im using the mondello oil restrictors in the 3 main saddles of my 403. I did not however use locktight before i installed them. I also elongated the main bearing holes. DO i really need to worry about them falling out? The engine is already together.

 

Where do you think they're going to go? The absolute worst thing that could happen is that they slide down to the backside of the main bearing shells. So what? They can't fall out.

The only danger is to your wallet for buying "restrictors" that don't really restrict anything...

 

Yes but i drilled out the main bearing holes so couldnt it possibly fall out?

 

i looked at the holes and they are drilled out enough where if the restrictor did fall out it would not be stopped by the bearing shell.

 

"The only danger is to your wallet for buying "restrictors" that don't really restrict anything..."

Joe, I take it you don't think the restrictors are a worth while expense... please explain?

 

Can someone please answer the original question?

 

Sre the threaded or driven in? What does Mondello have to say about this issue

 

Oil pressure will hold them in place.


Resulting in a restriction at his oversize hole in the bearing?


From the Mondello Technical Manual, Volume 1

He, and a lot of others.

https://classicoldsmobile.com/forums...tml#post171389


Norm

 

If you didn't put one in the first hole then I wouldn't sweat it too much. if that one slips down then it will block the passage to the driver side lifter oil galley I believe. Then you have a problem.

 

If i do decide to take them out can i do so by lifting of the crank? the pistons are already installed

 

To answer your question: You would have to remove the crank and bearings, in order to to gain access to the restrictors. If you used a hammer to install them, you will need a hammer to remove them.

To give you some advice: If you used a hammer to install them, they will not fall out.

Norm

 

do i just use a punch to push the restrictors down and out the cam bearing hole toward the top of the block or what? WIll my oversized holes in the main bearings be ok without the restrictors or should i get new bearings? I thought the restrictors help to keep more oil on the crank

 

Fresh, pressurized oil comes from the passenger side lifter galley, through an angled-drilled hole in the block to the main bearing saddle, on the back side of the bearing.
Make sure the restrictor does not block other angled holes at the juncture.
The restrictor is only to hold back oil going straight up to the cam bearing.
I like the hole at the main bearing to be larger than the hole to the cam.
Many main bearings now available, do not match the oiling hole correctly in the block saddle.
This mis-match causes an oiling issue (restriction) at the main bearing. NOT GOOD.
Opening the main bearing hole only does good things for the crankshaft.
If you have already opened them up, leave them that way.
My opinion
Jim

 

my choice is either remove restrictors or install new main bearings. How do i go about removing the restrictors?

 

ok because thats what i did. I opened up the hole enough so the entire cam hole was exposed but if i keep it that way i would like to remove the oil restrictor because if for some reason it does slide out the bearing shell will not stop it.

 

From my understanding with Joe Mondello restrictors process was not just putting restrictors in 2,3,4 mains is 1/2 of the job. For the bearings to benefit from the restrictors, the lower bearing shells Journals 2, 3 and 4 should be opened up with 5/16 drill, then elongated, toward the center of oil hole restrictor with regular round rat-tail file. End of groove must line up with center of restrictor hole.The Bearing will now receive full benefit of extra oil remaining downstairs, thanks to the restrictor plugs. This is according to The master of Oldsmobile engines. Joe Mondello himself.

 

And yet, a review of the oiling diagram shows that all the restrictors do is reduce oil to the cam bearings.

 

I am a believer, shifting at 8500 rpm with a bb olds with no problem on bearing wear. Would of it been the same without??? Ill never know.

 

^^^^^^^