Uh oh? Part on drain plug magnet.

[richard booth]

No idea, that's weird. Is this a OHV 4.0 or a SOHC engine that we are talking about?

OHV.

 

[Uncle Gump]

Any ideas what the mystery part is @bobbywalter

 

[bobbywalter]

almost looks like a bypass seat for the oil psi...but not sure on a 4.0.

 

[superj]

The other thing is drive it and see if anything frags out

 

[19Walt93]

The little tab on the end would have held a spring in place so oil pressure relief valve might be a possibility. Is the pressure still good at idle? If it's from your 88, I think that might still have bimetal gauges. If it has the later magnetic gauges it will show about 2/3 of the scale if it sees any pressure at all and you'll need to connect a mechanical gauge to really know.
I've seen similar parts in automatic transmission valve bodies.

 

[rusty ol ranger]

The little tab on the end would have held a spring in place so oil pressure relief valve might be a possibility. Is the pressure still good at idle? If it's from your 88, I think that might still have bimetal gauges. If it has the later magnetic gauges it will show about 2/3 of the scale if it sees any pressure at all and you'll need to connect a mechanical gauge to really know.
I've seen similar parts in automatic transmission valve bodies.

Mid year 87 the actual reading went away

 

[Uncle Gump]

Isn't that too small to be an oil pressure relief? Not sure I've ever seen one that small. It also doesn't look to be round... I know I've never seen one that wasn't perfectly round that fit into a machined bore.

 

[bobbywalter]

Isn't that too small to be an oil pressure relief? Not sure I've ever seen one that small. It also doesn't look to be round... I know I've never seen one that wasn't perfectly round that fit into a machined bore.

cap side not piston seal. and i figure it was from before the rebuild....did not get cleaned out. dislodged at some point and here ya be...

 

[Josh B]

Looks to me like a fitting of a sort that went from a 1/4" to a smaller tube of some sort that you might find in a quik-lube kind of place or gadjit

 

[DRanger024]

I have a bare block and an oil pump from a 99 in my basement if you want to see anything in particular. I know it’s not much help but that’s all I have.

 

[richard booth]

The little tab on the end would have held a spring in place so oil pressure relief valve might be a possibility. Is the pressure still good at idle? If it's from your 88, I think that might still have bimetal gauges. If it has the later magnetic gauges it will show about 2/3 of the scale if it sees any pressure at all and you'll need to connect a mechanical gauge to really know.
I've seen similar parts in automatic transmission valve bodies.

Thanks for your time, the pressure is good at idle, 38lbs warm and over 50 running, I have a digital gauge as well as the stock one. This motor is from a 1991 explorer, I added the comp cams stage 2 cam and odessa heads, headers etc. It sounds and runs great but this is a stressor as it only has like 3500 miles.

 

[richard booth]

I have a bare block and an oil pump from a 99 in my basement if you want to see anything in particular. I know it’s not much help but that’s all I have.

Thanks, an old timing tensioner broken to show hinge part? Only thing I can figure at this point. Thanks!

 

[richard booth]

I screen filtered the oil that came out of it and clear, no chunks or metal so looks like run it for now, thanks all for your input! Really a heart sinking thing to see a part on the magnet! Does anyone know how to tell if the chain tensioner is bad w a nearly new chain? W these aftermarket (Odessa) heads and the cam I'm running w headers it sounds really good, w no new rattles etc, idles at 900. I'd hate to break down the motor for nothing. Thanks again.

 

[richard booth]

Did forensics on the oil filter and nothing foreign.

 

[DRanger024]

Thanks, an old timing tensioner broken to show hinge part? Only thing I can figure at this point. Thanks!

I do have the tensioner! I’ll dig through the tub when I get home from work.