Fluid packing on engine block surfaces?
 

How do you interprete the fluid packing directions in the FSM for the engine block surfaces?

What are all the arrows around the bearings?

Should I put the fluid packing only around the upper row of the main bolts?

See attachement

Thanks,

Tapani

Re: Fluid packing on engine block surfaces?
 

I would say that those arrows are pointing out where not to put the fluid packing.

Re: Fluid packing on engine block surfaces?
 

Do not allow fluid packing to jut into O-ring grooves,
oil passages, bearing grooves, etc-


Bill

Re: Fluid packing on engine block surfaces?
 

See the thick flex (?) plate :rolleyes:

Getting ready for the ARP studs to arrive.

/T

Re: Fluid packing on engine block surfaces?
 

Make sure you put plans in to pull things back apart to retorque the ARP studs at the proper intervals. I've seen them lose torque overnight on a motor build. They have specific instructions about retorquing after a certain number of miles or warmup cycles (i forget exactly what it is) which on a subaru means pulling the valve covers and the cams to get to them.

This is why the OEM bolts are still preferred by many engine builders around my area. They are torque to yield bolts that stretch when torqued in the proper sequence. As the head gaskets settle the bolts stay tight because of the stretch in them.

Re: Fluid packing on engine block surfaces?
 

Thanks for your tip - I do not quite follow your reasoning, though.

I would tend to believe that the only thing which will settle is the gasket. This should be much less with an MLS type than the old OEM type.

"Stretch" bolts are used to even out the clamping force - when you load them above their yield point they will all have the same force. This will allow for the differences between the short and long bolts and any variation/errors in tightening them down.

BTW, I was not aware the SVX OEM bolts were of this type - if they are, they are "one life" and should be replaced every time you open them.

Kind regrads,

Tapani

Re: Fluid packing on engine block surfaces?
 

Yea, that is why the proper factory torque sequence is not a torque value, but a degreeing after reaching a set value. The degreeing is what stretches the bolts to their proper torque.

Re: Fluid packing on engine block surfaces?
 

Ok, makes sense.

There's a lot of misileading information around regaring the whole head bolt/stud preloading and the various types of HGs.

Not too long ago the official ARP company line was to "cycle" new threads a few times prior to final torquing. The relation between the actual preload force and the nut torque seems to "run in" - depending on a lot of things.

http://arp-bolts.com/pages/technical_installation.shtml

Look at the figure under title "The Lubricant Is The Key" - you see what "cycling" does for the clamping force. At least with lesser lubricants than the new one.

Interesting reading.

Here's something from 2008 on another forum (see thread #34):

http://forums.nasioc.com/forums/show...1451471&page=2

And something around the LS1: http://ls1tech.com/forums/generation...fasteners.html

I am tempted to "cycle" the new studs with the old HGs and see what happens :-) even though I do plan to use the "Ultra-Torque" lubricant.

Any comments?

/T

PS the torque-to-yield OEM bolts eliminate all this (effort to prevent preload scatter) in the automatic tightening along the manufacturing process, but I think will result in less preload force.

Re: Fluid packing on engine block surfaces?
 

Progress report:

The ARP 2000 head studs are absolutely brilliant. The manufacturing quality is awesome, the shanks are polished to a mirror and the threads sooooo smooth. The head markings are EDMed :cool:. See photos. There's app 2mm clearance to the cam gears.

I will install an OEM oil heat exchanger, the return to the water pump inlet cavity is shown in the photo. G1/4" threads, brass fitting sealed with ARP thread sealer.

Cam timing with all new components including the plastic covers.

Just a few odds and ends still missing - might get it running next weekend.

Kind regards,

/T