Breather hole on timing chain cover

crazypete · 12-21-2003, 01:06 PM

Hello all and happy holidays!

I was the subject of an unpleasant experience last night. I had just finished installing my rebuilt and suped AOD and had been babying the car for a few weeks to break it in and last night I let her have it on the way home. A few minutes of hard driving later, I smelled an intense burning smell and I went crazy scanning the car. When I pulled to a stop, smoke was billowing from the engine bay. A quick inspection revealed oil all down the passenger side of the enginebay including the smoking headers that were also covered in dino juice and the underside of the hood! Further inspection revealed almost completely dry areas around the head gaskets and valve cover gasket. I then traced the splash back to the troublesome little hole on the side of the timing chain cover. I had noticed this port on installation of my mechanical fuel pump port equipped timing chain cover.

What is this good for? I usually stick a bolt in it but apparently there's enough oilpan pressure (?!?) to eject it and squirt oil out the side of the engine!

420nitro · 12-21-2003, 01:24 PM

Yes, that needs to be plugged by a freeze plug! Then once you have it in then take a small screwdriver and smack the edge of it in. This will aid in keeping it in. Locktite would help out too.

420nitro · 12-21-2003, 01:29 PM

Quote:

Originally posted by 420nitro
Yes, that needs to be plugged by a freeze plug! Then once you have it in then take a small screwdriver and smack the edge of it in. This will aid in keeping it in. Locktite would help out too.

Heres a pic just to make sure we are on the same page.

crazypete · 12-21-2003, 03:58 PM

Oops =P

I guess this explains why I "burn" so much oil. Well at least the right side of my engine is now rustproofed and my girlfriend loves the smell and festive smoke!

Funny thing is it never really gushed oil until last night. I guess I have enough blowby to create pressure in the pan that manifests when I punch it

I'll go seal it up at once and thanks!

420nitro · 12-21-2003, 04:36 PM

I believe the reason way it didn't leak until last night is because of the rpms you were turning. Oil splash in the oil pan, and front cover is what pushed the oil out. I had a similar experance.

good luck

andy669 · 12-21-2003, 06:05 PM

That timing cover is from a different model and that hole is for the dipstick. Just plug it with whatever you can find.

Andy

tireburner163 · 12-21-2003, 11:59 PM

Quote:

Originally posted by andy669
That timing cover is from a different model and that hole is for the dipstick. Just plug it with whatever you can find.

Andy

ding ding ding ding ding. Correct

-Josh, aka the tireburner

12-21-2003, 03:58 PM	#4
crazypete Registered Member Join Date: Sep 2002 Location: Boston Posts: 592	Oops =P I guess this explains why I "burn" so much oil. Well at least the right side of my engine is now rustproofed and my girlfriend loves the smell and festive smoke! Funny thing is it never really gushed oil until last night. I guess I have enough blowby to create pressure in the pan that manifests when I punch it I'll go seal it up at once and thanks! __________________ 91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior

12-21-2003, 06:05 PM	#6
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	That timing cover is from a different model and that hole is for the dipstick. Just plug it with whatever you can find. Andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

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12-21-2003, 01:24 PM	#2
420nitro Registered Member Join Date: Nov 2003 Location: Rockford Posts: 596	Yes, that needs to be plugged by a freeze plug! Then once you have it in then take a small screwdriver and smack the edge of it in. This will aid in keeping it in. Locktite would help out too.

12-21-2003, 04:36 PM	#5
420nitro Registered Member Join Date: Nov 2003 Location: Rockford Posts: 596	I believe the reason way it didn't leak until last night is because of the rpms you were turning. Oil splash in the oil pan, and front cover is what pushed the oil out. I had a similar experance. good luck