Help!rb26 Crankshaft Old And New Style?

[ck_chino]

doing my t belt and just pulled off seal for cams and crankshaft. just want to confirm if i have either the old or new style crankshaft, can barely see the oil drive(flats which engage the oil gear) the flats DO NOT extend beyond the oil gear, they are below the surface of the gear approx 3mm or 1/8 of an inch. however i have determined the width of the portion which contacts the seal is about 12 mm wide. i am not talking about the flats but the part of the crank which rides against the seal. obviosuly the smaller the width of the portion that rides on the seal the better because it yields a wider width for the flats which contact the oil gear. so my question is on the attached url there is a a diagram of the new and old style cranks shafts. distance "a" is representing the new and "b" is the old one.

i am hoping i have "a" crankshaft so can anyone pls kindly confirm that the dimension of width is is about 12mm or 13mm?????crank pics

[Moodles2]

Profile mentions 94 BNR32, so you should have the R33 crank. The flat part on R33 (ie. where the pump is driven by) should be twice the width of the early R32 crank..

Late 32/33 (good) vs. Early 32 (bad)

[ck_chino]

hey thanks for the reply however i believe my manufacturing date is in 93 so im not sure if i made it for the cut off

and who knows if the engine has been swaped or not but just saying u have to exprect the worst

but can anyone provide me with an exact measurement? ie give me the width of "a" or "b" which is in url of the first post???????????????

how wide is the part of the crank which rides on the seal? not the flats of the oil drive

Profile mentions 94 BNR32, so you should have the R33 crank. The flat part on R33 (ie. where the pump is driven by) should be twice the width of the early R32 crank..

Late 32/33 (good) vs. Early 32 (bad)

Edited September 17, 2009 by ck_chino

[Duncan]

can't really tell until you have the oil pump off. once you do those pics will make it immediately clear. unfortunately you have to pull the sump off and crank out to find out

[Lived4eva]

I am in exactly the same boat. I removed the front crank oil seal and thought I would be able to see the type of crank my car had. Just like you it told me very little even when sticking my head in there and taking photos. However I found from looking at the photos by sticking a small jewelers screwdriver into where the seal use to be you can see how deep the screwdriver goes before it hits the second lip of the crank. From the photos you can see that the older style crank would go deeper than the newer type.

I put the screwdriver in, marked how deep it went and measured it against the stroker crank I have. I found them to be the same. Thus I have the newer style.

Screwdriver should only go in about 12mm if it is the newer crank. If it substantially more than 12mm it is most likely the older style crank. Hope the photos attached help explain. I don't have access to an older style crank so I can't give any exact measurements however at a guess it would be 20mm+.