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  1. #11
    Super Member crazyal's Avatar
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    Dec 2003
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    Northern Vermont

    Default Re: Oil pan - Use gasket or Hi Temp Red RTV

    What type of gasket did it have? Was it a thin one or thick like a valve cover gasket? Is the pan sheet metal pressed into shape? Often I see sheet metal pans where the holes for the bolts get bent because the bolts were over torqued. It usually happens with the thicker gaskets. Once it happens your best option is to replace the pan or find stiffeners like they use with some valve covers to put pressure in between the holes.

    If you do use RTV, clean the surfaces well and then let it dry before adding any oil, at least over night. Secondly it's better to use a thin layer of RTV on a gasket than a thicker layer all by itself as you'll have less chance of it squishing out inside the pan and flaking off only to get caught in an oil passage.
    Kubota L4240,Case 580K backhoe, Case 450 Dozer

  2. #12
    Elite Member jonyyuma's Avatar
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    Sep 2010
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    35 miles North of Memphis,TN
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    kubota L3000dt, ford 8n1952

    Default Re: Oil pan - Use gasket or Hi Temp Red RTV

    Steel pans can have the dimples taken out, from over-torque, if you are careful. First I would insure the bolts were properly tightened from past repairs? Check to see if the pan really is the culprit? I have used rtv very sparingly to seal a gasket to the pan, or Indian sealer, or Permatex. Chevrolet did thousands of them for years,with rtv, no gaskets involved... but sloppy ness can cause major failures.>
    Okay, Legal disclaimer: Old but not senile, definitely do not have the answer to everything!

  3. #13
    Super Star Member Diamondpilot's Avatar
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    Jan 2007
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    14,313
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    Daleville, IN
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    Jinma 254/284 Ford 861 Powermaster at work

    Default Re: Oil pan - Use gasket or Hi Temp Red RTV

    RTV and the only sealant is used all the time but I would go back with a gasket if available. Most every rear diff I have had apart and lawn mower trannys also only use RTV for a gasket.

    Chris

  4. #14
    Elite Member Car Doc's Avatar
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    Mar 2009
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    3,246
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    Kansas
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    YM3810D Yanmar

    Default Re: Oil pan - Use gasket or Hi Temp Red RTV

    Quote Originally Posted by thatguy View Post
    I had the auto transmission (2500 Dodge Ram Cummins - 47RE) serviced about a year ago and had the repair shop install a new OEM transmission gasket (which i was thinking was rubber-ish)..

    It appears that the pan is now leaking so I may need to drop the pan and do something with the gasket so it stops (after I check to make sure the bolts are not loose)..

    Do you recommend using a new gasket OR making my own gasket with Permatex High Temp Red RTV gasket maker?

    Specs call for 13/ft-lbs for the gasket but the RTV says something like - outline pan edge and around the bolt holes, let it set up, tighten until it oozes out.. Wait an hour and then tighten another 1/2 to 3/4 turn..

    I have never used RVT before and not so sure about the bolts not being very tight - which method would least likely leak?

    Brian
    A cork/rubber gasket is the best type gasket because the cork is just a better sealer and after oil gets near it the rubber swells up and helps keep the gasket under tension.

    With that said RTV is a better sealer on a tin pan. Just pound out the bolt holes backwards slightly with a tap hammer so the hole pulls in to the case. Clean the surfaces with brake clean real good and try to make sure the trany is done dripping when you do this add a light even smear RTV on the case and the biggest portion on the pan (like sticking 2 pieces of tape together) but remember you dont have to put more than 1/8" thick and just tighten it about 1/4" ratchet tight and leave it overnight if at all possible. hth also I use hi temp gray or black not the super high temp red stuff for what that is worth....

  5. #15
    Veteran Member K7LN's Avatar
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    Michigan
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    JD455 & JD790

    Default Re: Oil pan - Use gasket or Hi Temp Red RTV

    I like a cork gasket and Permatex sealer. For RTV use, things have to be super clean. When working under a transmission that was full of oil, it always goes drip, drip, drip.
    JD 790 w/70 FEL & 7 BH on turf tires
    JD 455 w/60" MMM & 54" front blade

  6. #16
    Veteran Member orezok's Avatar
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    Jan 2004
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    1,105
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    Mojave Desert, CA
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    Kubota B7800

    Default Re: Oil pan - Use gasket or Hi Temp Red RTV

    I would go strictly by what the manufacturer recommends, not the counter man at xyz auto parts or this is the way we always did it. Attached is the Factory service manual for current model Dodge truck since about 2002.

    The 47RE is the same basic transmission.
    Attached Thumbnails Attached Thumbnails -pages-20xx-dr-sm-jpg  

  7. #17
    Elite Member jonyyuma's Avatar
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    35 miles North of Memphis,TN
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    kubota L3000dt, ford 8n1952

    Default Re: Oil pan - Use gasket or Hi Temp Red RTV

    Hey Car Doc, I also use brake clean for those areas, plus you can rinse the pan. No chance of fiber or fuzz from wiping.The hardest part is cleaning the magnet. Matter-of-fact the last couple times draining pan did not even need to change the cork gasket..
    Okay, Legal disclaimer: Old but not senile, definitely do not have the answer to everything!

  8. #18
    Elite Member Car Doc's Avatar
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    Kansas
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    YM3810D Yanmar

    Default Re: Oil pan - Use gasket or Hi Temp Red RTV

    Quote Originally Posted by jonyyuma View Post
    Hey Car Doc, I also use brake clean for those areas, plus you can rinse the pan. No chance of fiber or fuzz from wiping.The hardest part is cleaning the magnet. Matter-of-fact the last couple times draining pan did not even need to change the cork gasket..
    There ya go!

  9. #19
    Elite Member
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    Mar 2005
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    Bedford, VA
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    John Deere 2320

    Default Re: Oil pan - Use gasket or Hi Temp Red RTV

    Quote Originally Posted by yankeerider View Post
    Is the vehicle driven daily? Reason I raise this question is I have experienience with a different auto that had a poorly seated anti-drainback valve. (Keeps the torque converter from draining into the tranny when not running, which can overflow the trans, causing it to leal through vents and other penetrations.)

    At first inspection it looked like the pan gasket, but after changing out several times I realized that was not the problem. A vehicle driven daily or close to that will not exhibit such a problem, but one that sits for a week (or more) at time will.
    Interesting - I do not drive it daily, only a few times a week (about 7k miles/yr).. So this may be the problem - what am i looking for in trying to see if it is the anti-drainback valve?

    Brian
    Bedford, VA
    2320 w/ 62D MMM, 200CX FEL, Pats EZ Change, LX4 Cutter
    Co-owner (with my father) of John Deere 790, 30 HP, 4x4, 513 cutter, 70 FEL
    2012 Nissan Xterra Pro-4x

  10. #20
    Veteran Member K7LN's Avatar
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    Default Re: Oil pan - Use gasket or Hi Temp Red RTV

    Quote Originally Posted by orezok View Post
    I would go strictly by what the manufacturer recommends, not the counter man at xyz auto parts or this is the way we always did it. Attached is the Factory service manual for current model Dodge truck since about 2002.
    Gee, it doesn't say anything about cleaning the surface areas. If the manual doesn't say it, I guess we don't have to do it. So much for the manual.
    JD 790 w/70 FEL & 7 BH on turf tires
    JD 455 w/60" MMM & 54" front blade

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