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Author Topic: LS Vtec build now oil leaking down back of block from headgasket  (Read 9201 times)

hamburgler

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LS Vtec build now oil leaking down back of block from headgasket
« on: April 11, 2009, 02:53:21 AM »
Ya so I'm helping a buddy build an LS vtec.  Well he built it, now Im just trying to help him with some problems.

As the title states, its a new complete rebuild, planed the block and head, everything is done right.  He said the head was torqed down to 80ft-lbs.  Now, as its running there is a small drip of oil running down the back of the block near to where he tapped and plugged the b16 head.  As I said its near the plug, but after having a mirror under the corner of the intake manifold, we can see 3/4 of the plug, the other 1/4 of the plug is covered by the head gasket and it doesnt appear to be coming from the actual plug.  So, I cant think of anywhere else its coming from.  Its definaly leaking at the head gasket as you can kinda see it dripping out with that mirror.

I also noticed hes using a cometic head gasket with an 82mm bore when his pistons are sized to 81.5mm.  Could this be the problem?
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turbo4life

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Re: LS Vtec build now oil leaking down back of block from headgasket
« Reply #1 on: April 11, 2009, 03:47:57 PM »
80 ft lb sounds a bit high 75 should the max safe with studs you can warp your block from over touring shit
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crxvtec91

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Re: LS Vtec build now oil leaking down back of block from headgasket
« Reply #2 on: April 12, 2009, 01:32:34 PM »
Quote from: turbo4life on April 11, 2009, 03:47:57 PM
80 ft lb sounds a bit high 75 should the max safe with studs you can warp your block from over touring shit

Dr.D does 90lb and runs 10.5 :noel:
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hotrex

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Re: LS Vtec build now oil leaking down back of block from headgasket
« Reply #3 on: April 13, 2009, 01:13:00 AM »
100 percent the plug.  this actually happened to me one on an lsvtec i built.\

take the plug out and weld the hole shut, then nigger it down with a fap disc. 

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hamburgler

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Re: LS Vtec build now oil leaking down back of block from headgasket
« Reply #4 on: April 13, 2009, 02:05:05 AM »
Quote from: hotrex on April 13, 2009, 01:13:00 AM
100 percent the plug.  this actually happened to me one on an lsvtec i built.\

take the plug out and weld the hole shut, then nigger it down with a fap disc. 



Ya its going to the machine shop tom to get a plug welded in.  There is nothing else in that area that sources oil.
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hamburgler

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Re: LS Vtec build now oil leaking down back of block from headgasket
« Reply #5 on: April 13, 2009, 02:32:40 AM »
It was thread locked originally.  Hes still getting 80psi oil pressure at idle???  Seems really high as Im getting 60psi at 5k+ and about 30psi at idle...  Exact same build, only 3 years older.  Oil pressure has always stayed the same for me.
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hamburgler

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Re: LS Vtec build now oil leaking down back of block from headgasket
« Reply #6 on: April 17, 2009, 03:02:48 PM »
For reference - the hole that was plugged is now drilled out and welded shut.  It does not leak anymore.
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92CXyD

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Re: LS Vtec build now oil leaking down back of block from headgasket
« Reply #7 on: April 17, 2009, 03:08:56 PM »
Quote from: hamburgler on April 13, 2009, 02:32:40 AM
It was thread locked originally.  Hes still getting 80psi oil pressure at idle???  Seems really high as Im getting 60psi at 5k+ and about 30psi at idle...  Exact same build, only 3 years older.  Oil pressure has always stayed the same for me.

I get 80psig at startup in my 'stang at idle until the engine is completely warmed up then I get 30psig.
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hamburgler

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Re: LS Vtec build now oil leaking down back of block from headgasket
« Reply #8 on: April 17, 2009, 03:11:42 PM »
Quote from: 92CXyD on April 17, 2009, 03:08:56 PM
Quote from: hamburgler on April 13, 2009, 02:32:40 AM
It was thread locked originally.  Hes still getting 80psi oil pressure at idle???  Seems really high as Im getting 60psi at 5k+ and about 30psi at idle...  Exact same build, only 3 years older.  Oil pressure has always stayed the same for me.

I get 80psig at startup in my 'stang at idle until the engine is completely warmed up then I get 30psig.

Ya that's what my buddy is getting.  I imagine its due to the oil thinning out as the motor heats up...?
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turbo4life

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Re: LS Vtec build now oil leaking down back of block from headgasket
« Reply #9 on: May 05, 2009, 03:55:52 AM »
i was told over torqing can warp a block from a N/A engien builder..
 


gangster shit doc D  90 ft lb. taht sounds sexy bad enough to shatter pistons and never pop a gasket!! :evil:
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