861 thermostat gasket

Can't help you with a number.
I'd bet most of us here would just make one from a piece of gasket stock or even a post card.
Trace it out with a sharpie then take a pair of scissors and cut it out. Use a ball peen hammer to peen out the bolt holes.
EZ (and cheap)
 
i personally don't, unless the sealing surfaces are pitted or eroded.... but in this location it wouldn't end the world to use a lil permatex or rtv red / black / right stuff.... just don't get crazy. remember.. extruded sealer will clog the radiator.. AND you are gluing the cap and gasket on.. and the next fool that has to change it may cuss you :) ( and that next fool may be you ) :) BTDT thus i tend to plan on 'next time' when i make repairs..

if it is pitted or rough so that you think it wont seal. clean up the best you can with sand aper / wire wheel.. including the hose snout.. smear on thin and go with new gasket. same deal on hose snout. i have seen som soooo pitted they would not seal on a new hose.. thius a thin film of black rtv or similar to fill the potholes then push the hose on.. clamp, allow to cure, then circulate some water... cheack for floaters later. :)
 
Thanks. I knew someone here would have good advice. I'm having an overheating problem. It's getting hot after about 25 minutes of mowing. I washed out the fins on the radiator and its full of coolant, the belts tight so I'm going to try a new thermostat.
 
flow test the rad.

drain it in a bucket to save coolant.

p[inch off top hose. run a garden hose in top, pull bottom hose. rad should pass full flow from a 1/2" garden hose with none overflowing out the top.

while you are at it.. why not pull a core plug and wash the block out...
 
I'm not sure I know how to pull an expansion plug but I can do the test on the radiator. It will probably be September before I can get back to the work on the tractor again. It's on property in another state. Thanks again.
 
Sorry in taking so long to update. I did make my own gasket and changed the thermostat. In case anyone is looking I used a Stant 45356 and a Felpro 35258 will work if you don't want to make the gasket. The old thermostat had a door or flap that opened, I have never seen a thermostat like that before. I still have an overheating problem but I believe its because the radiator is getting plugged by the fine stuff. I can stop and clean the grill and radiator and it will cool off and run a while until it gets covered again. I have a screen wire over the radiator but the fine stuff is still getting behind it. Any advice on how to install the screen wire to prevent this?
Thanks.
 

Make it a point to mow by last week of June and you won't have anywhere near as much of that small stuff. Also your grass will grow stronger.
 
(quoted from post at 22:59:55 10/26/13) Sorry in taking so long to update. I did make my own gasket and changed the thermostat. In case anyone is looking I used a Stant 45356 and a Felpro 35258 will work if you don't want to make the gasket. The old thermostat had a door or flap that opened, I have never seen a thermostat like that before. I still have an overheating problem but I believe its because the radiator is getting plugged by the fine stuff. I can stop and clean the grill and radiator and it will cool off and run a while until it gets covered again. I have a screen wire over the radiator but the fine stuff is still getting behind it. Any advice on how to install the screen wire to prevent this?
Thanks.


a good fan-sealed shroud pulls all air thru the grill-radiator.
the only thing the screen is for is to give you an easier place to wipe off the chaff. (kind of a losing battle, on a tractor, air can come in under the grill piece and around the doglegs)
a sealed to the grill, fine screen stops more, but you have to wipe it off more.plugged screen-no air-overheat
I've mowed in conditions where I had to wipe the homemade screen I had directly on the radiator face every circle trip.
a long handled snow brush works ok and is more gentle than my hand.
Don't forget to wipe off your air intake screen too
 

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