and pressure of oil)

I haven't seen the strainer on my Volvo but I know my old VW would allow up to about 1/8" diameter objects to be sucked up. I'd imagine the Volvo is at least that fine of a strainer, possibly better.

[RickHaleParker]

"It would be very helpful to know which way the oil flows."

In the filter, oil flows from the outside diameter to the center.

[theWIFES_S70]

So, the MVS consensus is that some part of a rod has broken loose? And that would fall into the oil filter, how exactly? Would it rip through the screen and into the oil filter?

It seems like we need pictures of Volvo rods... Here's one I found online. All these things are made of different kinds of metals, no? (That's Blackstone does oil analyses, right?)



So is this a manufacturing defect in the rod?

Or a question of collapsed oil pickup seals?

Has there been a catastrophic oil pickup seal occurrence like this before? I've only been on here for a few years and I have never heard of anything like this...

Really, feel for you 98v70dad

[cn90]

I am no oil pressure guru, but I have gathered some info, which I think is useful to understand.

1. Oil Pump sucks oil from the pick-up screen, then pumps it downward through the OUTER aspect of the Oil Filter (Red Arrow).
- Then oil is filtered and exits the Oil Filter at the very center (GREEN Arrow), feeding the crank, cam etc.
- Excess oil is bled via Relief Valve (YELLOW Arrow).

Oil-01.jpg (191.62 KiB) Viewed 1118 times

2. Another pic:

Oil-02.jpg (97.28 KiB) Viewed 1118 times

3. How Oil Pump works, this guy did a very good job explaining how a Toyota Oil Pump works:


[youtube][/youtube]



To summarize it, the only way for you to have metals at that location just above the Oil Filter: they have to come from the Oil Pump itself, which I find hard to believe b/c these oil pumps last the life of the car. Unless abused by P.O. by extended oil change intervals with sludge etc.

To open the Oil Pump to inspect is not that hard, tons of youtube videos:
- Undo the crank pulley
- Once the Timing Belt is off, remove the Crank Seal, then follow instructions to remove the oil pump.

At this time, it is all academic, if you have the stamina and academia, go for it, pulling the Oil Pump etc. to satisfy this crowd's curiosity. If not ---> junk yard, then "new" 100K car LOL.

[wizechatmgr]

Do those pieces/fragments respond to a magnet? (Ferrous)