Mazda OE silicone sealant for oil pans
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Joined: Nov 2011
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From: South Orange County, CA
Mazda OE silicone sealant for oil pans
FWIW…
Browsing through some Mazda service information I found a part number for the silicone sealant that Mazda specifies their dealers to use for RX8 oil pan replacements; It is part number 8527-77-739 (the RX8 does not use a gasket, just the sealant).
The sealant seems to be available from Mazda, it’s about $27 a tube. I plan to pick up a tube and use this sealant when I do my pan reseal later this year…if it’s good enough for Mazda with their RX8 it should work for the FD - and no worries about whether it will get degraded by gasoline-diluted engine oil.
Browsing through some Mazda service information I found a part number for the silicone sealant that Mazda specifies their dealers to use for RX8 oil pan replacements; It is part number 8527-77-739 (the RX8 does not use a gasket, just the sealant).
The sealant seems to be available from Mazda, it’s about $27 a tube. I plan to pick up a tube and use this sealant when I do my pan reseal later this year…if it’s good enough for Mazda with their RX8 it should work for the FD - and no worries about whether it will get degraded by gasoline-diluted engine oil.
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Joined: Nov 2011
Posts: 842
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From: South Orange County, CA
No, I did see that it has been mentioned a couple of times in the forum though. The cost is not so much though for the OE material, so no real incentive to do anything else IMHO.
Joined: Mar 2001
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From: https://www2.mazda.com/en/100th/
it works great. its actually what they used at the factory when these things were new.
it actually is the same as something else, although i can't recall off the top.
it actually is the same as something else, although i can't recall off the top.
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Joined: Mar 2001
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From: https://www2.mazda.com/en/100th/
Also, in the FSM I noticed that when it specifies to use a grease or oil to lube up a o-ring or what not, it doesn't indicate what type of grease to use. Is there a reference sheet somewhere in there that does indicate what to use or is it a unwritten rule amongst mechanics to know what type.
Joined: Mar 2001
Posts: 31,857
Likes: 3,243
From: https://www2.mazda.com/en/100th/
Also, in the FSM I noticed that when it specifies to use a grease or oil to lube up a o-ring or what not, it doesn't indicate what type of grease to use. Is there a reference sheet somewhere in there that does indicate what to use or is it a unwritten rule amongst mechanics to know what type.
Joined: Mar 2001
Posts: 31,857
Likes: 3,243
From: https://www2.mazda.com/en/100th/
you're comparing apples to oranges. the Mazda remans use new housings and seals, and they screw that up too.
Rotary Freak
Joined: Jun 2005
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From: sydney
No idea what size tube you're getting, but you'd be paying more than double what it costs here for a conventional toothpaste style version of the stuff - it's just rebranded threebond. If you're getting a cartridge gun tube of the stuff, which they also make, that's a bargain on the other hand.
There's supposed to be a revised pan from Mazda now, utilizing one of the additional drillings in the rear plate, you'd need the steel mounts though.
There's supposed to be a revised pan from Mazda now, utilizing one of the additional drillings in the rear plate, you'd need the steel mounts though.
Right stuff used to be good. However they revised the formula, and now it has a warning that it isn't compatible with gasoline. Because all rotaries exhibit some degree of blow by, the gas that gets into the oil will break down the silicone and cause leaks in a relatively short time.
^Embedded in that earlier link, but that's what others have discovered as well...
Jan 2, 2016 UPDATE.
the correct silicone sealer MATTERS. all Permatex silicone sealers including The RIGHT STUFF (going forward to be known as The Wrong Stuff) have updated packaging and ALL carry a larger warning statement.... Not to be used with gasoline..
gas gets in our oil. period.
i did a study of 7 silicone sealers. i allowed each to cure for a week and tested them w my durometer. a durometer is used in racing to test hardness of tires. it is a probe on a spring w a dial.
most silicones registered about 60. higher is harder.
i then placed them in gasoline and another batch in E85 for a week. most reacted similarly. those placed in E85 lost approx 5 points. those placed in gasoline lost 25 points and the material seemed changed. sort of spongy.
all but HondaBond.
HB maybe lost 5 points. ThreeBond make most silicone sealers( including ToyotaBond, YamahaBond, MazdaBond) that compete w Permatex. i have spent more than an hour on the phone w them (as well as Permatex) and have tested a couple of their products that are very close to HB. they set up similar to HB but i find them a bit runny to apply. they are also about half the cost.
so it is HondaBond for me. i don't think there is any question that some pans leak because they are sealed w a Permatex product and it has become porous.
howard
the correct silicone sealer MATTERS. all Permatex silicone sealers including The RIGHT STUFF (going forward to be known as The Wrong Stuff) have updated packaging and ALL carry a larger warning statement.... Not to be used with gasoline..
gas gets in our oil. period.
i did a study of 7 silicone sealers. i allowed each to cure for a week and tested them w my durometer. a durometer is used in racing to test hardness of tires. it is a probe on a spring w a dial.
most silicones registered about 60. higher is harder.
i then placed them in gasoline and another batch in E85 for a week. most reacted similarly. those placed in E85 lost approx 5 points. those placed in gasoline lost 25 points and the material seemed changed. sort of spongy.
all but HondaBond.
HB maybe lost 5 points. ThreeBond make most silicone sealers( including ToyotaBond, YamahaBond, MazdaBond) that compete w Permatex. i have spent more than an hour on the phone w them (as well as Permatex) and have tested a couple of their products that are very close to HB. they set up similar to HB but i find them a bit runny to apply. they are also about half the cost.
so it is HondaBond for me. i don't think there is any question that some pans leak because they are sealed w a Permatex product and it has become porous.
howard
I used Hondabond about 8 years ago with a Garfinkle brace. Not certain what flavor it was...I just told the guy at the Honda dealership what I was doing and he sold me the tube. Regardless the pan is still bone dry after all these years.
That said, based on this you want HT:
Knowing which Hondabond to use - Honda-Tech
Prep is pretty important too. Chase all the threads, thoroughly clean both surfaces like an operating table, and make sure The pans mating flange is perfectly straight. I would absolutely use a brace as well.
That said, based on this you want HT:
Knowing which Hondabond to use - Honda-Tech
Prep is pretty important too. Chase all the threads, thoroughly clean both surfaces like an operating table, and make sure The pans mating flange is perfectly straight. I would absolutely use a brace as well.
Last edited by Sgtblue; Jun 26, 2016 at 09:21 AM.
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