C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

LT1 oil leak. Help.

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Old Dec 30, 2002 | 10:45 AM
  #1  
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Default LT1 oil leak. Help.

Friends,

I bought a '94 roadster in September. I got it up on jackstands last night for the first time. I knew there was a slow drip, but the previous owner said she thought it was the drain plug on the oil pan.

Well, the leak is coming from the front of the engine somewhere up top. Can anyone give me a clue as to what this might be. Is there a particular place that is common for a leak on an LT1? Thanks!

Greg :(
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Old Dec 30, 2002 | 11:24 AM
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Default Re: LT1 oil leak. Help. (Greg Johnson)

intake manifold gaskets... the RTV at the front and rear blow out at about 80k miles or so...

very common problem. the repair is easy enough... its the 18-24 dry time that sucks. you must let the RTV set up right or it will leak again, very soon, too.

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Old Dec 30, 2002 | 11:51 AM
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Default Re: LT1 oil leak. Help. (Greg Johnson)

What you are seeing is rather common. :( Check your front main seal and your rear main seal as well as your intake manifold gasket. LT-1's are known to weep/leak from these areas.
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Old Dec 30, 2002 | 12:36 PM
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Default Re: LT1 oil leak. Help. (bogus)

Thanks, Andy.
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Old Dec 30, 2002 | 12:38 PM
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Default Re: LT1 oil leak. Help. (rubyred93)

Thanks, rubyred.
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Old Dec 30, 2002 | 01:17 PM
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Default Re: LT1 oil leak. Help. (Greg Johnson)

You're welcome - unfortunately I speak from experience with this same issue. I've also heard/read about it from many other LT-1 owners.
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Old Dec 30, 2002 | 01:20 PM
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Default Re: LT1 oil leak. Help. (rubyred93)

You're welcome - unfortunately I speak from experience with this same issue. I've also heard/read about it from many other LT-1 owners.
yup... me too... been there done that.

glad I help...
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Old Dec 30, 2002 | 01:31 PM
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Default Re: LT1 oil leak. Help. (rubyred93)

80,000 miles :lol: Mine started leaking at 28,000 miles.
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Old Dec 30, 2002 | 02:02 PM
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Default Re: LT1 oil leak. Help. (FantaC42)

Yeah, mine has 36,000. So, was the leak from the intake manifold or the front seal?

Greg
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Old Dec 30, 2002 | 03:52 PM
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Default Re: LT1 oil leak. Help. (Greg Johnson)

Check the crank position sensor. It's located at the bottom of the timing chain cover. It has an O ring seal. It's easy to change if you see any seepage around it. :)
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Old Dec 30, 2002 | 04:55 PM
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Default Re: LT1 oil leak. Help. (lead_foot)

leadfoot, thanks.

Greg :thumbs:
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Old Dec 30, 2002 | 05:40 PM
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Default Re: LT1 oil leak. Help. (Greg Johnson)

Mine started leaking last week from the rear of the intake manifold :eek: I'll be replacing mine this weekend :thumbs: :thumbs:
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Old Dec 30, 2002 | 05:51 PM
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Default Re: LT1 oil leak. Help. (bogus)

intake manifold gaskets... the RTV at the front and rear blow out at about 80k miles or so...
Mine went at 38k

very common problem. the repair is easy enough... its the 18-24 dry time that sucks. you must let the RTV set up right or it will leak again, very soon, too.
Interesting you mention the 18-24 hour dry time. I only let mine set for a couple of hours (just long enough to get everything back together again) and I haven't had any more leaks since.
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Old Dec 30, 2002 | 05:58 PM
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Default Re: LT1 oil leak. Help. (lead_foot)

Check the crank position sensor. It's located at the bottom of the timing chain cover. It has an O ring seal. It's easy to change if you see any seepage around it. :)
The 94 LT1 doesn't have a crank position sensor.
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Old Dec 30, 2002 | 06:24 PM
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Default Re: LT1 oil leak. Help. (cprgmr)

:eek: 18-24 hour dry time for the RTV :eek: I have never heard that before. I have put plenty of motors back together and I have never had an 18-24 hour dry time for RTV...and none of my motors have ever leaked :thumbs: :thumbs: :thumbs:

You must be using some sloooooooooooowwwwwwwwwww curing RTV :lol: :lol: :lol: :lol:
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Old Dec 30, 2002 | 06:27 PM
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Default Re: LT1 oil leak. Help. (69mako)

mine had the leak when I bought it at 27,000 miles.

Its a very common problem for a LT-1 :sad:
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Old Dec 30, 2002 | 06:28 PM
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Default Re: LT1 oil leak. Help. (69mako)

:eek: 18-24 hour dry time for the RTV :eek: I have never heard that before. I have put plenty of motors back together and I have never had an 18-24 hour dry time for RTV...and none of my motors have ever leaked :thumbs: :thumbs: :thumbs:

You must be using some sloooooooooooowwwwwwwwwww curing RTV :lol: :lol: :lol: :lol:
no... thats just what the consensus is on the forum... make sure its set up and dry... or else the likelihood of it blowing out increases... I let mine set 12 hours...
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Old Dec 30, 2002 | 06:29 PM
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Default Re: LT1 oil leak. Help. (Greg Johnson)

since you bought it in Sept...3 months?

I think I would visit the dealer 1st and see if he will pick up the tab for the repair....maybe he will at least offer to go half with you.

who knows... worth a try :yesnod:
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