:::RHMT::: Real Home Made Turbo

General Category => Hybrid/Tech => Topic started by: hamburgler on April 11, 2009, 02:53:21 AM

Title: LS Vtec build now oil leaking down back of block from headgasket
Post by: hamburgler 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?
Title: Re: LS Vtec build now oil leaking down back of block from headgasket
Post by: 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
Title: Re: LS Vtec build now oil leaking down back of block from headgasket
Post by: crxvtec91 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:
Title: Re: LS Vtec build now oil leaking down back of block from headgasket
Post by: 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.
Title: Re: LS Vtec build now oil leaking down back of block from headgasket
Post by: hamburgler 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.
Title: Re: LS Vtec build now oil leaking down back of block from headgasket
Post by: 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.
Title: Re: LS Vtec build now oil leaking down back of block from headgasket
Post by: hamburgler 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.
Title: Re: LS Vtec build now oil leaking down back of block from headgasket
Post by: 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.
Title: Re: LS Vtec build now oil leaking down back of block from headgasket
Post by: hamburgler 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...?
Title: Re: LS Vtec build now oil leaking down back of block from headgasket
Post by: turbo4life 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: