John,
I am sorry to hear of your engine/pushrods issues. There are a few
items to look at and check. We will assume that the rocker shafts were
properly cleaned with end caps removed and the shafts rodded and solvent rinsed
till all residue was removed.
Firstly, for proper oiling to the rockers & pushrods the banana grooves
in your rockers need to be facing “down.”
Have
you done a visual with a valve cover off to see if oil is emanating from the
shaft/rockers?
After
checking for evidence of proper rocker shaft orientation and “oil” distribution,
determine that the pushrods supplied in your rebuild are installed correctly
with the smaller 1/4” ball in the cup of the rocker arm – the larger 5/16” ball
goes into the hyd. lifter.
Subsequent
items to check;
See
if you can find the engine rebuild invoice for part numbers of your lifters,
pushrods, and if your cam was reground. Without “adjustable” rocker
assemblies you may have binding and pushrod breakage because of several factors;
incorrect
pushrod ball orientation,
incorrect
pushrod length (wrong pushrod or improper length of pushrod to account for head
milling/smaller lobe from reground cam/block decking & head gasket
thickness), or incorrect hyd. lifters – application should be Sealed Power HT812
(some older numbers are HT1812).
A
lack of sufficient oil will “blue” the metal/gall or incorrect pushrod/lifters
will heat and expand enough bind after warm-up/extended driving and cause
breakage over time.
Keep
us posted on what you find.
Sent: Wednesday, November 18, 2015 2:09 PM
Subject: [FWDLK] Rocker Shaft Installation in 1957 Dodge 325
Engine
Three years ago I had the 325 V8 engine of my 1957 Dodge
Custom Royal rebuilt. Since then, I have regularly been going through
pushrods at the rate of one every one to two months during the driving
season. It’s a problem I’ve never experienced before the rebuild.
I’m sure this is caused by improper oil distribution to the rocker arms, but
I’ve been unable to confirm it.
I need a foolproof way to ensure proper rocker shaft
installation so the oil gets to where it needs to be. Can anyone confirm
the correct orientation of the little arrow on each rocker shaft to ensure
proper installation? Any pictures of this that would be helpful?
Thanks for your help!
John Williams
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