Spun Rod Bearing Question. PLEASE HELP!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

silviakid2790 · 07-06-2008, 09:18 PM

so im pretty sure i spun a rod bearing in my sr. it drive fine and sounds fine at idle but if you pop the hood and pull the throttle cable you can hear a horrible noise around 3k but then it stops if you let it go back down to idle. i know there are different grades of rod bearings, i read something about you have to get the numbers off the crank that will tell you which ones to get but i was wondering if all s13 sr's are the same? if so do any of you guys know which grade i need to get? please help me out, im trying to get this fixed asap. thanks!

*wangan_cruiser* · 07-06-2008, 09:21 PM

Quote:

Originally Posted by silviakid2790

so im pretty sure i spun a rod bearing in my sr. it drive fine and sounds fine at idle but if you pop the hood and pull the throttle cable you can hear a horrible noise around 3k but then it stops if you let it go back down to idle. i know there are different grades of rod bearings, i read something about you have to get the numbers off the crank that will tell you which ones to get but i was wondering if all s13 sr's are the same? if so do any of you guys know which grade i need to get? please help me out, im trying to get this fixed asap. thanks!

ouch. where was the noise coming from? top or bottom

silviakid2790 · 07-06-2008, 09:34 PM

Quote:

Originally Posted by wangan_cruiser

ouch. where was the noise coming from? top or bottom

to be honest with you its pretty loud its hard to tell, but it sounds like its coming from the bottom

motonagam · 07-06-2008, 09:50 PM

Have you checked the oil level? I've had that done to me where it'd make a really bad noise when I rev it up, but quiets down when I let it idle. The oil level appeared to be ok, but later found out it had the wrong dipstick... the dipstick was too long, so it read ok on the stick, but it was actually LOW, like it only had half a quart in it. Drained the oil, and refilled it to the correct amount, scribed a new mark on the stick, and it's been ok ever since.

silviakid2790 · 07-06-2008, 10:09 PM

Quote:

Originally Posted by motonagam

Have you checked the oil level? I've had that done to me where it'd make a really bad noise when I rev it up, but quiets down when I let it idle. The oil level appeared to be ok, but later found out it had the wrong dipstick... the dipstick was too long, so it read ok on the stick, but it was actually LOW, like it only had half a quart in it. Drained the oil, and refilled it to the correct amount, scribed a new mark on the stick, and it's been ok ever since.

i know it has the correct oil level, i changed my oil like 3 days before i noticed it real bad.... went and got my old oil filter, had a few gold flakes in it....

Sileighty_85 · 07-06-2008, 10:10 PM

youp spun rod bearing
If it gets louder through the RPMS its a bearing

So first things first STOP RUNNING THE ENGINE!
the more you run it the more damage your causeing

pull the crank take it to a Machinest and he can tell you if the crank is still usuable

you maybe need to machine the crank if the crank is scared, so then you will have to get oversized bearings

the numbers are for the bearing sizes are for non fubar cranks so if the crank does not need to be Machined then you can use the formula to get new bearings the SR FSM has a step by step procedure on doing that

silviakid2790 · 07-06-2008, 10:50 PM

Quote:

Originally Posted by Sileighty_85

youp spun rod bearing
If it gets louder through the RPMS its a bearing

So first things first STOP RUNNING THE ENGINE!
the more you run it the more damage your causeing

pull the crank take it to a Machinest and he can tell you if the crank is still usuable

you maybe need to machine the crank if the crank is scared, so then you will have to get oversized bearings

the numbers are for the bearing sizes are for non fubar cranks so if the crank does not need to be Machined then you can use the formula to get new bearings the SR FSM has a step by step procedure on doing that

yea i havent driven it since i really noticed it but idk how long it has been like that.....

thank god i have a dd. looks like im gonna have to tear her apart soon

sxe · 07-06-2008, 11:17 PM

dont drive it!!! take your motor out, remove crank shaft, have them machine it, get bearings that fit the new machine sized crankshaft. whala, good as new, i had to do this idk how many times in my 96 gsx. dsm=crankwalk =/

silviakid2790 · 07-06-2008, 11:20 PM

i know this is a newb question but ive never done anything to the bottom end of a car at all. after they machine it all down how will i know what size bearings to get? and would it be cheaper to get it machined or just buy a used crank that isnt scared up?

sxe · 07-06-2008, 11:26 PM

depends on where you go, and the machine shop will tell you how much they machined down, they usually have bearing for you. depends on how bad it spun. if the crankshaft is really egg shaped, you might be better off buying a used crankshaft, but ive always had better luck having the machine shop take care of it, spinning a rod bearing in my cases were all oil starvation, what oil do you run, and how often do you change it? were you at high RPM's when this happened? when did you notice this vicious knock?

Sileighty_85 · 07-07-2008, 12:17 AM

Quote:

Originally Posted by sxe

dont drive it!!! take your motor out, remove crank shaft, have them machine it, get bearings that fit the new machine sized crankshaft. whala, good as new, i had to do this idk how many times in my 96 gsx. dsm=crankwalk =/

Wow is there an echo in here?

Quote:

Originally Posted by silviakid2790

i know this is a newb question but ive never done anything to the bottom end of a car at all. after they machine it all down how will i know what size bearings to get? and would it be cheaper to get it machined or just buy a used crank that isnt scared up?

well it depends on when the bearing spun, If at idle and and ran for a few mins then the crank migh be fine, You can probably get away with just polishing it.

hopefully its not bent if you ran it for a while, and not too fucked up seeing that your not sure when it spun

But if they have to machine the crank they will tell you how much and maybe able to tell you the appropriate bearing size. If not you'll have to plasti gauge the clearances.
Get that shit balanced while your at it too.

It will be cheaper to machine it, if you buy a used crank what not to say that one would be bent or jacked up either.

More than likely you need a new oil pump too.

sxe · 07-07-2008, 12:27 AM

nope no echo, this is a writin thread, there is no sound, therefor it is impossable to echo. i win 1-0.

Sileighty_85 · 07-07-2008, 12:44 AM

Quote:

Originally Posted by sxe

nope no echo, this is a writin thread, there is no sound, therefor it is impossable to echo. i win 1-0.

Lolz your funny Mr. Red Square Guy

P.S.
Its spelled Impossible

I win 10000000000-1

Game Over No need to thread jack this guys thread

projectRDM · 07-07-2008, 07:52 AM

The crank will more than likely need machining, requiring oversized bearings. The machine shop will know what to do for you. Just know that if you spun a main bearing the block itself cannot be machined, you'll need a new one.

silviakid2790 · 07-07-2008, 10:53 AM

Quote:

Originally Posted by sxe

what oil do you run, and how often do you change it? were you at high RPM's when this happened? when did you notice this vicious knock?

i used royal purple, a shop that a lot of my buddies work at said that may be my problem haha, i try to change it every 3-4k miles but sometimes its a little longer (but nothing outrageous) and to be honest i dont know when it happend because the car drives fine and sounds fine at idle, i had just finished installing my koyo and fal fans and for some reason i wanted to pull the throttle cable and rev it up but then i noticed it and shut her down....havent driven it since

this sucks, im probably screwed

silviakid2790 · 07-07-2008, 04:55 PM

any other thoughts or suggestions?

07-06-2008, 09:18 PM	#1
silviakid2790 BANNED Join Date: May 2007 Location: wake forest, nc Age: 31 Posts: 329 Trader Rating: (1) Feedback Score: 1 reviews	Spun Rod Bearing Question. PLEASE HELP!! so im pretty sure i spun a rod bearing in my sr. it drive fine and sounds fine at idle but if you pop the hood and pull the throttle cable you can hear a horrible noise around 3k but then it stops if you let it go back down to idle. i know there are different grades of rod bearings, i read something about you have to get the numbers off the crank that will tell you which ones to get but i was wondering if all s13 sr's are the same? if so do any of you guys know which grade i need to get? please help me out, im trying to get this fixed asap. thanks!

07-06-2008, 10:10 PM	#6
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	youp spun rod bearing If it gets louder through the RPMS its a bearing So first things first STOP RUNNING THE ENGINE! the more you run it the more damage your causeing pull the crank take it to a Machinest and he can tell you if the crank is still usuable you maybe need to machine the crank if the crank is scared, so then you will have to get oversized bearings the numbers are for the bearing sizes are for non fubar cranks so if the crank does not need to be Machined then you can use the formula to get new bearings the SR FSM has a step by step procedure on doing that __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

07-07-2008, 07:52 AM	#14
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 47 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	The crank will more than likely need machining, requiring oversized bearings. The machine shop will know what to do for you. Just know that if you spun a main bearing the block itself cannot be machined, you'll need a new one. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

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07-06-2008, 09:50 PM	#4
motonagam Leaky Injector Join Date: Jul 2004 Location: San Jose, CA Posts: 91 Trader Rating: (1) Feedback Score: 1 reviews	Have you checked the oil level? I've had that done to me where it'd make a really bad noise when I rev it up, but quiets down when I let it idle. The oil level appeared to be ok, but later found out it had the wrong dipstick... the dipstick was too long, so it read ok on the stick, but it was actually LOW, like it only had half a quart in it. Drained the oil, and refilled it to the correct amount, scribed a new mark on the stick, and it's been ok ever since.

07-06-2008, 11:17 PM	#8
sxe Zilvia Addict Join Date: Aug 2007 Location: in a house. CA Age: 32 Posts: 686 Trader Rating: (2) Feedback Score: 2 reviews	dont drive it!!! take your motor out, remove crank shaft, have them machine it, get bearings that fit the new machine sized crankshaft. whala, good as new, i had to do this idk how many times in my 96 gsx. dsm=crankwalk =/

07-06-2008, 11:20 PM	#9
silviakid2790 BANNED Join Date: May 2007 Location: wake forest, nc Age: 31 Posts: 329 Trader Rating: (1) Feedback Score: 1 reviews	i know this is a newb question but ive never done anything to the bottom end of a car at all. after they machine it all down how will i know what size bearings to get? and would it be cheaper to get it machined or just buy a used crank that isnt scared up?

07-06-2008, 11:26 PM	#10
sxe Zilvia Addict Join Date: Aug 2007 Location: in a house. CA Age: 32 Posts: 686 Trader Rating: (2) Feedback Score: 2 reviews	depends on where you go, and the machine shop will tell you how much they machined down, they usually have bearing for you. depends on how bad it spun. if the crankshaft is really egg shaped, you might be better off buying a used crankshaft, but ive always had better luck having the machine shop take care of it, spinning a rod bearing in my cases were all oil starvation, what oil do you run, and how often do you change it? were you at high RPM's when this happened? when did you notice this vicious knock?

07-07-2008, 12:27 AM	#12
sxe Zilvia Addict Join Date: Aug 2007 Location: in a house. CA Age: 32 Posts: 686 Trader Rating: (2) Feedback Score: 2 reviews	nope no echo, this is a writin thread, there is no sound, therefor it is impossable to echo. i win 1-0.

07-07-2008, 04:55 PM	#16
silviakid2790 BANNED Join Date: May 2007 Location: wake forest, nc Age: 31 Posts: 329 Trader Rating: (1) Feedback Score: 1 reviews	any other thoughts or suggestions?