Oil passage schematic

[1930]

Hello, 98 4.0 OHV, can't find it on all data and Google isn't my friend.

Can someone provide this too me. Thanks

 

[RonD]

Welcome to TRS

I don't recall ever seeing one for the Cologne V6 engines

 

[1930]

Thanksgiving for the reply.

So specifically how does oil get too top end?

 

[saskbill]

More general, non-engine specific discussion and pictures here, but lots of info on engine oiling and problems:

http://garage.grumpysperformance.com/index.php?threads/not-getting-oil-to-rockers.4537/

 

[1930]

More general, non-engine specific discussion and pictures here, but lots of info on engine oiling and problems:

http://garage.grumpysperformance.com/index.php?threads/not-getting-oil-to-rockers.4537/

Thanks, I'm looking for specific, I'm pretty familiar with conventional early V8.

If I find out I'll post info here. Seems to be a mystery to some people

 

[RonD]

The center pillar on rocker assemble has an oil passage that comes up through the head

Seen here: http://www.alliedmotorparts.com/med...33887a97daa66f/a/l/all12960-1_1280x851__1.jpg

Not sure where that passage in the block starts off?

The pushrods are solid so no oiling from lifters

 

[adsm08]

What is your specific reason for looking for this info?

I know that oil going to the lifters goes through the cam bearings first. Worn cam bearings were a common cause of lifter tick for the 2.9.

Like Ron, I am not certain of the path the oil takes to get to the rockers.

 

[1930]

I'd like to know so that I can address any issues that may come up with oiling but mostly at this point cause it seems no one else knows which amazes me

I have a 4.0 in my ranger, it's fun to understand how things work

 

[1930]

The center pillar on rocker assemble has an oil passage that comes up through the head

Seen here: http://www.alliedmotorparts.com/med...33887a97daa66f/a/l/all12960-1_1280x851__1.jpg

Not sure where that passage in the block starts off?

The pushrods are solid so no oiling from lifters

That hole runs over to one of the head bolt holes so not sure how that would help.

Also the bottom of the pedastal does not have a corresponding hole so it would seem to dead end at the bottom of the pedastal.

I've got great oil pressure and lots of oil on my top end but I just can't figure out where it's coming from

 

[adsm08]

I have a 4.0 in my ranger, it's fun to understand how things work

The 4.0 is a stroked 2.9. Oil flow through the system should be very similar.

 

[saskbill]

That hole runs over to one of the head bolt holes so not sure how that would help.

Also the bottom of the pedastal does not have a corresponding hole so it would seem to dead end at the bottom of the pedal...

On a 2.9, the oil flows up through a passage in the pedestal and through the hollow rocker shaft to the rocker arms. As noted by adsm above, worn cam bearings starve this oilflow before it reaches the pedestal. Also, crud accumulating in the hollow rocker shaft(s) can impede/block oil flow to the valves. If the 4.0 is similar, maybe someone else can chime in.

https://therangerstation.com/forums/showthread.php?t=9361

 

[1930]

On a 2.9, the oil flows up through a passage in the pedestal and through the hollow rocker shaft to the rocker arms. As noted by adsm above, worn cam bearings starve this oilflow before it reaches the pedestal. Also, crud accumulating in the hollow rocker shaft(s) can impede/block oil flow to the valves. If the 4.0 is similar, maybe someone else can chime in.

https://therangerstation.com/forums/showthread.php?t=9361

No passage in pedastal, the only possibility is that because that hole mentioned above is flared out into the pedastal bolt holes that oil is supposed to squeeze around that bolt up into the rocket shaft.

Looking at it again I guess I've answered my own question.

Silly design if that's the case

 

[TxGasRacer]

The OHV 4.0 is a great engine and is German Engineering at it's best

 

[adsm08]

No passage in pedastal, the only possibility is that because that hole mentioned above is flared out into the pedastal bolt holes that oil is supposed to squeeze around that bolt up into the rocket shaft.

Looking at it again I guess I've answered my own question.

Silly design if that's the case

The 4.0 is known for oiling issues at the rockers. That's why the pushrods "football".

 

[1930]

The 4.0 is known for oiling issues at the rockers. That's why the pushrods "football".

Football is the right word