integra3586

Ive been out of the game for some time now. I just picked up a 94 gsr as a beater. Well i believe i spun a rod bearing. Assuming I did, how feasible is it gonna be to just throw some new bearings in? Assuming the crank is fine, Is it possible to do it without removing the engine?

I realize i should plastigage, but i really want this to be as quick as possible, i dont plan to put a ton of miles on this. Is this possible?

Keep in mind this is just gonna be my daily beater


maybe some acl bearings? i hear those arent as precise...compared to honda parts

jasonp

you can change rod bearings without taking the engine out. but would really look at the crank and make sure there is no scaring...

integra3586

what happens if there is scaring and i ignore it? will they spin another bearing super fast?

integra3586

also is the b18b crank the same as the b18c crank?

mar778c

iTrader: (1)

Ok, here's the advice I give to anyone who spun a rod bearing. Your best bet is to replace the crank, rods, piston, and bearings ie the whole rotating assembly. The only thing you can kinda of reuse is the water and oil pump (if you rebuild it) but considering this is 94, you might want to replace that while you are at it.

Now to answer your question, yes you can replace a rod bearing without removing the engine. In this case, I would not advise it.

mar778c

iTrader: (1)

No, they are not the same.

mar778c

iTrader: (1)

Yes, it will spin again.

jasonp

everyone is right, but if you replace the bearings I would go with a thicker oil and not beat up the motor..

TorquelessEM1

What he said is correct.I had a friend just "slap" some rod bearings in his z6,against my advice.Low and behold,not even 50 miles later there were holes in the front of the block.......

integra3586

i appreciate all this advice...The reason for my question is only there because this is a beater, and i want to spend as little time and money as possible. I will with out a doubt try to just slap some new bearings in, If i blow the motor so be it. Then i will probably just put a SOHC POS cheap *** motor in it. I mainly got this for gas mileage anyways.

Now obviously if the crank is scored up pretty bad i will go a different route.

Is it possible to have a crank cleaned up? Maybe milled to a different size, then use different bearings?

TorquelessEM1

You can get the crank polished,but if its scored/burned to badly you maay be SOL.... Mar77 in this thread probably knows the service limits of the crank........

integra3586

ok, i just pulled the pan, this is what i found

The main Bearings look really bad! Is this where my knock is coming from?



This is the suspected Spun bearing, it was the only one with up and down play. The others had slight side to side, which im not sure is normal or not.



What will happen to the crank if i just leave to old bearings in?

Its not possible to change the main bearings in the car right?

jasonp

knocking would come more from rods not mains.. have you checked the rod bearings..?
also the grooves are from debris or rod bearing material..

integra3586

yea, the third and forth picture is from the number 4 rod. This was the only rod that had movement in it.

what will bad main bearings do?

jasonp

the pics. of the forth pic. doesn't look real bad but if you had movement then it's the bearing OR the rod has gone egg shape.. wouldn't know for sure unless you took the rod completely out of the block and had it checked.. as for the mains, they would be fine as long as the crank isn't scarred..

integra3586

sweet, ill just replace the rod bearings, then call it a day. hopefully it will last for a little while atleast.

Is side to side movement normal on the rods?

jasonp

side to side movement is normal..

mar778c

iTrader: (1)

Wow, it looks like pieces of the spun bearing where sucked into those mains.

non-VTEC

i would throw in a set of main and rod bearings and hope for the best.

hatchet_honda

if the b series blows youll swap in a SOHC? in a 94 gsr whaa?? lolz

92civiceg9gsr

Just replace all the bearings with the motor in the car. I did it to a buddy's daily driven GSR even though I really REALLY thought it was a BS way to freshen the motor. Since then he has put over 40k more miles on the motor, so idk. If you remove the oil pump and loosen the main caps one at a time. You can push/slide the bearing around the crank, and replace them. With the rods you can slide a rubber hose over the bolts so they dont score the crank. But keep in mind I would never do this to my own car.

HiProfile

I've seen that before, looked...odd. Still had vtec I've also seen pictures of a sohc teg with a junkyard turbo kit.

I got 2 gsr blocks for a steal, both had bad enough rod issues to hit the head. The one I just took apart had the rod journal ground away 0.1mm. Max out of round spec is .002" IIRC... It still had the bearing left, so I wondered if the filter got so plugged up that it bypassed itself.

While you can do the mains, if the crank is shot, they'll just spin again - soon. If you want to try it, first take off ALL accessory belts, and untension the timing belt. Next take all the mains off, centers first, then driver's side, then FW side. Be very carefull, and do not leave it supported like this for more than a few minutes. Your front & rear seals will be holding the ENTIRE weight of your crank, pulley, and flywheel/clutch. Push the outter mains through like mentioned above, then put those outter main caps loose, just enough to support the crank. Then do the inner mains, then snug the mains up. If you do the rods, get some thin hose (rubber, pvc, silicone) to cover the rod bolts like socks so they don't score the crank.

I did this on a sohc once because I had no time and...it was a sohc! Motor still works, but the crank had just been polished 1k miles previous and was w/in spec.


As far as play, you should have less than .0019" clearance for any bearing. That's not something you can feel.