Nissan Piston ring codes

[tarekss123]

I am new to this so any help will be appreciated. When checking NOS NIssan Part numbers i realized that in many instances there is more than one OEM number. Even in the RIK catalogue more often than not there are numerous OEM numbers for the same set. 

 

12033-H8900 2033-H7200 12033-H9910 12033-H8660

 

the aforementioned OEMs are for the same A14 piston set.

 

Also in the RIK catalogue the OEM is usually for the STD Piston ring set. However, oversized Nissan pistons experience a change in the first part. Many of the ones i saw changed in the same pattern 12033 is STD set, 12036 is a .5, and 12037/12038 is a 1.00.

 

I have a set for the A14 that has an OEM of 12037-H8920

 

I was told that this OEM is not a valid OEM for the A14. However, i already checked it and it is indeed a valid OEM. 

 

Part Number: 12037-H8920
Supersession(s): 12037-H7200; 12037-H8900; 12037-H8910; 12037H8920; 13021-H8910

 

the above is from NISSAN USA 

 

https://parts.nissanusa.com/p/89392271/12037-h8920.html

 

The OEM was superseded by the same A14 ones on the RIK catalogue

 

Also the actual rings are the same exact size as the A14

 

76 × 2 × 3.2 
76 × 2 × 3.4 
76 × 4 × 3.4

 

so not only is the OEM code on the box a valid Nissan Code for the A14 the actual rings are the same measurement as well 

 

 

[datzenmike]

In the Nissan world ANYTHING is possible. 12037-H8920 possibly is for an A14 produced after '82 and used elsewhere in the world. The last A14 was in the '82 210. I'm only saying buyers need to know there is a discrepancy in the numbers and should find out if they will work in their earlier A14.

 

12037-H8920 does not come up as used on any '74-'78 B-210 '76-'79 F10 '78-'82 N10 or '79-'82 210.   

 

Can you find an application for 12037-H8920? Maybe a year or car? 

[tarekss123]

There is no discrepancy since all the numbers superseded are for an A14 from Nissan USA   so its an A14

[tarekss123]

Also it seems that the changes in the OEM for the oversized rings are all uniform 12033-STD 12036 0.5 and 12038 1.00.That conclusion i reached by checking the size on the rings themselves and also online..I haven't seen any exception so far after checking about 200 sets.

 

Also online

 

 

https://www.liftpartswarehouse.com/product-p/ko12038-r9000.htm

 

 

https://www.amazon.com/PISTON-RING-SET-50MM-12036-R9000/dp/B018GIWJB0

 

https://www.amazon.com/PISTON-RING-SET-STD-12033-R9000/dp/B0171WXX2Q

 

doesnt matter whether for A14 the H20 , Z20, Ed33, Z24

 

Not a single exception thus far

 

 

[datzenmike]

How are the ring sizes checked? They are compressed to fit the bores so diameter will be much larger.

[datzenmike]

9 hours ago, tarekss123 said:

There is no discrepancy since all the numbers superseded are for an A14 from Nissan USA   so its an A14

 

If you say so, I just can't confirm this, that's all.

[tarekss123]

well its not me that said so

 

https://parts.nissanusa.com/p/89392271/12037-h8920.html

 

its NissanUSA that did...I am have no choice but to believe what's on their official website. 

[datzenmike]

Good enough.