Crankshaft bearings!

[Stigmata]

Hey my crankshaft breaking went, meaning *not sure if thats what they are called * they are located under the oil pan you can see them there are a few of them belive 4, I was wondering if theres a guide on changing them

[DjPantsSpecR]

ha, most people's guide on changing main bearings is entitled: Buy a New Motor

more than likely you didnt spin a "crank" bearing, or main bearing, you spun a rod bearing. and even more likely than that is that you spun the number three rod bearing.

it's easy....

rip the motor out and flip it upside down

pull the front cover off and the rear main seal

unloosen the main crank bearing girdle in a few steps

pull that crank out

unloosen all the bearing caps from the rods and pull those too

now you have to consult your FSM to see the procedure on checking the grades for which bearings you need to order from nissan

or you can order whatever and then use plastigage to see if they actually fit....

if you honestly think you are just gonna replace one rod bearing its only like 12 bucks or less from Nissan, but since you are already in here you'll probably want all new main and rod bearings

i wanted this to be as simple as possible to trick you into doing it, i think most people would just buy a new motor

i bought a new motor, and then threw new bearings in it, and if the grades match i might even use some of the old bearings in the motor that i spun a rod bearing in.

When mine spun it welded itself to the rod, so you might need an extra one of those too....

[pregmantis]

usually when you spin a rod bearing, you screw up the crank journal. options will definitely change...sometimes you can fix the journal yourself but be expecting the worst

[kapower06]

not to hi-jack...but what about the number three rod bearing goin out? is the common? my motor knocks on cold start-up ( not timing chain) also anything after 2800 rpm it has a hollow knocking sound. I've listened to it with a stethiscope and it sound loudest right between the block and the transmission ( 5-speed with 190k mi) ive been told the it could either be the thrust bearing or possibly the pilot bearing... also there is a noticable loss of power once the sound strarts... can anyone help? thanks - Jake

[DjPantsSpecR]

ouch, number three rod bearing almost always spins.... nasty, like crud on a dildo

anywho, the noticable power loss is never a good thing to hear.... but with a spun bearing there is pretty muhc anoticable power loss everywhere



if this doesn't make you lose a hard on, i dont know what will.... and thats counting rosanne