luck4rmkc

iTrader: (2)

I am hoping some of you with machining experience that lurk the drag racing section can help answer a question of mine...

I have been led to believe through some research that because of the Honda B series oil pump setup being doweled into the block this can lead to oil pump alignment complications after a line hone or line bore of the main journals. The misalignment will lead to oil pump gear mesh issues/backlash and cause pump gear damage. The idea makes sense but I am looking for some real world experience from those of you that deal in machine work on the Honda B series regularly and have tackled a resolution to a line bore issue with success.

First, I know that after installing new sleeves in a block all manufacturers recommend a line hone to ensure there was no block shift during the process. If this is so then that tells me that a minor line hone may not cause any issues at all. This leads me to believe that it is only a line bore procedure that drastically changes the alignment of crank to oil pump that will cause an issue. Am I correct on that assumption? If I am correct how much is too much to bore or hone out?

Second, If you have a major line bore issue that is not something you can simply line hone removing 1-3 thou to correct what do you do in that scenario? Is the block really trash? If there is one thing I've learned it is where there is a will there is a way. So what is the way to save something in that scenario? Do you have to weld up the mains and then line hone back to factory spec (build it up/knock it down)?

Any and all responses are appreciated but just to clarify I am looking for responses from those of you with machining experience that have addressed this scenario personally with success or not.

gogetta

Any time you do any type of align bore you will have some type of misalignment weather it be major or minor will be solely based on the amount of material removed and who is doing the machining.
Not all sleeveing facilities have to align bore or recommend align boring their blocks. "Bensons is one of the few."
If you have a block where you are even considering adding material to the mains than you have already answered your own question.

luck4rmkc

iTrader: (2)

Still wondering what is considered major and what is considered minor... How many thousandths can you change the true centerline of the mains without having oil pump issues? Can anyone out there answer this question? I'm looking for those of you that have real experience with this. As I said before I understand the concept but there is no guide that I know of giving a spec of how much is the max you can line hone.

hybrid_KJ

I've heard of people that have line bored their blocks and then removed the oil pump dowels and used the crank to alingn the pump. Then you just have to use some RTV on the oil pump mating surface to ensure the oil pan gasket doesn't leak. This was not on a daily driver.

V-SPEC 1

What about the bolt holes, will they still line up with the pump?

hybrid_KJ

Yes all the bolt holes still lined up well enough.

luck4rmkc

iTrader: (2)

I had that thought as well. If you used a good amount of rtv on the pan sealing surface to make up the difference I suppose you could get away with it... Anyone else with experience on this issue?

cibao2ner

http://www.youtube.com/watch?v=JE7U5l_MoP8

skip to 8:10

swapit

I have had 3 done before and didnt take out the dowels on the pumps and havent had any oilpump issues at all.2 motors i used the prodrive oilpump gears and both made over 900.The other was a stock oilpump gear but is a street car dd and is still running today.I know my machinist hates when he needs to do it since its a alum. block with steel caps.

luck4rmkc

iTrader: (2)

Good vid that is a good tip about the feeler gauges and filing the dowels that jeff Evans knows his stuff!

So I am still wondering if you were to have to correct a major line bore issue what would be the correct way to address it?

PyroProblem

I wonder if the transmission input bearing is affected as well??

luck4rmkc

iTrader: (2)

^ good thought... And it would be tough to find a way to check it.

hybrid_KJ

Doesn't ERL also sell thicker main bearings so you can run the main bore larger and not offset the centerline at all? I thought that is how they did their K blocks or at least used to. Those K mains would fit a b block as well.

jasonALYK

iTrader: (1)

Not to be off topic, but i recently bought a main girdle for my lsvtec setup, from everything ive read, you should have the mains aline honed. What are some of your thoughts on this? Block has G.E. sleeves. Also should i use ls torque specs for the mains or gsr?

.adam.

use the torque specs that come with the arp studs retard ****stain

unusual71

No the clutch disk is attached to your input shaft and will have enough floating free play to not majorly transmit any load. That is assuming your center line only moved like .001" or less. Any good machinist who has done a honda block before should have no problem maintaining the center line to within .000X"

Bailey1

I'm pulling my hair out trying to find main bearing bore specs for a J35A5 3.5 Can anyone help?

PyroProblem

May I suggest starting a new thread? This is an older thread dealing with B series engines from a few years ago.

A fresh thread will generate new interest.
New thread , New topic, New Answers.

If you find the specs, be sure to post them. Might help the next guy in the same situation. Good Carma 😊

Bailey1

A member suggested I create a new thread with my question. I'm not sure how to do this or if I can as a trail user?

PyroProblem

If you are able to which I think you are, top left corner where it says" new post"