Engine Oil leak from Trans mount

Anthonyvee90 · Mar 22, 2022

I have a 89 mustang gt with a t5. I recently changed the clutch out due to slipping. I also had a oil leak coming from the transmission mount. I switched the clutch out also did the pilot bearing and the rear main seal because I thought that’s what was causing the problem but ended up being the pcv valve that was leaking, so I switched it out as well. All said and done car is still leaking from the same spot.
Any help is greatly appreciated
Thanks in advance

96pushrod · Mar 23, 2022

Did you wash all the old oil off really well? Could be some just running down from before.

When you installed the rear main seal? Did you get a look at the crank, and did you see any scoring?

Did you loctite the flywheel bolts? If there’s no sealer of loctite on them they will leak oil as they are not blind holes.

Anthonyvee90 · Mar 23, 2022

I did not wash it well
The rear main was actually dry just switched it out because I already had it.
Yes I did loctite the flywheel bolts

Anthonyvee90 · Mar 23, 2022

96pushrod said:
Did you wash all the old oil off really well? Could be some just running down from before.

When you installed the rear main seal? Did you get a look at the crank, and did you see any scoring?

Did you loctite the flywheel bolts? If there’s no sealer of loctite on them they will leak oil as they are not blind holes.

I did not wash it well
The rear main was actually dry just switched it out because I already had it.
Yes I did loctite the flywheel bolts

vristang · Mar 23, 2022

Leaks at the pcv can be more problematic.
Does the pcv fit tight?
Is the metal mesh screen still in place?
Have you done a compresssion test?

Sometimes, it can be pressure from the crankcase, blowing oil out the pcv.
They can be tough to sort out…

Anthonyvee90 · Mar 23, 2022

vristang said:
Leaks at the pcv can be more problematic.
Does the pcv fit tight?
Is the metal mesh screen still in place?
Have you done a compresssion test?

Sometimes, it can be pressure from the crankcase, blowing oil out the pcv.
They can be tough to sort out…

Got a new pcv screen and grommet but it fits kind of loose.
No I haven’t done a compression test yet

Mustang5L5 · Mar 23, 2022

Assuming the transmission tailhousing is not cracked, it's possible the VSS/Speedo cable where it enters the trans is leaking. There's an O-ring in there that seals it.

General karthief · Mar 23, 2022

The title implies a trans leak, the leading post talks about the rear main seal and pcv valve and grommet, I'm guessing the oil leak is from back of the lower intake,
if the grommet for the pcv is a little sloppy, I smear some blue rtv around the outside of the grommet and when I install the grommet I give it a little twist just for good measure. I'm kinda weird like that.

Anthonyvee90 · Mar 23, 2022

General karthief said:
The title implies a trans leak, the leading post talks about the rear main seal and pcv valve and grommet, I'm guessing the oil leak is from back of the lower intake,
if the grommet for the pcv is a little sloppy, I smear some blue rtv around the outside of the grommet and when I install the grommet I give it a little twist just for good measure. I'm kinda weird like that.

Yes it’s motor oil traveling to the back
Ok I will get some blue rtv once I’m off work

limp · Mar 23, 2022

General karthief said:
when I install the grommet I give it a little twist just for good measure. I'm kinda weird like that.

Sheet man, nothing weird about that, just like plumbing up some PVC around the house......

Mustang5L5 · Mar 23, 2022

Engine oil is making it that far back? Wow

manicmechanic007 · Mar 23, 2022

Wow
Steam clean it and start over on the leak diagnosis

Anthonyvee90 · Mar 23, 2022

Starting to think it’s not engine oil but the speedo cable

Mustang5L5 · Mar 23, 2022

I don’t see engine oil making it that far back unless it’s blowing out at 70mph and the wind is pushing it back. You’d have oil everywhere in that case.

Anthonyvee90 · Mar 23, 2022

Mustang5L5 said:
Assuming the transmission tailhousing is not cracked, it's possible the VSS/Speedo cable where it enters the trans is leaking. There's an O-ring in there that seals it.

Starting to think it is the Speedo cable

Mustang5L5 · Mar 23, 2022

Anthonyvee90 said:
Starting to think it’s not engine oil but the speedo cable

I think so as well.

Spray engine degreaser and hose that down. The VSS has an o-ring, but I’ve found speedo cables themselves leak at the crimp. A good price of marine heat shrink will fix that.

Check your fluid level in your T5. When the fluid runs low, the needle bearings between the input shaft and mainshaft starve and will begin whining as the shaft scores. No fixing that of it happens without a major rebuild of the trans

Anthonyvee90 · Mar 23, 2022

Mustang5L5 said:
I think so as well.

Spray engine degreaser and hose that down. The VSS has an o-ring, but I’ve found speedo cables themselves leak at the crimp. A good price of marine heat shrink will fix that.

Check your fluid level in your T5. When the fluid runs low, the needle bearings between the input shaft and mainshaft starve and will begin whining as the shaft scores. No fixing that of it happens without a major rebuild of the trans

Just degreased it and hoses it down
And yes the transmission is whining.
When I did the clutch I also changed the transmission fluid and when I did hardly nothing came out

manicmechanic007 · Mar 23, 2022

Anthony,
So it is full of fluid now and still making noise?
Can you see where it is leaking now?
Maybe the tail housing is cracked or has a bad gasket (silicone) seal
Yes those speed sensors leak fluid occasionally

Anthonyvee90 · Mar 23, 2022

manicmechanic007 said:
So it is full of fluid now and still making noise?
Can you see where it is leaking now?
Maybe the tail housing is cracked or has a bad gasket (silicone) seal
Yes those speed sensors leak fluid occasionally

Yes it’s full of fluid now and still making the winding noise. No leaks since I cleaned it but I’ll check tomorrow to see if it’s leaking

Rdub6 · Mar 23, 2022

limp said:
Sheet man, nothing weird about that, just like plumbing up some PVC around the house......

We could find some other ways he’s weird?

Engine Oil leak from Trans mount

Anthonyvee90

Member

96pushrod

I think they're a little easier to get off

Anthonyvee90

Member

Anthonyvee90

Member

vristang

Anthonyvee90

Member

Mustang5L5

That is…until I whipped out my Bissell

General karthief

wonder how much it would cost to ship you a pair

Anthonyvee90

Member

limp

wrap a little cheese around it and its a done

Mustang5L5

That is…until I whipped out my Bissell

manicmechanic007

Anthonyvee90

Member

Attachments

Mustang5L5

That is…until I whipped out my Bissell

Anthonyvee90

Member

Mustang5L5

That is…until I whipped out my Bissell

Anthonyvee90

Member

manicmechanic007

Anthonyvee90

Member

Rdub6

So while I wait to figure out my rear end issues

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Engine Oil leak from Trans mount

Member

I think they're a little easier to get off

Member

Member

Member

That is…until I whipped out my Bissell

wonder how much it would cost to ship you a pair

Member

wrap a little cheese around it and its a done

That is…until I whipped out my Bissell

Member

Attachments

That is…until I whipped out my Bissell

Member

That is…until I whipped out my Bissell

Member

Member

So while I wait to figure out my rear end issues

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