470 crankshaft installation questions

natemoore

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I checked my bearing clearances. All were within specs.:)

Here are a few questions:

When checking crankshaft endplay at the thrust bearing, should one shove the crankshaft to one side so that there is zero gap on one side of the thrust bearing, then measure the endplay at the other side? Manual was a little unclear, so this is how I measured it. If this is correct, then my endplay is withing specs.

Does it matter how the endplay is distributed between the front side and the back side of the thrust bearing? Seems like the crank will float back and forth, so I guess it doesn't matter.

As far as I can tell with a .002 feeler gauge and my own eyes, the faces of the two halves of the thrust bearing appear to be flush. I did the pry forward/pry aft thing on the crankshaft per the manual. Anything else?

Do you guys put Loctite on the cranks and rod bearing bolts? Manual didn't say to, so I didn't, but I was just wondering.

Bondo, I saw a post on another forum by "Bondo" who said that Permatex #2 was a good substitute for Perfect Seal. Was that you? How about Permatex #3 Aviation Liquid Form-a-Gasket? Does this stuff remain sticky or will it eventually harden?

I know that sealing the rear main bearing is critical to avoid oil leaks. Any pointers other than what's in the manual?

I got out of the machine shop for $400. Turns out that "seven angle" valve job this head was supposed to have had recently was non-existent, so that had to be added to my total. My machinist said the seller was full of it. Typical. :mad:
 
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Bondo

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Re: 470 crankcase installation questions

Re: 470 crankcase installation questions

Bondo, I saw a post on another forum by "Bondo" who said that Permatex #2 was a good substitute for Perfect Seal. Was that you? How about Permatex #3 Aviation Liquid Form-a-Gasket? Does this stuff remain sticky or will it eventually harden?

Ayuh,... #2 is a Paste,...
I've never been a fan of the Liquids,... Some of 'em turn as hard as Nails....
 

Don S

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Re: 470 crankcase installation questions

Re: 470 crankcase installation questions

#3 is non hardening. About the same thing as Merc Perfect Seal. It's just a gasket sealer.

http://www.permatex.com/products/Au...tex_Aviation_Form-A-Gasket_No_3_Sealant_a.htm

Do you guys put Loctite on the cranks and rod bearing bolts? Manual didn't say to, so I didn't, but I was just wondering.

Follow the manual. they do not get Loctite.

Turns out that "seven angle" valve job this head was supposed to have had recently was non-existent, so that had to be added to my total. My machinist said the seller was full of it. Typical.

Only 2 angles are required by Merc specs. I usually go 3. But why 7? You aren't building a super high rpm race engine. Without all the porting and polishing, the only thing you gained was the knowledge you gave more money to your machinest than necessary.
 

natemoore

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Re: 470 crankcase installation questions

Re: 470 crankcase installation questions

Only 2 angles are required by Merc specs. I usually go 3. But why 7? You aren't building a super high rpm race engine. Without all the porting and polishing, the only thing you gained was the knowledge you gave more money to your machinest than necessary.

No,no. The guy who I bought the used cylinder head from told me that. He said it had been rebuilt recently with a "7 angle" valve job (which was meaningless information to me). My point was that he was BS-ing me.
 

natemoore

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Re: 470 crankcase installation questions

Re: 470 crankcase installation questions

I meant crankshaft installation questions.:rolleyes:
 

Don S

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Re: 470 crankcase installation questions

Re: 470 crankcase installation questions

Fixed the title.
 

dr_bowtie

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Re: 470 crankshaft installation questions

for the thrust surface if you check it with a feeler gauge then yes you should move it to one side...or set up a Dial-Indicator on the flange and check it that way as well...

I have done so many engine I dont check this anymore...I just use a larger screw driver/pry bar and move the crank back and forth do get my desired pre-load on the thrust surface...

as far as the crank seal I ALWAY install teh seal so that a 1/4in is hanging out and dab Black RTV on both ends and do the same with the cap...I install the seal so the parting lines are rotated from the parting lines of the caps...

in 25years I have never had a main seal leak with this method....
 

gettin'even

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Re: 470 crankshaft installation questions

for the thrust surface if you check it with a feeler gauge then yes you should move it to one side...or set up a Dial-Indicator on the flange and check it that way as well...

I have done so many engine I dont check this anymore...I just use a larger screw driver/pry bar and move the crank back and forth do get my desired pre-load on the thrust surface...

as far as the crank seal I ALWAY install teh seal so that a 1/4in is hanging out and dab Black RTV on both ends and do the same with the cap...I install the seal so the parting lines are rotated from the parting lines of the caps...

in 25years I have never had a main seal leak with this method....[/QUOTE
]


The 470 has a one-piece rear main seal. Pretty trick for the time period it was designed in (70's)
 

dr_bowtie

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Re: 470 crankshaft installation questions

eh sorry bout that one...did even think to ask if it was 1-piece or 2-piece seal....disregard that post...:)
 

gettin'even

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Re: 470 crankshaft installation questions

eh sorry bout that one...did even think to ask if it was 1-piece or 2-piece seal....disregard that post...:)


It's all good. Ya tend to think in terms of whats familiar to you. I have worked mostly on 5.0 Fords, which have a one piecer. To me, I tend to think one piece rear main first.
 

natemoore

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Re: 470 crankshaft installation questions

eh sorry bout that one...did even think to ask if it was 1-piece or 2-piece seal....disregard that post...:)

I'm thinking to myself, what the heck is this guy talking about?:confused:

You were all whamp whah whah whamp whah whah whah there for a few sentences.:D
 

gettin'even

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Re: 470 crankshaft installation questions

I'm thinking to myself, what the heck is this guy talking about?:confused:

You were all whamp whah whah whamp whah whah whah there for a few sentences.:D


lol... Ever see a two piece rope style rear main seal....Talk about WTF!
 
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