URGENT-Bearing clearences help from 455 guru's

[396_WAYS_TO_SPIT]

I am puting my motor back together tomorrow and I need the clearences for the mains and rods. A local guy told me (.0025-.0035 mains) and (.0010-.0015 on rods). Do these numbes sound right? I really need this help asap so I can get my block done tomorrow. What clearences have you guys ran in the past with good success? I want my bottom end to stay together so I want to do it girht.
Thanks,396

[malcolm]

Well, it's gonna be whatever it's gonna be, just check it and see what it is and go from there. Those mains sound about right, I think those rod clearances sound a little tight though. More like .002

[wfodude]

I agree with malcom....002 on the rods.. I prefer 003 on the mains. but as he said its gonna be what it is... you dont have a lot of choice other than have the crank polished down if its too tight or close the housing bore down EVER sooooooooo slightly if its too loose AND your housing is a tad big but thats a whole nuther can of worms.

[wfodude]

oops forgot the most important thing. In an olds you want plenty of oil volume and the main restrictors that mondello sells...455's will live and live well if done properly. Good luck and keep it clean when goin together

[Omega21]

396-
I posted the 73 Olds/Mondello specs for you on Banderlog.
Todd

[396_WAYS_TO_SPIT]

Omega21:
396-
I posted the 73 Olds/Mondello specs for you on Banderlog.
Todd Todd, could you please post it here......I cant get banderlog to load up.
396

[396_WAYS_TO_SPIT]

So .003 on the mains exact? i am new at this. My dad said to keep it loose because its a boat. Is he right? How loose is too loose?
396

[malcolm]

I sure wouldn't want it any looser than that!

[Omega21]

According to the almighty Mondollar technical reference book & 1973 Oldsmobile specs:
#'s 1,2,3 & 4: .0005-.0021
#5:.0020-.0034
Rod:.0004-.0033
Side clearance:.002-.013
Todd

[kcils1]

If that's your tail.It is pretty impressive!

[Hal]

If you have to much clearance you can buy undersized bearings to get your clearances in spec.
[ February 23, 2003, 07:08 AM: Message edited by: Hal ]

[malcolm]

OK 396, what'd you end up with?
Kcils1, yep, that's me.

[396_WAYS_TO_SPIT]

[QUOTE]Originally posted by malcolm:
[QB] OK 396, what'd you end up with?
i am leaving right now to go to the shop. I will post my results when I get home.
396

[396_WAYS_TO_SPIT]

Ok heres the deal.......I am mad a F**K :mad: burningm I checked it and all the mains read
#1 Little under.001
#2 Little under .001
#3 Little over .001
#4 Little over .001
#5 Exactly .0015
When we put the crank in we couldnt even turn in :mad: It scored the bearings also :mad:
Should I have them check the line bore? What should I do besides grab the guy and slap the $hit out of him. I will going to the machine shop tomorrow morning.
396_Ways_To_Grab_His_Machineist :mad: :mad:

[wfodude]

Mic the crank first....I assume the housing bores are spotless....otherwise he needs to remove a RCH from that crank I have never seen an olds off on line but it is a good idea to check.....What do you mean by scored the bearing?

[malcolm]

Was the crank turned? What size?
I've never seen a turned crank that was that tight. Yeah what he said, mike it out. Are you using green plastiguage?

[SSTSleakcraft]

Take the block and bearings to the machine shop. Assuming your housing bores are in alignment and correct diameter, torque the caps with bearings in and get a measurement with a bore mic.. Have crank polished to .0025 front four, .003 rear, .002 on rods. Resrictors between main and cam bearings are a must. No highvolume without a big pan. Stock pump with Mondello spring kit will help. Having housing bores on the low side of spec before setting up clearances is best. My .02

[396_WAYS_TO_SPIT]

malcolm:
Was the crank turned? What size?
I've never seen a turned crank that was that tight. Yeah what he said, mike it out. Are you using green plastiguage? The crank was turned to 20-mains,10-rods
I am using green plastigauge
I will let you guys know more detail in the morning as soon as I get back from the crank shop.
396

[THE BOSTON SIDEWINDER]

I JUST BOUGHT A MELLING HIGH VOLUME OIL PUMP FOR MY 14 QT CAST OIL PAN SWAP, AND WAS WONDERING IF I SHOULD DO ANY MODS TO THE PUMP BEFORE INSTALLING IN MY MILD BB CHEVY(SPRINGS, BLUE PRINT) I ALSO BOUGHT THE BILLET PUMP SHAFT TO TRY TO KEEP ANY FLEXING TO A MINIMUM, ANY THOUGHTS?...BILL.

[AZKC]

This is a link to Infomaniacs engine building thread at HB's site. Its has a good section on oil pumps....
http://www.havasubarney.com/cgi-bin/ikonboard.pl?act=SF;f=25
KC

[396_WAYS_TO_SPIT]

I took the crank back and I had the guy mic it and he shook his head. the cranks came out to 18 not 20. He has to send it back to the guy that turns them for him. I made him check the line bore and its good as new. Hopefully I will be building this weekend. I will keep you guys posted. Thanks for the help,Michael

[malcolm]

I hope that guy is good at recentering that crank. I had a BBC crank one time that needed about .002 taken off one side of the last rod journal. I was already disapointed that my crank was .030 under. It came back .040 under on the last journal, I was hot!

[396_WAYS_TO_SPIT]

I hope he is too because I will plant my foot in his ass :D All of them are at 18. It should be easier for him.
396

[Infomaniac]

Better wait until he is done before you plant your foot in his ass.
He might plant his foot in your crank.
[ February 24, 2003, 07:59 PM: Message edited by: Infomaniac ]

[Fiat48]

You guys take this for what it is worth. First, I'd be real nervous about a guy who turned a crank .018 instead of .020. Second, my crank guy says he cannot accurately take .002 off. I'd be looking for another crank.

[wfodude]

I agree with fiat....that sloppy would scare me....You might consider another grinder taking just the mains down 1 size unless youre at like 40 under now...And I have taken .002 of a crank that some local monkey ground... it took about an hour of setup with a very expensive dial indicator but we saved the crank...

[Infomaniac]

I was wonering about that also.
How about some special bearings instead? Maybe the King race bearings with a little extra clearance?
Also I did not speak up about the rod clearance. Those engines are bad about spinning the rod bearings on a fresh rebuild. I would agree with the loose rod clearance. Loose mains also if the crank is cast rather than forged.

[Fiat48]

I wouldn't think it would be hard to come up with another 455 crank as I gather this is just a stocker type crank anyway.
Infomaniac: Good idea..Kings Race bearings been giving me an extra .001 over Federal's. Maybe a .001 extra clearance main bearing from King might do it. But that work done like that, that bugs me! And I wonder about the rods, too. I'd turn the crank in for core value and buy a kit crank from a rebuilder.