Welcome to the Corvette Forums at the Corvette Action Center!

Oil Leak. Need Assistance

T

Tanzanite3

Guest
Our 91 has a slight oil leak. Seems to be from the rear of the engine. Looks like from below it is leaking from the head gasket??
The head looks quite dry and the moisture starts near the block where it meets the head. I've heard about a typical intake oil leak on L98's .. Can anyone steer me in the general direction of more information on this? How is it solved if this is it?

Thanks all.
 

Jack

Well-known member
Joined
Dec 27, 2000
Messages
1,825
Location
Florence, SC (Timmonsville SC)
Corvette
71 War Bonnet Yellow VERT 71 BH Blue CPE (SOLD)
"corners"... maybe?

Just a guess, but ... clean back of heads & rear of intake & adjacent block off REAL good ... then monitor closely ... focus on two sites: where the intake meets block ... and where intake meets head. Too often it'll leak in "the corner" where the intake & head & block meet. If so, often the squeeze-seal that lays atop the rear of block (seals intake to block) is faulty. If so, head removal is NOT needed. Pull intake and replace both R & L intake-to-head gaskets and replace both F & R intake-to-block seals. The 4 corners of seals will require liberal and "deft" applications of RTV sealant. Hope this helps ... let us know.
JACK:gap
 

Jack

Well-known member
Joined
Dec 27, 2000
Messages
1,825
Location
Florence, SC (Timmonsville SC)
Corvette
71 War Bonnet Yellow VERT 71 BH Blue CPE (SOLD)
Fisrt check the OP gage sender!

As you're cleaning back of motor ... clean the oil pressure gage sending unit that sits atop rear-most edge of block ... then monitor the sender area for leaks. Senders often spring a leak (or a weep) ... and replacements are cheap!
JACK:gap
 
8

84c4

Guest
Take a good look at the valve cover gasket also.
 
G

GreyGhost

Guest
Oil leak trick

Glenn:

One quick way to help find the source of your oil leak is to use a can of Brake Clean. Spray the back of your engine liberally and wipe it off. Drive the car and check for oil leak trail. A little dusting will reveal the source. Also check the base of your distributer, sometimes that gasket fails.
__________
:cool
Al
 
T

Tanzanite3

Guest
Thanks All

Thank you everyone for the input.. When it was up on the hoist we noticed that the seepage started at about block height but didn't seem to be as high as head / rocker cover height.. from that we eliminated the rocker cover gasket. We also checked the distributor area and it seemed to be quite dry as did the pressure sending unit. So, we wiped and sprayed clean all the underneath and will put it up on the hoist again sometime Monday (provided it doesn't rain all weekend!) and try to trace the source. I'll let you all know what happens. It does sound like the intake leak described... we'll look closely at that area.
Isn't it amazing how messy everything gets under there in a short time?
 

JT ZR-Won

Well-known member
Joined
Dec 6, 2000
Messages
1,273
Location
Bradenton, FL
Corvette
'90 ZR-1 #365 (SOLD...but Dad's got it now)
Re: Oil leak trick

GreyGhost said:
Glenn:

One quick way to help find the source of your oil leak is to use a can of Brake Clean. Spray the back of your engine liberally and wipe it off. Drive the car and check for oil leak trail. A little dusting will reveal the source. Also check the base of your distributer, sometimes that gasket fails.
__________
:cool
Al

You beat me to it Al. This is how I have found past oil leaks:D

Jay
 

vettenuts

Well-known member
Joined
Nov 13, 2000
Messages
123
Location
Wakefield, RI
Corvette
2002 Mag Red Convertible
Probably the rear intake seal. Just did mine this past winter.
 
S

Stingray

Guest
Re: "corners"... maybe?

Jack said:
Just a guess, but ... clean back of heads & rear of intake & adjacent block off REAL good ... then monitor closely ... focus on two sites: where the intake meets block ... and where intake meets head. Too often it'll leak in "the corner" where the intake & head & block meet. If so, often the squeeze-seal that lays atop the rear of block (seals intake to block) is faulty. If so, head removal is NOT needed. Pull intake and replace both R & L intake-to-head gaskets and replace both F & R intake-to-block seals. The 4 corners of seals will require liberal and "deft" applications of RTV sealant. Hope this helps ... let us know.
JACK:gap

Ihad a oil leak that was coming from the back of the motor and it turned out to be the sending unit that JACK is talking about.
 

Corvette Forums

Not a member of the Corvette Action Center?  Join now!  It's free!

Help support the Corvette Action Center!

Win Both Corvettes!

Win Both Corvettes and Get Extra Bonus Tickets Now!

Supporting Vendors

Dealers:

MacMulkin Chevrolet - The Second Largest Corvette Dealer in the Country!

Parts/Accessories:

Dead Center Foundation

Vetteskins

Advertise with the Corvette Action Center!

Partners

Top Bottom