R.E.D Posted January 31, 2021 Share Posted January 31, 2021 (edited) I'm installing the dual thermostats on the granite .I got Pai thermostats .they seem to have like metal spacer that goes between the thermostat housing and the thermostat? Does this sound right?does it go on the thermostat housing?rubber seal looks thinner than the stock one, but it could the old one is thicker because of age.i installed with said spacer and it pours the coolant out . pleased advice. Also if that spacer is not used the seal is lower than the deck.with the spacer, seal is above of the deck. Red Edited January 31, 2021 by R.E.D Quote Link to comment https://www.bigmacktrucks.com/topic/65727-pai-thermostat/ Share on other sites More sharing options...
MACKX Posted January 31, 2021 Share Posted January 31, 2021 (edited) I’m assuming what you mean by the spacer ,you mean the thermostat seal.... that will go in the housing and the thermostat bodies will pilot inside the seal.....did you take out the old seals before attempting to install the new thermostats? Edited January 31, 2021 by MACKX English correction Quote Link to comment https://www.bigmacktrucks.com/topic/65727-pai-thermostat/#findComment-468042 Share on other sites More sharing options...
R.E.D Posted February 1, 2021 Author Share Posted February 1, 2021 Yes sir..new seals are in ..I figured it out , it seems like the thermostat housing is pitted from cavitation and it would not seal...I know silicone is not to be used ,but I put just a dab to fill up the pits in the thermostat housing and it seems to be holding pressure. I will let it cure overnight and I will update in the morning. Quote Link to comment https://www.bigmacktrucks.com/topic/65727-pai-thermostat/#findComment-468043 Share on other sites More sharing options...
R.E.D Posted February 1, 2021 Author Share Posted February 1, 2021 If it does cure , it will give me time to procure a new thermostat housing . Quote Link to comment https://www.bigmacktrucks.com/topic/65727-pai-thermostat/#findComment-468044 Share on other sites More sharing options...
R.E.D Posted February 1, 2021 Author Share Posted February 1, 2021 I have attached a picture of the thermostat and the arrow is pointing at the metal spacer I was referring on the earlier post Quote Link to comment https://www.bigmacktrucks.com/topic/65727-pai-thermostat/#findComment-468045 Share on other sites More sharing options...
MACKX Posted February 1, 2021 Share Posted February 1, 2021 I see what your saying now........ can’t honestly say Ive used a PAI thermostat , always use Mack thermostats, hopefully it sets up and holds , gotta do what you gotta do till you can buy a housing... can always try permatex aviation form a gasket also if the pitting isn’t really bad ... that has got me thru a couple pinches till I could get parts on customers trucks and equipment Quote Link to comment https://www.bigmacktrucks.com/topic/65727-pai-thermostat/#findComment-468048 Share on other sites More sharing options...
R.E.D Posted February 1, 2021 Author Share Posted February 1, 2021 Yup...that ring was sitting on the pitted lip of the housing..after adding the permatex it sealed nicely ...I filled it back up with coolant..on second thought I should have waited until the permatex cured in order to add the coolant. Quote Link to comment https://www.bigmacktrucks.com/topic/65727-pai-thermostat/#findComment-468049 Share on other sites More sharing options...
fjh Posted February 1, 2021 Share Posted February 1, 2021 Did you use new coolant!? hope so the pitting is likely caused by poor Coolant the additives are used up in the old coolant! You best to use premix 50/50 coolants as you don't know what is in the water your mixing with straight coolant! interesting read here! https://www.ttnews.com/articles/nitrite-free-coolants-rise-due-more-aluminum-engines Quote Link to comment https://www.bigmacktrucks.com/topic/65727-pai-thermostat/#findComment-468067 Share on other sites More sharing options...
R.E.D Posted February 1, 2021 Author Share Posted February 1, 2021 (edited) New coolant , and I used the little gauge thingy to measure the concentration of antifreeze to water. And by the looks of it, thermostats were the stock original ones Edited February 1, 2021 by R.E.D Quote Link to comment https://www.bigmacktrucks.com/topic/65727-pai-thermostat/#findComment-468071 Share on other sites More sharing options...
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