Replacing Rod Bearings. Easy?
03-02-2009, 09:31 AM
#1
Replacing Rod Bearings. Easy?
well, i guess the stock motor didnt like the 7.5k redline with the conventional oil(oops) and now im getting a knock from one of my rear bank cylinders
.
So now im debating on doing another 3.5 swap or changing out the rod bearings.
My question is, could i just drop the oil pan, crankcase/upper oil pan and that cradle thing thats hold the crankshaft then just unbolt the connecting rods, push them up and remove/change the bearings?
OR
do i HAVE to drop the crankshaft out via removing all the timing assembly, tranny and flywheel?
I pretty much just wanna reach up in there and swap them out if possible.
Im also questioning this method because this is how my friend did it on his Taurus SHO
.So now im debating on doing another 3.5 swap or changing out the rod bearings.
My question is, could i just drop the oil pan, crankcase/upper oil pan and that cradle thing thats hold the crankshaft then just unbolt the connecting rods, push them up and remove/change the bearings?
OR
do i HAVE to drop the crankshaft out via removing all the timing assembly, tranny and flywheel?
I pretty much just wanna reach up in there and swap them out if possible.
Im also questioning this method because this is how my friend did it on his Taurus SHO
03-02-2009, 09:48 AM
#2
Believe it or not, you could set the cylinder you're working on at BDC and probably be able to push the connecting rod/piston up, but I dont know how much room you'll have with the crankshaft and counterweights in the way. If you take the caps off, you could actually shift the big end of the rod over and rotate the crank a little so the journal is over to one side, and the rod is on the next, put the bearing in, and rotate the crank, making sure the rod is out the way, seat the rod with bearing on the journal and repeat. On my next disassembly, maybe ill simulate the motor being in the car on the engine stand just to see how much clearance we'd have. In theory, I think if you're careful, it could be done and would save lots of time.
Thats the best pic I have at the moment.
Thats the best pic I have at the moment.
Last edited by TJ_Max; 03-02-2009 at 09:53 AM.
03-02-2009, 10:39 AM
#4
tat pic helps out ALOT!! i was looking for a picture just like that. the FSM has the etch-a-sketch drawing of one and doesnt help too much and i tossed my old 3.0's so i had nothing to look at for reference. Think ill try this tomorrow 
03-02-2009, 08:59 PM
#6
well guess ill just go buy another 3.5 and put some cosworth heads on it 
FYI, it only knocks at around 3k in up.. not bad at all yet but i dont drive it anymore.. 2.5k and below, dont hear a thing. Could this mean i just have to change the bearings and the crank pin might still be good?
03-02-2009, 10:44 PM
#7
Whats crazy about it all is you can drop the crank with the engine in the car, lol. More tricks to keep the pistons up, but woulda been a pretty cool experience if you ask me. I do agree with nismology in that, you cant just change a rod bearing, you have to correct what caused it to go bad in the first place,and then fix any damage that could be associated with the bearing issue. Doing things right is a **********.
03-02-2009, 10:48 PM
#8
Whats crazy about it all is you can drop the crank with the engine in the car, lol. More tricks to keep the pistons up, but woulda been a pretty cool experience if you ask me. I do agree with nismology in that, you cant just change a rod bearing, you have to correct what caused it to go bad in the first place,and then fix any damage that could be associated with the bearing issue. Doing things right is a **********.
..I still might drop the crankcase tomorrow and try it. Ill keep everyone updated to let them know the process
03-03-2009, 07:10 AM
#9
yea i agree and sadly to say, imma 1/2 a**ed kinda guy sometimes when it comes to things like that.. I honestly think the bearing might have just warped but owell... Ill set it aside and rebuild it later or something ..
I still might drop the crankcase tomorrow and try it. Ill keep everyone updated to let them know the process
..I still might drop the crankcase tomorrow and try it. Ill keep everyone updated to let them know the process
03-03-2009, 10:38 AM
#11
honestly dont think it was the nitrous, that could possibly mess up the valves but i think it was just engine heat too hot and conventional oil. had 150miles on a new oil change, drained it out and it had broken down into almost water like and was BURNT!.
I think i need a new radiator or something too because my idle temp is around 186-195*
I think i need a new radiator or something too because my idle temp is around 186-195*
03-03-2009, 06:04 PM
#13
I was thinking more like nitrous+7500rpms+stock rod bolts= knock knock
btw do not sand it, it'll mess it up and that rod will have very low oil psi and wipe out the bearing/crank journal to the point were the crank it too far out of wack and can be re-machined for over sized bearings
just replace the bearing baby the motor till you get a chance to rebuild or replace
btw do not sand it, it'll mess it up and that rod will have very low oil psi and wipe out the bearing/crank journal to the point were the crank it too far out of wack and can be re-machined for over sized bearings
just replace the bearing baby the motor till you get a chance to rebuild or replace
03-03-2009, 06:07 PM
#14
03-03-2009, 09:50 PM
#16
I was thinking more like nitrous+7500rpms+stock rod bolts= knock knock
btw do not sand it, it'll mess it up and that rod will have very low oil psi and wipe out the bearing/crank journal to the point were the crank it too far out of wack and can be re-machined for over sized bearings
just replace the bearing baby the motor till you get a chance to rebuild or replace
btw do not sand it, it'll mess it up and that rod will have very low oil psi and wipe out the bearing/crank journal to the point were the crank it too far out of wack and can be re-machined for over sized bearings
just replace the bearing baby the motor till you get a chance to rebuild or replace
and now that you & my father say that about the journals, im just gonna grab this other motor. cause it hard for me to baby a motor
loland full synthetic all the way now from now on
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