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Oil Leak Diagnosis

gnick

New member
54
0
0
Location
chicago
Hello Everyone,

I bought an M1009 a few weeks back and have been slowly working through it. Last weekend I did the oil change and fuel filter change. While under the hood following the fuel filter bleeding process I noticed some oil on the passenger side header. It looks like it could be from the valve cover. After some research here I've found that the valve cover seals are a common issue as well as clogged CDR's, but before I started to tear into it I wanted to run it by some experts to see their thoughts. Please have a look.



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Assel

Member
197
7
16
Location
Germany Schwarzwald-Baar
do drips fall to the ground? my driver side head looks almost the same, but I never had to fill up any oil ..since I do the oil change regulary... but Id say its 95% the gasket
 

gnick

New member
54
0
0
Location
chicago
do drips fall to the ground? my driver side head looks almost the same, but I never had to fill up any oil ..since I do the oil change regulary... but Id say its 95% the gasket
I'm not noticing any drips to the ground. The underside of the bell housing does have some oil on it, but I never see any leaks on the ground. i just did the oil change so I dont know whether or not I'm losing any oil anywhere - although It was low when i got it from the PO. It was also really really dirty so i assume he just didnt change it often.

Thanks for the advice though guys - i'll try to torque the valve cover gasket to spec and see if that helps out.
 

welpro222

New member
393
0
0
Location
Bellingham, WA
Try what Matt65 says, try to tighten the bolts first. If you feel you want to reseal the valve covers, only use RTV sealant. Make sure you triple clean the surfaces with break cleaner and apply a good 1/4" thick bead of RTV and then let it dry for 24 hours before running.
 

welpro222

New member
393
0
0
Location
Bellingham, WA
Oil leaks are generally hard to find because our engines are greasy to begin with. I had a leak that coated my starter and I believed it was my valve cover also but it turned out to be my lift pump gasket.
 

cpf240

Active member
1,479
5
38
Location
Free in Northern Idaho
Two things:

1) A faulty CDR can lead to over-pressure in the crankcase, leading to leaks - though these usually show up at the rear main seal, so I doubt it would be casing the valve covers to leak. Some say replace the CDR, others say wash it in solvent and reuse.
2) Oil at the weep hole at the bottom of the bell housing can also be from a leak at the IP - the diesel washes everything down the drain and it comes out that point - the common spot is the throttle shaft seals, though the fuel supply and the injector lines are all right there as well.
 

Barrman

Well-known member
5,250
1,757
113
Location
Giddings, Texas
Just a dirty head and header without drips is something that can stay or get fixed. Depending on your level of OCD. If it is OCD, check the level regularly and normally it won't get any worse. However, if your OCD is actually CDO because that is the proper order. Then you better pull the intake, remove the injector lines and get some RTV in there.

3 of my 6.2 engines have at least one head dirty like that. They are still getting 5,000 miles to a quart of oil so I don't worry about it.
 

gnick

New member
54
0
0
Location
chicago
Just a dirty head and header without drips is something that can stay or get fixed. Depending on your level of OCD. If it is OCD, check the level regularly and normally it won't get any worse. However, if your OCD is actually CDO because that is the proper order. Then you better pull the intake, remove the injector lines and get some RTV in there.

3 of my 6.2 engines have at least one head dirty like that. They are still getting 5,000 miles to a quart of oil so I don't worry about it.
i appreciate the help guys. Nice to hear that it probably isn't a crisis. I'll keep an eye on it. For now I have a good running/driving M1009 that im pretty happy with. I'll working on the doghead mod this weekend and trying to clean up the electrical fiasco under the dash from the previous owner.
 

dstang97

Well-known member
1,859
30
48
Location
Clover, SC
Oil leaks are generally hard to find because our engines are greasy to begin with. I had a leak that coated my starter and I believed it was my valve cover also but it turned out to be my lift pump gasket.
I believe mine is leaking from there also. That or the turbo
 

tourus

Member
197
2
18
Location
madison me.
if it is a leak and not to awful bad drive it a while let the oil cover the under side as it is real good under coating. drive on a few dirt roads on a dry hot day a few times then fix it makes the under side last longer. it will amaze you were the spaying oil will go. just a thought.
 

cucvrus

Well-known member
11,462
10,395
113
Location
Jonestown Pennsylvania
They are still getting 5,000 miles to a quart of oil so I don't worry about it.
Wow 5,000 miles to a quart of oil. I change my oil every 2,000 miles. I always did on these older vehicles. It is cheap insurance to know that I always have clean oil. I don't waste the oil I burn it in the waste oil burner for heat in the work shop. I have a 2014 Silverado with 10 K on it. I only changed the oil once. I only change it when the truck tells me to. It seems to work this is the 3rd new truck that has the oil life system in it. But I never went over 2,000 miles on an older engine. Oil change is still the cheapest repair you can make. I use 15 40 Rotella T year round. I have engines with over 200,K on them and they are still cast iron colored on the inside. Some I work on I scrap the valve covers out with a putty knife. If it works for you keep doing it. I am a bit OCD about oil leaks and oil changes.
 
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