longhungsilver

hey guys... well i changed my timing chain about a month ago or so...Previously my oil pan was leakin like a siv so i dropped it as well and cleaned out the oil pickup and re sealed it back up and its now fine... I changed the front crank seal and it started leaking right away (how nice) for wutever reason... I took the front apart about 2 weeks ago and sumhow the front crank seal got pinched so i switched it again and now as far as i can tell the engine (the front diff is a differnet story) isnt leaking any oil whatsoever. In those 2 weeks (about 250km of driving) i went through a quart of oil...I dont really see any blue smoke from the tailpipe...but im assuming its slowly under load burning oil..

My question is anyone else have a problem with this after changing the timing chain??? Today i changed the PCV valve to see if that helps although i seriously doubt it. Any input would be great

Justin

thook

Did you get a good seal at head? No leaks at the crank? As in, may need a repair sleeve?

TNRabbit

What about rear main seal, inside the belll housing?

longhungsilver

rear main seals new... did the clutch about 2 months ago...and i have a good seal at the head and the front crank seal shouldnt need a repair sleeve as its not leaking since i put in the new seal...

trythis

Could it be that your rear main seal is now leaking more than it was before. That new seal up front may have jsut been leaking enough to keep the pressure down? Does it work that way?

TNRabbit

Well, assuming there's no oil leak anywhere, I'd do a compression check next.

longhungsilver

yah i might do that today if i get a chance.. The rear main seal isnt leaking im pretty sure because by now and the ammount of oil ive gone through my clutch would be soaked and grabbing...since its not and theres no oil anywhere I got to assume its burning it... anyone had this problem after changing the chain, sprokets, tension etc...??? Why would it do this?

longhungsilver

did a compression test tonight... around 175-180 on all cylinders... i can try a leakdown test at school next week i hope to see if the valve seals are the problem Im guessing thats got to be it...

84sr5yoty

Have you checked the PCV valve and hoses for clogs or restrictions? A clogged PCV valve will cause oil consumption.

longhungsilver

no restrictions in the pcv hoses and I just changed the valve so we will see if that makes a difference... yet i think the old one was probably okay because it still rattled like it should

TNRabbit

I'm stumped. Good compression, no appreciable leaks on the exterior, no inordinate amount of blue exhaust smoke....where is your oil going??!?

R U sure someone's not playing an April Fool's joke on you?!?

longhungsilver

dude i wish!!! And im not playing around no blue smoke guys like I havent seen any.. i red lined it a bit while watching and nothing... startup has none either.... a quart every 2 weeks has to be going somewhere im waitin hopefully tuesday or wednesday at school i can do a leak down test and get more of a difinitive (wow i cant spell) answer on if the valve seals are okay or not... the compression test checked out but that doesnt necessarily mean the valve seals are good does it??

longhungsilver

well just an update... I did a compression test and every cylinder checked out just fine.. all of them were the same and all of them were well below acceptable...

I double checked for leaks and none were apparnt as i figured...

so as far as I can tell the oil control rings must be seized up/gummed up and are allowing oil from the oil pan up into the combusion chamber... sound reasonable?

still burning about 1 quart every 500km (2weeks)... So I am planning on once im down a quart running this gunk engine cleaner that you add to your oil and run your truck at idle for 5mins and then drain it out and do an oil and filter change...

anyone had any success with this stuff???

surf4runner

careful w/ the gunk stuff. if the motor has high mileage, it may clean out crud that is currently sealiing a minor leak. otherwise it should be fine.

w/o noticble leaks this may not be the answer but..
check to see if the old seal has worn a groove into the crank.
get another seal w/ a different thickness of the old so it seats at a new spot on the crank.

longhungsilver

hehe been there done that

theres one new development today... i took off my oil fill cap and the blowby was very excessive.. instead of sucking the piece of paper i put over the hole it pushed it up and wet it with oil... My pcv system isnt clogged it has good vaccuum sucking on it... so it appears my piston rings are shot??? despite what the compression and leakdown test said ??

So for now i routed my pcv to a beer can to avoid clogging my intake with oil... anyone do this before?? It makes sence in my mind... can i expect any problems??

and lastly any ideas if theres another possibility causing the blowby?? all i know is piston rings if sumone else knows of another cause id be oh so happy to hear it

thanks guys

merace19

valve guides will cause blow by also and suck oil.

TNRabbit

I thought you said your engine compression was well BELOW acceptable?

Yes, valve guides are the cause of excess blowby & oil consumption.

longhungsilver

thanks guys i was not aware of this... i guess that makes sence tho... and 5% leakage is well within spec... anything below 10-15 (and u want all the cylinders as close together as possible) is good...

rajin

u said u did timing chain change, did it cross your mind that u might be one chain link out of timing???

longhungsilver

can you elaberate on that for me?? not sure what you mean