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Guest Message by DevFuse
 

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Oil Consumption fill the oil and check the gas 2000 2.5 SOHC


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13 replies to this topic

#1 lmdew

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Posted 11 January 2014 - 09:07 AM

154K on the motor.  Previous owner had bent all 8 intake valves so I replace the valves and head gaskets.

 

Runs great but using oil like mad.  No external leaks, no smoke to speak of.  

 

Ran it 300 miles yesterday at 75 or so, down almost 3 quarts.

 

PVC is valve is good

Ran Seafoam in the oil for about 30 miles and then changed the oil before my 300 mile trip.

 

 



#2 Fairtax4me

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Posted 11 January 2014 - 10:01 AM

Replace the PCV if its old, even if it rattles the valve mechanism can still be bad.

If the oil changes were neglected at some point in the past the oil control rings may be seized, and could take some time to free up. Might try running some MMO in it and drive it easy for an hour or so, then change the oil again.

#3 lmdew

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Posted 11 January 2014 - 07:10 PM

Backed it into the garage today and got on the throttle pretty good.   Yes it smokes.  

Replaced the PVC valve and I'm running some MMO with the oil to see if it frees up the rings.  

 

Might be a rebuild.

 

Hard to  believe it runs so well.  It's like I'm driving the old Caravan with the 3.0 smoker in it again.

 

Thanks Larry



#4 Fairtax4me

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Posted 11 January 2014 - 11:25 PM

Someone here had rings seized so bad they completely lost compression on one cylinder. MMO cleared it up and brought back compression. Worth a shot for the $8 for a bottle. Use a half quart now and the other half in the next change.

#5 lmdew

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Posted 12 January 2014 - 05:48 AM

Thanks, have some MMO in it now and more visible smoke so it's doing something.  Fingers crossed!



#6 lmdew

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Posted 01 March 2014 - 07:11 AM

Back to this project:

 

New Subaru PCV installed.  It decreased consumption some but not much.  Still using over a qt for every tank 300 miles.

Ran MM Oil in the engine trying to free up any possible stuck rings

 

Plugs very black and oily,  

 

Cylinder             Compression               Leakdown

1                         135                             100/96 = 4%

2                         140                             100/97 = 3%

3                         140                             100/97 = 3%

4                         135                             100/96 = 4%

 

The leakage was heard in the oil fill, so it's going past the rings but I don't think it's excessive.  For the Compression reading, remember I'm at 6300 ft here in Colorado so the numbers are lower than what you'd see at sea level.

 

Once my Oil Pan Oring seal gets here I'm going to drop the pan and inspect that seal.  If it's not that seal, what else could it be?  

 

The engine runs great, Head Gaskets just completed.  No external leaks.  New Subaru PCV.



#7 1 Lucky Texan

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Posted 01 March 2014 - 11:41 AM

have you checked the oil pressure? just wondering if a stuck relief valve could cause high usage?

I once read of someone that had the PCV and breather hoses all cross-connected and they had weird issues with oil.

just wild guesses since you seemed open to them!

#8 Fairtax4me

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Posted 01 March 2014 - 01:33 PM

Only other thing I can think of is maybe the PCV hoses are all clogged up with crud.

You didn't ever say what engine this is.

#9 luko

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Posted 01 March 2014 - 03:34 PM

If the PCV hoses were plugged wouldn't there be a vacuum in the crankcase...so you could put a vacuum gauge on the dipstick tube or the oil filler tube and see a vacuum on the gauge? 



#10 lmdew

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Posted 01 March 2014 - 08:33 PM

2001 2.5 SOHC.

 

I will double check the lines, but I believe they are all correct and clean.

 

Thanks, Larry



#11 lmdew

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Posted 31 March 2014 - 09:57 PM

Gunk Engine Cleaner helped, as I ran the engine with it in the oil I could hear the change.  The oil consumption is down but still high, a quart of more every tank, 300 miles.

 

I can get the engine to smoke out the tail pipe if I rev the engine numerous times quickly Idle to 4000 RPM and back.  Steady RPM it's no smoke.

 

Review of items done and the engine:

 

154K 2.5 SHOC 2000 - Had bent intake valve, so I surfaced the head, glass plate and replaced and lapped all the valves.  Engine runs great.

- New Subaru PCV 

- All hosed clean and connected properly

- Seafoam in the gas and Oil

- MMO in the oil

- Leak down check, see numbers above

- Gunk Engine cleaner, seemed to help but did no solve the problem

- No external leaks

- Runs Great

 

Pretty much down to stuck Oil control rings, engine pull.

 

Thoughts?



#12 Fairtax4me

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Posted 31 March 2014 - 10:18 PM

Did you ever remove the oil pan?
There is a ring seal on the pan for a tube that connects to the bottom of the separator chamber. If the seal is broken or gone it apparently causes high oil consumption.

High vacuum in the intake can pull oil past worn intake valve stem seals. Usually this is noticeable if you coast down a long hill in low gear that keeps the engine speed up and intake vacuum high for a prolonged period.
Did you replace the stem seals when you did the valves?

#13 lmdew

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Posted 01 April 2014 - 05:16 AM

Sad to say, I have not gotten to the Pan, nor did I replace the valve stem seals.  

 

I know I could do both with the engine in the car but might just be easier to pull it.  

 

It will go to the sideline for a month or so, got 6 other ones that I'm working on and lots of travel for work.

 

Thanks for the feedback!

 

Larry



#14 Fairtax4me

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Posted 01 April 2014 - 11:08 AM

I'd have to call it stem seals.

Keep 1/4 - 1/2 quart of MMO in it. The oil control rings lands in the pistons have drain holes that do have a tendency to plug up with infrequent oil changes, then the rings get stuck. MMO or a high mileage motor oil may clean them out. Neither one will hurt so its worth a shot.




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