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Plenum gasket causing loss of oil?

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Old 03-18-2014, 12:31 AM
Brandontenold Brandontenold is offline
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Default Plenum gasket causing loss of oil?

I'm having a issue with my dodge, 1998 dodge with a 5.9l 360. Uses about a quart or better every 300-400 miles. I drive it rough so I expect it to be less if I was careful.

Truck runs like a top, but noticed my power isn't all there.

Gas mileage is okay.. But not great. Ordered a plenum repair kit.. But I was told if the oil fill up isn't sucking air when you put your palm on it (which it isnt) it's most likely toast rings.

I see a oily tint in my throttle body but can't get anything in there to see if it's pooled.

Before I spend a whole two days in this job.. Would you say this is my issue?
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Old 03-18-2014, 01:10 AM
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You can plug the end of the breather hose and remove pcv from valve cover to see if there is vacuum or positive pressure at pcv hole. I think you would have to have a pretty bad leak to confirm this way.
Does it blow a puff of blue smoke after sitting overnight? That would indicate bad valve guide seals. Could be a combination of both. What's mileage? Add truck info to your signature.
Removing the throttle body would give you a better look into the corners of the intake. Four bolts to remove and a 2.00 gasket.
Compression test, wet and dry would give you some more info about worn rings.
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Old 03-18-2014, 02:23 AM
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Have you read this?
http://dodgeforum.com/forum/2nd-gen-...um-thread.html


Once you have and if you still have questions then come ask them. This is why this thread is here and is a sticky.
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Old 03-18-2014, 11:35 AM
Brandontenold Brandontenold is offline
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Hmm Wow.. I always thought the rattling was a loose heat shield.. Seemed to go away if I played with the shield.. But maybe it was coincidence.. I seem to have all the symptoms so I guess I'll do the repair. I've also heard taking the plenum out will mess up the water pump.. Is it time for a waterpump replacement as well?
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Old 03-18-2014, 12:07 PM
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Plenum and waterpump are unrelated. You *can* do the water pump/timing chain at the same time, as you have to remove a lot of the same parts to do either job. (and, if you have a lot of miles on your truck, timing chain IS a good idea.)

But, don't expect doing the plenum to completely cure your oil consumption.... Reduce it? Sure, eliminate it? Only if you are really lucky.
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Old 03-18-2014, 01:43 PM
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Quote:
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Plenum and waterpump are unrelated. You *can* do the water pump/timing chain at the same time, as you have to remove a lot of the same parts to do either job. (and, if you have a lot of miles on your truck, timing chain IS a good idea.)


But, don't expect doing the plenum to completely cure your oil consumption.... Reduce it? Sure, eliminate it? Only if you are really lucky.
I don't have a problem with topping the oil off.. But I think three quarts every thousand miles is insane. I'd be happy with one quart every thousand, two thousand miles. I simply can't accept the fact I have blown rings.. Truck runs like a top. Starts good in the cold.. I'm shure a little wear is in them but I can't see it burning that much oil.. I've had freinds follow me and the only time it blows blue smoke is when I just sit on the gas pedal.. In gear or out of gear.. And it depends on the weather as well (contraction and expanding of plates?) But my friend has a dakota that does the same thing.. And it doesn't use any oil at all.
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Old 03-18-2014, 02:00 PM
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I was going thru a quart every 100 miles before I did the plenum, and the truck only smoked at startup..... after the plenum, I still go thru about a quart ever 200 miles or so.... and it still only smokes at start up.......
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Old 03-18-2014, 02:04 PM
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Quote:
Originally Posted by HeyYou View Post
I was going thru a quart every 100 miles before I did the plenum, and the truck only smoked at startup..... after the plenum, I still go thru about a quart ever 200 miles or so.... and it still only smokes at start up.......

Mine only seems to smoke on start up if I bump the key for a second and let off (used to starting newer dodges where you turn the key for half a second and it starts on its own) or if I try to start it with a low battery. Other than that it doesn't smoke at all. It runs really rich though, since I have a 180 thermostat in it.

I'm also looking into removing the death flash. I'm thinking dodges retardation of timing can also contribute to oil loss
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Old 03-18-2014, 02:25 PM
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Do a compression test and actually find put what your rings are at.
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Old 03-18-2014, 02:50 PM
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After finding out dad doesn't have a tester, ( I found his next birthday gift) Did some calling around and found one. I'll check and find some marginal test numbers for the 360 and get back to you all. (Finally a good excuse to clean my plugs)
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Old 03-18-2014, 02:52 PM
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Chrysler states 100PSI minimum. All cylinders need to be within 10% of each other. That's the most important.

For reference I had 150 across the board at 200k miles
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Old 03-18-2014, 06:44 PM
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After finding out dad doesn't have a tester, ( I found his next birthday gift) Did some calling around and found one. I'll check and find some marginal test numbers for the 360 and get back to you all. (Finally a good excuse to clean my plugs)
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Chrysler states 100PSI minimum. All cylinders need to be within 10% of each other. That's the most important.

For reference I had 150 across the board at 200k miles
What was your oil usage like?
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Old 03-18-2014, 06:52 PM
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My 5.9 is original as far as I can tell. 240,000 miles. Dry compression 160-165. Runs excellent and zero to 1/2 qt oil missing at 5k intervals.

Needs head gasket and will do plenum, chain and oil pump in a few days. WP is new.


I am stumped as to how my compression and oil use are so good at this mileage.
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Old 03-19-2014, 12:56 AM
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Quote:
Originally Posted by Snowfan View Post
My 5.9 is original as far as I can tell. 240,000 miles. Dry compression 160-165. Runs excellent and zero to 1/2 qt oil missing at 5k intervals.

Needs head gasket and will do plenum, chain and oil pump in a few days. WP is new.



I am stumped as to how my compression and oil use are so good at this mileage.

I heard mileage took a dive after the death flash to "fix" the pinging caused by a bad plenum. I had a very good increase in gas mileage after plugs and wires, opening throttle body, and driving a little more careful.. I can drive fill up plum full, and as long as I drive like a old grandma, the gas gauge won't move until I hit 100 miles.. My farthest instance gone on one tank is 300 miles. Not bad.
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Old 03-19-2014, 09:51 AM
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Quote:
Originally Posted by Brandontenold View Post
I heard mileage took a dive after the death flash to "fix" the pinging caused by a bad plenum. I had a very good increase in gas mileage after plugs and wires, opening throttle body, and driving a little more careful.. I can drive fill up plum full, and as long as I drive like a old grandma, the gas gauge won't move until I hit 100 miles.. My farthest instance gone on one tank is 300 miles. Not bad.
On a 26 gallon tank, that is only slightly better than 10 MPG......
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Old 03-19-2014, 10:02 AM
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Quote:
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On a 26 gallon tank, that is only slightly better than 10 MPG......
Yup. Gotta hit 300 around 20 gallons to hit 15mpg......
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Old 03-19-2014, 10:09 AM
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Quote:
Originally Posted by Snowfan View Post
My 5.9 is original as far as I can tell. 240,000 miles. Dry compression 160-165. Runs excellent and zero to 1/2 qt oil missing at 5k intervals.

Needs head gasket and will do plenum, chain and oil pump in a few days. WP is new.


I am stumped as to how my compression and oil use are so good at this mileage.
The magnum engines have a pretty solid bottom end. Could probably pop the heads off and have perfect cylinders.

Apparently the old LAs would be shot by 100k, cylinder scoring and low compression. Of course everything back then had terrible tolerances. And our trucks are old and obsolete compared to the new regulations
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Old 03-19-2014, 11:13 AM
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Quote:
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Yup. Gotta hit 300 around 20 gallons to hit 15mpg......
Exactly what I was told I'd get at the best for a 360.
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Old 03-19-2014, 12:19 PM
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Attempted to do a test last night, but ruined three plug wires because I was being stupid and didn't twist them off and then pull them. I'm also noticing my oil consumption isn't as bad after a new battery, and I've been driving a little less agressive. I topped it off 300 miles ago and it's still just over the safe mark. I was also told if I had bad rings, I'd lose a lot of oil pressure. My pressure is really good.. Stays within the normal scale.

I'm going to leave it alone. For now.

This weekend the plenum goes in. I've been doing a pile of research, I'm buying some seafoam and I'm going to let the plate soak In it, and run a can thru the intake when I'm done. Just hoping nothing is brittle and ends up breaking.. My parts truck was tipped over so I can get the T-case.. And I can't get to it with the 3 inches of mud we have if I break something.

Sooo... Anyone give me the torque specs for the TTY bolts and the plate bolts?
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Old 03-19-2014, 12:45 PM
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Rings have nothing to do with oil pressure. That's all bearings and such. Rings are just oil consumption.

Grab the 01 service manual from the faq section, there is a torque sequence you must follow on the intake, it is listed in there. (along with torque specs.)
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Old 03-19-2014, 12:45 PM
 
 
 
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