TERRIBLE OIL FAILURE ( WE GOT A WINNER!!! ) becomed on pushrod lenght discussion

[BSB67]

For those of you who have not used the PRW rockers, look at page 2 of this thread, reply #47. There Nacho has given us some close up pictures of the rocker arms. Look at the top two pictures of the left bank, i.e. cylinders 1, 3, 5, & 7. Notice that the #1 intake rocker has the ball cup slightly protruding from the rocker arm and NO threads are showing. This is approximately what the rocker arm assembly will look like when it is ready to be checked for proper pushrod length. #1 exhaust and #3 intake are what they should look like when the adjuster is screwed all the way into the rocker body. If the adjuster screw looks like #1 intake and the adjuster screw is turned all the way up, SOMETHING IS WRONG with the rocker arm and adjusting screw. I get a couple of rocker arms that look like that each time I get a PRW set. Sometimes you can run a tap through the rocker body and that will fix the problem. If it doesn't, I get a replacement rocker arm. 

This is what I said in post 43
"2) I believe that those rocker push rod cups oil through the body of the rocker.  There is a small groove on the adjuster that needs to line up with the oil feed hole in the rocker body, so having the correct push rod length is very important.  If the PR is too short, it might physically work, but the PR cup wont get oil"

[Nacho-RT74]

ok, when I assemblied I got all the adjusters fully threated out to begin with that as far was posible to set them like working with stock stamped rockers... all where reached to the top. It looks the adjusters got somekind of top limit somewhere but they are diff from one to the other

[Nacho-RT74]

the making of a homemade pushrod lenght checker 

the short section can be threated out around 5 mms and threated in around 15 mms. Enough for this check.

locking nut will be maybe a little bit deep into the head, but I think won't be a problem. I will be able to handle it somehow. Doesn't need to be TIIIGHTENED a lot, just by the touch

[Nacho-RT74]

ok, here is what you mention about the grove and hole on rocker and adjuster.

need to note that it looks to me when adjuster is fully threated out, the second line of threads ( above the groove ) its not in fact threated into the rocker... or is BARELLY threated in

[Nacho-RT74]

and here is the diff I got againts the stock pushrod when setting the homemade pushrod lenght checker after give two full turns to the adjuster, without preload, just setting it without play between rocker and lifter:

HONESTLY... the 2 mms diff is about the same what the adjuster gave me giving two full turns to the adjuster. So I can stablish really one turn is around 1 mm

AND... stock pushrods at this moment are not actually really with preload ( with lobes down ), I can spin them. Maybe because Lifters are not with full pressure being engine has been off all day long. I just cranked engine with a wrench to get lobes down on places I checked

I checked diff pushrods locations, and got small diff like half of turn between some of them

my homemade checker its at this moment 21.5 cms ( thats around 8.464" ), and the stock pushrods I have measures around 21.73 cms ( thats around 8.555" )

Being each turn at adjuster gave me around 1 mm change, I can order in fact 21.6 mms pushrods ( 8.5" ) ?.
if so... DAMN!!! ALL THIS HASSLE FOR MAYBE JUST .055" ?... thats something the lifter takes!

Maybe 2.55 mms ( 8.484" )?

opinions ?

Note:
Take in mind that maybe in couple of months will be removing the engine, tranny and everything ( I will be making a full body and paint job including engine bay again ) and maybe will send the engine to get CORRECTLY square the deck ( remember I have around 0.013-15 diff on deck height between front and rear )

[Nacho-RT74]

[Nacho-RT74]

One idea what was suggested by the Smith Brothers Pushrods vendor is he can send me the pushrods with one end not pressed in yet and cut as my needs to then press in the ball end.

But I'm afraid about get the job done correctly when making the press in job without damage anything 

[Nacho-RT74]

To get it centered, you back the adjusting screw all the way into the rocker body and turn it out ONE turn. It gives you one turn up and one turn down of adjustment. Not one single thread will show below the rocker arm. Even if you turn it down two turns NO threads will be showing! Pushrod length on RHS (AH, not RHS, PRW is what I ment) rockers must be very precise to get the full oil flow to the pushrod.

Turn it down one turn from fully backed into the body all the way, check the length precisely with a pushrod length checker, measure that length, add to that length the amount of preload you want and order a pushrod that long.

one turn should make around .040 to 0.50 diff ( around one milimeter ) as I have checked...

[nvrbdn]

hey nacho, i sure wish i was all about this stuff so i could get into this conversation with you, but im not. i just hate seeing you have to keep a conversation going by yourself. on another note, id be scared to death to cut my own lengths. mabey a machine shop could handle this and keep it all uniform.

[Nacho-RT74]

I'm not scared about cut, I'm scared about press fit correctly without the correct tooling and without damage it

[71green go]

I thought stock length Pushrods for a 440 were 9.30? or 9.20?.......that would be a huge difference in length

[heyoldguy]

What is the diameter of the pushrod that you are holding and what is the radius of the ball ball ends that you have manufactured? There appears to be a large difference.

Mancini Racing has a pushrod assembly tool part number MRE351310 $109.95. You can look at their website in the "tools" section to see what it looks like.

[justcruisin]

PRW make ball ball push rods in various lengths, they are oil through, either 5/16" or 3/8". I'm using them in mine, just measure what you need and order them to size, I think they increase in length by .050" intervals. Just double check your needed length.

[FLG]

Thats a 400 not a 440

[b5blue]

FYI, B - 8.57"and RB - 9.32" length. Hydraulic tappets have approximately .180" adjustment total. The last .10" is not "usable", tolerances can take .30", leaving .50" up or down on a new engine. Finding "free lash" requires draining lifter to fully compress it then measuring. (Per Mopar Performance B-RB book, page 190.)

[71green go]

Thats a 400 not a 440

DOH.......Sorry forgot he has a 400, I will go back to reading along as I am facing the same Pushrod dilemma on my 440
Thanks
steve

[Nacho-RT74]

order placed!

Smith Brothers pushrods

8.5", 3/8 pushrod with 5/16 ball/ball config, .049" walls.

Got it cheaper that has been told initially!

That gives me around 1.3/1.5 mms ( .050-0.57" ) shorter than stock, so then clearence to play with adjuster, then the preload

[71green go]

How much were they Nacho?.......If you dont mind
steve

[Nacho-RT74]

$6.5 each, plus shipping. Dunno why quoted me initially $8 each, and now $6.5

[Nacho-RT74]

What is the diameter of the pushrod that you are holding and what is the radius of the ball ball ends that you have manufactured? There appears to be a large difference.

Mancini Racing has a pushrod assembly tool part number MRE351310 $109.95. You can look at their website in the "tools" section to see what it looks like.

yes there is a small diff but not that much to worry about.

I saw the tool, but I won't buy a tool like that just for one use.

[elacruze]

I'm a little concerned, if your deck is lower on one end, your pushrod length will be different from front to back, too. Did you check each one separately?

[Nacho-RT74]

yes... of course got a small difference, but nothing to worry really. Block will be squared soon anyway.

I can't make diff pieces for that, just adjust the rockers propperly to each need.

[elacruze]

yes... of course got a small difference, but nothing to worry really. Block will be squared soon anyway.

I can't make diff pieces for that, just adjust the rockers propperly to each need.

Right, duh.

[71green go]

Nacho...did you get the new pushrods installed?.......any pictures of them installed.......how does motor run?

[Nacho-RT74]

they should be in hands in a week and a half. They are leaving Florida by air today where were storaged by a month and a half or so...