hey guys i want to order new rod bearings but at nissan they need the model number and vin number before thay can order the parts. now i changed my engine dont know where it came from or what year model it is how can i find out what sort of rod bearings i need? :bow2:
Dont you have to get the grades of the crank and rods ie pull engine apart first ? http://www.conceptzperformance.com/Cart/description.php?II=1898&Car_Type=NIS300&UID=
nah i want to try just to change the bearings from the bottom of the car i pulled the oil sump, should be easy just dont know how its going to work? nah the bearing are differant thay have 5 differant ones just for 90 the model.
No they dont mate. different thicknesses maybe but the bearings themselves are the same. Just give em the engine code. VG30 DE or VG30 DETT So you think there are 5 different types of cranks and rods?
Nissan make the stock bearings in different grades to allow for minor machining differences in the factory. You need to consult the Workshop Manual to work out the correct bearing grades based on the numbers Nissan stamp into the crankshaft, con rods and block. Or alternatively, you can read the part numbers off the back of the old bearings.
Does that make it better? When Nissan was making these engines, they would machine a batch of hundreds of rods. There would be slight variations between the start of the batch and the end. When you get a set of rods closed and honed, the machine shop only working on a batch of 6 rods so it is relatively simple to ensure they are all correct. It's similar story with the crank grinding. You can just fit a set of Grade 0 bearings or after market bearings like ACL and you will probably have no problems. If you want the tolerances to be as Nissan designed, then you should use the graded bearings when you are replacing without machining.
Dont be condecending now, i didnt say it was better. just making hte point that its only OEM nissan who have different grades of "standard" bearings The problem with graded bearings is that if you use the ones that are in there and your crank has worn even a quarter of a thou on the radius then you might be better off going up a grade anyway and you wont know that untill you install the bearings, crush them and measure. Also you say fine tolerances that nissan specify. have you seen what the service manual classifies as within tolerance. i cant remember the exact figures but it is quite a variation. In addition to all this, if the motor has been rebuilt already or is from another car going off the vin number or engine number may be pointless too. I use ACL bearings, standard, flexi gauge them after installation and check against service manual.
yeah i changed the engine and dont know whats been done to it? i got some bearings from beenleigh bearings ill see tomorro if thay will fit?
physically they will fit but you need to check the bearing clearance after installation. use flexi-gauge. Google the procedure if you need to. good sig pic too by the way
thanx i put it all together sounds ok at the moment + taped out the oils sump dint much better oil pressure. the bearing are same as the rb30 skyline. thanx for the help!!!
