1979 C-121 0 #1 Posted January 6, 2015 Rebuild is almost done on my 8 speed, I just need to put the two halves together. When putting the new case gasket in, should I use some kind of shellac on the gasket? The parts guy at Toro said no, but he also seemed confused by the question, so I'm not sure if I believe him. Thanks guys! Share this post Link to post Share on other sites
can whlvr 993 #2 Posted January 6, 2015 well I don't know about shellac,ive put oil on some,some leaked after some didn't,know I use a small amount of gasket sealer on both sides before the gasket,like sandwhicheing it,but not so much it leaks inside when assembled Share this post Link to post Share on other sites
doc724 925 #3 Posted January 6, 2015 When I put mine back together, I put a little form a gasket on one transmission side, smear it with your finger, and then placed the paper gasket on top of it. Pressed it in place so that it would not move and then put the other half of the transmission on and assembled the bolts. Not a drop of leak. 1 Share this post Link to post Share on other sites
rmaynard 15,631 #4 Posted January 6, 2015 Make sure both surfaces are clean and smooth, and use nothing on the gasket. Just torque up the bolts and you should have no problems. Just my 2¢ worth. 5 Share this post Link to post Share on other sites
pacer 3,174 #5 Posted January 6, 2015 What doc says --- with a flimsy gasket like that its too easy for it to slip away from the proper surfaces so a slight amount of some kind of sealer (I like the RTV silicone types) on one side to prevent slippin&slidin can be a big help with that, not shellac. Share this post Link to post Share on other sites
stevasaurus 22,882 #6 Posted January 6, 2015 Your TORO dealer is correct and I agree with rmaynard. The Wheel Horse company never used gasket seal and I do not either. If your surfaces are clean, you should have no problem. If you feel you must use a gasket sealer, I would use Copper Coat in a spray can and just spray the gasket with a light coat. 2 Share this post Link to post Share on other sites
slammer302 2,155 #7 Posted January 6, 2015 If I have the gasket I use nothing if I don't have the gasket I use 518 loctite gasket maker works great its what I used when I used to build backhoe transmissions for CNH reman 1 Share this post Link to post Share on other sites
can whlvr 993 #8 Posted January 6, 2015 not to dis agree with some of you but ive split trannys mant times and have had some leak after with just the oem gasket,yes I torque them and do it like a cylinder head,i guess the case is a little warped,i don't know,but they are deadly clean,proper oem gasket which I keep 2 or 3 on hand allways,ya some don't leak,most don't but ive had at least 3 that did and now I don't fool around and use a SMALL amount of gasket sealant,when toro built these they were brand new,so of coarse they don't leak,with a lot of use I guess some arnt exactly flat anymore,just my 2 cents 1 Share this post Link to post Share on other sites
stevasaurus 22,882 #9 Posted January 7, 2015 Don, I totally agree with what you are saying also. You know when someone asks a question like this, you are going to get 35 different opinions...and not one of the opinions is wrong. I think I would be more into what type of gasket sealer to use. If you are just looking to stick a gasket so it does not move around on you with no slop over mess, I really like Copper Coat in a spray can. The thing I do not like about sealer...if you have to go back into the trans. 1 Share this post Link to post Share on other sites
doc724 925 #10 Posted January 7, 2015 Stevasaurus, What is this copper coat? I am not familiar with it and where do you get it? Share this post Link to post Share on other sites
pfrederi 17,905 #11 Posted January 7, 2015 Stevasaurus, What is this copper coat? I am not familiar with it and where do you get it? Permatex Copper-Spray -A-Gasket Item 80697 at any autoparts store Originaly designed I believe mostly for head gaskets. http://www.permatex.com/products-2/product-categories/gasketing/gasket-sealants/permatex-copper-spray-a-gasket-hi-temp-sealant-detail Share this post Link to post Share on other sites
stevasaurus 22,882 #12 Posted January 7, 2015 Correct Paul. I think I bought my last can at Auto Zone. I don't know if I would use it for head gaskets, but in the old days, when gas stations worked on cars, we would use it on rocker cover gaskets, water pump gaskets, thermostat gaskets, side cover gaskets, It looks like it actually has particles of copper in it and is very sticky. It also comes in a can with an applicator. Very good stuff. Share this post Link to post Share on other sites
pfrederi 17,905 #13 Posted January 8, 2015 Correct Paul. I think I bought my last can at Auto Zone. I don't know if I would use it for head gaskets, but in the old days, when gas stations worked on cars, we would use it on rocker cover gaskets, water pump gaskets, thermostat gaskets, side cover gaskets, It looks like it actually has particles of copper in it and is very sticky. It also comes in a can with an applicator. Very good stuff. I have used it on a couple of old tractor head gaskets (water cooled). Never did it on Kohlers as I never had a sealing problem with them, and the head may get hotter on an air cooled engine. 1 Share this post Link to post Share on other sites
Jake Kuhn 1,556 #14 Posted January 8, 2015 You can probably get by without sealer, but I always use it to be safe, on my first 2 piece trans rebuild it leaked so I took it back apart and used permatex ultra black, I've never had one leak since. 2 Share this post Link to post Share on other sites
can whlvr 993 #15 Posted January 9, 2015 off topic but I use the high temp copper on used head gaskets,when I buy an old tractor and I pull the head off,i don't want to spend on a new gasket till I know it runs 1 Share this post Link to post Share on other sites
