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slow oil leak

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cmm24601
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slow oil leak

Post #1 by cmm24601 » Wed Jun 28, 2017 8:13 am

I hope i didn't blow a gasket...

I've got oil dripping a few drops a day off the front of the transmission. It seems to be coming off the back of the oil pan. No apparent oil leak on either side of the engine or around the head gasket, but I can't really see behind the engine.

This started after a 150 mile drive through the Smokey mountains. I got stuck in traffic on I40 and noticed some bluish exhaust. Engine temp got as high as 215. Engine performed great the entire trip.

Before I go tearing the entire engine apart... can you guys point me towards some likely culprits?
1969 Mustang Grande
250 inline 6
Automatic Transmission
Autolite 1101 Carb

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chad
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Re: slow oil leak

Post #2 by chad » Wed Jun 28, 2017 9:41 am

There's a special detail for the pan and rear main gaskets members on here follow for that area.
Not sure but it looks like U just installed your engine?
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

cmm24601
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Re: slow oil leak

Post #3 by cmm24601 » Wed Jun 28, 2017 9:46 am

I did not install the engine. Previous owner rebuilt it. about 12000 miles on it.
1969 Mustang Grande
250 inline 6
Automatic Transmission
Autolite 1101 Carb

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chad
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rear main leak?

Post #4 by chad » Wed Jun 28, 2017 10:05 am

wonder if it's been leaking all this time?
Try the best to diagnose the exact leak location…
lotta times traveling down the rd, or even running the engine can "move the oil drip"
to displace what gravity does. Roof leaks in buildings can fool us on location (run down rafters, etc)
but this is even harder.
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

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woodbutcher
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Re: slow oil leak

Post #5 by woodbutcher » Wed Jun 28, 2017 11:23 am

:hmmm: Have you determined if it is motor oil or transmission fluid?Should be able to figure it out by smell.
Good luck.Have fun.Be safe.
Leo
"People never lie so much as after a hunt,during a war,or before an election".
Otto von Bismarck

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B RON CO
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Re: slow oil leak

Post #6 by B RON CO » Wed Jun 28, 2017 12:42 pm

Hi, If you determine the leak is engine oil I would GENTLY snug up the oil pan and valve cover bolts.I have stopped or slowed many leaks that way. Do not over tighten them or you can cause more problems. That should cure a gasket leak. A rear main seal or front tranny seal is a lot more work, so try the easy stuff first. Good luck
B RON CO. Still workin' on it!

1933 Ford Pickup - 59A Flathead V8
1966 Ford Bronco - U14 - 170/200 Straight 6
1966 Ford Mustang - 289 V8

cmm24601
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Re: slow oil leak

Post #7 by cmm24601 » Wed Jun 28, 2017 1:19 pm

I've been tracking it down by wiping it off and waiting for it to drip again.

After about 24 hours... no more drips. Any thoughts? I'm going to fill it back with oil and see how it does.
1969 Mustang Grande
250 inline 6
Automatic Transmission
Autolite 1101 Carb

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chad
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Re: slow oil leak

Post #8 by chad » Wed Jun 28, 2017 3:30 pm

how often do U put in how much oil?
more when driving vs just sitting?
do U see any of it burning (ie smoke out tail pipe)?
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

cmm24601
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Re: slow oil leak

Post #9 by cmm24601 » Wed Jun 28, 2017 3:38 pm

I just replaced the oil a few weeks and a 1000 miles ago. Something clearly went wrong on this trip to cause the leak and burn off. Hottest temps the oil pressure gauge fluctuated, which it never does.

I added a quart or two in the 6000 miles since the last oil change. I use full synthetic.
1969 Mustang Grande
250 inline 6
Automatic Transmission
Autolite 1101 Carb

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chad
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Re: slow oil leak

Post #10 by chad » Wed Jun 28, 2017 4:10 pm

cmm24601 wrote:I just replaced the oil a few weeks and a 1000 miles ago. Something clearly went wrong on this trip to cause the leak and burn off. Hottest temps the oil pressure gauge fluctuated, which it never does.
I added a quart or two in the 6000 miles since the last oil change. I use full synthetic.

Looks like you did an oil change (which includes filter) 1,000 mi ago. Not sure how much time ("...a few wks...").
Not sure if it's burning as well as leaking ("...the leak and burn...").
A Qt in 6,000 mi, not bad - 2 in same would be.

If ur concern developed after the oil change due to drips under the car & there were none B4 - look to changes created at that time.
Do U see smoke emitting from the tail pipe when running/warmed up (ie more than ~7 to 10 min when auto chokes flip for the i6)?
What color? White billow? grey soot? black cloud? 'nothing' to 'not much'…

What does the oil temp read or how high did it go for how long B4 it came to where it is now, normal?
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

cmm24601
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Re: slow oil leak

Post #11 by cmm24601 » Mon Jul 10, 2017 10:05 pm

I tightened down the oil pan (gently). It leaks again after idling for a few minutes. There's one bolt I can't reach due to a cylinder near the transmission. Pardon my ignorance, not sure what that is.

I'm pretty confident the leak is around the oil pan. Is it possible to replace the the oil pan gasket with the engine in the car? Basically, drain the oil, remove the pan, replace the gasket, reinstall the pan?
1969 Mustang Grande
250 inline 6
Automatic Transmission
Autolite 1101 Carb

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bubba22349
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Re: slow oil leak

Post #12 by bubba22349 » Mon Jul 10, 2017 10:32 pm

Yes you can replace the oil pan gaskets with the engine in the car it's not so hard. Good luck :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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Re: slow oil leak

Post #13 by ludwig » Mon Jul 10, 2017 11:34 pm

If you have tried tightening the bolts on the pan in an effort to stop the leak, you probably have crushed the cork gasket and deformed the lip of the pan. If you do drop it, straighten it out with a straight edge and some pressure. Like squeezing it between two pieces of wood with a C-clamp. Also use a good gasket sealer and use a liberal amount of sealer.
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chad
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Re: slow oil leak

Post #14 by chad » Mon Jul 10, 2017 11:56 pm

leaks just while running - I'm leaning toward valve cover & its dripping down (as gravety will do).

"...the leak and burn…"
still uncertain if there's 'oil burning'.

"...possible to replace the the oil pan gasket with the engine in the car."
Oh, yes! but some R more difficult (steering linkage to move, etc).

What model do U have?
What components do U C under there? any in the way?
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

cmm24601
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Re: slow oil leak

Post #15 by cmm24601 » Tue Jul 11, 2017 1:15 pm

Hey Chad I have the 1969 250 "M" head.

I will check the valve cover again.

The problem seems to be getting more intermittent. I drove it to work. No leaks...

I did not see any smoke or evidence of burning this morning either
1969 Mustang Grande
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Automatic Transmission
Autolite 1101 Carb

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ludwig
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Re: slow oil leak

Post #16 by ludwig » Tue Jul 11, 2017 3:12 pm

You know, Chad only posts all this practical stuff that actually works because he wants to keep his numbers up. That or maybe he has some valuable information to share. Something. I guess. :wink:
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chad
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Re: slow oil leak

Post #17 by chad » Tue Jul 11, 2017 4:19 pm

ludwig wrote:You know, Chad only posts all this practical stuff that actually works because he wants to keep his numbers up. That or maybe he has some valuable information to share. Something. I guess. :wink:


Yeah, like that gosh darned M head.

Not sure ur ultimate plans, cmm
( I've seen U here awhile so U probably know)
the head is an exellent candidate for the 2v direct mount carbs…

Ludwig - think U were da fourist 2 post 2 me as a "new guy" here. I remember it fondly'n have gotten some real kicks from ur sense of humor. Another dad-of-a-daughter makes a connection 4 me too (2 kids only, both, of the female persuasion).
:thumbup:
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

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Re: slow oil leak

Post #18 by ludwig » Tue Jul 11, 2017 4:34 pm

You get your daughters into an activity and they won't quit. That's the truth. The Navy offered my daughter a slot at engineer school but she wanted EOD. Ended up in SAR. Now she's a CrossFit coach.

She and I rebuilt the whole suspension on the 66, front and rear. I did one side, she helped. Then she did the other side and I handed tools to her. We both dropped in the rebuilt engine. And it fired right up.

Better than sports, for a fact. Life skills.
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chad
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Re: slow oil leak

Post #19 by chad » Tue Jul 11, 2017 4:53 pm

'N a dad who knows how to guide (show; den step outtada way!).
God's Planned Obsolescence
we gotta get outta da way... all da way (@ some point.)
.
My Pops is 92. Better health than me. I still go 2 him for 'stuff'.
But not that way w/21 & 31 y/o daughters. Wouldn't B right, wait'n C
Wait'n C... just amazing what's happening. Simple reasons 4 joy.
:wow:
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

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Re: slow oil leak

Post #20 by ludwig » Tue Jul 11, 2017 6:41 pm

True dat. You never know just what you set in motion when they are small.

Don't worry. Your two will be asking dad all kinds of stuff, just not what you expect.
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cmm24601
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Re: slow oil leak

Post #21 by cmm24601 » Thu Jul 13, 2017 8:47 pm

The leak is coming from the temp sending unit. Drips all the way down. I assumed the worst and just wasn't looking there.

Do you just use plumbers tape or high temp.silicone to seal?
1969 Mustang Grande
250 inline 6
Automatic Transmission
Autolite 1101 Carb

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chad
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Re: slow oil leak

Post #22 by chad » Thu Jul 13, 2017 9:04 pm

I'd say "Yes, the tape" but
ck the threads on both 2 C if a bit of grit or other contaminate f'ed em up.
If so a chase w/tap/die can correct...

Good Find, Sharp-eye!
U just moved up to Shade Tree Mechanic I !!!
:wink:
(I'm still at Apprentice/Garage Rat)
:oops:
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

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woodbutcher
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Re: slow oil leak

Post #23 by woodbutcher » Thu Jul 13, 2017 10:12 pm

:hmmm: If the temp sending unit is a one wire,don`t use tape or sealer on the threads.The unit grounds through the sender body,and the tape or sealer will interfere with the ground.Result will be errors in the readings on the dash gauge.OR,no readings at all.
Good luck.Have fun.Be safe.
Leo
"People never lie so much as after a hunt,during a war,or before an election".

Otto von Bismarck

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bubba22349
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Re: slow oil leak

Post #24 by bubba22349 » Thu Jul 13, 2017 10:55 pm

:hmmm: If the temp sender is leaking then it would also be coolant or water not oil, you can use some Permatex or silicon to seal the threads. You might also look a bit higher up at the valve cover gasket being your real oil leak. Good luck :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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