Paccar Mx13 Low Oil Pressure

[pushbroom]

Truck came in for low oil pressure after a recent service. Idle was 20lbs should be north of 50.
Pulled out the spinner filter and found the lower bearing was unscrewed and coming apart. Installed the new bearing assembly and a new oil spinner, got 65lbs at idle.
Truck had an aftermarket filter, the aftermarket filters can spin too fast causing premature bearing failure. Havent seen one fail that only uses OEM filters.
Oem black filter on the left.

 

[Oxbow]

Truck came in for low oil pressure after a recent service. Idle was 20lbs should be north of 50.
Pulled out the spinner filter and found the lower bearing was unscrewed and coming apart. Installed the new bearing assembly and a new oil spinner, got 65lbs at idle.
Truck had an aftermarket filter, the aftermarket filters can spin too fast causing premature bearing failure. Havent seen one fail that only uses OEM filters.
Oem black filter on the left. View attachment 64930View attachment 64931

I don't know about everyone else @pushbroom , but I sure appreciate you sharing these bits of information.

Thanks

 

[Mike]

Different situation, but makes me think of when cars and trucks used to come into the dealer at Ford with knocking concerns at startup. first thing we would check is see if they had a Fram oil filter. No check valve and likely caused all sorts of early engine failure.

 

[Mike]

I don't know about everyone else @pushbroom , but I sure appreciate you sharing these bits of information.

Thanks

Same here, always like seeing information like this.

 

[Oxbow]

I'm not much on newer engines because our old B models and one 6NZ get what we need done in fine fashion, but I'm intrigued by the advances made, especially non-emmission related advances.

 

[pushbroom]

Ill see if I can remember to start takin more pics at work and getting some more threads started on here.

We are starting to get some neat things on engines now. I think the next massive step will be camless engines with electric solinoids running the valves. That opens up massive tuning possibilites.

 

[Oxbow]

Ill see if I can remember to start takin more pics at work and getting some more threads started on here.

We are starting to get some neat things on engines now. I think the next massive step will be camless engines with electric solinoids running the valves. That opens up massive tuning possibilites.

Wow, that's cool! Probably cut down on parasitic loss with no cam.

 

[pushbroom]

Wow, that's cool! Probably cut down on parasitic loss with no cam.

Parasitic loss will be down, not only can valve timing be changed, the length it is open can be changed as well. Engines can become smaller width wise, not having room for pushrods or an overhead cam. Fuel economy will be up. Less nox will be emitted due to complete control of intake air. It will be better in almost every aspect.
Probably a good 10 years away on large diesels however.

 

[Johndeere4020]

Truck came in for low oil pressure after a recent service. Idle was 20lbs should be north of 50.
Pulled out the spinner filter and found the lower bearing was unscrewed and coming apart. Installed the new bearing assembly and a new oil spinner, got 65lbs at idle.
Truck had an aftermarket filter, the aftermarket filters can spin too fast causing premature bearing failure. Havent seen one fail that only uses OEM filters.
Oem black filter on the left. View attachment 64930View attachment 64931

I don't know about everyone else @pushbroom , but I sure appreciate you sharing these bits of information.

Thanks

I agree, I find it very interesting.

 

[Johndeere4020]

Parasitic loss will be down, not only can valve timing be changed, the length it is open can be changed as well. Engines can become smaller width wise, not having room for pushrods or an overhead cam. Fuel economy will be up. Less nox will be emitted due to complete control of intake air. It will be better in almost every aspect.
Probably a good 10 years away on large diesels however.

Is there any chance a valve gets stuck open and contacts the piston?

 

[pushbroom]

Is there any chance a valve gets stuck open and contacts the piston?

Oh for sure. Wiring issues, short to power, sticky solinoids, bad intel from cam/crank, bad intel from ecm......
10 years at least. But it will happen eventually.

Might have to start out with a non interference engine (valves never occupy same space as piston) to start out with.

I dont think the freevalve guys have a marketable product yet.

 

[Johndeere4020]

Oh for sure. Wiring issues, short to power, sticky solinoids, bad intel from cam/crank, bad intel from ecm......
10 years at least. But it will happen eventually.

Might have to start out with a non interference engine (valves never occupy same space as piston) to start out with.

I dont think the freevalve guys have a marketable product yet.

It’s very intriguing, changes the way we think about things. Is it BMW or Mercedes that has the variable lenth connecting rod? Imagine the possibilities with something like that abf this.

I’ve thought for a long time that we’d have a viable diesel electric truck my now but that hasn’t happened

 

[pushbroom]

Never even heard of the variable length connecting rod before. Neat! We keep getting closer to being able to control every aspect of a motor. Look how far fuel control has gone since the early days.

Im all for a diesel/electric truck. 6 wheel drive. 100% torque at 0 rpm.

Im not even sure if Peterbilt sells a hybrid now even. Back in 09 or 10 we had a 330 hybrid in stock. It hung around getting shuttled between dealers for 4 years til a city picked it up for a dump truck I think. Never seen another one since or even heard much about them.

When I toured the factory we got to see the gas turbine truck. Couldn't get too close to it but the theory seemed ok. From what I heard it came down to the battery technology wasnt there at the time and neither Pete nor Walmart wanted to put any more money into it. Be neat if they got it going again as battery technology has advanced alot in the last couple years.



I really want to get my hands on a Tesla semi. Not even for the power pack, just for the rest of the truck. I think it claimed independent front suspension and I would like to see how it looks and I wonder what the long term maintenance is on it.

 

[Johndeere4020]

Never even heard of the variable length connecting rod before. Neat! We keep getting closer to being able to control every aspect of a motor. Look how far fuel control has gone since the early days.

Im all for a diesel/electric truck. 6 wheel drive. 100% torque at 0 rpm.

Im not even sure if Peterbilt sells a hybrid now even. Back in 09 or 10 we had a 330 hybrid in stock. It hung around getting shuttled between dealers for 4 years til a city picked it up for a dump truck I think. Never seen another one since or even heard much about them.

When I toured the factory we got to see the gas turbine truck. Couldn't get too close to it but the theory seemed ok. From what I heard it came down to the battery technology wasnt there at the time and neither Pete nor Walmart wanted to put any more money into it. Be neat if they got it going again as battery technology has advanced alot in the last couple years.



I really want to get my hands on a Tesla semi. Not even for the power pack, just for the rest of the truck. I think it claimed independent front suspension and I would like to see how it looks and I wonder what the long term maintenance is on it.

They had that Peterbilt/Walmart truck at the mid America trucking show a few years ago. You couldn’t get in it but you could get close and look in

 

[pushbroom]

Paccar variable length connecting rod..... one time use only.

 

[Humble pie]

Never even heard of the variable length connecting rod before. Neat! We keep getting closer to being able to control every aspect of a motor. Look how far fuel control has gone since the early days.

Im all for a diesel/electric truck. 6 wheel drive. 100% torque at 0 rpm.

Im not even sure if Peterbilt sells a hybrid now even. Back in 09 or 10 we had a 330 hybrid in stock. It hung around getting shuttled between dealers for 4 years til a city picked it up for a dump truck I think. Never seen another one since or even heard much about them.

When I toured the factory we got to see the gas turbine truck. Couldn't get too close to it but the theory seemed ok. From what I heard it came down to the battery technology wasnt there at the time and neither Pete nor Walmart wanted to put any more money into it. Be neat if they got it going again as battery technology has advanced alot in the last couple years.



I really want to get my hands on a Tesla semi. Not even for the power pack, just for the rest of the truck. I think it claimed independent front suspension and I would like to see how it looks and I wonder what the long term maintenance is on it.

I saw an old GMC cracker box in a junk yard once. I don’t know the year but it had to be early sixties. It had independent front suspension. It was just like the pick up version. Upper and lower A-arms with a coil spring in between.

 

[Johndeere4020]

Paccar variable length connecting rod..... one time use only.
View attachment 64983

Yeah that’s not gonna work.

I saw an old GMC cracker box in a junk yard once. I don’t know the year but it had to be early sixties. It had independent front suspension. It was just like the pick up version. Upper and lower A-arms with a coil spring in between.

The things we saw before camera phones

 

[Humble pie]

Yeah that’s not gonna work.

The things we saw before camera phones

Exactly. I’ve never seen it before or since.

 

[Oxbow]

Truck came in for low oil pressure after a recent service. Idle was 20lbs should be north of 50.
Pulled out the spinner filter and found the lower bearing was unscrewed and coming apart. Installed the new bearing assembly and a new oil spinner, got 65lbs at idle.
Truck had an aftermarket filter, the aftermarket filters can spin too fast causing premature bearing failure. Havent seen one fail that only uses OEM filters.
Oem black filter on the left. View attachment 64930View attachment 64931

I guess I had better ask......probably a stupid question to most of you....... a spinner oil filter uses centripetal force to help remove contaminants from the oil?

 

[pushbroom]

yup. bang on



A centrifugal filter may be included parallel to the lubrication system. In this case, some of the lubricating oil will flow via the thermostat to the centrifugal filter. The lubricating oil enters via opening (A) in the centrifugal filter. Under the centrifugal oil filter element, there is a spherical bearing (C) that ensures element (D) can turn easily when lubricating oil comes from the two nozzles against the bottom of the centrifugal filter housing. Centrifugal force separates the dirt particles and pollutants from the lubricating oil. The dirt particles are thrown against the wall of element (D) and are deposited there. The clean lubricating oil then flows back to the oil sump via opening (F).

Under the spherical bearing (C), there is a non-return valve (B). This non-return valve ensures that, if the engine is turned off, the main oil channel cannot completely leak out. Because of this, the lubrication system of the engine reaches pressure more quickly when starting up.