273 rocker arm adjustment
ok this is what i came up with, double check my procedure
#1 fill the top hole of the rocker arm using brazing material. (many different methods, just avoid putting to much heat into the rocker arm)
#2 using the two existing holes in the valve lash adjuster threaded bore as a guide, drill through to the other side of the rocker using a .100" drill bit, #38 drill bit. This will put a hole under the rocker arm tip, which will shoot oil out onto the top of the valve stem/rocker tip. At this point there will be three holes in the rocker. Later on we will plug the outside hole of the valve lash adjuster threaded bore using a drill, tap, and set screw with lock tite.
#3 need to locate the rockers laterally on the rocker shafts. Center rocker on each valve tip on rocker shafts using additional shims. .015" per pair of rockers. so the order goes like this: rocker shaft clamp with bolt, then a gap, then a rocker arm, gap, stock rocker arm spacer, gap, rocker arm, gap, clamp with bolt. so those four gaps need to add up to .015", in which ever order is necessary to get the rocker arm tips centered on the valve tips. set it up with best judgement, and then put some dykem on the valve tips, rotate the engine and check the pattern. once all the patterns are good, make a diagram of how to put it back together.
#4 solder shut the existing one hole in the rocker shafts, polish, and then paint dykem on the shafts lengthwise on each side (where the 2 holes in the rocker arms are). re assemble using the diagram made in step 3 without push rods. hold the rocker tips on the top of the valve tip, this represents being on the base circle of the cam where there is no load on rocker arm from the valve springs. this will allow the oil to rush in when there is no load (larger gaps). While holding the rocker arm onto the valve tip, stick a thin scribe with a straight shank on the end and scribe a little circle in the dye on the shaft, and then on the spring side do the same thing but you will need to use a 90 degree scribe because the spring is in the way, through the hole in the rocker arm that we drilled underneath the rocker tip. Mark all 8 rockers (total of 16 holes), take the assembly apart, remove the rockers from the shafts and drill them with a #38 drill bit, the hole towards the bottom, add the banana groove, de bur, berry hole and polish everything. Also now we can drill tap and plug that outer hole in the rocker arm with a set screw and loctite.
#5 for the final assemebly adjust everything side to side till the holes line up before you evenly tighten/torque the 5 hold down bolts. Set the valve lash cold with no lube, then take them all part and lube everything up, then double check the side to side clearance.
here are the items that i am going to buy:
rocker arm shaft side shim kit (i think i need to get two sets?):
Amazon.com: Mopar Performance P3690896 SPACER PACKAGE: Automotive
the locking adjusters:
Amazon.com: Crane 99802-16 Shaft Rocker Arm Adjusting Screw - Pack of 16: Automotive
This is the end mill im going to use at work to mill the top of the rocker arms for the locking adjuster nuts. I can use the threaded bore for the valve lash adjuster, to bolt it perfectly to the milling machine table, then bring the end mill down to the top and just touch it until it has removed enough metal to be true.:
https://www.amazon.com/gp/product/B004KA99PI/?tag=joeychgo-20
number #38 drill bit:
Century Drill and Tool 11438 Wire Gauge Drill Bit, NO 38 - Jobber Drill Bits - Amazon.com
blue dykem:
Dykem 80300 Steel Blue Layout Fluid, Brush-in-Cap (4oz): Amazon.com: Industrial & Scientific
Adjustable push rod for measuring the custom push rods:
https://www.amazon.com/gp/product/B001G9HWCI/?tag=joeychgo-20
Picture attached:
wow that was a keyboard full, howd i do?
ok this is what i came up with, double check my procedure
#1 fill the top hole of the rocker arm using brazing material. (many different methods, just avoid putting to much heat into the rocker arm)
#2 using the two existing holes in the valve lash adjuster threaded bore as a guide, drill through to the other side of the rocker using a .100" drill bit, #38 drill bit. This will put a hole under the rocker arm tip, which will shoot oil out onto the top of the valve stem/rocker tip. At this point there will be three holes in the rocker. Later on we will plug the outside hole of the valve lash adjuster threaded bore using a drill, tap, and set screw with lock tite.
#3 need to locate the rockers laterally on the rocker shafts. Center rocker on each valve tip on rocker shafts using additional shims. .015" per pair of rockers. so the order goes like this: rocker shaft clamp with bolt, then a gap, then a rocker arm, gap, stock rocker arm spacer, gap, rocker arm, gap, clamp with bolt. so those four gaps need to add up to .015", in which ever order is necessary to get the rocker arm tips centered on the valve tips. set it up with best judgement, and then put some dykem on the valve tips, rotate the engine and check the pattern. once all the patterns are good, make a diagram of how to put it back together.
#4 solder shut the existing one hole in the rocker shafts, polish, and then paint dykem on the shafts lengthwise on each side (where the 2 holes in the rocker arms are). re assemble using the diagram made in step 3 without push rods. hold the rocker tips on the top of the valve tip, this represents being on the base circle of the cam where there is no load on rocker arm from the valve springs. this will allow the oil to rush in when there is no load (larger gaps). While holding the rocker arm onto the valve tip, stick a thin scribe with a straight shank on the end and scribe a little circle in the dye on the shaft, and then on the spring side do the same thing but you will need to use a 90 degree scribe because the spring is in the way, through the hole in the rocker arm that we drilled underneath the rocker tip. Mark all 8 rockers (total of 16 holes), take the assembly apart, remove the rockers from the shafts and drill them with a #38 drill bit, the hole towards the bottom, add the banana groove, de bur, berry hole and polish everything. Also now we can drill tap and plug that outer hole in the rocker arm with a set screw and loctite.
#5 for the final assemebly adjust everything side to side till the holes line up before you evenly tighten/torque the 5 hold down bolts. Set the valve lash cold with no lube, then take them all part and lube everything up, then double check the side to side clearance.
here are the items that i am going to buy:
rocker arm shaft side shim kit (i think i need to get two sets?):
Amazon.com: Mopar Performance P3690896 SPACER PACKAGE: Automotive
the locking adjusters:
Amazon.com: Crane 99802-16 Shaft Rocker Arm Adjusting Screw - Pack of 16: Automotive
This is the end mill im going to use at work to mill the top of the rocker arms for the locking adjuster nuts. I can use the threaded bore for the valve lash adjuster, to bolt it perfectly to the milling machine table, then bring the end mill down to the top and just touch it until it has removed enough metal to be true.:
https://www.amazon.com/gp/product/B004KA99PI/?tag=joeychgo-20
number #38 drill bit:
Century Drill and Tool 11438 Wire Gauge Drill Bit, NO 38 - Jobber Drill Bits - Amazon.com
blue dykem:
Dykem 80300 Steel Blue Layout Fluid, Brush-in-Cap (4oz): Amazon.com: Industrial & Scientific
Adjustable push rod for measuring the custom push rods:
https://www.amazon.com/gp/product/B001G9HWCI/?tag=joeychgo-20
Picture attached:
wow that was a keyboard full, howd i do?
