Do I have a Rear Main Seal Leak?
Thread Starter
Supreme Member
Joined: Jan 2001
Posts: 7,164
Likes: 1
From: Someone owes me 10,000 posts
Car: 99 Formula
Engine: LS1
Transmission: T56
Axle/Gears: 342
Do I have a Rear Main Seal Leak?
I noticed some oil dripping down on my y-pipe today, does this mean I have a rear main seal leak. I just got this gm goodwrench 350 about two months ago, thankfully there is a warranty on it. By the way can a dealer ship put ceramic coating on headers.
------------------
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER
EDELBROCK 600CFM CARB.
KN AIRFILTER
UNDERDRIVE PULLEY
ACCEL HEI DISTRIBUTOR
2:73 GEARS
------------------
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER
EDELBROCK 600CFM CARB.
KN AIRFILTER
UNDERDRIVE PULLEY
ACCEL HEI DISTRIBUTOR
2:73 GEARS
Member
Joined: Apr 2001
Posts: 154
Likes: 0
From: Austin, Texas
Before you assume it's the rear main, check your valve cover gaskets 1st.
My full size blazer (350) and my camaro (305) have both had this problem and it was the valve gaskets. they tend to leak in the back when they get loose, and drip down making you think it's the rear main.
Just something to check out.....
Thomas.
------------------
1992 RS Camaro - Red
305-TBI/5 Speed Manual- centerforge clutch/3.08 geared rear
1.6 Roller Rockers and Cam / Adjustable Fuel Regulator with high flow pump / Open Air K&N Filter / TBI Spacer / ADS Super Chip & custom burned Off-Road Only chip
Headers - Cat Back system - Flow Master - dual chrome tips
adjustable Coni shocks & struts
My full size blazer (350) and my camaro (305) have both had this problem and it was the valve gaskets. they tend to leak in the back when they get loose, and drip down making you think it's the rear main.
Just something to check out.....
Thomas.
------------------
1992 RS Camaro - Red
305-TBI/5 Speed Manual- centerforge clutch/3.08 geared rear
1.6 Roller Rockers and Cam / Adjustable Fuel Regulator with high flow pump / Open Air K&N Filter / TBI Spacer / ADS Super Chip & custom burned Off-Road Only chip
Headers - Cat Back system - Flow Master - dual chrome tips
adjustable Coni shocks & struts
Thread Starter
Supreme Member
Joined: Jan 2001
Posts: 7,164
Likes: 1
From: Someone owes me 10,000 posts
Car: 99 Formula
Engine: LS1
Transmission: T56
Axle/Gears: 342
Wow, thanks, I checked behind the valve covers and I got some oil on my fingers, I retightned the wind nuts and I ran the car and turned it off and didn't notice any oil dripping down. My car as of a couple days ago started running rough at idle and when I gave it gas, now that I tightned the valve covers it cleared up, was I loosing compression or is there another reason for this?
------------------
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER
EDELBROCK 600CFM CARB.
KN AIRFILTER
UNDERDRIVE PULLEY
ACCEL HEI DISTRIBUTOR
2:73 GEARS
------------------
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER
EDELBROCK 600CFM CARB.
KN AIRFILTER
UNDERDRIVE PULLEY
ACCEL HEI DISTRIBUTOR
2:73 GEARS
Senior Member
Joined: Mar 2001
Posts: 547
Likes: 1
From: Pueblo Co usa
<font face="Verdana, Arial" size="2">Originally posted by Mark A Shields:
Wow, thanks, I checked behind the valve covers and I got some oil on my fingers, I retightned the wind nuts and I ran the car and turned it off and didn't notice any oil dripping down. My car as of a couple days ago started running rough at idle and when I gave it gas, now that I tightned the valve covers it cleared up, was I loosing compression or is there another reason for this?
</font>
Wow, thanks, I checked behind the valve covers and I got some oil on my fingers, I retightned the wind nuts and I ran the car and turned it off and didn't notice any oil dripping down. My car as of a couple days ago started running rough at idle and when I gave it gas, now that I tightned the valve covers it cleared up, was I loosing compression or is there another reason for this?
</font>
SSC
Member
Joined: Apr 2001
Posts: 154
Likes: 0
From: Austin, Texas
Hey, your welcome! Been there -- done that 
You could have been loosing power from oil seeping down into the rear spark plugs. You might want to change them out if it looks like it was.
Also, like SS Chevy said, the PVC system could have been getting incorrect readings due to your crank case pressure being off. But it shouldn't have been too far off.
Actually, now that I think about it, the oil collecting on the Y-Pipe will heat that pipe up A LOT! your O2 sensor may have been freaking out from the added temperature?
Thomas.
------------------
1992 RS Camaro - Red
305-TBI/5 Speed Manual- centerforge clutch/3.08 geared rear
1.6 Roller Rockers and Cam / Adjustable Fuel Regulator with high flow pump / Open Air K&N Filter / TBI Spacer / ADS Super Chip & custom burned Off-Road Only chip
Headers - Cat Back system - Flow Master - dual chrome tips
adjustable Coni shocks & struts
You could have been loosing power from oil seeping down into the rear spark plugs. You might want to change them out if it looks like it was.
Also, like SS Chevy said, the PVC system could have been getting incorrect readings due to your crank case pressure being off. But it shouldn't have been too far off.
Actually, now that I think about it, the oil collecting on the Y-Pipe will heat that pipe up A LOT! your O2 sensor may have been freaking out from the added temperature?
Thomas.
------------------
1992 RS Camaro - Red
305-TBI/5 Speed Manual- centerforge clutch/3.08 geared rear
1.6 Roller Rockers and Cam / Adjustable Fuel Regulator with high flow pump / Open Air K&N Filter / TBI Spacer / ADS Super Chip & custom burned Off-Road Only chip
Headers - Cat Back system - Flow Master - dual chrome tips
adjustable Coni shocks & struts
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