Overheating/coolant loss on long trips - Page 3

cre · 04-24-2011, 02:21 AM

It's possible they're from a different engine altogether and as such the first five digits are different. But out of the 7M's family, that number would be for 0.50 over sized pistons (yes, 0.50mm). I can't find anything else and nothing pertaining to the MKIII Supra or any North American vehicles. If you research it and find more I'd love to know. I'd speculate about it being a superseding p/n if not for the fact that it's already taken.

BTW - Toyota liked that bore... there are a number of pistons which will fit the 7M but aren't meant to.

cre · 04-24-2011, 02:38 AM

Are they Aisin pistons?

87hilux7mge · 04-24-2011, 03:24 AM

yep they are aisin, its cast onto the opposite inner piston skirt. yea im curious too. ill see what i can dig up, might have to see about calling a few dealerships, or tomoco themselves.

the last few dealers i called didnt know jack shi* bout anything..

if i find out more ill post it up tho.

cre · 04-24-2011, 05:16 AM

It may also be used in the Cressida too, but the difference in compression ration is news to me... Then again, the Crown was an interesting case; It even had traction control available for the 7M.

87hilux7mge · 04-24-2011, 05:54 AM

yea its news to me too. the fact i got two motors with the same pistons is kinda crazy.

but yea, never seen em b4 with a stock motor. then again, out of the 3 ive seen apart, two have had the high compression bits.

cre · 04-27-2011, 12:41 AM

Well, if they're JDM they're most likely from a Cressida or a Crown... the latter being less common. I don't know much about the Cressida, perhaps the JDM ran a higher compression.

04-24-2011, 02:21 AM	#21
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	It's possible they're from a different engine altogether and as such the first five digits are different. But out of the 7M's family, that number would be for 0.50 over sized pistons (yes, 0.50mm). I can't find anything else and nothing pertaining to the MKIII Supra or any North American vehicles. If you research it and find more I'd love to know. I'd speculate about it being a superseding p/n if not for the fact that it's already taken. BTW - Toyota liked that bore... there are a number of pistons which will fit the 7M but aren't meant to. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

04-24-2011, 02:38 AM	#22
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Are they Aisin pistons? __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

04-24-2011, 03:24 AM	#23
87hilux7mge walbro fp Join Date: Dec 2010 Location: spokane Posts: 479	yep they are aisin, its cast onto the opposite inner piston skirt. yea im curious too. ill see what i can dig up, might have to see about calling a few dealerships, or tomoco themselves. the last few dealers i called didnt know jack shi* bout anything.. if i find out more ill post it up tho. __________________ 87 toyota 4x4 single cab short box pickup, 7MGZE.

04-24-2011, 05:16 AM	#24
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	It may also be used in the Cressida too, but the difference in compression ration is news to me... Then again, the Crown was an interesting case; It even had traction control available for the 7M. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

04-24-2011, 05:54 AM	#25
87hilux7mge walbro fp Join Date: Dec 2010 Location: spokane Posts: 479	yea its news to me too. the fact i got two motors with the same pistons is kinda crazy. but yea, never seen em b4 with a stock motor. then again, out of the 3 ive seen apart, two have had the high compression bits. __________________ 87 toyota 4x4 single cab short box pickup, 7MGZE.

04-27-2011, 12:41 AM	#26
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Well, if they're JDM they're most likely from a Cressida or a Crown... the latter being less common. I don't know much about the Cressida, perhaps the JDM ran a higher compression. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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