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Why studs on a Thermostat housing?
- Thread starter vping
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Hello Vping,
it's better to have studs into a casting rather than bolts as there is less likelyhood of damaging the tapped threads in the head (or any other casting), particularly in a location that is often dismantled.
I'm virtually certain the studs are 5\16" UNC, block end and 5\16" UNF, nut end.
Also I would not use stainless as it is often brittle and prone to thread pick up (usually when hot). Just use copper grease when assembling.
Alec
it's better to have studs into a casting rather than bolts as there is less likelyhood of damaging the tapped threads in the head (or any other casting), particularly in a location that is often dismantled.
I'm virtually certain the studs are 5\16" UNC, block end and 5\16" UNF, nut end.
Also I would not use stainless as it is often brittle and prone to thread pick up (usually when hot). Just use copper grease when assembling.
Alec
tony barnhill
Great Pumpkin - R.I.P
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Why? Saves bottoming out a bolt that's too long & cracking a head. 'Cause DPO's will do that, trust me!
dklawson
Yoda
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On the A-series engines it's very common for the t-stat housing to seize to the studs. This frequently means that changing the t-stat results in broken housings and/or snapped off studs. Is a broken stud in a head any better than galled threads from using a different material bolt?
I use stainless bolts instead of the studs. I also use anti-seize on the threads )AND way up the bolt shank) as Piman suggested. I don't want to break any more t-stat housings and using the anti-seize compound both protects the thread from galling and prevents the bolts from corroding to the housing.
As for running too deep or over torquing as Tony mentioned, you'll be selecting the bolts and you'll be tightening them. Buy the "correct" length so they don't bottom out and/or saw them off to length and file away the burrs on the cut end. That way you know they won't go too deep. As for over-tightening... if you're not over-tightening the nut on the stud why would you be more likely to over-tighten the bolts?
I use stainless bolts instead of the studs. I also use anti-seize on the threads )AND way up the bolt shank) as Piman suggested. I don't want to break any more t-stat housings and using the anti-seize compound both protects the thread from galling and prevents the bolts from corroding to the housing.
As for running too deep or over torquing as Tony mentioned, you'll be selecting the bolts and you'll be tightening them. Buy the "correct" length so they don't bottom out and/or saw them off to length and file away the burrs on the cut end. That way you know they won't go too deep. As for over-tightening... if you're not over-tightening the nut on the stud why would you be more likely to over-tighten the bolts?