john compono Posted December 6, 2023 Share Posted December 6, 2023 so far I replaced rear main seal on my 55 century twice , no luck stopping the leak. so now we realized its time to pull the engine and replace the crankshaft due to pitting and some rust that we tried to sand off but the shaft is worn in some area's and its uneven preventing the rope seal from making a tight fit. soooo my question is, has anybody used a product called BLUE DEVIL REAR MAIN SEALER ? of what I read about it, supposedly it stops or slows down the leak. thinking about trying it till I have time to pull motor and take out crankshaft to be re-done. anybody use it before ? thanks guys. Link to comment Share on other sites More sharing options...
NTX5467 Posted December 6, 2023 Share Posted December 6, 2023 If it's something you add to the motor oil, it's probably a viscosity improver more than anything else. Putting 10W-40 in place of 10W-30 might work just as well? Whatever is in that product which MIGHT work will also be in the whole motor. It is probably meant more for the rear main seals which are post-rope, which means some type of rubber or silicone, which the product can cause to swell about 2% to decrease any gaps between the seal and the crankshaft. NTX5467 Link to comment Share on other sites More sharing options...
john compono Posted December 6, 2023 Author Share Posted December 6, 2023 NTX5467 RIGHT NOW I USE 20-50 OIL AND IT LEAKS BAD AFTER I TAKE IT FOR A RUN. MAYBE ILL TRY THE 10-40 FIRST AND SEE IF IT SLOWS DOWN JUST TILL I GET SOME TIME TO PULL ENGINE OUT AND GET IT DONE RIGHT. THANKS. 1 Link to comment Share on other sites More sharing options...
demco32 Posted December 6, 2023 Share Posted December 6, 2023 5 minutes ago, john compono said: NTX5467 RIGHT NOW I USE 20-50 OIL AND IT LEAKS BAD AFTER I TAKE IT FOR A RUN. MAYBE ILL TRY THE 10-40 FIRST AND SEE IF IT SLOWS DOWN JUST TILL I GET SOME TIME TO PULL ENGINE OUT AND GET IT DONE RIGHT. THANKS. I will not work, problem is the crankshaft. Link to comment Share on other sites More sharing options...
john compono Posted December 6, 2023 Author Share Posted December 6, 2023 yes demco32 thought maybe I could by a little time but I guess I'm just going to have to make some time very soon to re-do the crankshaft and fix this leak once and for all. 1 Link to comment Share on other sites More sharing options...
old-tank Posted December 7, 2023 Share Posted December 7, 2023 I just run it a quart and a half low and avoid situations that slush oil back to that seal. 2 Link to comment Share on other sites More sharing options...
EmTee Posted December 7, 2023 Share Posted December 7, 2023 You could try running SAE 30, but I think the best option is Old Tank's suggestion to run it ~ a quart low to avoid overwhelming the seal. Link to comment Share on other sites More sharing options...
john compono Posted December 7, 2023 Author Share Posted December 7, 2023 thanks old tank and emtee I will do that for the time being run it a little low in oil until I arrange a schedule to pull the engine. thanks. Link to comment Share on other sites More sharing options...
Smartin Posted December 7, 2023 Share Posted December 7, 2023 Is it a rope seal or neoprene? Some nailheads don't like the updated seals. 1 Link to comment Share on other sites More sharing options...
EmTee Posted December 7, 2023 Share Posted December 7, 2023 I'd only worry when it stops leaking... 1 4 Link to comment Share on other sites More sharing options...
john compono Posted December 9, 2023 Author Share Posted December 9, 2023 smartin I used a original rope seal the first time, then the neoprene seal and now tried a graph-tite rope seal and they all did not work. like I said I'm gonna have to pull the motor to get to the crankshaft. just wish it can be done from underneath without pulling the engine out. Link to comment Share on other sites More sharing options...
john compono Posted December 9, 2023 Author Share Posted December 9, 2023 EMTEE your not the first guy that told me that lol !! I just hate leaks. constantly putting cardboard under the car and always checking my oil level starts to get annoying. unfortunately the cranks gotta be redone and hopefully no more leak. 1 Link to comment Share on other sites More sharing options...
NTX5467 Posted December 10, 2023 Share Posted December 10, 2023 "Crank's got to be redone . . ." , due to normal wear or something else? Just curious, NTX5467 Link to comment Share on other sites More sharing options...
john compono Posted December 10, 2023 Author Share Posted December 10, 2023 YES NTX5467 CRANK HAS TO BE REDONE I'M GUESSING FROM NORMAL WEAR AND THAT THE CAR SAT FOR AWHILE AND CONDENSATION GOT IN THERE AND RUSTED IT A BIT AND THAT ITS WORN UNEVEN THAT THE ROPE DOES NOT HAVE A TIGHT FIT TO SEAL IT. SO ENOUGH OF MY PROCRASTINATING I GOTTA RE-DO THE CRANK. 1 Link to comment Share on other sites More sharing options...
Ben Bruce aka First Born Posted December 10, 2023 Share Posted December 10, 2023 AAHHH, those slippery slopes!! Ben Link to comment Share on other sites More sharing options...
john compono Posted December 11, 2023 Author Share Posted December 11, 2023 yes mr bruce unfortunately the slippery slopes !! lol ! 1 Link to comment Share on other sites More sharing options...
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