What could be the problem?!?!?!?

[phaetonv10]

And the new HG leaks.  
Oil seeps from the back of the engine, both sides. Got the studs retorqued today to 90 lb-ft. Didn't really work.
I was thinking I will continue driving as is and put some silicone or epoxy glue on the outside to stop the oil from seeping out.
Is it a good plan??

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[vanbcguy]

Neither silicon nor epoxy applied to the outside will do anything useful unfortunately.  Once the oil has gotten out of its passage and in between the gasket and the head it will go wherever it needs to till it finds a way out.

What did you do to prepare your head/block for the MLS gasket?  MLS gaskets require ABSOLUTELY smooth surfaces or they'll leak.  They are nowhere near as forgiving as the composite gaskets.

Also I thought the torque spec for the ARP diesel studs was higher than 90 ft-lbs?

[Rock3tman]

I did some work in May 2013 on a very low mileage rebuilt 1.9NA engine that had blown a thermostat housing and slightly overheated.   I say slightly,
because the overflow tank was pressurizing just a very small amount and coolant had no oil in it & engine oil had no coolant in it.   I replaced headbolts
one-by-one with ARP headstuds torqued to 120 ft-pounds - - no change in pressure leak.   Then I removed head, checked for warpage (none), cleaned
block deck and cylinder head surfaces throughly, installed new Victor Reinz MLS gasket liberally sprayed on both sides with Hylomar.   Torqued same studs
to 120ft-pounds and no coolant pressurization leaks over past 5,000 miles.      YMMV   

FYI>> my 12mm ARP headstuds instructions called for 120 ft.-pounds of torque.   Good luck on your fix.

[phaetonv10]

I ve driven the car 100 miles since the retorque and it has somewhat worked. I haven't really seen oil under the car.

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[phaetonv10]

And I installed a rebuilt practically unused head. My old head had corroded water ports. So that didn't require much prep, the block was thoroughly cleaned. That's about it.

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[R.O.R-2.0]

i believe most users go upwards to 120 ft lbs on these studs...

also, its a really good idea to spray your gasket with hylomar on both sides, unless you know your head and block are PERFECTLY FLAT..

[phaetonv10]

What's hylomar??

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[vanbcguy]

It is a sealing compound for gaskets, used in aviation and on some British engines.

[745 turbogreasel]

The MLS head gasket likes an extra smooth finish, 20RA(machinists roughness measurement), and should not require any extra sealant.   Most even specify 'install dry'.

Taken form Federal Mogal tech sheet.

MLS Gaskets - Surface finish

Max roughness <12.5 UM over .8mm sample length.

Max wavyness <10 UM '' 2.5mm '' ''

Flatness <25 UM '' 150mm ''