HEMI: Intake to Heads Oil Leak
#1420295
04/15/13 02:43 PM
04/15/13 02:43 PM
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Joined: Jan 2003
Posts: 9,670 Lima, Peru
domingo
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EL Master
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Hi guys! This is the 3rd time Im having to remove my intake because it keeps sucking oil from the Valley area into the intake ports and then into the chambers, fouling the plugs with oil after a few minutes of running time.... I have checked proper alignment, bolt interference with the intake bolt holes, etc....face of intake is parallel with heads....so its not that the faces are crooked and not sealing right one against the other, they are nice and parallel whenI shim them and then I check them with a gauge on all 4 corners. I have glued the head side of the gasket to the head with silicone, and I have left the intake side of the gasket with NO silicone, just some grease....but its still sucking oil. Im sick of this so Im just gonna silicone both side of the gasket to assure a tight leakproof seal. Now, my other concern is the torque Im applying to the intake bolts. Richard Nedball's book asks for 25 ft-lbs torque on these bolts....but it sure looks like a lot to me. Its just 1/4" bolts threading into ALUMINUM cylinder heads. I have just tightened them with a small socket wrench till I felt they were were tight enough, didnt want to overtighten them and risk stripping threads on my brand new ALUMINUM heads!! Should I just go ahead and torque them at 25 lbs-ft??? Is it safe to do so on aluminum heads? Still it sound like a lot for such a small fastener threading into aluminum.
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Re: HEMI: Intake to Heads Oil Leak
[Re: hemi-challenger]
#1420297
04/15/13 04:15 PM
04/15/13 04:15 PM
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Joined: Jan 2012
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rickseeman
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Ditto, re-read that. It's 72 in lbs on some and I think 48 in lbs on the others. Thats 4 ft lbs and 6 ft lbs!!! The proper intake torque and sequence is in the Mopar Hemi engine manual which should be on top of your work bench.
2011 Drag Pak Challenger
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Re: HEMI: Intake to Heads Oil Leak
[Re: domingo]
#1420299
04/15/13 06:03 PM
04/15/13 06:03 PM
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Joined: Jan 2012
Posts: 2,631 Stuttgart, Arkansas
rickseeman
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I love Rich and his book is the best but it is wrong on this. Use the torque values and sequence in the Mopar Hemi engine book. That is the only way to do it right. The bolts will loosen up after you run it several times. Retorque every month until it settles in. If possible I prefer to use studs on aluminum heads. I get mine from ARP.
2011 Drag Pak Challenger
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Re: HEMI: Intake to Heads Oil Leak
[Re: rickseeman]
#1420300
04/15/13 07:05 PM
04/15/13 07:05 PM
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Posts: 7,477 Minnesota
Hemi_Joel
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I read somewhere that because the bolts are verticle, if you over-tork the intake bolts, it can wedge the heads apart and crack the block!
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: HEMI: Intake to Heads Oil Leak
[Re: Mopar_Rich]
#1420305
04/15/13 11:41 PM
04/15/13 11:41 PM
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Joined: Jan 2012
Posts: 2,631 Stuttgart, Arkansas
rickseeman
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Another thing to check is intake fit. Let's say the block was decked alot. Now the holes in the intake don't line up with the threads in the heads. The intake bolts end up hitting the sides of the intake. You can be tightening the intake and it feels snug but you are really just jamming the bolts. To check this, put intake manifold studs in the heads, (best without the intake gaskets on), and see if the intake manifold will slide all the way down to the head. If not you will have to get a rat tail file and elongate the holes in the intake manifold until it will slide down to the head without wedgeing into the studs.
2011 Drag Pak Challenger
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Re: HEMI: Intake to Heads Oil Leak
[Re: domingo]
#1420306
04/16/13 12:04 AM
04/16/13 12:04 AM
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Joined: Aug 2003
Posts: 43,123 Bend,OR USA
Cab_Burge
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Be very careful on which type silicone you use on intake gaskets, I like and use "adhesive" silicone only on any gasket that is exposed to oil Make sure the label says Adhesive silicone, not gasket maker or any other label Let it dry 24 hrs or more
Last edited by Cab_Burge; 04/16/13 12:06 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: HEMI: Intake to Heads Oil Leak
[Re: rickseeman]
#1420309
04/16/13 11:31 AM
04/16/13 11:31 AM
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Joined: Jan 2003
Posts: 9,670 Lima, Peru
domingo
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Quote:
Another thing to check is intake fit. Let's say the block was decked alot. Now the holes in the intake don't line up with the threads in the heads. The intake bolts end up hitting the sides of the intake. You can be tightening the intake and it feels snug but you are really just jamming the bolts. To check this, put intake manifold studs in the heads, (best without the intake gaskets on), and see if the intake manifold will slide all the way down to the head. If not you will have to get a rat tail file and elongate the holes in the intake manifold until it will slide down to the head without wedgeing into the studs.
I caught this the first time around and elongated the manifold holes....still after doing this im still sucking oil into the intake ports.....
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Re: HEMI: Intake to Heads Oil Leak
[Re: domingo]
#1420310
04/16/13 11:36 AM
04/16/13 11:36 AM
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Joined: Jan 2003
Posts: 9,670 Lima, Peru
domingo
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I glued it back on with grey silicone on both sides. Torqued the 4 center bolts more than the 4 outers....
we will see if the problem is solved this time around....
I used a set of MR Gasket 0,060 gaskets....even though they are thicker than what Id like to use for better port alignment(0,030 would be better) I am gonna try this time with the thicker ones to see if they seal better.
Port aignment is not exactly on center, its like the intake would like a thinner gasket to go down a bit more so the intake ports are more on center with the head ports....
although the intake is sitting a bit high and the ports are not perfectly concentric, I am still not seeing a "step" whhen looking down from the carb opening into the intake ports. The top oprtion of the intake runner is perfectly flush with the port roof on the heads, and the lower portion of the intake runner sits about 1/8" higher than the intake port...(the stage V intake ports are smaller than the head ports...the heads are CNCd and gasket matched,k the stage V intake is untouched, hence the smaller runner openings).
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Re: HEMI: Intake to Heads Oil Leak
[Re: hemi-itis]
#1420311
04/16/13 11:54 AM
04/16/13 11:54 AM
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Joined: Mar 2006
Posts: 9,910 Eighty Four, PA
B G Racing
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If leaking at the bottom persist carefully check the following areas: Head to manifold alignment(top to bottom) Head to manifold angle and gasket thickness that's required. Manifold to block rail spacing(make sure nothing is holding the manifold up) Head intake surface flat and not cut at an incorrect angle front to back,Check same for the intake surface. Make sure there is no warped surfaces. The angle and straightness can be checked buy using four block(steel) guages at all four corners then check all the areas at each port for discrepencies and if the four corners don't set tight on the corner guages then you know something is out of square. We usually use 2"X 1"X .060 thick block steel guages at all four corners and check for the manifold setting flush on the guages and then pass a aluminium welding rod flattened to just a hair under .060 through the port area to see if it's loose or tight in any one spot. We never use any torque values when tightening the intakes but use a sequence of side to side and repeat till there is no more bolt rotation with a 1/4 drive then we repeat it after the engine has heat cycled a few times.We also recheck them every few seasons if the engine sets for long period of time.
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Re: HEMI: Intake to Heads Oil Leak
[Re: domingo]
#1420312
04/16/13 12:01 PM
04/16/13 12:01 PM
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SCATPACK 1
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Dom what are you using to seal the ends of the intake to the block? Are you just using silicone or are you using the gasket that is supplied with the intake gaskets for the end rail. I had a problem with those gaskets holding the intake up too high and the intake gaskets would not seal properly. I left out those end gaskets on each end and just used silicone on the ends and then the intake gaskets sealed up on the ports with no leaks. Just a thought
Old Geezer Racing
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Re: HEMI: Intake to Heads Oil Leak
[Re: B G Racing]
#1420317
04/17/13 01:37 PM
04/17/13 01:37 PM
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roadhazard
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Quote:
Greg,(Superformance) make .030 and.060 gaskets.
Thanks Bob
Everything is listed in our new catalog. Click the link in my signature
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Re: HEMI: Intake to Heads Oil Leak
[Re: roadhazard]
#1420318
04/17/13 03:25 PM
04/17/13 03:25 PM
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B G Racing
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Quote:
Quote:
Greg,(Superformance) make .030 and.060 gaskets.
Thanks Bob
No thanks needed,thank you for some great gaskets and great customer service.
Everything is listed in our new catalog. Click the link in my signature
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Re: HEMI: Intake to Heads Oil Leak
[Re: B G Racing]
#1420319
04/17/13 10:24 PM
04/17/13 10:24 PM
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Joined: Apr 2006
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roadhazard
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Quote:
Quote:
Quote:
Greg,(Superformance) make .030 and.060 gaskets.
Thanks Bob
No thanks needed,thank you for some great gaskets and great customer service.
Everything is listed in our new catalog. Click the link in my signature
Hey Bob, if we didn't offer a great product with competitive prices and great service we'd just be considered a government entity
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Re: HEMI: Intake to Heads Oil Leak
[Re: domingo]
#1420322
04/19/13 10:41 AM
04/19/13 10:41 AM
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Joined: Apr 2005
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Dom What heads are you using? Is it possible to use a valley tray that would seperate the intake and lifter galley.
Old Geezer Racing
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Re: HEMI: Intake to Heads Oil Leak
[Re: domingo]
#1420324
04/19/13 10:54 AM
04/19/13 10:54 AM
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Joined: Mar 2006
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B G Racing
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Quote:
still leaking....when i take the carbs out I can feel "oily gasoline" on the intake to heads joint, and puddling on the intake valves that remain closed....its not just gasoline.
I would look for another issue,it could be a valve, ring or piston problem.If you want to check the gasket seal you can spray a libral amont of light oil(WD-40) in the intake and make plates to cover the carb holes and put an air valve in one,remove all the pushrods to make sure all valves are closed and carefully charge the intake(it only takes a few pounds of air for this).You can view the underside of the intake with a borescope ,mirror or other means for a fine mist if the gaskets leak.This sound like a lot of effort,but it will determine if that or something else is the issue.We had a Hemi that put oil in the intake and it turned out that it had one piston that had detonated and hurt the ring lands and rings.Another thought you might try is put a borescope in each sparkplug hole and check the condition of each piston. I'am throwing out suggestions since everything you have tried so far hasn't solved your problem.
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Re: HEMI: Intake to Heads Oil Leak
[Re: domingo]
#1420325
04/19/13 12:14 PM
04/19/13 12:14 PM
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Joined: Jan 2003
Posts: 13,356 Marion, South Carolina [><]
an8sec70cuda
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Did you put thread sealer on the inner row of head studs that thread into the bottom of the intake ports?
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: HEMI: Intake to Heads Oil Leak
[Re: an8sec70cuda]
#1420326
04/19/13 12:57 PM
04/19/13 12:57 PM
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Run it through a couple of heat/cool cycles and re torque or tighten the intake bolts again. then run it again and se if it is still doing it. When you pull the intake and look at the gaskets, do they look oily anywhere on the gaskets? Problem may not be the gaskets if you have tried all of this.
Old Geezer Racing
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Re: HEMI: Intake to Heads Oil Leak
[Re: domingo]
#1420329
04/19/13 06:33 PM
04/19/13 06:33 PM
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Keith Black®
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If you're pulling the heads anyway , get Tim to machine the intake side for O-rings. He's just done my heads I'll post pictures later.
-------------------------------- Darren Beale Keith Black Racing Engines®
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Re: HEMI: Intake to Heads Oil Leak
[Re: domingo]
#1420331
04/23/13 03:28 AM
04/23/13 03:28 AM
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Joined: Jun 2009
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Keith Black®
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yep I understand Dom. here's some pictures anyway I figured it would be worthwhile as some of the members on here indicated similar problems to what you're having. hope it works on my build
-------------------------------- Darren Beale Keith Black Racing Engines®
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Re: HEMI: Intake to Heads Oil Leak
[Re: domingo]
#1420334
04/24/13 09:24 AM
04/24/13 09:24 AM
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Joined: Mar 2006
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B G Racing
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Quote:
those look great.
I suspect it might be sucking some from the threads on the inner valley bolts. Like Chip suggested Im gonna use some thread sealer in there....
Im also gonna use some penetrating locktite sealer on the pushrod sleeves.
and when the heads are out check vave guide clearance and valve seals...
Another thing to check is crankcase ventilation,if it's not vented enough or has high crankcase pressure, the crankcase pressure along with cylinder draw can push and pull oil into intakes,bolt threads and other areas that wouldn't normally see oil.
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Re: HEMI: Intake to Heads Oil Leak
[Re: domingo]
#1420336
04/24/13 04:04 PM
04/24/13 04:04 PM
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Joined: Mar 2006
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B G Racing
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Quote:
I got the evac lines to the exhaust!
Make sure they are scavenging correctly.Some time the angle of the tube in the collector will not draw properly or if they are to far back to create a draw.
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