What can I use to clean the block threads out?
What can I use to clean the block threads out? So since everyone including ARP told me to re do the heads with lube AND sealant then I'll do this tomorrow. I was also advised to clean the block threads out. Ok fine, but with what? The block is pretty fresh with only ARP ultra-torque lube so it shouldn't be too bad but I'll need something to get down in the holes with.
Also, since the head gaskets are only bolted down and never used, do I still have to replace them? Thanx
Also, since the head gaskets are only bolted down and never used, do I still have to replace them? Thanx
Yes if you separate the pressure entirely from the head gasket.. their cashed .they start out at one thickness and crush to another during tightening to seal, if you going to remove the entirely use a tap to chase the threads, Or if you haven't put sealant on them just pull one at a time add sealant and retorque.
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Last edited by defaultexistence; Aug 17, 2011 at 08:36 PM.
Also even though your block might have been cleaned by a machine shop, (hot tanked or pressure washed) the threads can still be dirty. Some of the books I have read recommend doing this prior to handing block over to machine shop to help minimize contamination of surfaces with grit near a fresh build.
If you just need to add sealer to the bolts you *could* pull one bolt at a time and throw sealer on it and put it back in and re torque and then move to the next.... then you would not need to replace the gaskets...
Not the most ideal way but it would work....
Not the most ideal way but it would work....
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You don't want to use a thread tap. The correct tool is a thread chaser. 
Over time through tightening and loosening, threads can become slightly distorted in the block. If you use a tap, instead of reshaping the threads you end up cutting them and actually make the threads weaker. A chaser simply reshapes the existing metal instead of removing it. It also helps to remove the gunk left in the threads. Use a light oil when chasing also. Do your best to vacuum out any dislodged gunk too.
Over time through tightening and loosening, threads can become slightly distorted in the block. If you use a tap, instead of reshaping the threads you end up cutting them and actually make the threads weaker. A chaser simply reshapes the existing metal instead of removing it. It also helps to remove the gunk left in the threads. Use a light oil when chasing also. Do your best to vacuum out any dislodged gunk too.
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This might not be a bad idea, and would save you some work. If you did this you might want to drain coolant. I would just follow the torque pattern when pulling bolt by bolt.
It's a freshly rebuilt shortblock on an engine stand. I am considering going bolt by bolt. Question is, which ones are dry threads and which ones aren't. This might save me some time.
Since this is on the stand, this will be much easier.
